Contacts of the helix formed by residues 305 - 335 (chain A) in PDB entry 6J95


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PRO 305 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304A  SER*     1.4    89.2    -      -       -      +
    306A  ARG*     1.3    66.0    +      -       +      +
    308A  ARG*     3.2     6.0    +      -       +      +
    309A  LYS*     2.9    26.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 306 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  ARG*     5.1    16.5    +      -       -      +
    283A  GLU*     5.9     2.5    -      -       -      +
    304A  SER      3.6     1.1    -      -       -      +
    305A  PRO*     1.3    84.7    -      -       +      +
    307A  GLN*     1.3    59.8    +      -       -      +
    309A  LYS*     3.1     8.8    +      -       -      +
    310A  VAL*     2.9    34.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 307 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283A  GLU*     6.0     1.1    -      -       -      -
    304A  SER*     2.9    16.8    +      -       -      +
    305A  PRO      4.4     0.2    -      -       -      -
    306A  ARG*     1.3    78.0    -      -       -      +
    308A  ARG*     1.3    54.6    +      -       -      +
    310A  VAL*     3.6     9.8    +      -       -      +
    311A  ALA*     3.2    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 308 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304A  SER*     2.4    34.9    +      -       -      +
    305A  PRO*     3.5     7.4    -      -       +      +
    306A  ARG      3.1     0.2    -      -       -      -
    307A  GLN*     1.3    67.3    -      -       -      +
    309A  LYS*     1.3    59.6    +      -       -      +
    310A  VAL      3.2     1.8    -      -       -      -
    311A  ALA*     3.3     6.7    +      -       -      +
    312A  THR*     3.0    32.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 309 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  THR*     4.4    11.4    -      -       +      -
    282A  ARG*     5.7     1.3    -      -       -      +
    305A  PRO      2.9    14.2    +      -       -      +
    306A  ARG*     3.1    11.0    +      -       -      +
    308A  ARG*     1.3    75.7    -      -       -      +
    310A  VAL*     1.3    57.6    +      -       -      +
    312A  THR*     3.6     7.5    +      -       -      -
    313A  SER*     2.9    32.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 310 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  PHE*     4.4     9.9    -      -       +      -
    279A  THR*     4.4     8.5    -      -       +      +
    280A  VAL*     5.2     4.0    -      -       +      -
    282A  ARG*     4.2    13.9    -      -       -      +
    283A  GLU*     3.9    45.1    -      -       +      +
    287A  ARG*     5.6     2.5    -      -       -      +
    306A  ARG*     2.9    21.9    +      -       +      +
    307A  GLN*     3.7     9.4    -      -       -      +
    308A  ARG      3.2     0.2    -      -       -      -
    309A  LYS*     1.3    74.2    -      -       -      +
    311A  ALA*     1.3    59.2    -      -       -      +
    313A  SER*     3.1     4.0    +      -       -      -
    314A  LEU*     2.8    46.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 311 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307A  GLN      3.2    13.0    +      -       -      +
    308A  ARG*     3.3     9.4    +      -       -      +
    310A  VAL*     1.3    79.9    -      -       -      +
    312A  THR*     1.3    57.8    +      -       -      +
    314A  LEU*     3.5     9.8    +      -       -      +
    315A  LYS*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 312 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308A  ARG*     3.0    18.4    +      -       -      +
    309A  LYS*     3.8     8.1    -      -       -      +
    311A  ALA*     1.3    74.7    -      -       -      +
    313A  SER*     1.3    66.4    +      -       -      +
    315A  LYS*     3.2     7.6    +      -       -      +
    316A  LEU*     3.0    25.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 313 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    276A  ALA*     3.6    37.2    -      -       -      +
    279A  THR*     3.5    20.2    +      -       -      +
    280A  VAL*     4.0     6.1    -      -       -      -
    309A  LYS*     2.9    19.6    +      -       -      +
    310A  VAL      3.6     3.6    -      -       -      -
    312A  THR*     1.3    76.3    -      -       -      +
    314A  LEU*     1.3    62.8    +      -       -      +
    316A  LEU*     3.3     2.4    +      -       -      +
    317A  ILE*     3.1    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 314 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  PHE*     3.7    28.0    -      -       +      +
    184A  VAL*     4.1    23.6    -      -       +      +
    280A  VAL*     3.6    21.8    -      -       +      -
    310A  VAL*     2.8    36.2    +      -       +      +
    311A  ALA*     3.7     8.7    -      -       -      +
    313A  SER*     1.3    72.7    -      -       -      +
    315A  LYS*     1.3    57.9    +      -       -      +
    317A  ILE*     3.5     4.8    +      -       +      +
    318A  ASN*     3.0    44.1    +      -       -      +
    372A  MET*     5.4     7.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 315 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311A  ALA      3.0    18.1    +      -       -      +
    312A  THR*     3.2     7.8    +      -       -      +
