Contacts of the helix formed by residues 287 - 314 (chain E) in PDB entry 6C3P


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 ILE 287 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286E  ALA*     1.3    77.2    -      -       +      +
    288E  TRP*     1.3    69.4    +      -       +      +
    289E  GLN      3.1     2.2    -      -       -      -
    290E  ALA*     3.1    11.3    +      -       +      +
    291E  LEU*     2.9    27.1    +      -       +      +
    394E  LYS*     6.3     1.6    -      -       -      +
    607E  VAL*     3.6    30.5    -      -       +      -
    610E  LEU*     4.5    20.2    -      -       +      -
    611E  SER*     4.7    21.3    -      -       -      +
    614E  LEU*     5.7    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 288 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286E  ALA*     4.9    11.0    -      -       +      +
    287E  ILE*     1.3    79.6    -      -       +      +
    289E  GLN*     1.3    58.2    -      -       +      +
    291E  LEU*     3.6    14.3    -      -       +      +
    292E  SER*     2.9    33.5    +      -       -      -
    432E  PHE*     6.6     0.2    -      +       -      -
    603E  ALA      5.4     0.2    -      -       -      -
    604E  LEU*     3.5    47.3    -      -       +      -
    607E  VAL*     3.2    41.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 289 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272E  ALA*     5.4     3.8    -      -       +      -
    286E  ALA      3.6    30.3    +      -       -      +
    287E  ILE      3.1     0.8    -      -       -      -
    288E  TRP*     1.3    78.3    -      -       +      +
    290E  ALA*     1.3    58.9    +      -       -      +
    292E  SER*     2.6    22.0    +      -       -      -
    293E  HIS*     2.9    17.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 290 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268E  GLU*     4.5     2.5    -      -       -      +
    269E  ALA*     4.5    17.9    -      -       +      +
    272E  ALA*     4.3    20.8    -      -       +      +
    286E  ALA      4.1     1.5    +      -       -      +
    287E  ILE*     3.1    14.8    +      -       +      +
    289E  GLN*     1.3    75.5    -      -       -      +
    291E  LEU*     1.3    65.8    +      -       -      +
    293E  HIS*     3.7     6.5    -      -       -      +
    294E  ALA*     2.9    26.3    +      -       -      +
    394E  LYS*     6.0     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 291 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287E  ILE*     2.9    17.0    +      -       +      +
    288E  TRP*     3.6    19.3    -      -       +      +
    290E  ALA*     1.3    75.9    -      -       -      +
    292E  SER*     1.3    67.0    +      -       -      +
    294E  ALA*     3.0     6.3    +      -       -      +
    295E  PHE*     2.9    49.5    +      -       +      +
    299E  LEU*     5.2     2.7    -      -       +      -
    387E  LEU*     3.7    40.2    -      -       +      -
    391E  ILE*     5.8     1.6    -      -       +      -
    428E  LEU*     6.4     0.7    -      -       +      -
    432E  PHE*     4.1    23.3    -      -       +      -
    607E  VAL*     6.6     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 292 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288E  TRP      2.9    17.2    +      -       -      -
    289E  GLN*     2.6    26.2    +      -       -      -
    291E  LEU*     1.3    78.7    -      -       -      +
    293E  HIS*     1.3    63.3    +      -       -      +
    295E  PHE      2.9     0.2    +      -       -      -
    296E  GLY*     2.9    32.2    +      -       -      +
    299E  LEU*     6.4     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 293 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268E  GLU*     4.1    16.6    +      -       +      +
    271E  ASP*     3.7    28.0    -      -       +      +
    272E  ALA*     4.3    10.8    +      -       +      +
    275E  ARG*     6.4     1.1    -      -       +      -
    289E  GLN      2.9    15.9    +      -       -      +
    290E  ALA*     3.7     7.2    -      -       -      +
    292E  SER*     1.3    79.2    +      -       -      +
    294E  ALA*     1.3    59.7    +      -       -      +
    296E  GLY      5.1     0.3    +      -       -      -
