Contacts of the helix formed by residues 1505 - 1532 (chain A) in PDB entry 4W8F


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 PHE1505 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1437A  LYS*     5.5     4.1    -      -       -      +
   1441A  ILE*     4.7     7.0    -      -       +      -
   1445A  TRP*     4.5    16.8    -      +       -      -
   1486A  ILE*     3.4    38.1    -      -       +      -
   1490A  ALA*     3.7    12.8    -      -       +      -
   1499A  VAL*     3.5    28.5    -      -       +      +
   1502A  ILE*     3.3    60.4    +      -       +      +
   1503A  PRO      3.4     0.2    -      -       -      -
   1504A  ASN*     1.3    75.5    -      -       -      +
   1506A  ASP*     1.3    69.4    +      -       -      +
   1507A  THR      3.1     0.7    -      -       -      -
   1508A  THR*     2.9    15.0    +      -       -      -
   1509A  LEU*     3.0    43.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP1506 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1437A  LYS*     4.1    18.1    -      -       -      +
   1440A  GLU*     3.4    33.1    -      -       -      +
   1441A  ILE*     3.4    27.4    -      -       +      +
   1444A  ASN*     4.6     4.5    +      -       -      +
   1505A  PHE*     1.3    78.7    -      -       -      +
   1507A  THR*     1.3    64.1    +      -       -      +
   1509A  LEU*     3.3     4.4    +      -       -      +
   1510A  LYS*     3.1    41.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR1507 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1504A  ASN*     3.8    32.0    +      -       -      +
   1505A  PHE      3.1     0.8    -      -       -      -
   1506A  ASP*     1.3    78.1    -      -       -      +
   1508A  THR*     1.3    64.1    +      -       -      +
   1510A  LYS*     3.4     4.1    +      -       -      +
   1511A  LEU*     3.0    48.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR1508 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1482A  GLU*     4.9    15.5    -      -       +      +
   1483A  TYR*     5.3     1.8    -      -       -      +
   1486A  ILE*     3.8    36.2    -      -       +      +
   1504A  ASN*     2.2    32.9    +      -       -      +
   1505A  PHE      2.9     6.8    +      -       -      -
   1507A  THR*     1.3    80.5    -      -       -      +
   1509A  LEU*     1.3    55.4    +      -       +      +
   1511A  LEU*     3.4     6.2    +      -       -      +
   1512A  THR*     2.6    44.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1509 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1441A  ILE*     3.8    15.9    -      -       +      +
   1444A  ASN*     4.1    12.6    -      -       +      -
   1445A  TRP*     3.6    35.9    -      -       +      -
   1448A  VAL*     3.5    14.7    -      -       +      +
   1483A  TYR*     4.2    30.5    -      -       +      -
   1486A  ILE*     4.5     7.9    -      -       +      -
   1505A  PHE*     3.0    39.3    +      -       +      +
   1506A  ASP*     3.8     6.3    -      -       -      +
   1508A  THR*     1.3    76.8    -      -       +      +
   1510A  LYS*     1.3    61.5    +      -       -      +
   1512A  THR*     2.8     6.6    +      -       -      +
   1513A  ILE*     2.8    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS1510 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1440A  GLU*     4.9     2.6    +      -       -      +
   1444A  ASN*     3.3    36.5    +      -       -      +
   1506A  ASP*     3.1    27.8    +      -       -      +
   1507A  THR*     3.9     5.6    -      -       -      +
   1509A  LEU*     1.3    76.3    -      -       -      +
   1511A  LEU*     1.3    64.9    +      -       +      +
   1513A  ILE*     3.3     7.9    -      -       +      +
   1514A  ASP*     3.0    37.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1511 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1479A  LEU*     4.8     1.5    -      -       -      +
   1507A  THR*     3.0    43.6    +      -       +      +
   1508A  THR*     3.7     6.7    -      -       -      +
   1510A  LYS*     1.3    79.7    -      -       +      +
   1512A  THR*     1.3    58.0    +      -       -      +
   1514A  ASP*     3.9     6.3    -      -       -      +
   1515A  SER*     3.1    29.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR1512 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1448A  VAL*     3.5    26.7    -      -       +      -
