Contacts of the helix formed by residues 313 - 344 (chain A) in PDB entry 3UMH


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 HIS 313 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A   CD      3.5     4.4    -      -       -      -
    314A  ALA*     1.3    64.0    +      -       -      +
    315A  HIS*     3.2     6.5    -      -       -      +
    316A  PHE*     3.2    16.2    +      -       +      +
    317A  GLN*     3.0    28.3    +      -       -      +
    382A  HIS*     3.6     9.8    -      +       +      -
    386A  VAL*     4.0    18.3    -      -       +      +
    428A  LYS*     3.8    27.7    +      -       -      -
    432A  HIS*     3.0    47.6    +      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 314 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  HIS*     1.3    77.0    -      -       -      +
    315A  HIS*     1.3    68.6    +      -       +      +
    317A  GLN*     4.1     8.6    -      -       -      +
    318A  LYS*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 315 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  HIS*     4.4     4.2    -      -       -      +
    314A  ALA*     1.3    81.7    -      -       +      +
    316A  PHE*     1.3    56.8    +      -       +      +
    318A  LYS*     3.6     7.5    +      -       +      +
    319A  ALA*     3.1    27.6    +      -       -      +
    385A  ARG*     4.7    24.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 316 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A   CD      4.6     2.0    -      -       -      -
    313A  HIS*     3.2    12.7    +      -       +      +
    314A  ALA      3.0     0.2    -      -       -      -
    315A  HIS*     1.3    77.4    -      -       +      +
    317A  GLN*     1.3    65.3    +      -       +      +
    318A  LYS      3.1     1.8    -      -       -      -
    319A  ALA*     3.2     4.7    +      -       -      +
    320A  LYS*     2.8    42.8    +      -       +      +
    378A  LEU*     3.8    29.6    -      -       +      -
    379A  VAL*     3.9    24.7    -      -       +      -
    382A  HIS*     3.5    61.5    -      +       +      +
    436A  HIS*     4.4    11.2    -      +       -      -
    601A  ACT      4.5    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 317 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  HIS      3.0    16.4    +      -       -      +
    314A  ALA*     4.1     7.7    -      -       -      +
    316A  PHE*     1.3    81.1    -      -       +      +
    318A  LYS*     1.3    57.0    +      -       -      +
    320A  LYS*     3.6    16.8    -      -       +      +
    321A  GLU*     3.0    33.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 318 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314A  ALA      2.9    18.5    +      -       -      +
    315A  HIS*     3.7     7.4    -      -       +      +
    317A  GLN*     1.3    76.8    -      -       -      +
    319A  ALA*     1.3    64.7    +      -       -      +
    321A  GLU*     3.3     5.6    +      -       -      +
    322A  ARG*     3.0    71.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 319 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315A  HIS      3.1    15.1    +      -       -      +
    316A  PHE*     3.2     5.1    +      -       -      +
    318A  LYS*     1.3    78.4    -      -       -      +
    320A  LYS*     1.3    57.7    +      -       -      +
    322A  ARG*     3.1     9.1    +      -       -      +
    323A  LEU*     2.8    32.1    +      -       -      +
    378A  LEU*     3.7    28.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 320 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    316A  PHE*     2.8    30.0    +      -       +      +
    317A  GLN*     3.6    18.4    -      -       +      +
    319A  ALA*     1.3    76.8    -      -       -      +
    321A  GLU*     1.3    74.7    +      -       -      +
    323A  LEU*     3.2     5.7    +      -       -      +
    324A  GLU*     3.1    27.9    +      -       +      +
    378A  LEU*     3.7    16.5    -      -       +      +
    601A  ACT      4.7    23.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 321 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  GLN*     3.0    23.5    +      -       +      +
    318A  LYS*     3.7     5.8    -      -       -      +
    320A  LYS*     1.3    91.8    -      -       -      +
    322A  ARG*     1.3    63.5    +      -       +      +
    324A  GLU*     3.3    27.8    +      -       -      +
    325A  ALA*     3.1    21.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 322 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318A  LYS*     3.0    63.1    +      -       +      +
    319A  ALA*     3.6     7.4    -      -       -      +
    321A  GLU*     1.3    74.3    -      -       +      +
    323A  LEU*     1.3    67.0    +      -       -      +
    325A  ALA*     3.3     7.5    +      -       +      +
    326A  LYS*     2.9    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 323 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319A  ALA      2.8    13.5    +      -       -      +
    320A  LYS*     3.4    10.1    -      -       -      +
    322A  ARG*     1.3    76.8    -      -       -      +
    324A  GLU*     1.3    62.5    +      -       -      +
    326A  LYS*     3.3    18.4    +      -       -      +
