Contacts of the helix formed by residues 669 - 692 (chain A) in PDB entry 1JB0


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 LEU 669 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138A  GLN*     6.1     1.8    -      -       +      -
    660A  GLN*     6.1     0.9    -      -       +      -
    664A  SER*     3.0    23.2    +      -       -      -
    667A  SER*     3.1    11.2    +      -       -      +
    668A  ALA*     1.3    83.6    -      -       +      +
    670A  SER*     1.3    55.7    +      -       -      +
    671A  ALA      3.0     6.3    -      -       -      -
    672A  TYR*     2.9    51.5    +      -       +      +
    749A  ALA*     4.2    22.2    -      -       +      +
    752A  ILE*     4.1    28.3    -      -       +      -
    753A  SER*     4.2    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 670 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  ILE*     4.4     0.2    -      -       -      +
    126A  LEU*     3.8    10.6    -      -       -      +
    664A  SER*     3.2    26.5    +      -       -      -
    665A  TYR*     3.9     6.9    -      -       -      +
    667A  SER      3.0    15.1    +      -       -      -
    668A  ALA      3.2     0.2    -      -       -      -
    669A  LEU*     1.3    78.8    -      -       -      +
    671A  ALA*     1.3    63.3    +      -       -      +
    673A  GLY*     3.3     1.5    +      -       -      -
    674A  LEU*     3.0    27.4    +      -       -      +
    448B  ALA*     3.4    28.2    +      -       -      -
    449B  PHE*     3.8    12.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 671 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  LEU*     3.6    23.2    -      -       +      +
    668A  ALA      4.8     0.4    -      -       -      +
    669A  LEU      3.0     1.2    -      -       -      +
    670A  SER*     1.3    81.6    +      -       -      +
    672A  TYR*     1.3    56.9    +      -       -      +
    674A  LEU*     3.3     4.6    +      -       -      +
    675A  LEU*     2.8    34.2    +      -       -      +
   1106A  CLA      3.6    32.5    -      -       +      -
   1107A  CLA      4.0    24.3    -      -       +      +
    449B  PHE*     5.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 672 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  ILE*     4.9     0.5    -      -       -      +
    138A  GLN      4.4     2.1    +      -       -      -
    661A  VAL*     3.7     2.7    -      -       -      -
    669A  LEU*     2.9    41.1    +      -       +      +
    671A  ALA*     1.3    75.2    -      -       -      +
    673A  GLY*     1.3    56.8    +      -       -      +
    675A  LEU*     3.2     1.7    +      -       -      +
    676A  PHE*     2.7    36.4    +      -       -      +
    744A  TRP*     3.6    27.8    -      +       -      -
    745A  ALA*     3.4    22.4    -      -       +      +
    748A  LEU*     3.4    35.4    -      -       +      +
    749A  ALA*     3.9    24.5    -      -       +      -
    752A  ILE*     4.2    11.6    -      -       +      +
   1106A  CLA      3.5    51.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 673 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661A  VAL*     3.3    28.5    -      -       -      +
    664A  SER*     3.2    14.1    +      -       -      -
    665A  TYR*     4.1     4.9    -      -       -      -
    670A  SER      3.3     3.2    +      -       -      -
    672A  TYR*     1.3    77.9    -      -       -      +
    674A  LEU*     1.3    59.9    +      -       -      +
    676A  PHE*     3.3     9.7    -      -       -      +
    677A  LEU*     3.5     6.1    +      -       -      +
    623B  MET*     3.2    26.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 674 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    665A  TYR*     3.4    25.1    -      -       +      +
    670A  SER      3.0    17.9    +      -       -      +
    671A  ALA*     3.5     6.5    -      -       -      +
    673A  GLY*     1.3    72.8    -      -       -      +
    675A  LEU*     1.3    61.2    +      -       -      +
    676A  PHE      3.1     1.3    -      -       -      -
    677A  LEU*     3.2     3.9    +      -       -      +
    678A  GLY      2.9    22.2    +      -       -      -
   1107A  CLA      4.0    36.6    -      -       +      -
    444B  ASP      3.9    13.0    -      -       -      +
    445B  VAL*     4.0     9.9    -      -       +      +
    448B  ALA*     3.9    20.6    -      -       +      -
    449B  PHE*     4.2    10.3    -      -       +      -
   1012B  CLA      3.1    36.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 675 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671A  ALA      2.8    22.4    +      -       -      +
