Contacts of the helix formed by residues 422 - 448 (chain J) 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 J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199J  TRP*     4.9     3.4    -      -       +      -
    200J  GLY*     3.8    23.6    -      -       -      +
    420J  THR      4.8     0.4    -      -       -      +
    421J  LYS*     1.4    88.3    -      -       +      +
    423J  LEU*     1.3    66.7    +      -       -      +
    424J  GLN*     3.2     5.6    -      -       +      +
    425J  LEU*     2.9    33.5    +      -       +      +
    426J  TYR      3.0     9.9    +      -       -      -
    495J  THR*     4.7     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 423 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    505F  SER*     4.0    24.9    -      -       -      +
    506F  THR*     5.0     0.4    -      -       -      +
    421J  LYS      3.3     3.7    +      -       -      -
    422J  PRO*     1.3    70.4    -      -       -      +
    424J  GLN*     1.3    64.8    +      -       -      +
    426J  TYR*     4.2    12.6    -      -       +      -
    427J  ARG*     2.9    51.7    +      -       +      +
    495J  THR*     5.4     0.4    -      -       -      +
    499J  ASN*     3.4    30.5    +      -       +      +
    502J  TRP*     3.6    54.3    -      -       +      +
    503J  TYR*     4.6     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 424 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    505F  SER      5.9     0.6    +      -       -      -
    508F  PRO*     4.1    10.6    -      -       +      +
    509F  GLN*     3.3    40.5    +      -       +      +
    510F  SER*     4.2     6.3    +      -       -      -
    202J  HIS*     3.1    34.2    +      -       -      -
    205J  ARG*     4.5     3.6    -      -       -      +
    422J  PRO*     3.1     5.4    +      -       +      +
    423J  LEU*     1.3    77.6    -      -       -      +
    425J  LEU*     1.3    63.5    +      -       +      +
    427J  ARG*     3.9     8.0    +      -       -      +
    428J  GLN*     3.2    37.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 425 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200J  GLY*     3.6    26.7    -      -       -      +
    201J  LEU      3.9    11.2    -      -       -      +
    202J  HIS*     4.1    28.7    -      -       +      +
    203J  VAL*     4.7     4.7    -      -       +      +
    204J  PHE*     3.8    25.8    -      -       +      -
    421J  LYS*     4.2    13.9    -      -       +      +
    422J  PRO*     2.9    32.9    +      -       +      +
    424J  GLN*     1.3    79.6    -      -       +      +
    426J  TYR*     1.3    65.7    +      -       -      +
    428J  GLN*     2.9    19.7    +      -       -      +
    429J  TRP*     3.1    23.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 426 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418J  ASN*     3.4    21.0    +      -       +      +
    419J  PRO*     3.5    31.8    -      -       +      +
    421J  LYS*     4.1     3.8    -      -       -      +
    422J  PRO      3.0     8.3    +      -       -      +
    423J  LEU*     3.3    11.6    +      -       +      +
    425J  LEU*     1.3    78.2    -      -       -      +
    427J  ARG*     1.3    57.2    +      -       -      +
    429J  TRP*     3.1     8.3    +      -       -      +
    430J  THR*     2.9    40.4    +      -       -      -
    466J  GLN*     2.6    30.3    +      -       -      +
    470J  ILE*     3.5    20.7    -      -       +      +
    499J  ASN*     3.7    27.8    -      -       +      -
    503J  TYR*     3.5    27.1    -      +       -      -
   3010J  ZAR      3.5    15.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 427 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427F  ARG*     5.5     5.5    -      -       -      +
    502F  TRP*     5.2     4.9    -      -       -      -
    506F  THR*     3.5    34.8    +      -       -      +
    423J  LEU*     2.9    48.8    +      -       +      +
    424J  GLN*     4.1     6.9    -      -       -      +
    426J  TYR*     1.3    75.5    -      -       -      +
    428J  GLN*     1.3    63.4    +      -       +      +
    430J  THR*     3.3     2.9    +      -       -      -
    431J  ASP*     3.0    31.0    +      -       -      +
    502J  TRP*     3.2    32.3    -      -       +      -
