Contacts of the helix formed by residues 639 - 662 (chain A) in PDB entry 6A5T


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 GLY 639 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    635A  MET*     2.9    32.3    +      -       -      +
    636A  ARG      4.5     2.0    +      -       -      -
    637A  GLU      3.9     0.4    -      -       -      -
    638A  LYS*     1.3    82.5    -      -       -      +
    640A  PRO*     1.3    76.1    -      -       -      +
    643A  CYS*     3.7     8.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 640 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509A  PRO*     3.4    39.4    -      -       +      +
    510A  LEU*     3.9    18.4    -      -       +      -
    635A  MET*     3.4    18.6    -      -       +      -
    638A  LYS      4.6     0.4    -      -       -      +
    639A  GLY*     1.3    82.1    -      -       -      +
    641A  LYS*     1.3    65.4    +      -       +      +
    642A  ILE      3.1     2.0    -      -       -      -
    643A  CYS*     2.4    30.3    +      -       -      +
    644A  ALA      2.8     9.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 641 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509A  PRO*     4.9     4.0    -      -       -      -
    638A  LYS      5.2     0.4    +      -       -      +
    639A  GLY      3.7     0.2    -      -       -      -
    640A  PRO*     1.3    83.5    -      -       +      +
    642A  ILE*     1.3    70.7    +      -       +      +
    644A  ALA*     3.1    23.7    -      -       +      +
    645A  GLU*     3.1    21.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 642 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    584A  PRO*     4.0    30.7    -      -       +      -
    634A  VAL*     4.7     2.9    -      -       +      -
    638A  LYS*     3.7    42.4    +      -       +      +
    639A  GLY      4.3     0.4    +      -       -      -
    640A  PRO      3.1     0.6    -      -       -      -
    641A  LYS*     1.3    84.2    -      -       +      +
    643A  CYS*     1.3    66.7    +      -       -      +
    645A  GLU*     3.2    14.1    +      -       +      +
    646A  LEU*     2.9    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 643 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    512A  ILE*     3.5    22.2    -      -       +      -
    631A  ILE*     3.6    40.2    -      -       -      -
    634A  VAL*     5.0     6.4    -      -       -      +
    635A  MET*     3.6    28.9    -      -       -      +
    639A  GLY      3.7     3.8    +      -       -      +
    640A  PRO      2.4    23.8    +      -       -      +
    642A  ILE*     1.3    72.6    -      -       -      +
    644A  ALA*     1.3    61.2    +      -       -      +
    646A  LEU*     3.4    13.7    -      -       -      +
    647A  PHE*     3.2    16.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 644 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361A  GLU*     4.9     2.8    -      -       -      +
    362A  LEU*     4.5    20.2    -      -       +      +
    363A  ASP*     5.5     6.7    -      -       -      +
    509A  PRO*     4.0    26.0    -      -       +      -
    512A  ILE*     5.0     1.9    -      -       -      +
    640A  PRO      2.8     5.1    +      -       -      -
    641A  LYS*     3.1    14.4    -      -       +      +
    643A  CYS*     1.3    76.3    -      -       -      +
    645A  GLU*     1.3    68.8    +      -       +      +
    646A  LEU      2.8     1.9    +      -       -      -
    647A  PHE*     2.9    21.4    +      -       -      +
    648A  GLY      3.6     5.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 645 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361A  GLU*     4.4    18.6    -      -       -      +
    555A  PRO*     5.7     6.6    -      -       +      +
    556A  SER*     3.9    22.0    -      -       -      -
    641A  LYS*     3.1    22.8    +      -       +      +
    642A  ILE*     3.2    14.9    +      -       +      +
    644A  ALA*     1.3    81.2    -      -       +      +
    646A  LEU*     1.3    66.4    +      -       -      +
    648A  GLY*     3.3     3.6    +      -       -      +
    649A  ASN*     3.0    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 646 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    582A  ALA*     4.7     4.0    -      -       +      +
    583A  ILE*     4.4    14.6    -      -       +      +
