Contacts of the helix formed by residues 422 - 448 (chain C) in PDB entry 1MKD


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 422 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509B  GLN*     5.2    17.3    -      -       +      +
    199C  TRP*     4.9     3.4    -      -       +      -
    200C  GLY*     3.8    23.3    -      -       -      +
    420C  THR      4.8     0.7    -      -       -      +
    421C  LYS*     1.3    88.4    -      -       +      +
    423C  LEU*     1.3    66.1    -      -       -      +
    424C  GLN*     3.2     5.8    -      -       +      +
    425C  LEU*     2.8    33.8    +      -       +      +
    426C  TYR      3.1     9.2    +      -       -      -
    495C  THR*     4.7     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 423 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    505B  SER*     3.9    26.0    -      -       -      +
    506B  THR*     4.6     3.1    -      -       -      +
    421C  LYS      3.3     2.4    +      -       -      -
    422C  PRO*     1.3    69.9    -      -       -      +
    424C  GLN*     1.3    64.8    +      -       -      +
    426C  TYR*     4.2    13.7    -      -       +      -
    427C  ARG*     2.9    52.0    +      -       +      +
    495C  THR*     5.4     0.4    -      -       -      +
    499C  ASN*     3.5    31.7    +      -       +      +
    502C  TRP*     3.6    53.4    -      -       +      +
    503C  TYR*     4.6     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 424 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    508B  PRO*     3.8    24.5    -      -       +      +
    509B  GLN*     4.1    12.4    +      -       +      +
    510B  SER*     3.4    21.1    +      -       -      -
    202C  HIS*     3.1    34.7    +      -       -      -
    205C  ARG*     4.5     3.8    -      -       -      +
    422C  PRO*     3.0     5.2    +      -       +      +
    423C  LEU*     1.3    79.0    -      -       -      +
    425C  LEU*     1.3    61.1    +      -       +      +
    427C  ARG*     4.2     7.2    -      -       -      +
    428C  GLN*     3.1    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 425 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200C  GLY*     3.6    25.6    -      -       -      +
    201C  LEU      3.9    12.6    -      -       -      +
    202C  HIS*     4.0    26.9    -      -       +      +
    203C  VAL*     4.7     5.4    -      -       +      +
    204C  PHE*     3.8    26.0    -      -       +      -
    421C  LYS*     4.1    13.5    -      -       +      -
    422C  PRO*     2.8    33.7    +      -       +      +
    424C  GLN*     1.3    77.0    -      -       +      +
    426C  TYR*     1.3    66.8    +      -       -      +
    428C  GLN*     2.9    18.9    +      -       -      +
    429C  TRP*     3.1    24.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 426 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418C  ASN*     3.4    26.2    +      -       +      +
    419C  PRO*     3.6    24.9    -      -       +      +
    421C  LYS      4.1     3.6    -      -       -      +
    422C  PRO      3.1     9.1    +      -       -      +
    423C  LEU*     3.7     9.9    -      -       +      +
    425C  LEU*     1.3    78.6    -      -       -      +
    427C  ARG*     1.3    57.0    +      -       -      +
    429C  TRP*     3.1     8.9    +      -       -      +
    430C  THR*     2.9    40.5    +      -       -      -
    466C  GLN*     2.7    30.3    +      -       -      +
    470C  ILE*     3.4    21.5    -      -       +      +
    499C  ASN*     3.7    28.3    -      -       +      -
    503C  TYR*     3.5    25.6    -      +       -      -
   3003C  ZAR      3.6    15.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 427 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427B  ARG*     5.5     6.1    -      -       -      +
    502B  TRP*     5.9     1.2    -      -       -      -
    506B  THR*     3.9    26.5    -      -       -      +
    423C  LEU*     2.9    48.7    +      -       +      +
    424C  GLN*     4.2     7.1    -      -       -      +
    426C  TYR*     1.3    75.6    -      -       -      +
    428C  GLN*     1.3    63.2    +      -       +      +
    430C  THR*     3.3     2.6    +      -       -      -
    431C  ASP*     3.0    31.4    +      -       -      +
    502C  TRP*     3.1    32.3    -      -       +      -
    503C  TYR*     3.6    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 428 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202C  HIS*     3.7    11.7    +      -       -      -