    297E  ARG*     5.6     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 294 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264E  GLN*     4.8     7.9    -      -       +      +
    265E  ARG*     4.8     9.0    -      -       +      -
    268E  GLU*     3.4    24.9    -      -       +      +
    290E  ALA      2.9    18.0    +      -       -      +
    291E  LEU*     3.5     6.7    -      -       -      +
    293E  HIS*     1.3    77.2    -      -       -      +
    295E  PHE*     1.3    63.2    +      -       +      +
    297E  ARG*     5.6     4.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 295 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291E  LEU*     2.9    33.5    +      -       +      +
    292E  SER      2.9     0.4    +      -       -      -
    294E  ALA*     1.3    84.0    -      -       +      +
    296E  GLY*     1.3    65.8    +      -       -      +
    297E  ARG*     3.1     6.8    +      -       -      -
    298E  ARG*     3.5    23.0    +      -       +      +
    299E  LEU*     3.8    31.4    +      -       +      -
    383E  THR*     3.2    53.4    -      -       +      -
    386E  ASN*     4.6    13.5    -      -       +      -
    387E  LEU*     4.8    15.3    -      -       +      -
    432E  PHE*     4.9     7.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLY 296 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292E  SER*     2.9    20.4    +      -       -      -
    295E  PHE*     1.3    77.6    -      -       -      +
    297E  ARG*     1.3    57.3    +      -       -      +
    298E  ARG      3.3     0.2    -      -       -      -
    299E  LEU*     3.3    13.9    +      -       -      +
    300E  VAL*     2.9    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 297 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293E  HIS      5.6     3.6    +      -       -      -
    294E  ALA      5.6     5.1    +      -       -      +
    295E  PHE*     4.7     4.5    -      -       -      +
    296E  GLY*     1.3    77.5    -      -       -      +
    298E  ARG*     1.3    63.3    +      -       +      +
    300E  VAL*     3.1    13.3    -      -       +      +
    301E  LEU*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 298 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295E  PHE*     3.5    17.0    +      -       +      +
    296E  GLY      3.3     0.2    -      -       -      -
    297E  ARG*     1.3    85.2    -      -       +      +
    299E  LEU*     1.3    58.4    +      -       -      +
    301E  LEU*     3.2    11.7    +      -       +      +
    302E  SER*     3.0    23.9    +      -       -      -
    379E  VAL*     3.5    19.1    -      -       +      +
    382E  GLU*     3.1    35.5    +      -       -      -
    383E  THR*     3.4    24.9    -      -       +      +
    386E  ASN*     4.5     7.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 299 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291E  LEU*     5.2     3.4    -      -       +      -
    292E  SER*     6.4     0.7    -      -       -      -
    295E  PHE*     3.8    35.0    -      -       +      +
    296E  GLY*     3.3    13.3    +      -       -      +
    297E  ARG      3.3     0.6    -      -       -      -
    298E  ARG*     1.3    77.7    -      -       -      +
    300E  VAL*     1.3    60.3    +      -       +      +
    302E  SER*     3.2     6.2    +      -       -      -
    303E  SER*     2.8    32.4    +      -       -      +
    380E  ALA*     5.2     4.3    -      -       +      -
    383E  THR*     3.8    28.5    -      -       +      +
    432E  PHE*     4.0    16.2    -      -       +      +
    435E  CYS*     3.7    35.8    -      -       +      -
    436E  PRO*     4.8     1.7    -      -       +      +
    439E  TRP*     5.9     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 300 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296E  GLY*     2.9    23.0    +      -       -      +
    297E  ARG*     3.1    22.2    -      -       +      +
    299E  LEU*     1.3    77.8    -      -       +      +
    301E  LEU*     1.3    53.1    +      -       -      +
    303E  SER*     3.6     9.6    -      -       -      -
    304E  THR*     2.6    39.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 301 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297E  ARG      2.9    14.4    +      -       -      +
    298E  ARG*     3.3    13.5    -      -       +      +
    300E  VAL*     1.3    75.9    -      -       -      +
    302E  SER*     1.3    66.7    +      -       -      +