   1452A  TRP*     6.0     1.6    -      -       +      -
   1479A  LEU*     4.5    21.7    +      -       +      +
   1482A  GLU*     5.6     3.1    +      -       -      +
   1483A  TYR*     4.6    17.0    +      -       +      +
   1508A  THR*     2.6    27.9    +      -       -      +
   1509A  LEU*     2.8    13.4    +      -       -      +
   1511A  LEU*     1.3    76.4    -      -       -      +
   1513A  ILE*     1.3    58.7    +      -       -      -
   1515A  SER*     3.2     5.9    +      -       -      -
   1516A  LEU*     2.8    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE1513 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1444A  ASN*     4.2    14.8    -      -       -      +
   1447A  GLU*     3.6    31.0    -      -       +      +
   1448A  VAL*     3.7    16.5    -      -       +      +
   1451A  TYR*     3.5    40.6    -      -       +      -
   1509A  LEU      2.8    15.9    +      -       -      +
   1510A  LYS*     3.3    20.2    -      -       +      +
   1512A  THR*     1.3    72.7    -      -       -      +
   1514A  ASP*     1.3    69.8    +      -       -      +
   1516A  LEU*     3.3     3.3    +      -       +      -
   1517A  LYS*     2.9    41.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP1514 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1510A  LYS*     3.0    28.8    +      -       -      +
   1511A  LEU*     3.9     7.2    -      -       -      +
   1513A  ILE*     1.3    91.0    -      -       -      +
   1515A  SER*     1.3    57.3    +      -       -      +
   1517A  LYS*     3.4    11.3    +      -       -      +
   1518A  MET*     3.0    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER1515 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1475A  LYS*     3.4    28.3    +      -       -      +
   1479A  LEU*     3.3    34.1    -      -       -      +
   1511A  LEU      3.1    19.3    +      -       -      -
   1512A  THR      3.2     1.3    +      -       -      -
   1514A  ASP*     1.3    74.6    -      -       -      +
   1516A  LEU*     1.3    66.6    +      -       -      +
   1518A  MET*     3.1     9.2    +      -       -      +
   1519A  ILE*     3.0    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1516 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1448A  VAL*     3.5    28.3    -      -       -      +
   1451A  TYR*     3.9    15.0    -      -       +      -
   1452A  TRP*     3.6    26.2    -      -       +      +
   1455A  LEU*     3.8    19.0    -      -       +      +
   1476A  PHE*     4.1    19.3    -      -       +      -
   1479A  LEU*     3.7    23.6    -      -       +      -
   1512A  THR*     2.8    32.8    +      -       +      +
   1513A  ILE*     3.7     4.9    -      -       -      +
   1515A  SER*     1.3    76.4    -      -       -      +
   1517A  LYS*     1.3    58.4    +      -       -      +
   1519A  ILE*     2.9     9.3    +      -       +      +
   1520A  LYS*     2.8    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS1517 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1447A  GLU*     5.7     2.0    -      -       -      +
   1451A  TYR*     3.7    36.5    +      -       +      +
   1513A  ILE*     2.9    35.7    +      -       +      +
   1514A  ASP*     3.6    11.7    -      -       -      +
   1516A  LEU*     1.3    75.7    -      -       -      +
   1518A  MET*     1.3    57.3    +      -       -      +
   1520A  LYS*     3.8     7.3    -      -       -      +
   1521A  SER*     2.9    31.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET1518 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1475A  LYS*     4.6    15.7    -      -       +      +
   1514A  ASP      3.0    15.8    +      -       -      +
   1515A  SER*     3.4    13.0    -      -       -      +
   1516A  LEU      3.1     0.4    -      -       -      -
   1517A  LYS*     1.3    75.9    -      -       -      +
   1519A  ILE*     1.3    58.3    +      -       +      +
   1521A  SER*     3.8     8.4    -      -       -      -
   1522A  SER*     3.1    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE1519 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1455A  LEU*     3.9    11.0    -      -       +      -
   1459A  LEU*     3.7    24.5    -      -       +      -
   1472A  GLU*     3.4    37.0    -      -       +      +