    672A  TYR*     3.9     2.5    -      -       -      +
    674A  LEU*     1.3    71.5    -      -       -      +
    676A  PHE*     1.3    56.5    +      -       -      +
    678A  GLY*     4.2     1.3    -      -       -      +
    679A  ALA*     2.7    37.9    +      -       -      +
    741A  ALA*     5.3     1.7    -      -       +      +
    744A  TRP*     3.7    34.1    -      -       +      -
    745A  ALA*     4.3     3.8    -      -       +      -
   1106A  CLA      3.9    13.5    -      -       +      -
   1107A  CLA      4.3     2.0    -      -       +      -
   1126A  CLA      3.5    43.3    -      -       +      -
   4011A  BCR      4.8    26.0    -      -       +      +
   1012B  CLA      3.8    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 676 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    658A  ALA*     4.9     1.1    -      -       +      -
    661A  VAL*     3.7    31.6    -      -       +      -
    662A  ILE*     3.9    10.3    -      -       +      -
    672A  TYR      2.7    21.7    +      -       -      +
    673A  GLY      3.3     6.5    -      -       -      +
    675A  LEU*     1.3    72.5    -      -       -      +
    677A  LEU*     1.3    61.5    +      -       +      +
    679A  ALA*     3.9     4.3    -      -       -      +
    680A  HIS*     2.9    45.5    +      +       -      -
    742A  THR*     3.6    31.9    -      -       +      -
    745A  ALA*     3.6    10.0    -      -       +      +
    746A  PHE*     3.8    19.5    -      -       +      -
   1011A  CLA      3.7    26.7    -      +       +      -
    623B  MET*     4.6     5.2    -      -       +      -
    626B  LEU*     3.9    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 677 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    665A  TYR*     3.7    11.2    -      -       -      +
    673A  GLY      3.5     8.9    +      -       -      +
    674A  LEU      3.2     8.3    +      -       -      +
    676A  PHE*     1.3    77.8    -      -       +      +
    678A  GLY*     1.3    67.3    +      -       -      +
    680A  HIS*     3.2     3.3    +      -       +      -
    681A  PHE*     3.0    18.7    +      -       -      +
    444B  ASP*     3.8     3.1    -      -       -      +
    622B  LEU*     4.1     2.0    -      -       +      +
    623B  MET*     3.5    43.1    -      -       +      +
    626B  LEU*     3.6    35.7    -      -       +      -
   1012B  CLA      3.3    56.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 678 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674A  LEU      2.9    13.2    +      -       -      -
    675A  LEU*     3.1     5.6    +      -       -      -
    677A  LEU*     1.3    77.0    -      -       -      +
    679A  ALA*     1.3    55.9    +      -       -      +
    681A  PHE*     3.1     6.4    +      -       -      +
    682A  ILE*     3.0    23.6    +      -       -      +
   4011A  BCR      3.6    28.5    -      -       -      +
   1012B  CLA      3.5    19.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 679 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    675A  LEU      2.7    18.6    +      -       -      +
    676A  PHE      3.9     0.7    -      -       -      +
    678A  GLY*     1.3    70.7    -      -       -      +
    680A  HIS*     1.3    64.1    +      -       -      +
    682A  ILE*     3.3     1.4    +      -       -      +
    683A  TRP*     3.0    20.4    +      -       -      +
    738A  GLY*     3.2    17.1    -      -       -      +
    741A  ALA*     3.4    15.0    -      -       +      -
    742A  THR*     2.9    42.2    -      -       -      +
   4011A  BCR      4.0     8.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 680 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676A  PHE*     2.9    46.1    +      +       -      +
    677A  LEU*     3.2    12.1    +      -       +      +
    679A  ALA*     1.3    76.0    -      -       -      +
    681A  PHE*     1.3    62.0    +      -       -      +
    683A  TRP*     3.4     2.4    +      -       -      +
    684A  ALA*     3.1    18.0    +      -       -      +
    742A  THR*     3.1    31.4    +      -       +      +
   1011A  CLA      2.3    66.8    +      +       +      -
    626B  LEU*     5.4     2.8    -      -       +      +
   1012B  CLA      2.9    45.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 681 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    677A  LEU      3.0     6.0    +      -       -      +
    678A  GLY      3.2     9.6    -      -       -      +
    679A  ALA      3.1     0.2    -      -       -      -
    680A  HIS*     1.3    75.5    -      -       -      +
    682A  ILE*     1.3    67.4    +      -       +      +