    204C  PHE*     3.4    38.4    -      -       +      +
    424C  GLN*     3.1    46.3    +      -       +      +
    425C  LEU*     2.9     9.0    +      -       -      +
    427C  ARG*     1.3    77.1    -      -       +      +
    429C  TRP*     1.3    62.9    -      -       -      +
    431C  ASP*     3.3    11.0    +      -       -      +
    432C  ARG*     3.1    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 429 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203C  VAL*     4.0    11.8    -      -       +      +
    204C  PHE*     3.5    31.9    -      +       -      -
    255C  ALA      5.6     0.2    -      -       -      -
    256C  TYR*     3.6    28.7    -      +       -      -
    258C  ASN*     5.3     0.4    -      -       -      -
    260C  ILE*     3.8    11.4    -      -       +      -
    261C  HIS*     3.7    38.6    -      -       +      -
    264C  ASP*     3.5    30.3    +      -       +      -
    418C  ASN*     3.5    40.4    -      -       +      +
    421C  LYS*     5.4     4.3    -      -       +      +
    425C  LEU*     3.1    33.4    +      -       +      +
    426C  TYR*     3.3     7.2    -      -       -      +
    428C  GLN*     1.3    73.9    -      -       -      +
    430C  THR*     1.3    59.8    +      -       -      +
    432C  ARG*     3.0    13.9    +      -       -      +
    433C  ILE*     2.8    26.9    +      -       -      +
   3003C  ZAR      3.3    10.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 430 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426C  TYR*     2.9    32.8    +      -       -      -
    427C  ARG      3.6     4.3    -      -       -      -
    429C  TRP*     1.3    75.7    -      -       -      +
    431C  ASP*     1.3    66.6    +      -       -      +
    433C  ILE*     3.1     4.0    -      -       -      +
    434C  MET*     3.0    24.4    +      -       +      +
    462C  VAL*     3.8    20.2    -      -       +      -
    466C  GLN*     3.4    28.8    -      -       +      +
    503C  TYR*     3.2    25.4    +      -       -      +
   3003C  ZAR      3.3    11.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 431 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427C  ARG*     3.0    23.2    +      -       -      +
    428C  GLN*     3.5    10.8    -      -       -      +
    429C  TRP      3.2     0.2    -      -       -      -
    430C  THR*     1.3    80.8    -      -       -      +
    432C  ARG*     1.3    57.8    +      -       +      +
    434C  MET*     3.4     4.4    +      -       -      +
    435C  GLU*     2.9    30.5    +      -       -      +
    462C  VAL*     5.7     3.3    -      -       -      +
    503C  TYR*     5.5     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 432 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204C  PHE*     3.1    33.7    -      -       -      -
    255C  ALA*     2.8    55.0    +      -       +      +
    256C  TYR*     4.0     7.9    -      -       +      -
    258C  ASN*     4.0     9.1    -      -       -      +
    260C  ILE*     3.7    21.9    -      -       -      +
    428C  GLN*     3.1    19.3    +      -       -      +
    429C  TRP*     3.0    20.0    +      -       -      +
    431C  ASP*     1.3    75.5    -      -       +      +
    433C  ILE*     1.3    65.5    +      -       -      +
    435C  GLU*     3.1    10.0    +      -       -      +
    436C  GLU*     3.0    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 433 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256C  TYR*     3.6    38.3    -      -       +      -
    257C  HIS*     3.9    12.3    -      -       +      -
    429C  TRP      2.8    13.1    +      -       -      +
    430C  THR*     3.1    17.3    -      -       -      +
    432C  ARG*     1.3    72.7    -      -       -      +
    434C  MET*     1.3    70.9    +      -       +      +
    436C  GLU*     3.3     4.0    +      -       +      +
    437C  PHE*     2.9    64.1    +      -       +      -
    466C  GLN*     4.6     1.1    -      -       -      +
   3003C  ZAR      3.5    46.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 434 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430C  THR*     3.0    18.9    +      -       +      +
    431C  ASP*     3.9     4.7    -      -       -      +
    433C  ILE*     1.3    86.6    -      -       +      +
    435C  GLU*     1.3    66.2    +      -       -      +
    437C  PHE*     4.2     8.1    -      -       +      -