   1475A  LYS*     4.0    13.9    -      -       +      -
   1476A  PHE*     4.0    17.7    -      -       +      +
   1479A  LEU*     3.9    26.9    -      -       +      -
   1515A  SER      3.0    12.9    +      -       -      +
   1516A  LEU*     2.9    10.6    +      -       +      +
   1518A  MET*     1.3    76.5    -      -       +      +
   1520A  LYS*     1.3    66.9    +      -       -      +
   1522A  SER*     2.9     7.3    +      -       -      -
   1523A  LEU*     2.8    24.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS1520 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1451A  TYR*     4.7    18.4    -      -       +      -
   1454A  ASP*     3.1    29.4    +      -       -      +
   1455A  LEU*     4.4    19.8    -      -       +      +
   1458A  ILE*     5.7     4.9    -      -       -      +
   1516A  LEU      2.8    18.2    +      -       -      +
   1517A  LYS*     3.8     8.7    -      -       -      +
   1519A  ILE*     1.3    74.3    -      -       -      +
   1521A  SER*     1.3    64.0    +      -       -      +
   1523A  LEU*     3.4    10.1    +      -       +      +
   1524A  SER*     3.1    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER1521 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1517A  LYS      2.9    19.2    +      -       -      -
   1518A  MET*     3.8    10.6    -      -       -      -
   1520A  LYS*     1.3    76.9    -      -       -      +
   1522A  SER*     1.3    58.5    +      -       -      +
   1524A  SER*     3.3     7.2    +      -       -      -
   1525A  THR*     2.9    38.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER1522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1471A  LEU*     6.0     0.3    -      -       -      +
   1472A  GLU*     2.3    37.0    +      -       -      -
   1518A  MET*     3.1    16.8    +      -       -      -
   1519A  ILE*     2.9     6.8    +      -       -      -
   1521A  SER*     1.3    79.4    -      -       -      +
   1523A  LEU*     1.3    51.7    +      -       -      +
   1525A  THR*     3.2     7.7    +      -       -      -
   1526A  PHE*     2.7    34.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1455A  LEU*     4.0    23.6    -      -       +      -
   1458A  ILE*     3.8    30.5    -      -       +      -
   1459A  LEU*     4.4    11.7    -      -       +      -
   1465A  ILE*     5.9     0.4    -      -       +      -
   1469A  LEU*     3.7    28.3    -      -       +      -
   1472A  GLU*     4.6     6.5    +      -       +      +
   1519A  ILE*     2.8    10.4    +      -       +      +
   1520A  LYS*     3.6    12.6    -      -       +      +
   1522A  SER*     1.3    74.6    -      -       -      +
   1524A  SER*     1.3    66.1    +      -       -      +
   1526A  PHE*     3.1    11.5    +      -       +      +
   1527A  LEU*     3.0    45.5    +      -       +      +
   1546A  LEU*     5.2     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER1524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1520A  LYS*     3.1    13.2    +      -       -      -
   1521A  SER*     3.5    10.8    -      -       -      -
   1523A  LEU*     1.3    80.2    -      -       -      +
   1525A  THR*     1.3    63.4    +      -       -      +
   1527A  LEU*     3.8     8.0    -      -       -      +
   1528A  GLU*     3.1    27.1    +      -       -      +
   1542A  ASN*     6.1     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR1525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1521A  SER*     2.9    24.3    +      -       -      -
   1522A  SER*     3.5     7.1    -      -       -      -
   1524A  SER*     1.3    74.4    -      -       -      +
   1526A  PHE*     1.3    66.9    +      -       -      +
   1528A  GLU*     3.3     5.3    +      -       +      +
   1529A  ARG*     2.9    67.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE1526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1465A  ILE*     5.0    10.8    -      -       +      -
   1468A  PHE*     5.0    11.7    -      -       +      -
   1469A  LEU*     4.0    42.8    -      -       +      -
   1472A  GLU*     5.1     1.3    -      -       -      +
   1522A  SER*     2.7    20.7    +      -       -      +
   1523A  LEU*     3.1     9.6    +      -       +      +
   1525A  THR*     1.3    74.7    -      -       -      +
   1527A  LEU*     1.3    75.1    +      -       +      +