    584A  PRO*     4.1    26.0    -      -       +      -
    630A  LEU*     4.7    12.8    -      -       +      -
    631A  ILE*     4.1    31.6    -      -       +      -
    634A  VAL*     5.2    10.8    -      -       +      -
    642A  ILE      2.9    13.4    +      -       -      +
    643A  CYS*     3.4    16.6    -      -       -      +
    644A  ALA      2.8     1.2    +      -       -      -
    645A  GLU*     1.3    74.4    -      -       -      +
    647A  PHE*     1.3    67.5    +      -       +      +
    649A  ASN*     2.8    18.2    +      -       -      +
    650A  ILE*     3.0    40.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 647 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362A  LEU*     3.6    29.8    -      -       +      -
    472A  ASN*     5.3     2.2    -      -       -      +
    474A  SER*     2.9    29.4    -      -       -      +
    512A  ILE*     5.0     8.3    -      -       +      -
    522A  MET*     3.1    22.2    -      -       +      -
    523A  GLY      3.1    24.2    -      -       -      -
    524A  ILE*     3.5    15.9    -      -       +      -
    631A  ILE*     3.6    32.3    -      -       +      -
    643A  CYS*     3.2    30.3    -      -       -      -
    644A  ALA      2.9     7.3    +      -       -      +
    646A  LEU*     1.3    80.8    -      -       +      +
    648A  GLY*     1.3    63.0    +      -       -      +
    650A  ILE*     4.7     4.7    -      -       -      +
    651A  GLN*     2.9    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 648 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360A  LEU      4.9     3.8    -      -       -      -
    361A  GLU*     4.4    16.5    +      -       -      -
    362A  LEU*     5.6     1.2    -      -       -      +
    472A  ASN*     5.6     2.1    -      -       -      +
    555A  PRO*     5.0     2.0    -      -       -      -
    644A  ALA      3.6     4.8    +      -       -      -
    645A  GLU*     3.3     6.2    +      -       -      -
    646A  LEU      3.2     1.0    -      -       -      -
    647A  PHE*     1.3    78.3    -      -       -      +
    649A  ASN*     1.3    63.7    +      -       -      +
    651A  GLN*     4.2     3.0    -      -       -      +
    652A  LYS*     3.0    46.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 649 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    554A  VAL*     3.6     8.7    -      -       +      +
    555A  PRO*     3.0    30.8    -      -       -      +
    556A  SER*     3.0    32.2    +      -       -      -
    582A  ALA*     3.5    30.1    +      -       +      -
    584A  PRO*     6.1     0.4    -      -       -      +
    645A  GLU*     3.0    22.5    +      -       -      +
    646A  LEU*     2.8    14.4    +      -       -      +
    648A  GLY*     1.3    72.7    -      -       -      +
    650A  ILE*     1.3    64.0    +      -       -      +
    652A  LYS*     4.1     0.9    -      -       -      +
    653A  VAL*     3.0    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 650 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    524A  ILE*     5.1    18.4    -      -       +      -
    528A  THR*     4.4    11.9    -      -       +      -
    532A  VAL*     4.9     7.2    -      -       +      -
    579A  LEU*     4.7    17.0    -      -       +      -
    582A  ALA*     4.4    16.2    -      -       +      -
    583A  ILE*     5.4     4.3    -      -       +      -
    623A  VAL*     5.2    18.4    -      -       +      -
    630A  LEU*     5.4     4.0    -      -       +      -
    631A  ILE*     5.8     0.9    -      -       +      -
    646A  LEU*     3.0    45.0    +      -       +      +
    647A  PHE*     4.2     4.5    -      -       -      +
    649A  ASN*     1.3    75.0    -      -       -      +
    651A  GLN*     1.3    65.1    +      -       +      +
    653A  VAL*     4.7     2.7    -      -       -      -
    654A  VAL*     3.0    37.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 651 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  PRO*     4.4    16.7    -      -       -      +
    472A  ASN*     3.0    24.6    +      -       -      +
    473A  LEU*     3.7    13.8    +      -       -      +
    474A  SER*     3.2    34.2    +      -       -      +
    524A  ILE*     4.8    14.0    -      -       +      +
    525A  VAL*     5.0     3.0    -      -       -      +
    528A  THR*     3.8    27.9    +      -       +      +
