Contacts of the helix formed by residues 422 - 448 (chain F) 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 F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199F  TRP*     4.9     3.4    -      -       +      -
    200F  GLY*     3.8    24.2    -      -       -      +
    421F  LYS*     1.4    88.9    -      -       +      +
    423F  LEU*     1.3    66.4    +      -       -      +
    424F  GLN*     3.2     5.4    -      -       +      +
    425F  LEU*     2.8    33.4    +      -       +      +
    426F  TYR      3.1     9.7    +      -       -      -
    495F  THR*     4.7     7.2    -      -       +      -
    509J  GLN*     5.6    12.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 423 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421F  LYS      3.4     2.4    +      -       -      -
    422F  PRO*     1.3    71.4    -      -       -      +
    424F  GLN*     1.3    63.0    +      -       -      +
    426F  TYR*     4.2    12.8    -      -       +      -
    427F  ARG*     2.9    51.0    +      -       +      +
    495F  THR*     5.4     0.4    -      -       -      +
    499F  ASN*     3.5    31.2    +      -       +      +
    502F  TRP*     3.6    54.5    -      -       +      +
    503F  TYR*     4.6     1.1    -      -       +      -
    505J  SER*     4.5    10.1    -      -       -      +
    506J  THR*     4.5    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 424 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202F  HIS*     3.1    34.5    +      -       -      -
    205F  ARG*     4.5     4.3    +      -       -      +
    422F  PRO*     3.0     5.4    +      -       +      +
    423F  LEU*     1.3    79.0    -      -       -      +
    425F  LEU*     1.3    60.7    +      -       +      +
    427F  ARG*     4.1     7.0    -      -       -      +
    428F  GLN*     3.1    41.5    +      -       +      +
    508J  PRO*     3.9    26.5    -      -       +      +
    509J  GLN      4.7     3.3    +      -       -      +
    510J  SER*     3.5    21.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 425 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200F  GLY*     3.5    26.9    -      -       -      +
    201F  LEU      3.8    12.6    -      -       -      +
    202F  HIS*     4.0    27.6    -      -       +      +
    203F  VAL*     4.7     5.6    -      -       +      +
    204F  PHE*     3.8    26.5    -      -       +      -
    421F  LYS*     4.2    13.2    -      -       +      +
    422F  PRO*     2.8    31.8    +      -       +      +
    424F  GLN*     1.3    78.5    -      -       +      +
    426F  TYR*     1.3    66.6    +      -       -      +
    428F  GLN*     2.9    19.2    +      -       -      +
    429F  TRP*     3.1    22.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 426 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418F  ASN*     3.4    19.6    +      -       +      +
    419F  PRO*     3.5    30.5    -      -       +      +
    421F  LYS      4.2     4.0    -      -       -      +
    422F  PRO      3.1     7.9    +      -       -      +
    423F  LEU*     3.7    10.1    -      -       +      +
    425F  LEU*     1.3    77.6    -      -       -      +
    427F  ARG*     1.3    57.1    +      -       -      +
    429F  TRP*     3.0     9.8    +      -       -      +
    430F  THR*     2.9    41.0    +      -       -      -
    466F  GLN*     2.6    30.7    +      -       -      +
    470F  ILE*     3.4    21.6    -      -       +      +
    499F  ASN*     3.7    28.3    -      -       +      -
    503F  TYR*     3.5    26.9    -      +       -      -
   3006F  ZAR      3.5    15.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 427 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423F  LEU*     2.9    49.8    +      -       +      +
    424F  GLN*     4.1     6.3    -      -       -      +
    426F  TYR*     1.3    74.8    -      -       -      +
    428F  GLN*     1.3    61.8    +      -       +      +
    430F  THR*     3.3     2.4    +      -       -      -
    431F  ASP*     3.0    31.8    +      -       -      +
    502F  TRP*     3.1    35.9    -      -       +      -
    503F  TYR*     3.6    19.7    +      -       -      +
    427J  ARG*     5.5     5.7    -      -       -      +
    506J  THR*     4.4    15.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 428 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202F  HIS*     3.7    12.6    +      -       -      -
