Contacts of the helix formed by residues 1401 - 1429 (chain A) in PDB entry 3MB3


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 SER1401 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1396A  THR*     3.4    26.3    -      -       -      +
   1398A  SER*     3.2    19.4    +      -       -      -
   1399A  LYS      3.1     2.5    -      -       -      +
   1400A  ARG*     1.3    78.6    -      -       -      +
   1402A  ARG*     1.3    66.1    +      -       -      +
   1403A  ILE*     3.1    15.6    +      -       -      +
   1404A  TYR*     3.1    17.4    +      -       -      +
   1405A  SER*     3.4     8.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG1402 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1400A  ARG      3.6     3.0    +      -       -      -
   1401A  SER*     1.3    74.8    +      -       -      +
   1403A  ILE*     1.3    77.3    +      -       +      +
   1405A  SER*     3.4     9.5    +      -       -      -
   1406A  MET*     3.1    32.8    +      -       +      +
   1409A  ARG*     4.8     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE1403 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MB3      4.1    28.7    -      -       -      +
   1340A  PRO*     3.7    27.4    -      -       +      -
   1341A  PHE*     4.0    23.1    -      -       +      -
   1392A  SER*     4.3     8.7    -      -       -      +
   1396A  THR*     4.1    10.1    -      -       +      +
   1401A  SER*     3.1    11.3    +      -       -      +
   1402A  ARG*     1.3    85.7    -      -       +      +
   1404A  TYR*     1.3    66.1    +      -       -      +
   1406A  MET*     3.3    13.5    +      -       -      +
   1407A  SER*     3.0    22.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR1404 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1392A  SER*     5.3     1.8    -      -       -      -
   1393A  LYS*     4.6    28.7    -      -       +      -
   1396A  THR*     3.7    18.6    -      -       -      +
   1397A  PRO      3.6    20.2    -      -       -      -
   1398A  SER      3.2    26.2    -      -       -      +
   1399A  LYS*     3.7    44.9    -      -       +      -
   1401A  SER*     3.1    11.0    +      -       -      +
   1403A  ILE*     1.3    79.5    -      -       -      +
   1405A  SER*     1.3    61.9    +      -       -      +
   1407A  SER*     3.3     6.3    +      -       -      -
   1408A  LEU*     3.0    57.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER1405 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1399A  LYS      4.5     6.2    +      -       -      -
   1401A  SER      3.4    11.5    +      -       -      -
   1402A  ARG*     3.4     9.6    +      -       -      -
   1403A  ILE      3.3     0.8    -      -       -      -
   1404A  TYR*     1.3    80.2    -      -       -      +
   1406A  MET*     1.3    61.3    +      -       -      +
   1408A  LEU*     3.2     7.4    +      -       -      +
   1409A  ARG*     2.9    52.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET1406 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1336A  GLU      3.6     5.8    -      -       -      +
   1337A  ASP*     2.8    52.4    -      -       -      +
   1339A  GLU*     4.9     0.7    -      -       +      -
   1340A  PRO*     3.1    24.9    -      -       +      -
   1341A  PHE*     4.7     2.0    -      -       +      -
   1402A  ARG*     3.1    25.4    +      -       +      +
   1403A  ILE*     3.3    28.5    +      -       -      +
   1405A  SER*     1.3    75.6    -      -       -      +
   1407A  SER*     1.3    63.9    -      -       -      +
   1409A  ARG*     3.2    26.4    +      -       -      +
   1410A  LEU*     2.9    26.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER1407 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1341A  PHE*     3.7    17.6    -      -       -      -
   1389A  PHE*     3.7    24.1    +      -       -      +
   1392A  SER*     3.7    25.6    +      -       -      -
   1393A  LYS*     5.1     1.2    +      -       -      +
   1403A  ILE      3.0    16.9    +      -       -      -
   1404A  TYR*     3.5     5.4    -      -       -      -
   1406A  MET*     1.3    78.1    -      -       -      +
   1408A  LEU*     1.3    58.0    +      -       -      +
   1410A  LEU*     3.8     2.2    -      -       -      -
   1411A  SER*     2.8    30.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU1408 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1393A  LYS*     6.4     2.7    -      -       +      -
