Contacts of the helix formed by residues 490 - 511 (chain C) in PDB entry 1R4N


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PRO 490 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155C  THR*     4.1     3.0    -      -       +      +
    157C  GLY      3.0    25.4    -      -       -      +
    158C  LEU*     4.5     4.3    -      -       +      -
    488C  ALA      2.9    23.1    -      -       -      +
    489C  GLU*     1.3    76.8    -      -       -      +
    491C  HIS*     1.3    65.2    +      -       -      +
    492C  THR*     4.7     5.2    -      -       -      +
    493C  ILE*     3.2    13.9    +      -       +      +
    494C  ALA*     3.0    19.1    +      -       -      +
     19D  HIS*     4.2    15.7    -      -       +      +
     23D  PHE*     3.4    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 491 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40C  ALA*     4.3     6.0    -      -       +      +
     43C  THR*     5.8     0.2    -      -       +      -
     44C  GLU*     3.2    29.4    +      -       +      -
     72C  ASN*     2.8    31.9    +      -       +      +
     73C  ASN*     4.8     0.4    -      -       -      -
     74C  PHE      4.3     6.3    -      -       -      -
    489C  GLU      3.3     4.2    +      -       -      -
    490C  PRO*     1.3    67.1    -      -       -      +
    492C  THR*     1.3    57.3    +      -       +      +
    493C  ILE      2.8     5.0    +      -       -      -
    494C  ALA*     2.9     4.8    +      -       -      -
    495C  ALA*     2.6    36.7    +      -       +      +
     19D  HIS*     5.4     0.8    -      -       -      +
     65D  LYS*     2.7    32.1    +      -       +      -
     66D  ASN*     3.4    20.0    -      -       -      -
     69D  LEU*     3.5    44.1    +      -       +      +
     70D  SER*     5.4     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 492 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158C  LEU*     5.3     1.6    -      -       -      +
    490C  PRO*     4.7     5.5    -      -       -      +
    491C  HIS*     1.3    77.0    -      -       -      +
    493C  ILE*     1.3    65.6    +      -       -      +
    495C  ALA*     3.9     6.5    -      -       -      -
    496C  PHE*     3.4    15.8    +      -       -      +
    522C  TYR*     5.4     0.5    +      -       -      -
     66D  ASN*     4.1     8.1    -      -       +      +
     70D  SER*     3.4    25.1    +      -       -      +
    301D  ALA*     3.5    16.9    -      -       -      +
    304D  ALA*     3.5    28.0    -      -       +      -
    305D  THR*     2.8    34.8    +      -       -      +
    308D  PHE*     5.7     1.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 493 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155C  THR*     3.4    22.4    -      -       +      +
    157C  GLY      3.5    12.3    -      -       -      +
    158C  LEU*     3.4    44.4    -      -       +      +
    159C  VAL      4.2    15.7    -      -       -      +
    160C  GLY*     4.6     5.8    -      -       -      -
    490C  PRO*     3.2    12.9    +      -       +      +
    491C  HIS      2.8     1.2    +      -       -      -
    492C  THR*     1.3    78.7    +      -       -      +
    494C  ALA*     1.3    68.2    +      -       -      +
    495C  ALA      2.9     1.1    -      -       -      -
    496C  PHE*     2.8    16.1    +      -       -      +
    497C  LEU*     3.0    12.3    +      -       +      +
    522C  TYR*     3.6    27.8    -      -       +      +
    524C  GLY*     4.1     5.6    -      -       -      -
    305D  THR*     4.8     5.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 494 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40C  ALA*     3.6    16.8    -      -       +      -
     41C  THR*     3.4    36.2    -      -       -      +
     44C  GLU*     4.0     6.5    -      -       +      +
    155C  THR*     3.5    13.9    -      -       -      +
    489C  GLU*     4.1     2.5    -      -       +      +
    490C  PRO      3.0     9.1    +      -       -      +
    491C  HIS*     2.9     6.9    +      -       -      +
    493C  ILE*     1.3    78.3    -      -       -      +
    495C  ALA*     1.3    57.3    +      -       -      +
    497C  LEU*     3.4     2.2    +      -       -      +
    498C  GLY*     2.8    27.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 495 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44C  GLU*     3.9    14.6    -      -       +      +
