Contacts of the helix formed by residues 293 - 317 (chain A) in PDB entry 3R29


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 293 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291A  GLU      3.9     4.7    -      -       -      +
    292A  LEU*     1.3    91.7    -      -       +      +
    294A  LEU*     1.3    65.5    +      -       -      +
    295A  ASP*     3.1     5.2    -      -       +      +
    296A  ASP*     3.0    27.2    +      -       -      +
    297A  GLN      3.2     8.0    +      -       -      -
    384A  SER*     4.0    19.1    -      -       -      +
    385A  ASN*     6.2     0.7    -      -       +      -
    388A  GLU*     3.7    17.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 294 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292A  LEU      3.1     4.5    +      -       -      -
    293A  PRO*     1.3    73.0    -      -       -      +
    295A  ASP*     1.3    68.0    +      -       -      +
    296A  ASP      3.3     0.7    +      -       -      -
    297A  GLN*     3.4    23.9    +      -       -      +
    298A  VAL*     3.4    22.7    +      -       +      +
   2346C  ARG*     3.6    38.1    -      -       +      +
   2349C  LEU*     4.8    13.7    -      -       +      -
   2350C  MET*     4.5    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 295 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293A  PRO*     3.1     4.3    -      -       +      +
    294A  LEU*     1.3    84.3    -      -       -      +
    296A  ASP*     1.3    65.1    +      -       -      +
    298A  VAL*     3.8    11.6    +      -       -      +
    299A  ILE*     3.6    19.2    +      -       -      +
    384A  SER*     6.3     0.9    -      -       -      -
   2342C  GLU*     6.0     0.6    -      -       -      -
   2346C  ARG*     3.2    35.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 296 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292A  LEU*     4.4    19.6    -      -       +      +
    293A  PRO*     3.0    24.3    +      -       -      +
    295A  ASP*     1.3    77.3    -      -       -      +
    297A  GLN*     1.3    69.6    +      -       -      +
    298A  VAL      3.0     1.1    -      -       -      -
    299A  ILE*     2.7    18.9    +      -       -      +
    300A  LEU*     3.0    17.1    +      -       +      +
    382A  GLY      5.0     0.7    -      -       -      +
    383A  LEU*     4.2    19.1    -      -       +      +
    384A  SER*     3.1    46.3    +      -       -      -
    385A  ASN*     3.9    10.2    +      -       -      +
    388A  GLU*     5.3     0.5    -      -       -      +
    389A  VAL*     4.9     2.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 297 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284A  LYS*     5.7     1.0    +      -       -      +
    289A  PHE*     3.5    44.1    -      -       +      +
    290A  SER*     2.8    30.1    +      -       -      +
    292A  LEU*     2.7    32.4    +      -       +      +
    293A  PRO      3.6     1.3    -      -       -      +
    294A  LEU*     3.4    22.7    -      -       -      +
    296A  ASP*     1.3    77.2    -      -       -      +
    298A  VAL*     1.3    65.4    +      -       -      +
    300A  LEU*     3.4     3.2    +      -       -      +
    301A  LEU*     3.3    26.8    +      -       -      +
   2349C  LEU*     3.2    29.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 298 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294A  LEU*     3.4    16.0    +      -       +      +
    295A  ASP*     3.9    10.5    -      -       -      +
    296A  ASP      2.9     2.6    +      -       -      -
    297A  GLN*     1.3    76.9    -      -       +      +
    299A  ILE*     1.3    59.5    +      -       +      +
    301A  LEU*     3.4     2.3    +      -       -      +
    302A  ARG*     2.8    40.0    +      -       +      +
   2342C  GLU*     4.3    27.6    -      -       +      -
   2345C  ILE*     4.2    33.8    -      -       +      +
   2346C  ARG*     4.3    28.9    -      -       +      +
   2349C  LEU*     5.2     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 299 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295A  ASP      3.6    16.8    -      -       -      +
    296A  ASP*     2.7    13.3    +      -       -      +
    298A  VAL*     1.3    70.1    -      -       +      +
    300A  LEU*     1.3    67.6    +      -       -      +
    302A  ARG*     3.0    23.3    +      -       -      +
    303A  ALA*     2.7    27.3    +      -       +      +
    380A  SER*     3.4    30.5    -      -       -      -
    381A  LYS      3.5    13.5    -      -       -      +