   1404A  TYR*     3.0    48.3    +      -       +      +
   1405A  SER*     3.2     9.4    +      -       -      +
   1407A  SER*     1.3    76.2    -      -       -      +
   1409A  ARG*     1.3    58.5    +      -       +      +
   1411A  SER*     3.3     8.5    +      -       -      -
   1412A  ALA*     2.9    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG1409 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1337A  ASP*     2.9    42.7    +      -       -      +
   1402A  ARG      4.8     0.2    +      -       -      -
   1405A  SER*     2.9    40.4    +      -       -      +
   1406A  MET*     3.2    23.5    +      -       -      +
   1408A  LEU*     1.3    76.3    -      -       +      +
   1410A  LEU*     1.3    63.4    -      -       -      +
   1412A  ALA*     3.3     7.2    +      -       -      +
   1413A  PHE*     3.0    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1410 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1332A  ILE*     3.9    23.5    -      -       +      +
   1335A  CYS*     3.5    32.5    -      -       -      -
   1337A  ASP*     3.8    12.5    +      -       +      +
   1338A  SER*     3.6    26.9    -      -       -      +
   1341A  PHE*     3.9    15.9    -      -       +      -
   1363A  PHE*     4.0     9.2    -      -       +      -
   1389A  PHE*     4.0    15.5    -      -       +      -
   1406A  MET      2.9    15.0    +      -       -      +
   1407A  SER      3.9     3.1    -      -       -      +
   1409A  ARG*     1.3    77.2    -      -       -      +
   1411A  SER*     1.3    59.4    +      -       -      +
   1413A  PHE*     3.4    10.8    +      -       +      +
   1414A  PHE*     2.8    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER1411 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1389A  PHE*     3.6    34.6    -      -       -      +
   1407A  SER      2.8    18.7    +      -       -      -
   1408A  LEU*     3.6    12.8    -      -       -      -
   1410A  LEU*     1.3    77.1    -      -       -      +
   1412A  ALA*     1.3    52.1    +      -       -      +
   1414A  PHE*     3.1     3.1    +      -       -      +
   1415A  GLU*     2.8    47.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA1412 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1408A  LEU      2.9    17.9    +      -       -      +
   1409A  ARG*     3.6     8.3    -      -       -      +
   1411A  SER*     1.3    74.5    -      -       -      +
   1413A  PHE*     1.3    57.0    +      -       -      +
   1415A  GLU*     3.5     6.4    +      -       -      +
   1416A  GLU*     3.0    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE1413 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1328A  LEU*     3.9    19.5    -      -       +      -
   1331A  LEU*     4.4    25.6    -      -       +      -
   1332A  ILE*     4.2    22.0    -      -       +      -
   1335A  CYS*     6.1     1.3    -      -       -      -
   1409A  ARG      3.0    13.2    +      -       -      +
   1410A  LEU*     3.4    15.9    -      -       +      +
   1412A  ALA*     1.3    74.6    -      -       -      +
   1414A  PHE*     1.3    68.6    +      -       -      +
   1416A  GLU*     3.3    12.1    +      -       -      +
   1417A  HIS*     3.1    55.2    +      +       -      -
----------------------------------------------------------
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Residues in contact with PHE1414 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1328A  LEU*     4.0    24.7    -      -       +      -
   1329A  LEU*     5.5     2.2    -      -       +      -
   1332A  ILE*     4.0    17.5    -      -       +      -
   1381A  LEU*     4.4     5.8    -      -       +      -
   1382A  CYS*     4.2    17.0    -      -       -      -
   1385A  VAL*     3.6    46.9    -      -       +      -
   1386A  ARG*     4.8     2.9    -      -       +      -
   1389A  PHE*     4.1    11.4    -      +       +      -
   1410A  LEU      2.8    17.6    +      -       -      +
   1411A  SER      3.4     6.7    -      -       -      +
   1413A  PHE*     1.3    77.7    -      -       -      +
   1415A  GLU*     1.3    83.4    +      -       +      +
   1417A  HIS*     3.0     4.0    +      -       -      +
   1418A  ILE*     2.8    55.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU1415 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1386A  ARG*     2.8    53.6    +      -       -      +