    314A  LEU*     1.3    77.4    -      -       -      +
    316A  LEU*     1.3    56.9    +      -       -      +
    318A  ASN*     3.4     6.1    +      -       +      +
    319A  ASP*     2.8    65.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 316 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  GLY*     3.5    36.8    -      -       -      +
    273A  VAL*     3.8    14.4    -      -       +      +
    276A  ALA*     4.2     5.8    -      -       +      -
    312A  THR*     3.0    18.1    +      -       +      +
    313A  SER*     3.3     5.1    +      -       -      +
    315A  LYS*     1.3    77.0    -      -       -      +
    317A  ILE*     1.3    59.4    +      -       -      +
    319A  ASP*     3.4     9.5    +      -       +      +
    320A  THR*     2.8    42.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 317 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  PHE*     6.3     0.4    -      -       +      -
    264A  PHE*     6.4     1.1    -      -       +      -
    273A  VAL*     4.7     7.4    -      -       +      +
    276A  ALA*     3.7    35.9    -      -       +      +
    277A  VAL*     3.7    21.5    -      -       +      +
    280A  VAL*     4.0    15.0    -      -       +      -
    313A  SER      3.1    18.1    +      -       -      +
    314A  LEU*     4.0     4.5    -      -       +      +
    316A  LEU*     1.3    74.4    -      -       -      +
    318A  ASN*     1.3    58.1    -      -       -      +
    320A  THR*     3.2     7.7    +      -       -      -
    321A  LEU*     2.8    41.1    +      -       +      +
    372A  MET*     3.6    35.7    -      -       +      -
    375A  LEU*     5.0     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 318 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  LEU*     3.0    32.1    +      -       -      +
    315A  LYS*     3.8     6.6    -      -       +      +
    317A  ILE*     1.3    77.4    -      -       -      +
    319A  ASP*     1.3    58.4    +      -       -      +
    321A  LEU*     3.3     3.4    +      -       -      +
    322A  ASP*     2.8    35.0    +      -       -      +
    368A  ARG*     3.4    36.2    +      -       -      +
    369A  ASP*     5.5     1.4    -      -       -      +
    372A  MET*     3.7    20.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 319 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  LYS*     2.8    60.7    +      -       -      +
    316A  LEU*     3.7    10.0    -      -       +      +
    318A  ASN*     1.3    73.9    -      -       -      +
    320A  THR*     1.3    63.8    +      -       -      +
    322A  ASP*     3.2    13.7    +      -       -      +
    323A  ASP*     3.0    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 320 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  PHE*     6.2     0.7    -      -       +      -
    262A  TYR*     4.0    37.0    -      -       +      +
    264A  PHE*     6.2     0.2    -      -       +      -
    273A  VAL*     3.9    23.5    -      -       +      +
    316A  LEU*     2.8    30.6    +      -       -      +
    317A  ILE*     3.2     8.7    +      -       +      -
    319A  ASP*     1.3    75.7    -      -       -      +
    321A  LEU*     1.3    65.6    +      -       +      +
    323A  ASP*     3.2    14.3    +      -       +      +
    324A  LEU*     3.1    24.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 321 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  PHE*     3.7    47.3    -      -       +      -
    317A  ILE*     2.8    27.2    +      -       +      +
    318A  ASN*     3.7     6.1    -      -       -      +
    320A  THR*     1.3    74.1    -      -       +      +
    322A  ASP*     1.3    59.0    +      -       -      +
    324A  LEU*     3.1     9.2    +      -       +      +
    325A  ILE*     2.8    38.0    +      -       +      +
    368A  ARG*     4.1    32.8    -      -       +      +
    371A  LEU*     4.4    11.7    -      -       +      -
    372A  MET*     3.6    34.5    -      -       +      +
    375A  LEU*     6.2     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 322 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318A  ASN*     2.8    20.1    +      -       -      +
    319A  ASP*     3.2    18.4    +      -       -      +
    321A  LEU*     1.3    75.9    -      -       -      +
    323A  ASP*     1.3    63.8    +      -       -      +
    325A  ILE*     3.4     9.9    +      -       -      +
    326A  ALA*     3.0    24.8    +      -       -      +
    364A  SER*     4.8     4.9    +      -       -      -
    368A  ARG*     3.0    35.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 323 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319A  ASP*     3.0    20.0    +      -       -      +
    320A  THR*     3.2    10.2    +      -       -      +
    322A  ASP*     1.3    78.9    -      -       -      +
    324A  LEU*     1.3    58.5    +      -       +      +
    326A  ALA*     3.3     6.1    +      -       -      +
    327A  THR*     2.9    33.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 324 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  PHE*     3.6    50.7    -      -       +      +
    261A  ASN*     4.1    12.1    -      -       +      +
    262A  TYR*     3.8    30.7    -      -       +      -
    320A  THR*     3.1    18.2    +      -       +      +
    321A  LEU*     3.1    15.3    +      -       +      +
    323A  ASP*     1.3    77.0    -      -       +      +
    325A  ILE*     1.3    56.4    -      -       -      +
    327A  THR*     3.4     9.0    +      -       +      -