    647A  PHE      2.9    19.7    +      -       -      +
    648A  GLY*     4.2     1.9    -      -       -      +
    650A  ILE*     1.3    73.8    -      -       -      +
    652A  LYS*     1.3    68.1    +      -       +      +
    655A  ASN*     2.6    39.7    +      -       -      +
    835B  GLN*     5.6     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 652 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  PRO      4.7     9.7    +      -       -      +
    359A  ASN*     4.9    15.3    -      -       -      +
    360A  LEU      3.4    24.8    +      -       -      -
    361A  GLU*     4.0    10.7    +      -       -      -
    553A  TRP*     3.7    56.3    -      -       +      +
    555A  PRO*     4.1    15.9    -      -       +      +
    648A  GLY*     3.0    27.0    +      -       -      +
    649A  ASN*     4.1     2.2    -      -       -      +
    651A  GLN*     1.3    76.7    -      -       +      +
    653A  VAL*     1.3    68.0    +      -       +      +
    655A  ASN*     3.8     4.0    -      -       -      +
    656A  TYR*     3.0    22.0    +      -       -      +
     62K  LYS*     6.2     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 653 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    535A  MET*     4.7     9.4    -      -       +      -
    550A  MET*     4.2    34.0    -      -       +      +
    553A  TRP*     5.2     3.8    -      -       +      -
    554A  VAL*     3.4    31.2    -      -       +      +
    578A  LEU*     5.1    12.3    -      -       +      +
    579A  LEU*     5.4     5.8    -      -       +      +
    581A  ILE*     6.4     0.2    -      -       +      -
    582A  ALA*     5.4     4.0    -      -       +      -
    649A  ASN      3.0    22.7    +      -       -      +
    650A  ILE*     3.9     3.8    -      -       -      +
    652A  LYS*     1.3    80.7    -      -       +      +
    654A  VAL*     1.3    74.1    +      -       +      +
    656A  TYR*     2.8    12.6    +      -       -      +
    657A  TRP*     3.0    10.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 654 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    528A  THR*     3.6    18.2    -      -       +      +
    531A  GLY*     3.8     9.6    -      -       -      -
    532A  VAL*     3.3    55.4    -      -       +      +
    535A  MET*     4.6    13.2    -      -       +      -
    579A  LEU*     4.8     2.7    -      -       +      -
    650A  ILE*     3.0    21.9    +      -       +      +
    653A  VAL*     1.3    86.0    -      -       +      +
    655A  ASN*     1.3    57.9    +      -       -      +
    657A  TRP*     4.1     6.2    -      -       +      +
    658A  LEU*     2.8    27.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 655 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  PRO*     4.0    19.1    -      -       +      +
    528A  THR*     3.5    20.9    +      -       -      -
    651A  GLN*     2.6    39.8    +      -       -      +
    652A  LYS*     3.8     4.4    -      -       -      +
    654A  VAL*     1.3    78.5    -      -       -      +
    656A  TYR*     1.3    58.3    +      -       -      +
    658A  LEU*     3.0    11.2    +      -       -      +
    659A  LEU*     2.8    30.9    +      -       -      +
    830B  TYR      5.2     0.3    -      -       -      +
    831B  SER*     4.9    11.0    -      -       -      +
    832B  GLY*     4.1     9.8    +      -       -      -
    835B  GLN*     3.5    21.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 656 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546A  GLN*     4.4     4.5    +      -       +      +
    549A  ASN*     2.9    43.6    +      -       +      +
    550A  MET*     3.1    35.4    -      -       +      -
    553A  TRP*     3.3    39.0    -      +       +      +
    652A  LYS      3.0    14.8    +      -       -      +
    653A  VAL*     2.8     7.8    +      -       -      +
    655A  ASN*     1.3    73.0    -      -       -      +
    657A  TRP*     1.3    62.8    +      -       -      +
    659A  LEU*     3.3    19.6    -      -       +      +
    660A  HIS*     2.8    60.5    +      +       -      -
     61K  TYR*     5.6     4.4    +      +       -      -
----------------------------------------------------------
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Residues in contact with TRP 657 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531A  GLY      5.2     1.3    -      -       -      -