   1389A  PHE*     5.4     0.7    -      -       -      -
   1411A  SER*     2.8    34.9    +      -       -      +
   1412A  ALA*     3.9     5.6    -      -       -      +
   1414A  PHE*     1.3    83.2    -      -       -      +
   1416A  GLU*     1.3    61.3    +      -       -      +
   1417A  HIS      3.3     0.3    +      -       -      -
   1418A  ILE*     3.7     7.9    -      -       -      +
   1419A  SER*     2.9    29.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU1416 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1412A  ALA*     3.0    27.1    +      -       +      +
   1413A  PHE*     3.5    14.9    -      -       -      +
   1414A  PHE      3.2     0.4    -      -       -      -
   1415A  GLU*     1.3    78.8    -      -       -      +
   1417A  HIS*     1.3    79.0    +      -       +      +
   1419A  SER*     4.1    10.9    +      -       -      -
   1420A  SER*     4.2     6.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS1417 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1328A  LEU*     3.7    28.0    -      -       +      -
   1331A  LEU*     6.0     4.6    -      -       +      +
   1413A  PHE*     3.1    55.7    +      +       -      +
   1414A  PHE      3.0     2.6    +      -       -      -
   1416A  GLU*     1.3    96.3    +      -       +      +
   1418A  ILE*     1.3    65.6    +      -       -      +
   1419A  SER      3.4     0.4    +      -       -      -
   1420A  SER*     3.6    12.4    +      -       -      -
   1421A  VAL*     3.4    15.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1418 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1325A  CYS*     4.0    21.3    -      -       -      -
   1328A  LEU*     4.2     9.4    -      -       +      +
   1378A  PRO*     5.5     1.6    -      -       +      -
   1381A  LEU*     4.8     2.5    -      -       +      -
   1382A  CYS*     3.4    30.1    -      -       -      -
   1386A  ARG*     4.6     4.3    -      -       -      +
   1414A  PHE*     2.8    50.2    +      -       +      +
   1415A  GLU*     3.7    18.6    -      -       -      +
   1417A  HIS*     1.3    76.0    -      -       -      +
   1419A  SER*     1.3    70.9    +      -       -      +
   1421A  VAL*     2.8    35.2    +      -       +      +
   1422A  LEU*     2.9    20.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER1419 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1415A  GLU      2.9    16.5    +      -       -      -
   1416A  GLU*     4.1     8.9    +      -       -      -
   1418A  ILE*     1.3    80.3    -      -       -      +
   1420A  SER*     1.3    56.7    +      -       -      +
   1422A  LEU*     3.2     7.3    +      -       -      +
   1423A  SER*     2.7    37.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER1420 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1416A  GLU      4.2     8.7    +      -       -      -
   1417A  HIS*     3.6     9.7    +      -       -      -
   1418A  ILE      3.2     0.8    -      -       -      -
   1419A  SER*     1.3    76.8    -      -       -      +
   1421A  VAL*     1.3    61.6    +      -       -      +
   1423A  SER*     4.4     6.3    -      -       -      -
   1424A  ASP*     2.9    44.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL1421 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1321A  TRP*     3.8    21.4    -      -       +      +
   1324A  GLN*     3.4    42.2    -      -       +      +
   1325A  CYS*     4.1     9.9    -      -       -      -
   1328A  LEU*     5.2     3.8    -      -       +      -
   1378A  PRO*     4.6     6.1    -      -       +      -
   1417A  HIS*     3.4    17.0    -      -       +      +
   1418A  ILE*     2.8    28.4    +      -       +      +
   1420A  SER*     1.3    79.3    -      -       -      +
   1422A  LEU*     1.3    58.6    +      -       -      +
   1424A  ASP*     4.0     2.6    -      -       -      +
   1425A  TYR*     3.2    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1422 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1378A  PRO*     4.0    27.4    -      -       +      -
   1379A  MET*     4.1    31.0    -      -       +      +
   1382A  CYS*     4.2    20.2    -      -       +      -
   1386A  ARG*     5.1    10.1    -      -       -      +
   1418A  ILE*     2.9    26.5    +      -       +      +
   1419A  SER*     3.7     7.9    -      -       -      +
   1421A  VAL*     1.3    75.0    -      -       -      +