    382A  GLY*     3.4    36.1    -      -       -      +
    383A  LEU*     3.7    13.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 300 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289A  PHE*     4.1    13.2    -      -       +      -
    292A  LEU*     3.7    29.6    -      -       +      -
    296A  ASP*     3.0    15.2    +      -       +      +
    297A  GLN      4.0     4.3    -      -       -      +
    299A  ILE*     1.3    74.7    -      -       -      +
    301A  LEU*     1.3    59.2    +      -       -      +
    303A  ALA*     3.0     5.2    +      -       -      +
    304A  GLY*     2.8    27.5    +      -       -      -
    375A  LEU*     3.7    35.5    -      -       +      +
    376A  PHE*     4.2    10.5    -      -       +      -
    377A  ASN*     3.5    27.1    -      -       -      +
    380A  SER*     3.7     6.1    -      -       -      +
    383A  LEU*     4.0    16.4    -      -       +      -
    389A  VAL*     4.2    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 301 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  LEU*     4.3    21.6    -      -       +      +
    280A  VAL*     3.7    27.8    -      -       +      -
    282A  TRP*     5.6     0.2    -      -       +      -
    283A  ALA*     3.7    26.7    -      -       +      -
    289A  PHE*     4.1    12.1    -      -       +      -
    297A  GLN      3.3    16.7    +      -       -      +
    298A  VAL      3.7     3.1    -      -       -      +
    299A  ILE      3.2     0.6    -      -       -      -
    300A  LEU*     1.3    74.0    -      -       -      +
    302A  ARG*     1.3    67.8    +      -       -      +
    304A  GLY*     4.4     0.9    -      -       -      +
    305A  TRP*     2.9    36.7    +      -       +      +
    308A  LEU*     5.1     6.5    -      -       +      +
    375A  LEU*     4.3    10.7    -      -       +      +
   2345C  ILE*     4.0    23.3    -      -       +      -
   2349C  LEU*     4.7     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 302 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298A  VAL*     2.8    39.5    +      -       +      +
    299A  ILE*     3.4    22.8    -      -       -      +
    301A  LEU*     1.3    75.0    -      -       -      +
    303A  ALA*     1.3    62.7    -      -       -      +
    305A  TRP*     3.7    15.4    +      -       -      +
   2337C  THR*     3.2    35.3    +      -       -      +
   2339C  MET*     4.8     7.5    -      -       -      +
   2341C  LEU*     5.0    13.9    -      -       +      +
   2342C  GLU*     4.6    16.4    +      -       -      +
   2345C  ILE*     4.7    16.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 303 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299A  ILE*     2.7    22.4    +      -       +      +
    300A  LEU*     3.2     4.3    -      -       -      +
    302A  ARG*     1.3    77.2    -      -       -      +
    304A  GLY*     1.3    60.1    +      -       -      +
    305A  TRP      3.6     0.3    +      -       -      -
    306A  ASN*     4.9     3.1    +      -       -      +
    307A  GLU*     5.4     3.3    -      -       -      +
    377A  ASN*     5.3     9.6    -      -       +      +
    380A  SER*     3.8    27.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 304 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300A  LEU      2.8    17.8    +      -       -      -
    301A  LEU      3.7     0.7    -      -       -      -
    303A  ALA*     1.3    72.0    -      -       -      +
    305A  TRP*     1.3    68.8    +      -       -      +
    306A  ASN      2.9     4.0    +      -       -      -
    307A  GLU*     3.1     8.2    +      -       -      +
    308A  LEU*     3.0    35.4    +      -       -      +
    374A  VAL*     4.8    15.9    -      -       -      -
    375A  LEU*     5.7     0.9    -      -       -      -
    377A  ASN*     6.3     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 305 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272A  ALA*     4.4    12.3    -      -       +      -
    275A  GLN*     4.4     6.1    -      -       +      -
    276A  LEU*     3.6    49.8    -      -       +      -
    279A  LEU*     3.3    29.7    -      -       +      +
    280A  VAL*     5.9     1.8    -      -       +      -
    301A  LEU*     2.9    23.7    +      -       +      +
    302A  ARG*     3.7    12.3    -      -       -      +
    303A  ALA      3.3     1.8    -      -       -      -
    304A  GLY*     1.3    77.6    -      -       -      +
    306A  ASN*     1.3    70.0    -      -       -      +
    308A  LEU*     3.7     2.5    -      -       -      +