    438C  PHE*     3.1    59.0    +      -       +      -
    454C  MET*     3.5    52.7    -      -       +      +
    460C  ALA*     4.2     6.7    -      -       +      -
    462C  VAL*     3.9    38.8    -      -       +      -
    465C  SER*     5.2     1.1    -      -       -      +
    466C  GLN*     4.8     4.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 435 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255C  ALA*     3.7    20.2    -      -       +      +
    431C  ASP      2.9    19.9    +      -       -      +
    432C  ARG*     3.1    11.2    +      -       -      +
    434C  MET*     1.3    79.1    -      -       -      +
    436C  GLU*     1.3    50.3    +      -       -      +
    438C  PHE*     4.4     6.0    -      -       -      +
    439C  PRO*     2.5    34.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 436 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254C  VAL*     3.2    14.8    -      -       +      +
    255C  ALA*     4.1     9.2    -      -       +      +
    256C  TYR*     2.8    32.1    +      -       -      +
    257C  HIS*     2.8    37.3    +      -       -      -
    301C  HIS*     4.1     0.5    -      -       -      -
    303C  GLY*     3.2    34.9    -      -       -      +
    432C  ARG      3.0    14.1    +      -       -      +
    433C  ILE*     3.7     7.2    -      -       -      +
    434C  MET      3.1     0.4    -      -       -      -
    435C  GLU*     1.3    77.3    -      -       -      +
    437C  PHE*     1.3    70.4    +      -       +      +
    438C  PHE      3.3     0.2    -      -       -      -
    439C  PRO*     3.1    13.7    -      -       -      +
    440C  GLN*     3.5    11.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 437 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257C  HIS*     5.2     5.4    -      +       -      -
    303C  GLY      6.1     0.2    -      -       -      -
    433C  ILE*     2.9    51.0    +      -       +      +
    434C  MET*     3.4    11.4    +      -       -      +
    436C  GLU*     1.3    81.5    -      -       +      +
    438C  PHE*     1.3    57.4    +      -       -      +
    440C  GLN*     3.1    14.2    +      -       -      +
    441C  GLY      2.9    22.2    +      -       -      -
    454C  MET*     3.7    47.3    -      -       +      +
    455C  CYS*     3.3    32.4    -      -       -      +
   3003C  ZAR      4.0    28.9    -      +       -      -
----------------------------------------------------------
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Residues in contact with PHE 438 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434C  MET*     3.1    43.7    +      -       +      +
    435C  GLU*     4.4     4.9    -      -       -      +
    437C  PHE*     1.3    77.9    -      -       -      +
    439C  PRO*     1.4    58.0    -      -       +      +
    441C  GLY*     2.8     2.8    +      -       -      -
    442C  ASP*     2.6    40.9    +      -       -      +
    454C  MET      3.5    19.5    -      -       -      -
    455C  CYS      3.5     9.1    -      -       -      +
    457C  LYS*     3.5    49.6    -      -       +      -
    460C  ALA*     3.6    21.5    -      -       +      -
    462C  VAL*     4.9     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 439 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435C  GLU*     2.5    31.9    -      -       +      +
    436C  GLU*     3.1    11.7    -      -       -      +
    438C  PHE*     1.4    88.7    -      -       +      +
    440C  GLN*     1.3    56.3    +      -       -      +
    442C  ASP*     3.5    14.7    -      -       +      +
    443C  ARG*     2.9    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 440 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303C  GLY      4.0     3.3    +      -       -      +
    304C  VAL*     3.2    19.1    -      -       +      -
    305C  SER*     2.9    45.2    +      -       -      -
    308C  PHE*     3.8    21.2    -      -       +      +
    436C  GLU      3.5     9.6    +      -       -      +
    437C  PHE*     3.1    16.4    +      -       -      +
    438C  PHE      3.0     0.6    -      -       -      -
    439C  PRO*     1.3    77.2    -      -       -      +
    441C  GLY*     1.3    60.4    +      -       -      +
    443C  ARG*     3.1     8.8    +      -       -      +
    444C  GLU*     2.8    53.0    +      -       -      +
    452C  SER*     3.8     9.1    +      -       -      -