    328A  CYS*     2.8    31.4    +      -       -      +
    352A  LEU*     4.1     8.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  LEU      2.8    22.8    +      -       -      +
    322A  ASP*     3.8    11.2    -      -       -      +
    324A  LEU*     1.3    75.4    -      -       -      +
    326A  ALA*     1.3    59.0    +      -       -      +
    328A  CYS*     3.3     2.0    +      -       -      +
    329A  LYS*     2.9    56.5    +      -       -      +
    352A  LEU*     4.1    18.2    -      -       +      -
    356A  LEU*     4.4     3.6    -      -       +      -
    364A  SER*     5.0     9.9    -      -       -      +
    367A  LEU*     4.0    35.7    -      -       +      -
    368A  ARG*     3.9    27.6    -      -       +      -
    371A  LEU*     4.4     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  ASP      3.0    18.1    +      -       -      +
    323A  ASP*     3.7     6.3    -      -       -      +
    325A  ILE*     1.3    74.9    -      -       -      +
    327A  THR*     1.3    65.5    +      -       -      +
    329A  LYS*     3.3    10.2    +      -       -      +
    330A  ARG*     3.1    33.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323A  ASP*     2.9    19.6    +      -       -      +
    324A  LEU*     3.7     9.5    -      -       +      -
    326A  ALA*     1.3    74.5    -      -       -      +
    328A  CYS*     1.3    64.5    +      -       -      +
    330A  ARG*     3.3    33.2    +      -       -      +
    331A  MET*     3.0    23.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  LEU      2.8    18.7    +      -       -      +
    325A  ILE      3.8     0.2    -      -       -      +
    326A  ALA      3.2     0.2    -      -       -      -
    327A  THR*     1.3    77.6    -      -       -      +
    329A  LYS*     1.3    59.2    +      -       -      +
    331A  MET*     3.1     7.9    +      -       -      +
    332A  VAL*     2.8    35.2    +      -       -      +
    348A  ASP*     3.6     9.6    -      -       -      +
    352A  LEU*     4.2    10.3    -      -       +      -
    353A  HIS*     3.4    49.4    -      -       -      -
    356A  LEU*     3.6    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  ILE*     2.9    42.4    +      -       +      +
    326A  ALA*     3.3     8.0    +      -       -      +
    328A  CYS*     1.3    76.8    -      -       -      +
    330A  ARG*     1.3    56.4    +      -       -      +
    332A  VAL*     3.2     7.4    +      -       -      +
    333A  GLU*     2.8    30.5    +      -       -      +
    356A  LEU*     3.7    26.5    -      -       +      -
    364A  SER*     4.7    11.1    +      -       -      -
    367A  LEU*     5.6     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  ALA*     3.1    16.7    +      -       -      +
    327A  THR*     3.5    49.6    +      -       -      +
    329A  LYS*     1.3    75.5    -      -       -      +
    331A  MET*     1.3    62.0    +      -       -      +
    333A  GLU*     3.4     7.3    +      -       +      +
    334A  GLU*     3.2    47.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  ASN*     5.7     1.6    -      -       -      -
    327A  THR*     3.0    16.0    +      -       +      +
    328A  CYS*     3.4     9.6    -      -       -      +
    330A  ARG*     1.3    73.3    -      -       -      +
    332A  VAL*     1.3    65.3    +      -       -      +
    334A  GLU*     3.3     5.7    +      -       -      +
    335A  GLU*     3.0    24.9    +      -       +      +
    345A  ASN*     3.6    20.0    -      -       -      +
    347A  ARG*     3.6    32.1    -      -       +      +
    348A  ASP*     3.7    21.1    -      -       +      +
    353A  HIS*     3.6    19.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328A  CYS*     2.8    25.0    +      -       -      +
    329A  LYS*     3.6     6.5    -      -       -      +
    331A  MET*     1.3    71.9    -      -       -      +
    333A  GLU*     1.3    64.8    +      -       -      +
    334A  GLU      3.3     0.3    +      -       -      -
    335A  GLU*     3.3    26.7    +      -       -      +
    353A  HIS*     3.8    26.2    -      -       +      +
    356A  LEU*     4.1    27.6    -      -       +      +
    357A  ALA*     4.1    24.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  LYS      2.8    16.3    +      -       -      +
    330A  ARG*     3.8     7.6    -      -       -      +
    332A  VAL*     1.3    79.4    -      -       -      +
    334A  GLU*     1.3    62.6    +      -       +      +
    335A  GLU      3.8     3.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  ARG*     3.2    35.5    +      -       -      +
    331A  MET*     3.8     4.8    -      -       -      +
    332A  VAL      3.2     0.2    -      -       -      -
    333A  GLU*     1.3    79.2    -      -       +      +
    335A  GLU*     1.3    64.7    +      -       -      +
    336A  GLU*     4.1     8.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  MET*     3.0    12.2    +      -       +      +
    332A  VAL*     3.3    25.5    +      -       +      +
    333A  GLU      4.2     3.5    -      -       -      +
    334A  GLU*     1.3    81.5    -      -       -      +
    336A  GLU*     1.3    64.2    +      -       -      +
    337A  LEU*     3.8    19.8    +      -       +      +
    343A  TYR*     2.6    31.7    +      -       -      -
    345A  ASN*     2.7    35.2    +      -       -      +
    353A  HIS*     2.9    16.5    +      -       -      -
    357A  ALA*     4.2     5.7    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il