    309A  LEU*     3.0    49.9    +      -       +      +
   2341C  LEU*     5.9     5.6    -      -       +      -
   2345C  ILE*     4.8    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 306 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303A  ALA      4.9     3.0    +      -       -      +
    304A  GLY      2.9     3.6    +      -       -      -
    305A  TRP*     1.3    82.2    -      -       -      +
    307A  GLU*     1.3    71.3    +      -       +      +
    309A  LEU*     3.0     8.5    +      -       -      +
    310A  ILE*     3.0    29.7    +      -       -      +
    429A  GLY*     2.8    40.8    +      -       -      -
    432A  CYS*     4.2     9.3    -      -       -      +
    433A  LEU*     4.2    21.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 307 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303A  ALA      5.4     3.5    -      -       -      +
    304A  GLY*     3.1     6.6    +      -       -      +
    306A  ASN*     1.3    82.4    -      -       +      +
    308A  LEU*     1.3    54.0    +      -       -      +
    310A  ILE*     3.3     9.6    +      -       -      +
    311A  ALA*     2.7    36.7    +      -       -      +
    374A  VAL*     3.5    31.5    -      -       +      +
    377A  ASN*     5.3     2.9    +      -       -      -
    422A  LEU*     4.9     1.9    -      -       -      +
    425A  LEU*     3.6    35.6    -      -       +      +
    426A  ARG*     2.9    53.6    +      -       -      +
    429A  GLY*     5.0     4.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 308 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  LEU*     3.6    25.6    -      -       +      -
    282A  TRP*     3.5    31.0    -      -       +      -
    301A  LEU*     5.1     7.4    -      -       +      +
    304A  GLY*     3.0    32.1    +      -       -      +
    305A  TRP      3.7     0.7    -      -       -      +
    307A  GLU*     1.3    78.1    -      -       -      +
    309A  LEU*     1.3    61.9    +      -       -      +
    311A  ALA*     3.4     4.1    +      -       +      +
    312A  SER*     3.3    17.7    +      -       -      -
    371A  ARG*     3.4    55.9    +      -       +      +
    374A  VAL*     4.5     9.6    -      -       +      -
    375A  LEU*     4.6    15.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 309 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275A  GLN*     3.4    48.2    -      -       +      +
    278A  THR*     6.0     0.2    -      -       +      -
    279A  LEU*     4.0    19.5    -      -       +      -
    305A  TRP*     3.0    48.2    +      -       +      +
    306A  ASN*     3.0     8.9    +      -       -      +
    308A  LEU*     1.3    76.1    -      -       -      +
    310A  ILE*     1.3    66.7    +      -       +      +
    312A  SER*     3.0    16.6    +      -       -      -
    313A  PHE*     3.2    22.9    +      -       +      +
    316A  ARG*     5.0     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 310 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306A  ASN*     3.0    24.1    +      -       -      +
    307A  GLU*     3.5     8.3    -      -       -      +
    309A  LEU*     1.3    73.6    -      -       +      +
    311A  ALA*     1.3    60.0    +      -       -      +
    313A  PHE*     3.7    27.4    -      -       +      -
    314A  SER*     2.3    42.5    +      -       -      +
    349A  VAL*     5.1     0.7    -      -       +      -
    353A  LEU*     4.0     9.9    -      -       +      -
    425A  LEU*     3.7    17.3    -      -       +      +
    428A  ILE*     4.0    16.2    -      -       +      -
    429A  GLY*     3.6    35.0    -      -       -      +
    432A  CYS*     4.2    14.1    -      -       -      -
----------------------------------------------------------
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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  GLU      2.7    17.5    +      -       -      +
    308A  LEU*     3.7     7.0    -      -       +      +
    309A  LEU      3.2     0.2    -      -       -      -
    310A  ILE*     1.3    77.5    -      -       -      +
    312A  SER*     1.3    63.5    +      -       -      +
    314A  SER*     3.8     5.4    -      -       -      -
    315A  HIS*     3.4    12.5    +      -       -      +
    357A  MET*     4.5     5.4    -      -       +      +
    367A  LEU*     3.6    21.1    -      -       +      +
    371A  ARG*     4.0    21.8    -      -       +      -
    374A  VAL*     6.1     0.9    -      -       +      -