    455C  CYS*     4.0    13.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 441 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437C  PHE      2.9     7.7    +      -       -      -
    438C  PHE      2.8     3.8    +      -       -      -
    440C  GLN*     1.3    79.1    -      -       -      +
    442C  ASP*     1.3    57.1    +      -       -      +
    444C  GLU*     3.3    14.3    +      -       -      -
    445C  ARG*     2.9    27.9    +      -       -      +
    451C  ILE*     3.1    16.0    -      -       -      +
    455C  CYS*     3.2    25.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 442 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438C  PHE*     2.6    22.1    +      -       -      +
    439C  PRO*     3.5    17.7    -      -       +      +
    441C  GLY*     1.3    70.9    -      -       -      +
    443C  ARG*     1.3    66.2    +      -       -      +
    445C  ARG*     2.8    39.3    +      -       -      +
    446C  GLU*     2.9    26.4    +      -       +      +
    457C  LYS*     3.0    36.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 443 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302C  PRO      5.4     4.0    +      -       -      -
    304C  VAL*     3.8    18.4    -      -       -      +
    308C  PHE*     3.3    35.6    -      -       +      -
    439C  PRO*     2.9    25.5    +      -       +      +
    440C  GLN*     3.2    11.4    -      -       -      +
    442C  ASP*     1.3    76.1    -      -       -      +
    444C  GLU*     1.3    57.3    +      -       -      +
    446C  GLU*     3.3    20.3    +      -       -      +
    447C  ARG*     3.0    61.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 444 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308C  PHE*     3.6    24.8    -      -       +      +
    311C  ASN*     5.7     1.2    +      -       -      -
    440C  GLN*     2.8    32.5    +      -       -      +
    441C  GLY*     3.5    14.2    -      -       -      +
    442C  ASP      3.1     0.2    -      -       -      -
    443C  ARG*     1.3    75.4    -      -       -      +
    445C  ARG*     1.3    62.8    +      -       -      +
    448C  GLY      3.0     2.8    +      -       -      -
    449C  MET*     2.8    56.7    +      -       +      +
    450C  GLU      4.1     5.8    -      -       -      +
    451C  ILE*     3.6     9.6    -      -       +      -
    452C  SER*     2.6    50.1    +      -       -      -
    455C  CYS*     4.2     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 445 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441C  GLY      2.9    15.2    +      -       -      +
    442C  ASP*     2.8    39.4    +      -       -      +
    444C  GLU*     1.3    77.1    -      -       -      +
    446C  GLU*     1.3    63.8    +      -       +      +
    448C  GLY*     3.1    12.9    +      -       -      -
    449C  MET      4.6     1.8    -      -       -      -
    451C  ILE*     3.3    17.8    -      -       +      +
    456C  ASP*     3.0    28.9    +      -       -      +
    457C  LYS*     3.8    15.0    -      -       -      +
    458C  HIS*     3.8    26.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 446 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442C  ASP*     2.9    27.9    +      -       +      +
    443C  ARG*     3.3    26.6    +      -       -      +
    445C  ARG*     1.3    74.0    -      -       +      +
    447C  ARG*     1.3    70.4    +      -       -      +
    448C  GLY*     2.9     7.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 447 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308C  PHE*     4.1     8.6    -      -       +      -
    312C  THR*     4.1    16.9    -      -       +      +
    443C  ARG*     3.0    65.0    +      -       -      +
    444C  GLU      3.4     1.1    +      -       -      +
    446C  GLU*     1.3    82.2    +      -       -      +
    448C  GLY*     1.3    58.5    +      -       -      +
    449C  MET*     3.1    37.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 448 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444C  GLU      3.0     3.0    +      -       -      -
    445C  ARG      3.1    10.5    +      -       -      -
    446C  GLU      2.9     7.1    -      -       -      -
    447C  ARG*     1.3    80.0    -      -       -      +
    449C  MET*     1.3    63.7    +      -       -      +
----------------------------------------------------------
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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