    684A  ALA*     3.2     4.8    +      -       -      +
    685A  PHE*     2.9    40.9    +      +       +      +
   1013A  CLA      3.5    45.2    -      -       +      +
   1140A  CLA      4.7    11.4    -      -       +      -
   4011A  BCR      3.3    32.3    -      -       +      -
    437B  LEU*     3.9    20.4    -      -       +      -
   1012B  CLA      3.4    62.3    -      +       +      +
----------------------------------------------------------
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Residues in contact with ILE 682 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678A  GLY      3.0    11.3    +      -       -      +
    679A  ALA      3.3     4.7    +      -       -      +
    681A  PHE*     1.3    86.4    -      -       +      +
    683A  TRP*     1.3    61.2    +      -       -      +
    685A  PHE*     3.3     9.5    -      -       +      +
    686A  SER      3.1    17.8    +      -       -      -
    734A  HIS*     3.3    40.9    -      -       +      +
    737A  LEU*     4.1     9.4    -      -       +      -
    738A  GLY*     3.8    11.0    -      -       -      +
   1140A  CLA      3.3    42.2    -      -       +      -
   4011A  BCR      3.4    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 683 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679A  ALA      3.0    17.2    +      -       -      +
    680A  HIS      3.5     3.1    -      -       -      +
    681A  PHE      3.1     0.2    -      -       -      -
    682A  ILE*     1.3    77.7    -      -       -      +
    684A  ALA*     1.3    73.2    +      -       -      +
    686A  SER*     2.7    23.1    +      -       -      -
    687A  LEU*     3.7     7.7    -      -       +      +
    734A  HIS      3.9     8.1    -      -       -      -
    735A  TYR*     3.1    62.5    -      +       -      -
    738A  GLY*     3.9     4.9    -      -       -      -
    739A  GLY*     3.9     6.3    -      -       -      -
   1011A  CLA      3.2    60.4    -      +       +      +
   1022A  CLA      3.6    13.2    -      -       +      -
    663B  TRP*     3.7    22.9    -      +       -      -
    667B  PHE*     3.8    10.8    -      +       -      -
   1012B  CLA      3.6    35.9    -      -       +      -
   1021B  CLA      4.5     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 684 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680A  HIS      3.1    11.6    +      -       -      +
    681A  PHE      3.8     1.1    -      -       -      +
    683A  TRP*     1.3    80.9    -      -       -      +
    685A  PHE*     1.3    66.6    +      -       -      +
    687A  LEU*     3.0    24.4    +      -       -      +
    688A  MET      3.9     1.7    +      -       -      -
   1013A  CLA      3.4    21.3    -      -       +      +
   1012B  CLA      3.4    50.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 685 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    681A  PHE*     2.9    27.1    +      +       +      +
    682A  ILE*     3.3     9.2    -      -       +      +
    684A  ALA*     1.3    79.2    -      -       -      +
    686A  SER*     1.3    61.6    +      -       -      +
    688A  MET*     3.1    39.8    +      -       +      +
    689A  PHE*     3.6    22.1    -      +       -      -
    734A  HIS*     3.3    35.4    -      +       -      -
   1013A  CLA      3.3    47.1    -      +       +      +
   1140A  CLA      3.5    55.0    -      +       +      -
----------------------------------------------------------
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Residues in contact with SER 686 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    682A  ILE      3.1     6.1    +      -       -      -
    683A  TRP      2.7    19.4    +      -       -      -
    685A  PHE*     1.3    77.7    -      -       -      +
    687A  LEU*     1.3    61.4    +      -       -      +
    689A  PHE*     3.1    20.9    +      -       -      +
    690A  LEU*     3.1    15.6    +      -       -      +
    731A  GLY      3.1    24.2    -      -       -      -
    734A  HIS*     3.2    22.9    -      -       -      -
    735A  TYR*     3.3    25.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 687 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    683A  TRP*     3.7    14.1    -      -       +      +
    684A  ALA*     3.0    16.3    +      -       -      +
    686A  SER*     1.3    78.6    +      -       -      +
    688A  MET*     1.3    56.3    +      -       -      +
    690A  LEU*     3.8     6.3    -      -       +      +
    691A  PHE*     2.9    53.5    +      -       +      +
    735A  TYR*     3.9    25.8    -      -       +      -
   1013A  CLA      3.8    15.5    -      -       +      -
    667B  PHE*     3.7    41.1    -      -       +      -