     48C  ASN*     4.8     0.2    +      -       -      -
    491C  HIS*     2.6    21.6    +      -       +      +
    492C  THR      3.8     1.3    -      -       -      +
    493C  ILE      2.8     0.6    +      -       -      -
    494C  ALA*     1.3    70.3    -      -       -      +
    496C  PHE*     1.3    65.8    +      -       -      +
    498C  GLY*     3.0     2.9    +      -       -      -
    499C  GLY*     2.9    20.1    +      -       -      -
     62D  GLU*     5.6     2.0    -      -       -      +
     65D  LYS*     4.1    11.0    -      -       -      +
     66D  ASN*     3.7    19.7    -      -       -      +
    297D  ALA*     4.5     9.0    -      -       +      +
    301D  ALA*     3.6    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 496 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    492C  THR      3.4     9.6    +      -       -      +
    493C  ILE      2.8    11.3    +      -       -      +
    495C  ALA*     1.3    73.8    -      -       -      +
    497C  LEU*     1.3    69.3    +      -       +      +
    499C  GLY*     3.0    11.4    +      -       -      -
    500C  ALA*     3.1    16.9    +      -       +      -
    520C  TYR*     3.8    26.2    -      +       -      -
    522C  TYR*     3.4    66.4    -      +       +      +
    298D  VAL*     3.3    38.6    -      -       +      +
    301D  ALA*     3.4    12.4    -      -       +      +
    302D  VAL*     3.8    18.2    -      -       +      -
    322D  LEU*     5.8     2.5    -      -       +      -
    324D  PHE*     4.4    10.8    -      +       -      -
    332D  THR*     5.1     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 497 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  THR*     4.0     9.9    -      -       +      -
     45C  ILE*     4.9     0.7    -      -       -      -
    153C  CYS*     4.6     6.3    -      -       +      -
    154C  ARG      3.1    35.2    -      -       -      +
    155C  THR*     3.5    14.8    -      -       -      +
    160C  GLY*     3.8    27.8    -      -       -      +
    161C  TYR      3.5     8.3    -      -       -      +
    162C  MET*     4.0    26.2    -      -       +      -
    493C  ILE*     3.0     7.9    +      -       +      +
    494C  ALA      3.7     7.6    -      -       -      +
    496C  PHE*     1.3    90.7    -      -       +      +
    498C  GLY*     1.3    57.3    +      -       -      +
    499C  GLY      3.1     0.2    +      -       -      -
    500C  ALA*     3.3     2.3    +      -       +      +
    501C  ALA*     2.9    33.8    +      -       -      +
    520C  TYR*     5.0     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 498 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  THR*     4.4     0.6    -      -       -      +
     44C  GLU*     4.2     1.8    -      -       -      -
     45C  ILE*     3.3    33.6    -      -       -      +
     48C  ASN*     2.9    18.2    +      -       -      -
    494C  ALA      2.8    19.8    +      -       -      -
    495C  ALA      3.5     3.4    -      -       -      -
    497C  LEU*     1.3    74.5    -      -       -      +
    499C  GLY*     1.3    55.8    +      -       -      +
    502C  ALA*     3.1    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 499 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48C  ASN*     3.5    11.9    -      -       -      +
    495C  ALA      2.9     9.3    +      -       -      -
    496C  PHE      3.0     4.9    +      -       -      -
    498C  GLY*     1.3    77.0    -      -       -      +
    500C  ALA*     1.3    64.3    +      -       -      +
    502C  ALA*     3.6     2.9    -      -       -      +
    503C  GLN*     3.4    16.3    +      -       -      +
    294D  SER*     3.6    25.8    -      -       -      -
    297D  ALA*     3.8     7.4    -      -       -      -
    298D  VAL*     3.8     8.3    -      -       -      -
    326D  ASP*     5.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 500 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162C  MET*     4.3     4.5    -      -       +      -
    496C  PHE*     3.1    23.6    +      -       +      +
    497C  LEU*     4.1     2.5    -      -       +      +
    499C  GLY*     1.3    75.1    -      -       -      +
    501C  ALA*     1.3    62.9    +      -       -      +
    503C  GLN*     3.4     6.5    +      -       -      +
    504C  GLU*     3.3    28.9    +      -       -      +