   1423A  SER*     1.3    59.9    +      -       -      +
   1424A  ASP      3.2     0.2    -      -       -      -
   1425A  TYR*     3.0     6.0    +      -       +      +
   1426A  LYS*     2.8    41.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER1423 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1419A  SER*     2.7    23.1    +      -       -      -
   1420A  SER*     4.1     7.0    -      -       -      -
   1422A  LEU*     1.3    71.4    -      -       -      +
   1424A  ASP*     1.3    64.1    +      -       -      +
   1426A  LYS*     3.6     6.9    +      -       -      +
   1427A  SER*     3.2    26.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP1424 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1316A  TYR*     5.2    10.2    -      -       +      +
   1317A  ASP      5.3     0.4    -      -       -      +
   1324A  GLN*     4.5    17.0    +      -       -      +
   1420A  SER*     2.9    31.8    +      -       -      +
   1421A  VAL*     4.0     4.3    -      -       -      +
   1423A  SER*     1.3    78.0    -      -       -      +
   1425A  TYR*     1.3    60.7    +      -       -      +
   1427A  SER*     3.7     6.7    +      -       -      -
   1428A  ALA*     3.0    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR1425 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1317A  ASP      5.9     1.3    -      -       -      -
   1318A  ILE*     4.1    18.4    -      -       +      -
   1321A  TRP*     3.9    24.0    -      +       +      -
   1376A  GLU*     4.8     5.1    +      -       -      -
   1377A  SER*     3.7    13.4    -      -       -      -
   1378A  PRO*     3.7    28.7    -      -       +      -
   1379A  MET*     3.7    32.0    -      -       +      +
   1421A  VAL      3.2    14.9    +      -       -      +
   1422A  LEU*     3.0    11.0    +      -       -      +
   1424A  ASP*     1.3    74.1    -      -       -      +
   1426A  LYS*     1.3    68.4    -      -       +      +
   1428A  ALA*     3.0     5.9    +      -       -      +
   1429A  LEU*     2.9    69.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS1426 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1379A  MET*     4.3    34.0    -      -       -      +
   1422A  LEU*     2.8    31.0    +      -       +      +
   1423A  SER*     4.0     6.5    -      -       -      +
   1425A  TYR*     1.3    77.4    -      -       +      +
   1427A  SER*     1.3    61.2    +      -       -      +
   1429A  LEU*     3.3    27.1    -      -       +      +
   1430A  ARG*     3.9     4.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER1427 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1423A  SER      3.2    15.9    +      -       -      -
   1424A  ASP*     3.7     7.6    +      -       -      -
   1426A  LYS*     1.3    75.6    -      -       -      +
   1428A  ALA*     1.3    62.4    +      -       -      +
   1429A  LEU      3.1     1.6    -      -       -      -
   1430A  ARG*     2.8    34.2    +      -       -      +
   1431A  PHE*     5.0     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA1428 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1316A  TYR*     3.8    30.2    -      -       +      +
   1317A  ASP      4.1    16.8    -      -       -      +
   1318A  ILE*     4.5    12.8    -      -       +      +
   1424A  ASP      3.0    23.1    +      -       -      +
   1425A  TYR*     3.5     6.1    -      -       -      +
   1427A  SER*     1.3    76.2    +      -       -      +
   1429A  LEU*     1.3    60.0    +      -       -      +
   1430A  ARG      3.1     4.4    +      -       -      -
   1431A  PHE*     3.9    15.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1429 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1318A  ILE*     3.5    35.0    -      -       +      -
   1379A  MET*     6.3     0.2    -      -       +      -
   1425A  TYR*     2.9    54.8    +      -       +      +
   1426A  LYS*     3.3    18.8    -      -       +      +
   1427A  SER      3.1     0.4    -      -       -      -
   1428A  ALA*     1.3    75.0    -      -       -      +
   1430A  ARG*     1.3    56.2    +      -       -      +
   1431A  PHE      3.9     1.6    +      -       -      -
----------------------------------------------------------
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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
------------------------------------------------------------
  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