    304E  THR*     3.2     8.5    +      -       -      -
    305E  PHE*     3.0    59.7    +      -       +      -
    379E  VAL*     3.8    18.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 302 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298E  ARG      3.0     8.7    +      -       -      -
    299E  LEU*     3.6     9.2    -      -       -      -
    301E  LEU*     1.3    75.9    -      -       -      +
    303E  SER*     1.3    62.6    +      -       -      +
    305E  PHE*     3.2     8.7    +      -       -      +
    306E  ARG      3.0     7.1    +      -       -      -
    376E  SER*     2.1    54.8    +      -       -      -
    379E  VAL*     3.5    25.8    -      -       -      -
    380E  ALA*     3.5    16.8    +      -       -      +
    436E  PRO*     4.0     6.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 303 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299E  LEU*     2.8    21.5    +      -       -      +
    300E  VAL*     3.6    10.6    -      -       -      +
    302E  SER*     1.3    75.0    -      -       -      +
    304E  THR*     1.3    55.1    +      -       -      +
    306E  ARG*     2.6    26.3    +      -       -      +
    307E  ILE*     2.8    27.9    +      -       -      +
    435E  CYS*     5.7     0.5    -      -       -      -
    436E  PRO*     3.4    30.8    +      -       -      +
    439E  TRP*     4.6    15.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 304 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300E  VAL*     2.6    27.9    +      -       -      +
    301E  LEU*     3.5     8.1    -      -       -      -
    303E  SER*     1.3    71.4    -      -       -      +
    305E  PHE*     1.3    69.4    +      -       +      +
    307E  ILE*     3.9     9.9    -      -       +      +
    308E  LEU*     2.9    32.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 305 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301E  LEU*     3.0    47.6    +      -       +      -
    302E  SER*     3.2     7.4    -      -       -      +
    304E  THR*     1.3    81.8    -      -       +      +
    306E  ARG*     1.3    56.7    +      -       -      +
    308E  LEU*     3.9     5.3    -      -       +      +
    309E  ALA*     2.9    31.6    +      -       -      +
    372E  PHE*     4.0    10.9    -      +       +      +
    375E  ALA*     3.4    36.1    -      -       +      -
    376E  SER*     3.5    15.3    -      -       -      +
    379E  VAL*     3.7    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 306 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302E  SER      3.0     5.9    +      -       -      +
    303E  SER*     2.6    17.8    +      -       -      +
    305E  PHE*     1.3    72.7    -      -       -      +
    307E  ILE*     1.3    56.2    +      -       -      +
    309E  ALA*     3.4     3.3    +      -       -      +
    310E  ASP*     2.9    40.0    +      -       -      +
    373E  LEU*     3.9    23.2    +      -       -      +
    376E  SER*     2.9    34.2    +      -       -      +
    377E  TYR*     4.1    26.7    -      -       -      +
    433E  PHE      5.2     2.6    +      -       -      -
    436E  PRO*     3.8    17.0    -      -       +      +
    437E  ASN*     3.6    34.7    +      -       -      +
    440E  ALA*     3.5    24.9    -      -       +      -
    592E  LEU*     5.6     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 307 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303E  SER*     2.8    46.8    +      -       -      +
    304E  THR*     3.9    10.3    -      -       +      +
    306E  ARG*     1.3    70.1    -      -       -      +
    308E  LEU*     1.3    67.2    +      -       -      +
    310E  ASP*     2.5    22.7    -      -       -      +
    311E  LEU*     2.9    22.6    +      -       +      +
    439E  TRP*     4.6     4.7    -      -       +      +
    440E  ALA*     4.0    28.3    -      -       +      +
    443E  VAL*     4.2    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 308 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304E  THR*     2.9    24.1    +      -       +      +
    305E  PHE*     3.9     5.2    -      -       +      +
    307E  ILE*     1.3    77.8    -      -       -      +
    309E  ALA*     1.3    67.2    +      -       -      +
    311E  LEU*     3.8     6.0    -      -       -      +
    312E  LEU*     2.9    28.1    +      -       +      +