    327A  HIS*     3.0    23.8    +      -       -      +
    371A  ALA*     5.2     2.2    -      -       +      +
    374A  GLU*     3.0    40.7    -      -       +      +
    375A  ARG*     3.5    45.5    -      -       +      +
    378A  LEU*     4.0    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 324 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  LYS*     3.1    15.9    +      -       +      +
    321A  GLU*     3.4    31.1    -      -       -      +
    322A  ARG      3.1     0.2    -      -       -      -
    323A  LEU*     1.3    78.3    -      -       -      +
    325A  ALA*     1.3    59.6    +      -       -      +
    327A  HIS*     3.2     9.5    +      -       +      +
    328A  ARG*     2.8    49.1    +      -       +      +
    375A  ARG*     6.0     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  GLU      3.1    13.1    +      -       -      +
    322A  ARG*     3.7    10.8    -      -       +      +
    324A  GLU*     1.3    77.6    -      -       -      +
    326A  LYS*     1.3    62.6    +      -       -      +
    328A  ARG*     3.9     6.6    -      -       -      +
    329A  GLU*     3.0    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322A  ARG*     2.9    18.5    +      -       -      +
    323A  LEU*     3.4    22.0    -      -       -      +
    325A  ALA*     1.3    77.8    -      -       -      +
    327A  HIS*     1.3    64.0    +      -       -      +
    329A  GLU*     3.1     7.9    +      -       -      +
    330A  ARG*     2.9    32.0    +      -       -      +
    374A  GLU*     4.6    17.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5A   CD      2.2    28.3    -      -       -      -
    323A  LEU      3.0    13.2    +      -       -      +
    324A  GLU*     3.7     8.3    -      -       +      +
    326A  LYS*     1.3    79.5    -      -       -      +
    328A  ARG*     1.3    61.8    +      -       +      +
    330A  ARG*     3.2     6.8    +      -       -      +
    331A  MET*     2.8    51.2    +      -       +      +
    367A  LEU*     4.0    14.6    +      -       -      +
    368A  GLU*     3.0    23.8    +      -       -      -
    371A  ALA*     3.5    28.7    -      -       +      +
    374A  GLU*     6.1     0.9    -      -       -      +
    375A  ARG*     4.1    12.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  GLU*     2.8    39.4    +      -       +      +
    325A  ALA*     3.9     6.7    -      -       -      +
    327A  HIS*     1.3    78.8    -      -       +      +
    329A  GLU*     1.3    61.2    +      -       +      +
    331A  MET*     3.5     8.2    +      -       +      +
    332A  SER*     2.8    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325A  ALA*     3.0    29.4    +      -       +      +
    326A  LYS*     3.1     6.3    +      -       -      +
    328A  ARG*     1.3    75.8    -      -       +      +
    330A  ARG*     1.3    66.1    +      -       -      +
    332A  SER*     3.2    11.1    +      -       -      -
    333A  GLN*     3.1    33.8    +      -       -      +
    336A  ARG*     4.6     5.9    +      -       -      -
----------------------------------------------------------
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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  LYS*     2.9    23.9    +      -       -      +
    327A  HIS*     3.6     8.1    -      -       -      +
    329A  GLU*     1.3    77.2    -      -       -      +
    331A  MET*     1.3    62.1    +      -       -      +
    333A  GLN*     3.4    20.4    +      -       -      +
    334A  VAL*     3.2    26.7    +      -       -      +
    363A  LYS*     4.4    10.5    -      -       -      +
    367A  LEU*     3.1    26.7    -      -       +      +
    370A  GLU*     2.4    47.9    +      -       -      +
    374A  GLU*     4.9     3.0    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    327A  HIS*     2.8    46.2    +      -       +      +
    328A  ARG*     3.7    10.3    -      -       +      +
    329A  GLU      3.2     0.2    -      -       -      -
    330A  ARG*     1.3    76.3    -      -       -      +
    332A  SER*     1.3    59.9    +      -       -      +
    334A  VAL*     3.5     3.8    +      -       -      +
    335A  MET*     3.1    40.7    +      -       +      +
    364A  VAL*     4.0    30.5    -      -       +      -
    367A  LEU*     3.5    27.1    -      -       +      -
    368A  GLU*     3.4    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328A  ARG*     2.8    21.0    +      -       -      +
    329A  GLU*     3.4    14.8    +      -       -      -
    330A  ARG      3.1     0.6    -      -       -      -
    331A  MET*     1.3    74.6    -      -       -      +
    333A  GLN*     1.3    66.1    +      -       -      +
    335A  MET*     3.2     8.6    +      -       -      +
    336A  ARG*     3.1    40.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  GLU*     3.1    22.9    -      -       -      +
    330A  ARG*     3.4    20.7    +      -       -      +
    332A  SER*     1.3    75.8    -      -       -      +
    334A  VAL*     1.3    59.3    +      -       +      +
    336A  ARG*     3.3    35.9    +      -       -      +
    337A  GLU*     2.9    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  ARG      3.2     5.7    +      -       -      +