    204F  PHE*     3.4    39.3    -      -       +      +
    424F  GLN*     3.1    46.3    +      -       +      +
    425F  LEU*     2.9     9.0    +      -       -      +
    427F  ARG*     1.3    76.4    -      -       +      +
    429F  TRP*     1.3    62.8    +      -       -      +
    431F  ASP*     3.3    10.7    +      -       -      +
    432F  ARG*     3.1    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 429 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203F  VAL*     4.0    11.4    -      -       +      +
    204F  PHE*     3.5    33.2    -      +       -      -
    256F  TYR*     3.6    28.5    -      +       +      -
    258F  ASN*     5.3     0.7    -      -       -      -
    260F  ILE*     3.9    11.7    -      -       +      -
    261F  HIS*     3.7    38.1    -      -       +      -
    264F  ASP*     3.5    30.4    +      -       +      -
    418F  ASN*     3.5    41.1    -      -       +      +
    421F  LYS*     5.4     4.3    -      -       +      +
    425F  LEU*     3.1    33.0    +      -       +      +
    426F  TYR*     3.0     7.5    +      -       -      +
    428F  GLN*     1.3    74.4    -      -       -      +
    430F  THR*     1.3    55.5    +      -       -      +
    432F  ARG*     3.0    13.9    +      -       -      +
    433F  ILE*     2.8    32.1    +      -       -      +
   3006F  ZAR      3.4    10.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 430 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426F  TYR*     2.9    32.6    +      -       -      -
    427F  ARG      3.3     4.2    +      -       -      -
    429F  TRP*     1.3    76.2    -      -       -      +
    431F  ASP*     1.3    64.2    +      -       -      +
    433F  ILE*     3.1     4.8    -      -       -      +
    434F  MET*     3.0    30.1    +      -       +      +
    462F  VAL*     3.8    20.0    -      -       +      -
    466F  GLN*     3.4    27.9    -      -       +      +
    503F  TYR*     3.2    25.9    +      -       -      +
   3006F  ZAR      3.3    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 431 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427F  ARG*     3.0    22.7    +      -       -      +
    428F  GLN*     3.5    11.1    -      -       -      +
    429F  TRP      3.2     0.2    -      -       -      -
    430F  THR*     1.3    79.3    -      -       -      +
    432F  ARG*     1.3    59.8    +      -       +      +
    434F  MET*     3.8     4.4    -      -       -      +
    435F  GLU*     2.9    30.2    +      -       -      +
    462F  VAL*     5.7     2.9    -      -       -      +
    503F  TYR*     5.5     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 432 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204F  PHE*     3.1    38.1    -      -       -      -
    255F  ALA*     2.7    57.6    +      -       +      +
    256F  TYR*     4.0     7.0    -      -       +      -
    258F  ASN*     4.0     9.7    -      -       -      +
    260F  ILE*     3.7    21.9    -      -       -      +
    428F  GLN*     3.1    18.4    +      -       -      +
    429F  TRP*     3.0    18.2    +      -       -      +
    431F  ASP*     1.3    75.0    -      -       +      +
    433F  ILE*     1.3    65.2    +      -       -      +
    435F  GLU*     3.1    10.2    +      -       -      +
    436F  GLU*     3.0    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 433 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256F  TYR*     3.6    36.1    -      -       +      -
    257F  HIS*     3.9    12.8    -      -       +      +
    429F  TRP      2.8    13.1    +      -       -      +
    430F  THR*     3.1    15.0    -      -       -      +
    432F  ARG*     1.3    73.1    -      -       -      +
    434F  MET*     1.3    70.2    +      -       +      +
    436F  GLU*     3.2     3.8    +      -       +      +
    437F  PHE*     2.9    65.2    +      -       +      -
    466F  GLN*     4.6     0.7    -      -       -      +
   3006F  ZAR      3.6    47.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 434 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430F  THR*     3.0    18.7    +      -       +      +
    431F  ASP*     3.9     5.2    -      -       -      +
    433F  ILE*     1.3    85.9    -      -       +      +
    435F  GLU*     1.3    66.0    +      -       -      +
    437F  PHE*     3.8     6.9    -      -       +      +