    372E  PHE*     3.6    34.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 309 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305E  PHE      2.9    19.8    +      -       -      +
    306E  ARG      3.5     4.3    -      -       -      +
    308E  LEU*     1.3    75.5    -      -       -      +
    310E  ASP*     1.3    58.0    +      -       -      +
    312E  LEU*     2.8    18.4    +      -       -      -
    369E  GLN*     2.2    52.0    +      -       -      +
    372E  PHE*     3.8    14.1    -      -       +      +
    373E  LEU*     3.6    18.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 310 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306E  ARG*     2.9    23.5    +      -       -      +
    307E  ILE*     2.5    34.1    -      -       -      +
    309E  ALA*     1.3    73.2    -      -       -      +
    311E  LEU*     1.3    62.7    +      -       -      +
    313E  GLY*     3.7     1.4    -      -       -      -
    314E  PHE*     2.8    28.8    +      -       -      +
    369E  GLN*     4.0     7.0    -      -       -      +
    373E  LEU*     5.4     2.9    -      -       +      -
    440E  ALA*     4.1    17.3    -      -       -      +
    443E  VAL*     6.0     0.5    -      -       -      +
    444E  GLN*     3.4    48.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 311 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307E  ILE*     2.9    25.6    +      -       +      +
    308E  LEU*     3.8     5.2    -      -       -      +
    310E  ASP*     1.3    81.8    +      -       -      +
    312E  LEU*     1.3    65.8    +      -       -      +
    314E  PHE*     3.1    21.8    -      -       +      +
    315E  ALA*     3.7     3.1    +      -       -      +
    443E  VAL*     6.1     4.7    -      -       +      -
    444E  GLN*     6.4     1.6    -      -       -      +
    447E  VAL*     3.6    40.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 312 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308E  LEU*     2.9    16.2    +      -       +      +
    309E  ALA      2.8    14.1    +      -       -      +
    311E  LEU*     1.3    67.1    -      -       -      +
    313E  GLY*     1.3    54.2    +      -       -      +
    314E  PHE      3.0     3.8    -      -       -      -
    315E  ALA*     2.6    42.1    +      -       +      +
    365E  ALA*     3.7    38.2    -      -       +      +
    368E  LEU*     4.0    22.9    -      -       +      -
    369E  GLN*     3.6     8.3    -      -       -      +
    372E  PHE*     4.8    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 313 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309E  ALA      2.9     2.6    +      -       -      -
    310E  ASP*     3.7     3.8    -      -       -      -
    312E  LEU*     1.3    70.1    -      -       -      +
    314E  PHE*     1.3    55.3    +      -       -      +
    315E  ALA      3.0     0.2    -      -       -      -
    316E  GLY*     2.9    23.2    +      -       -      -
    317E  PRO*     4.2     2.3    -      -       -      +
    365E  ALA*     5.8     2.5    -      -       -      -
    366E  LEU*     5.0    10.5    -      -       -      +
    369E  GLN*     2.8    38.6    -      -       -      +
    370E  ARG*     5.8     0.4    -      -       -      -
    585E  ILE*     4.9     9.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 314 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310E  ASP      2.8    15.5    +      -       -      +
    311E  LEU*     3.1    19.1    -      -       +      +
    312E  LEU      2.9     0.6    +      -       -      -
    313E  GLY*     1.3    72.1    -      -       -      +
    315E  ALA*     1.3    56.4    +      -       -      +
    316E  GLY      3.0     8.5    +      -       -      -
    317E  PRO*     3.3    15.0    -      -       +      +
    318E  LEU*     4.8     6.2    -      -       +      +
    444E  GLN*     5.0    14.1    -      -       +      -
    447E  VAL*     3.4    28.9    -      -       +      -
    448E  GLY*     3.3    35.0    -      -       -      -
    451E  LEU*     3.3    37.9    -      -       +      +
    582E  LEU*     4.0    23.3    -      -       +      +
    585E  ILE*     5.4    12.8    -      -       +      -
    586E  LEU*     6.1     3.4    -      -       +      -
----------------------------------------------------------
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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