    671B  ILE*     5.0     0.2    -      -       +      -
    719B  PHE*     5.5     2.0    -      -       +      -
   1012B  CLA      4.1    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 688 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    684A  ALA      3.9     1.2    +      -       -      -
    685A  PHE*     3.1    41.2    +      -       +      +
    686A  SER      3.0     0.6    -      -       -      -
    687A  LEU*     1.3    80.7    -      -       -      +
    689A  PHE*     1.3    69.2    +      -       +      +
    692A  SER*     2.6    34.3    +      -       -      -
    697A  TRP*     3.7    20.6    -      -       +      -
   1013A  CLA      2.6    79.9    -      -       +      +
   1140A  CLA      4.9     2.7    -      -       +      -
   2001A  PQN      3.0    21.2    +      -       +      +
   4014B  BCR      5.4     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 689 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685A  PHE*     3.6    43.3    -      +       -      -
    686A  SER*     3.1    11.0    +      -       -      +
    688A  MET*     1.3   100.3    -      -       +      +
    690A  LEU*     1.3    62.1    +      -       -      +
    691A  PHE      3.6     0.3    +      -       -      -
    692A  SER      3.6     8.1    -      -       -      +
    722A  LEU*     4.0    14.1    -      -       +      -
    727A  GLY      3.5    21.8    -      -       -      +
    728A  ARG*     6.1     0.3    -      -       -      +
    730A  VAL*     3.5    32.5    -      -       +      -
    731A  GLY*     3.8     5.4    -      -       -      -
    734A  HIS*     5.0     0.7    -      +       -      -
   1140A  CLA      4.3    13.0    -      -       +      -
   2001A  PQN      3.2    63.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 690 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    596A  PHE*     3.6    32.3    -      -       +      -
    600A  PHE*     3.8    25.8    -      -       +      -
    686A  SER*     3.1    18.9    +      -       -      +
    687A  LEU*     3.4     5.1    +      -       +      +
    689A  PHE*     1.3    78.5    -      -       -      +
    691A  PHE*     1.3    68.7    +      -       +      +
    728A  ARG*     4.1     5.6    -      -       +      +
    731A  GLY*     3.6    31.9    -      -       -      +
    732A  VAL      3.7     2.5    -      -       -      +
    735A  TYR*     3.9    15.3    -      -       +      -
    670B  LEU      3.2    15.4    -      -       -      +
    671B  ILE*     4.1    17.2    -      -       +      +
    673B  TRP*     4.1    11.4    +      -       -      -
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Residues in contact with PHE 691 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    687A  LEU*     2.9    36.3    +      -       +      +
    690A  LEU*     1.3    82.2    -      -       +      +
    692A  SER*     1.3    60.8    +      -       -      +
   1013A  CLA      3.3    25.4    -      -       +      -
    575B  ASP*     4.3     1.0    -      -       -      +
    583B  TYR*     2.5    39.5    +      -       -      +
    587B  PHE*     3.7    32.8    -      +       +      -
    667B  PHE*     4.0    28.3    -      +       -      -
    670B  LEU*     3.6    31.4    -      -       +      +
    671B  ILE*     3.7    28.3    -      -       +      -
    673B  TRP*     5.1     3.3    -      -       -      -
    719B  PHE*     4.0    11.2    -      +       -      -
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Residues in contact with SER 692 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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    688A  MET      2.6    23.8    +      -       -      -
    689A  PHE      3.6    10.1    +      -       -      +
    690A  LEU      3.5     0.6    -      -       -      -
    691A  PHE*     1.3    79.2    -      -       -      +
    693A  GLY*     1.3    59.0    +      -       -      +
    697A  TRP*     3.0    29.8    +      -       -      -
   1013A  CLA      4.4     1.6    -      -       -      -
   2001A  PQN      3.3     6.5    +      -       -      -
    575B  ASP*     3.2    11.8    -      -       -      +
    584B  LEU*     3.4    30.1    -      -       -      -
    673B  TRP*     3.6    16.6    -      -       -      -
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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
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  Atomic class           I  II  III   IV   V   VI  VII  VIII
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   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
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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