    331A  MET*     3.8     8.5    -      -       -      +
    332A  SER      3.1     0.6    -      -       -      -
    333A  GLN*     1.3    76.3    -      -       +      +
    335A  MET*     1.3    63.6    +      -       -      +
    337A  GLU*     3.4    10.1    +      -       -      +
    338A  TRP*     2.9    28.0    +      -       +      +
    360A  PHE*     3.8    18.4    -      -       +      -
    363A  LYS*     3.2    45.3    -      -       +      +
    364A  VAL*     4.0    26.7    -      -       +      -
    367A  LEU*     3.4    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  MET*     3.1    27.8    -      -       +      +
    332A  SER*     3.2     7.9    +      -       -      +
    334A  VAL*     1.3    78.9    -      -       -      +
    336A  ARG*     1.3    61.8    +      -       +      +
    338A  TRP*     3.5    37.8    -      -       +      +
    339A  GLU*     3.2    19.2    +      -       -      +
    364A  VAL*     4.7    13.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  GLU*     4.6     5.9    +      -       -      -
    332A  SER*     3.1    22.7    +      -       -      +
    333A  GLN*     3.4    48.5    +      -       -      +
    335A  MET*     1.3    74.5    -      -       -      +
    337A  GLU*     1.3    59.9    +      -       -      +
    338A  TRP      2.9     1.1    -      -       -      -
    339A  GLU*     2.6    35.1    +      -       -      +
    340A  GLU*     3.0    20.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  GLN*     2.9    15.7    +      -       -      +
    334A  VAL*     3.7    11.0    -      -       -      +
    336A  ARG*     1.3    79.7    -      -       -      +
    338A  TRP*     1.3    57.3    +      -       -      +
    340A  GLU*     3.5    12.4    +      -       -      +
    341A  ALA*     2.8    30.4    +      -       +      +
    359A  HIS*     4.9     6.4    +      -       -      -
    360A  PHE*     3.3    23.8    -      -       +      -
    363A  LYS*     5.5     7.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334A  VAL*     2.9    19.7    +      -       +      +
    335A  MET*     3.5    41.5    -      -       +      +
    337A  GLU*     1.3    74.0    -      -       -      +
    339A  GLU*     1.3    56.2    +      -       -      +
    341A  ALA*     3.0     2.4    +      -       -      +
    342A  GLU*     2.7    46.9    +      -       +      +
    356A  VAL*     4.5    12.0    -      -       +      +
    357A  ILE*     4.4    29.2    -      -       +      +
    360A  PHE*     3.3    52.4    -      +       +      +
    361A  GLN*     4.2    20.2    -      -       +      -
    364A  VAL*     4.7     8.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  MET      3.2     9.5    +      -       -      +
    336A  ARG*     2.6    22.2    +      -       -      +
    338A  TRP*     1.3    74.7    -      -       -      +
    340A  GLU*     1.3    67.7    +      -       +      +
    342A  GLU*     3.0    13.5    +      -       -      +
    343A  ARG*     2.9    58.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  ARG*     3.0    15.7    +      -       +      +
    337A  GLU*     3.8    13.4    -      -       -      +
    339A  GLU*     1.3    83.2    -      -       +      +
    341A  ALA*     1.3    53.9    +      -       -      +
    343A  ARG*     3.7     7.4    -      -       -      +
    344A  GLN*     2.6    43.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  GLU*     2.8    18.8    +      -       +      +
    338A  TRP      3.3     2.5    -      -       -      +
    340A  GLU*     1.3    77.6    -      -       -      +
    342A  GLU*     1.3    58.3    +      -       -      +
    344A  GLN*     3.6     5.0    -      -       -      +
    345A  ALA*     2.8    30.3    +      -       -      +
    356A  VAL*     4.0    10.0    -      -       +      +
    360A  PHE*     3.2    31.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  TRP*     2.7    24.4    +      -       +      +
    339A  GLU*     3.1    13.4    -      -       -      +
    341A  ALA*     1.3    77.4    -      -       -      +
    343A  ARG*     1.3    77.5    +      -       -      +
    345A  ALA*     3.1     6.5    +      -       -      +
    346A  LYS*     3.1    31.9    +      -       +      +
    353A  LYS*     5.4     1.7    -      -       -      -
    356A  VAL*     4.5    10.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  GLU*     2.9    53.1    +      -       -      +
    340A  GLU*     3.7     7.4    -      -       -      +
    342A  GLU*     1.3    82.9    +      -       +      +
    344A  GLN*     1.3    54.0    +      -       -      +
    345A  ALA      2.5    18.0    +      -       -      -
    346A  LYS*     2.9    52.6    +      -       +      +
    347A  ASN      4.7     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  GLU*     2.6    25.0    +      -       +      +
    341A  ALA*     3.6     5.2    -      -       -      +
    343A  ARG*     1.3    70.2    -      -       -      +
    345A  ALA*     1.3    58.9    +      -       -      +
    347A  ASN*     6.5     0.2    -      -       -      -
    348A  LEU*     4.3     4.9    -      -       -      +
----------------------------------------------------------
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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