    425A  LEU*     4.1    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 312 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    239A  GLU*     5.0     2.9    +      -       -      -
    242A  VAL*     6.1     0.7    -      -       -      +
    278A  THR*     6.1     1.2    -      -       -      +
    308A  LEU      3.3     3.0    +      -       -      -
    309A  LEU*     3.0    12.9    +      -       -      -
    311A  ALA*     1.3    76.6    -      -       -      +
    313A  PHE*     1.3    67.6    +      -       -      +
    315A  HIS*     3.1     7.4    +      -       -      +
    316A  ARG*     2.9    39.1    +      -       -      +
    367A  LEU*     5.2     3.4    -      -       -      -
    371A  ARG*     3.3    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 313 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  ILE*     5.8     7.4    -      -       +      -
    309A  LEU*     3.2    20.8    +      -       +      -
    310A  ILE*     3.7    34.8    -      -       +      -
    312A  SER*     1.3    79.4    -      -       -      +
    314A  SER*     1.3    67.2    +      -       -      +
    316A  ARG*     3.5    19.1    -      -       -      +
    317A  SER*     2.8    28.1    +      -       -      -
    324A  ILE*     3.7    21.1    -      -       +      -
    325A  LEU      3.3    17.0    -      -       -      +
    326A  LEU*     4.1    19.1    -      -       +      -
    327A  ALA      5.0     0.7    -      -       -      +
    345A  ILE*     6.4     0.7    -      -       +      -
    349A  VAL*     3.8    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 314 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310A  ILE*     2.3    30.3    +      -       -      +
    311A  ALA*     3.8     1.1    -      -       -      -
    313A  PHE*     1.3    89.8    -      -       -      +
    315A  HIS*     1.3    64.4    +      -       -      +
    317A  SER*     3.3     9.0    +      -       -      -
    318A  ILE*     3.7    10.0    +      -       -      +
    349A  VAL*     4.1     1.4    -      -       -      +
    353A  LEU*     3.8    17.0    -      -       -      +
    354A  VAL*     3.9    26.7    -      -       -      +
    357A  MET*     3.8    24.7    -      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    311A  ALA      3.4     5.6    +      -       -      +
    312A  SER      3.1     8.1    +      -       -      +
    314A  SER*     1.3    79.3    -      -       -      +
    316A  ARG*     1.3    68.3    +      -       -      +
    318A  ILE*     2.9    48.7    +      -       +      +
    357A  MET*     3.9     9.6    -      -       -      -
    362A  MET*     3.3    39.3    +      -       +      -
    363A  ASP*     4.3     4.0    -      -       -      -
    364A  LYS*     4.3    29.6    -      -       +      -
    367A  LEU*     3.6    36.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 316 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243A  GLU*     6.6     0.4    -      -       +      -
    244A  PRO*     3.8    28.5    -      -       -      +
    275A  GLN*     5.7     1.2    -      -       -      +
    309A  LEU      5.0     0.6    +      -       -      -
    312A  SER*     2.9    24.1    +      -       -      +
    313A  PHE*     3.5    28.5    -      -       -      +
    314A  SER      3.1     0.2    -      -       -      -
    315A  HIS*     1.3    82.6    -      -       -      +
    317A  SER*     1.3    54.9    +      -       -      +
    318A  ILE*     3.1     4.5    +      -       -      +
    319A  ALA*     3.6    16.6    +      -       -      +
    325A  LEU*     3.0    47.3    +      -       +      +
    326A  LEU      3.1     1.9    -      -       -      -
    327A  ALA*     2.9    45.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 317 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  PHE      2.8    17.0    +      -       -      -
    314A  SER      3.8     6.3    -      -       -      -
    315A  HIS      3.1     0.8    -      -       -      -
    316A  ARG*     1.3    72.9    -      -       -      +
    318A  ILE*     1.3    59.9    +      -       -      +
    319A  ALA      3.0     6.1    -      -       -      +
    320A  VAL*     3.2    30.5    +      -       -      +
    323A  GLY      3.8     7.3    -      -       -      +
    324A  ILE*     3.3    14.9    -      -       -      +
    325A  LEU*     2.6    31.5    +      -       -      +
    354A  VAL*     3.7    16.2    -      -       -      +
    358A  ARG*     4.0     0.5    +      -       -      -
----------------------------------------------------------
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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