    438F  PHE*     3.1    65.5    +      -       +      -
    454F  MET*     3.5    47.3    -      -       +      +
    460F  ALA*     4.2     6.5    -      -       +      -
    462F  VAL*     3.9    39.9    -      -       +      -
    465F  SER*     5.2     0.9    -      -       -      +
    466F  GLN*     4.8     5.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 435 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255F  ALA*     3.7    20.4    -      -       +      +
    431F  ASP      2.9    19.4    +      -       -      +
    432F  ARG*     3.1    11.6    +      -       -      +
    434F  MET*     1.3    79.5    -      -       -      +
    436F  GLU*     1.3    51.2    +      -       -      +
    438F  PHE*     4.4     5.6    -      -       -      +
    439F  PRO*     2.5    34.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 436 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254F  VAL*     3.2    14.9    -      -       +      +
    255F  ALA*     4.1     9.2    -      -       +      +
    256F  TYR*     2.8    32.4    +      -       +      +
    257F  HIS*     2.7    38.1    +      -       -      -
    301F  HIS*     4.1     0.3    -      -       -      -
    303F  GLY*     3.2    36.4    -      -       -      +
    432F  ARG      3.0    14.3    +      -       -      +
    433F  ILE*     3.6     5.8    -      -       -      +
    435F  GLU*     1.3    76.5    -      -       -      +
    437F  PHE*     1.3    70.2    +      -       +      +
    438F  PHE      3.3     0.4    -      -       -      -
    439F  PRO*     3.1    14.1    -      -       -      +
    440F  GLN*     3.5    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 437 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257F  HIS*     5.3     4.9    -      +       -      -
    303F  GLY      6.1     0.2    -      -       -      -
    433F  ILE*     2.9    51.8    +      -       +      +
    434F  MET*     3.4    11.0    +      -       -      +
    436F  GLU*     1.3    81.9    -      -       +      +
    438F  PHE*     1.3    57.8    +      -       -      +
    440F  GLN*     3.1    14.1    +      -       -      +
    441F  GLY      2.9    23.0    +      -       -      -
    454F  MET*     3.7    49.4    -      -       +      +
    455F  CYS*     3.3    31.9    -      -       -      +
   3006F  ZAR      3.9    29.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with PHE 438 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434F  MET*     3.1    43.4    +      -       +      -
    435F  GLU*     4.4     4.3    -      -       -      +
    437F  PHE*     1.3    76.2    -      -       -      +
    439F  PRO*     1.4    57.6    -      -       +      +
    441F  GLY*     2.9     2.1    +      -       -      -
    442F  ASP*     2.7    43.3    +      -       -      +
    454F  MET      3.4    19.3    -      -       -      -
    455F  CYS      3.5     9.7    -      -       -      +
    457F  LYS*     3.5    46.7    -      -       +      -
    460F  ALA*     3.6    22.0    -      -       +      -
    462F  VAL*     4.8     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 439 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435F  GLU*     2.5    31.0    -      -       +      +
    436F  GLU*     3.1    11.9    -      -       -      +
    438F  PHE*     1.4    89.1    -      -       +      +
    440F  GLN*     1.3    57.1    +      -       -      +
    442F  ASP*     3.5    14.9    -      -       +      +
    443F  ARG*     2.8    35.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 440 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303F  GLY      4.0     4.2    +      -       -      +
    304F  VAL*     3.2    17.0    -      -       +      -
    305F  SER*     3.0    46.3    +      -       -      -
    308F  PHE*     3.8    21.3    -      -       +      +
    436F  GLU      3.5     8.4    +      -       -      +
    437F  PHE*     3.1    16.6    +      -       -      +
    438F  PHE      3.0     0.4    -      -       -      -
    439F  PRO*     1.3    80.4    -      -       -      +
    441F  GLY*     1.3    53.5    +      -       -      +
    443F  ARG*     3.0     9.3    +      -       -      +
    444F  GLU*     2.8    56.4    +      -       -      +
    452F  SER*     3.8     9.1    +      -       -      -
    455F  CYS*     4.1    13.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 441 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437F  PHE      2.9    10.7    +      -       -      -