    534A  LYS*     4.5     9.4    -      -       +      -
    535A  MET*     3.5    54.7    -      -       +      -
    540A  THR*     4.6    12.3    -      -       +      -
    542A  ILE*     3.5    22.1    -      -       +      +
    546A  GLN*     3.6    18.1    -      -       -      +
    550A  MET*     3.3    41.7    -      -       +      -
    653A  VAL      3.0    10.4    +      -       -      +
    654A  VAL*     4.1     3.8    -      -       +      +
    656A  TYR*     1.3    77.3    -      -       -      +
    658A  LEU*     1.3    80.5    +      -       +      +
    660A  HIS      3.3     0.9    +      -       -      +
    661A  ASN*     2.9    57.2    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 658 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    527A  ASP*     4.3    21.5    -      -       +      +
    528A  THR*     5.9     0.7    -      -       -      -
    531A  GLY*     4.2    24.5    -      -       -      +
    534A  LYS*     5.6     4.0    -      -       +      -
    654A  VAL*     2.8    26.2    +      -       +      +
    655A  ASN*     3.0    11.4    +      -       -      +
    657A  TRP*     1.3    84.5    -      -       +      +
    659A  LEU*     1.3    53.7    +      -       -      +
    661A  ASN*     5.5     0.2    -      -       -      -
    662A  GLY*     2.4    43.2    +      -       -      +
    663A  PHE*     4.1    24.7    -      -       +      -
    829B  CYS*     4.1    28.3    -      -       +      +
    830B  TYR      4.8     2.7    -      -       -      +
    831B  SER*     6.3     0.2    -      -       -      -
    832B  GLY      5.7     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 659 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    655A  ASN      2.8    12.1    +      -       -      +
    656A  TYR*     3.3    31.0    -      -       +      +
    658A  LEU*     1.3    79.3    -      -       -      +
    660A  HIS*     1.3    75.2    +      -       +      +
    662A  GLY*     2.9     9.2    +      -       -      -
    830B  TYR*     3.0    55.1    +      -       +      +
    831B  SER*     4.2    16.8    -      -       -      +
   1074B  ASN*     4.8     9.9    -      -       -      +
   1076B  HIS*     4.9    14.8    -      -       +      +
   1081B  LEU*     3.2    15.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 660 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546A  GLN*     3.5    31.0    -      -       +      +
    656A  TYR*     2.8    65.6    +      +       -      +
    657A  TRP      3.3     0.2    +      -       -      -
    659A  LEU*     1.3    85.9    -      -       +      +
    661A  ASN*     1.3    61.4    +      -       -      +
   1074B  ASN*     3.3    26.5    +      -       -      -
   1076B  HIS*     5.1     3.4    -      -       +      -
   1077B  THR*     3.8    26.4    +      -       +      +
   1079B  LYS*     5.3    16.4    -      -       +      +
   1080B  LYS      4.2     9.9    -      -       -      +
   1081B  LEU*     3.8     9.9    -      -       -      +
   1082B  MET*     4.3     1.6    +      -       -      +
     61K  TYR*     5.8     2.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 661 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534A  LYS*     4.0    14.4    -      -       -      +
    546A  GLN*     4.9     1.0    -      -       -      +
    657A  TRP*     2.9    56.1    +      -       +      +
    658A  LEU*     3.7     2.2    -      -       +      +
    659A  LEU      3.3     0.7    -      -       -      -
    660A  HIS*     1.3    78.7    -      -       -      +
    662A  GLY*     1.3    82.6    +      -       -      +
   1081B  LEU*     3.5     5.7    -      -       -      +
   1082B  MET*     2.8    49.1    +      -       -      +
   1083B  ALA*     3.6     8.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 662 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534A  LYS*     4.5     2.3    -      -       -      -
    658A  LEU*     2.4    29.9    +      -       -      +
    659A  LEU*     2.9     7.3    +      -       -      -
    661A  ASN*     1.3    94.9    +      -       -      +
    663A  PHE*     1.3    65.3    +      -       -      +
    829B  CYS      4.7     7.9    -      -       -      -
   1081B  LEU*     4.1    15.3    -      -       -      -
   1083B  ALA*     4.0     5.9    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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