    520C  TYR*     4.9     0.4    -      -       +      -
    298D  VAL*     3.6    10.8    -      -       +      +
    324D  PHE*     4.6     4.9    -      -       +      -
    326D  ASP*     4.5     3.5    -      -       -      +
    330D  LEU*     3.7    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 501 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45C  ILE*     4.0    14.6    -      -       +      -
    151C  LEU*     3.9     5.2    -      -       +      +
    153C  CYS*     3.7    20.6    -      -       -      -
    162C  MET*     3.6    22.5    -      -       -      -
    497C  LEU      2.9    17.7    +      -       -      +
    500C  ALA*     1.3    75.3    -      -       -      +
    502C  ALA*     1.3    67.0    +      -       -      +
    504C  GLU*     2.9    17.0    +      -       -      +
    505C  VAL*     3.0    17.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 502 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45C  ILE*     3.8    15.2    -      -       -      +
     48C  ASN*     3.2    29.8    -      -       +      +
     49C  LEU*     3.3    23.6    -      -       +      +
    498C  GLY      3.1    19.4    +      -       -      +
    499C  GLY      3.6     4.5    -      -       -      +
    501C  ALA*     1.3    79.7    -      -       -      +
    503C  GLN*     1.3    63.4    +      -       -      +
    505C  VAL*     3.3     1.8    +      -       -      -
    506C  ILE*     3.2    18.3    +      -       -      +
    294D  SER*     5.0     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 503 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  TRP*     4.2     0.9    -      -       -      -
    499C  GLY      3.4     4.1    +      -       -      +
    500C  ALA      3.6     9.4    -      -       -      +
    501C  ALA      3.1     0.6    -      -       -      -
    502C  ALA*     1.3    77.7    -      -       -      +
    504C  GLU*     1.3    60.6    +      -       -      +
    506C  ILE*     3.0    28.0    +      -       -      +
    507C  LYS*     2.8    50.4    +      -       -      +
    513C  PHE*     4.6     6.5    -      -       -      -
    185D  PHE*     3.0    43.6    -      -       +      -
    294D  SER*     3.4    19.4    +      -       -      -
    326D  ASP*     3.7    25.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 504 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151C  LEU*     4.4     8.5    -      -       +      -
    162C  MET*     4.6     1.6    -      -       +      -
    164C  ILE*     5.3     3.4    -      -       +      -
    500C  ALA      3.3    14.1    -      -       -      +
    501C  ALA*     2.9     9.7    +      -       -      +
    503C  GLN*     1.3    75.1    -      -       -      +
    505C  VAL*     1.3    64.8    +      -       -      +
    507C  LYS*     2.9    46.1    +      -       -      +
    508C  ILE*     2.8    32.7    +      -       +      +
    515C  ILE*     3.6     3.2    -      -       +      -
    516C  PHE*     3.4    49.9    +      -       +      -
    326D  ASP*     3.3    16.5    -      -       -      +
    330D  LEU*     3.3     7.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 505 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33C  VAL*     4.0    17.7    -      -       +      -
     45C  ILE*     4.9     1.8    -      -       +      -
     49C  LEU*     4.0    14.6    -      -       +      -
    125C  VAL*     4.3    13.0    -      -       +      -
    127C  VAL*     3.6    26.7    -      -       +      -
    151C  LEU*     3.7    12.1    -      -       +      +
    501C  ALA      3.0    15.6    +      -       -      +
    502C  ALA*     3.4    10.3    -      -       -      +
    504C  GLU*     1.3    76.6    -      -       -      +
    506C  ILE*     1.3    57.3    +      -       -      +
    508C  ILE*     3.3    10.7    -      -       -      +
    509C  ILE*     2.9    45.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 506 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  TRP*     3.7    38.4    -      -       +      -
     28C  LEU*     4.4    17.9    -      -       +      -
     48C  ASN      4.9     0.4    -      -       -      +
     49C  LEU*     3.8    17.0    -      -       +      -
     52C  PRO*     4.7     9.0    -      -       +      -
    502C  ALA      3.4    13.0    -      -       -      +
    503C  GLN*     3.0    29.2    +      -       -      +
    505C  VAL*     1.3    73.4    -      -       -      +