    438F  PHE      2.9     0.6    +      -       -      -
    440F  GLN*     1.3    78.6    -      -       -      +
    442F  ASP*     1.3    56.7    +      -       -      +
    444F  GLU*     3.3    14.5    +      -       -      -
    445F  ARG*     2.9    27.9    +      -       -      +
    451F  ILE*     3.1    16.6    -      -       -      +
    455F  CYS*     3.2    25.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 442 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438F  PHE*     2.7    21.0    +      -       -      +
    439F  PRO*     3.5    16.4    -      -       +      +
    441F  GLY*     1.3    71.5    -      -       -      +
    443F  ARG*     1.3    65.9    +      -       -      +
    445F  ARG*     2.8    35.7    +      -       -      +
    446F  GLU*     2.9    35.1    +      -       +      +
    457F  LYS*     3.1    35.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 443 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302F  PRO      5.4     3.6    +      -       -      -
    304F  VAL*     3.8    19.0    -      -       -      +
    308F  PHE*     3.3    34.6    -      -       +      -
    439F  PRO      2.8    24.8    +      -       -      +
    440F  GLN*     3.1    12.3    -      -       -      +
    442F  ASP*     1.3    76.6    -      -       +      +
    444F  GLU*     1.3    56.4    +      -       -      +
    446F  GLU*     3.4    18.7    +      -       -      +
    447F  ARG*     3.0    61.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 444 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308F  PHE*     3.6    24.5    -      -       +      +
    311F  ASN*     5.7     1.2    +      -       -      -
    440F  GLN*     2.8    31.8    +      -       -      +
    441F  GLY*     3.5    16.7    +      -       -      +
    443F  ARG*     1.3    75.4    -      -       -      +
    445F  ARG*     1.3    58.7    +      -       -      +
    447F  ARG*     3.4     3.7    +      -       -      -
    448F  GLY      3.0     6.2    +      -       -      -
    449F  MET*     2.8    53.6    +      -       +      +
    450F  GLU      4.1     5.2    -      -       -      +
    451F  ILE*     3.6     9.2    -      -       +      -
    452F  SER*     2.6    50.8    +      -       -      -
    455F  CYS*     4.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 445 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441F  GLY      2.9    15.3    +      -       -      +
    442F  ASP*     2.8    39.4    +      -       -      +
    444F  GLU*     1.3    76.2    -      -       -      +
    446F  GLU*     1.3    63.5    +      -       +      +
    448F  GLY*     3.1    12.9    +      -       -      -
    449F  MET      4.6     1.1    -      -       -      -
    451F  ILE*     3.3    18.1    -      -       +      +
    456F  ASP*     3.0    28.9    +      -       -      +
    457F  LYS*     3.8    16.0    -      -       -      +
    458F  HIS*     3.8    26.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 446 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442F  ASP*     2.9    28.1    +      -       +      +
    443F  ARG*     3.4    25.7    +      -       -      +
    445F  ARG*     1.3    73.8    -      -       +      +
    447F  ARG*     1.3    65.3    +      -       -      +
    448F  GLY*     2.9    12.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 447 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308F  PHE*     4.0     8.4    -      -       +      -
    312F  THR*     4.1    16.6    -      -       +      +
    443F  ARG*     3.0    61.9    +      -       -      +
    444F  GLU      3.4     1.1    +      -       -      +
    446F  GLU*     1.3    85.1    +      -       -      +
    448F  GLY*     1.3    58.6    +      -       -      +
    449F  MET*     3.1    38.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 448 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444F  GLU      3.0     2.6    +      -       -      -
    445F  ARG      3.6     9.6    -      -       -      -
    446F  GLU      2.9     7.1    +      -       -      -
    447F  ARG*     1.3    79.1    -      -       -      +
    449F  MET*     1.3    64.9    +      -       -      +
    450F  GLU      4.1     0.2    +      -       -      -
----------------------------------------------------------
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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