   1529A  ARG*     3.3     8.2    +      -       +      +
   1530A  GLN*     3.0    55.0    +      -       +      +
   1546A  LEU*     5.1     0.9    -      -       +      -
   1549A  ILE*     5.1    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU1527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1523A  LEU*     3.0    33.2    +      -       +      +
   1524A  SER*     3.8     7.0    -      -       -      +
   1526A  PHE*     1.3    84.7    -      -       +      +
   1528A  GLU*     1.3    58.8    +      -       -      +
   1530A  GLN*     2.7    24.6    +      -       +      +
   1531A  ARG*     2.9    22.5    +      -       -      +
   1542A  ASN*     3.3    41.1    -      -       +      +
   1545A  LEU*     3.8    22.7    -      -       +      -
   1546A  LEU*     3.5    35.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU1528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1524A  SER*     3.1    18.2    +      -       -      +
   1525A  THR*     3.9     5.4    -      -       +      +
   1527A  LEU*     1.3    78.7    -      -       -      +
   1529A  ARG*     1.3    61.6    +      -       +      +
   1531A  ARG*     3.8    13.4    +      -       -      +
   1532A  ARG*     2.9    52.4    +      -       -      +
   1538A  TYR*     3.3    28.9    +      -       +      -
   1884A  GLU*     2.5    29.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG1529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1525A  THR*     2.9    45.5    +      -       +      +
   1526A  PHE*     3.6     8.1    -      -       +      +
   1528A  GLU*     1.3    77.0    -      -       +      +
   1530A  GLN*     1.3    62.5    +      -       -      +
   1532A  ARG*     3.5    20.1    +      -       -      +
   1533A  GLN*     3.8    16.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN1530 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1526A  PHE*     3.0    42.4    +      -       +      +
   1527A  LEU*     2.7    17.6    +      -       +      +
   1529A  ARG*     1.3    77.0    -      -       -      +
   1531A  ARG*     1.3    61.3    +      -       -      +
   1532A  ARG      3.4     0.2    +      -       -      -
   1533A  GLN*     3.5    16.2    +      -       -      +
   1537A  PHE*     3.8    12.3    -      -       +      -
   1545A  LEU*     3.9    15.5    -      -       +      -
   1549A  ILE*     3.0    37.3    -      -       +      +
   1603A  GLN*     3.6     8.0    -      -       -      +
   1605A  GLN*     3.2    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG1531 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1527A  LEU*     2.9    24.1    +      -       -      +
   1528A  GLU*     4.0    12.1    -      -       -      +
   1530A  GLN*     1.3    76.8    -      -       -      +
   1532A  ARG*     1.3    58.0    +      -       -      +
   1533A  GLN      3.0     0.4    -      -       -      -
   1534A  PHE      2.9    31.9    +      -       -      +
   1535A  PRO*     3.1     3.3    -      -       -      +
   1537A  PHE*     3.5    34.3    -      -       +      -
   1538A  TYR*     3.7    34.3    -      -       +      +
   1541A  GLY*     3.7    17.2    -      -       -      +
   1542A  ASN*     2.5    37.9    +      -       -      +
   1545A  LEU*     3.2    31.1    -      -       +      +
   1833A  ARG*     3.9    23.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG1532 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1528A  GLU*     2.9    35.4    +      -       -      +
   1529A  ARG*     3.5    15.8    +      -       -      +
   1530A  GLN      3.3     1.2    -      -       -      -
   1531A  ARG*     1.3    75.7    -      -       -      +
   1533A  GLN*     1.3    66.0    +      -       -      +
   1534A  PHE*     3.4     0.4    -      -       -      -
   1535A  PRO*     4.4     8.7    -      -       -      +
   1538A  TYR*     2.9    21.9    +      -       -      +
   1840A  GLN*     3.8    22.3    -      -       -      +
   1884A  GLU*     3.7    12.7    +      -       -      +
   1885A  GLU      3.1    26.8    +      -       -      +
   1886A  THR*     4.5     3.2    -      -       -      +
   1887A  PRO*     5.3     6.5    -      -       -      +
----------------------------------------------------------
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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