    507C  LYS*     1.3    58.1    +      -       -      +
    508C  ILE      2.9     2.1    +      -       -      -
    509C  ILE*     2.9     6.4    +      -       -      +
    510C  THR*     2.7    59.4    +      -       +      +
    513C  PHE*     6.2     0.4    -      -       +      -
    294D  SER*     4.3     8.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 507 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169C  HIS*     3.8     6.6    +      -       -      -
    503C  GLN*     2.8    39.1    +      -       -      +
    504C  GLU*     3.0    45.5    +      -       -      +
    506C  ILE*     1.3    72.5    -      -       -      +
    508C  ILE*     1.3    57.4    +      -       -      +
    510C  THR*     3.8     6.3    -      -       -      -
    511C  LYS*     2.9    27.2    +      -       -      -
    512C  GLN      3.4     2.6    +      -       -      -
    513C  PHE*     3.8    26.6    +      -       +      +
    514C  VAL      3.1    29.7    +      -       -      +
    515C  ILE*     4.0    10.5    -      -       +      -
    326D  ASP      2.6    32.3    +      -       -      -
    329D  GLY*     3.4    10.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 508 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124C  THR*     5.2     1.1    -      -       +      +
    125C  VAL*     3.5    32.3    -      -       +      -
    149C  PRO*     4.3     8.3    -      -       +      -
    150C  LEU      5.8     0.7    -      -       -      +
    151C  LEU*     5.5     6.1    -      -       +      -
    164C  ILE*     3.8    17.5    -      -       +      -
    166C  ILE*     3.6    35.9    -      -       +      -
    169C  HIS*     3.8    12.0    -      -       +      +
    504C  GLU*     2.8    20.0    +      -       +      +
    505C  VAL*     3.3    15.7    -      -       +      +
    507C  LYS*     1.3    75.5    -      -       -      +
    509C  ILE*     1.3    65.4    +      -       -      +
    511C  LYS*     3.3    19.8    +      -       -      +
    515C  ILE*     4.1    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 509 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27C  ALA*     3.7    23.3    -      -       -      +
     28C  LEU*     3.8    24.9    -      -       +      -
     31C  ALA*     3.4    34.3    -      -       +      -
     33C  VAL*     4.1    13.0    -      -       +      -
     49C  LEU*     5.8     0.9    -      -       +      -
     54C  ILE*     4.7     2.0    -      -       +      -
    124C  THR*     3.8    22.7    -      -       +      -
    125C  VAL*     4.4     3.6    -      -       +      -
    505C  VAL*     2.9    37.9    +      -       +      +
    506C  ILE*     2.9     7.0    +      -       +      +
    508C  ILE*     1.3    77.2    -      -       -      +
    510C  THR*     1.3    62.2    +      -       +      +
    511C  LYS*     3.5     5.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 510 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  TRP*     4.9     6.5    -      -       +      -
     24C  GLY*     3.6    31.4    -      -       -      +
     27C  ALA*     4.3     8.7    -      -       -      +
     28C  LEU*     4.4    10.1    -      -       +      +
    506C  ILE*     2.7    48.2    +      -       +      +
    507C  LYS*     3.7     2.3    +      -       -      -
    509C  ILE*     1.3    72.2    -      -       +      +
    511C  LYS*     1.3    70.5    +      -       -      +
    512C  GLN*     2.9    37.8    +      -       +      +
    513C  PHE*     4.7     1.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 511 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169C  HIS*     4.0    20.9    -      -       +      -
    170C  PRO*     4.8    17.0    -      -       +      +
    171C  VAL*     4.1    17.7    -      -       -      +
    172C  ILE      4.7     2.4    +      -       -      -
    173C  GLU*     4.2     5.5    +      -       -      +
    507C  LYS      2.9    15.3    +      -       -      -
    508C  ILE      3.6    12.3    -      -       -      +
    509C  ILE      3.3     5.3    -      -       -      +
    510C  THR*     1.3    78.9    -      -       -      +
    512C  GLN*     1.3    60.1    +      -       -      +
    513C  PHE      3.8     1.3    -      -       -      -
----------------------------------------------------------
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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