    503J  TYR*     3.7    20.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 428 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202J  HIS*     3.8    12.4    +      -       -      -
    204J  PHE*     3.4    38.7    -      -       +      +
    424J  GLN*     3.2    46.7    +      -       +      +
    425J  LEU*     2.9     9.2    +      -       -      +
    427J  ARG*     1.3    76.2    -      -       +      +
    429J  TRP*     1.3    63.0    +      -       -      +
    431J  ASP*     3.3    12.0    +      -       -      +
    432J  ARG*     3.1    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 429 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203J  VAL*     4.0    11.0    -      -       +      +
    204J  PHE*     3.5    27.7    -      +       -      -
    255J  ALA      5.6     0.2    -      -       -      -
    256J  TYR*     3.6    28.3    -      +       -      -
    258J  ASN*     5.3     0.7    -      -       -      -
    260J  ILE*     3.8    15.7    -      -       +      -
    261J  HIS*     3.7    37.7    -      -       +      -
    264J  ASP*     3.5    29.9    +      -       +      -
    418J  ASN*     3.5    40.5    -      -       +      +
    421J  LYS*     5.4     4.5    -      -       +      +
    425J  LEU*     3.1    34.6    +      -       +      +
    426J  TYR*     3.4     7.2    -      -       -      +
    428J  GLN*     1.3    77.9    -      -       -      +
    430J  THR*     1.3    61.8    -      -       -      +
    432J  ARG*     3.0    14.1    +      -       -      +
    433J  ILE*     2.8    21.3    +      -       -      +
   3010J  ZAR      3.3     9.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 430 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426J  TYR*     2.9    32.7    +      -       -      -
    427J  ARG      3.6     4.5    -      -       -      -
    429J  TRP*     1.3    75.2    -      -       -      +
    431J  ASP*     1.3    65.1    +      -       -      +
    433J  ILE*     3.1     4.1    -      -       -      +
    434J  MET*     3.1    23.4    +      -       +      +
    462J  VAL*     3.8    20.6    -      -       +      -
    466J  GLN*     3.4    29.1    -      -       +      +
    503J  TYR*     3.2    27.3    +      -       -      +
   3010J  ZAR      3.3    10.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 431 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427J  ARG*     3.0    22.6    +      -       -      +
    428J  GLN*     3.5    11.4    -      -       -      +
    429J  TRP      3.1     0.2    -      -       -      -
    430J  THR*     1.3    80.9    -      -       -      +
    432J  ARG*     1.3    59.7    +      -       +      +
    434J  MET*     3.8     5.3    -      -       -      +
    435J  GLU*     2.9    30.6    +      -       -      +
    462J  VAL*     5.7     3.1    -      -       -      +
    503J  TYR*     5.5     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 432 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204J  PHE*     3.1    34.2    -      -       -      -
    255J  ALA*     2.7    56.1    +      -       +      +
    256J  TYR*     4.0     8.1    -      -       +      -
    258J  ASN*     4.0     9.5    -      -       -      +
    260J  ILE*     3.7    21.9    -      -       -      +
    428J  GLN*     3.1    18.7    +      -       -      +
    429J  TRP*     3.0    19.1    +      -       -      +
    431J  ASP*     1.3    74.4    -      -       +      +
    433J  ILE*     1.3    64.3    +      -       -      +
    435J  GLU*     3.1    10.9    +      -       -      +
    436J  GLU*     3.0    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 433 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256J  TYR*     3.6    38.3    -      -       +      -
    257J  HIS*     3.8    11.7    -      -       +      -
    429J  TRP      2.8    12.0    +      -       -      +
    430J  THR*     3.1    14.8    -      -       -      +
    432J  ARG*     1.3    73.5    -      -       -      +
    434J  MET*     1.3    71.0    +      -       +      +
    436J  GLU*     3.2     3.6    +      -       +      +
    437J  PHE*     2.9    65.0    +      -       +      -
    466J  GLN*     4.6     0.9    -      -       -      +
   3010J  ZAR      3.5    48.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 434 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430J  THR*     3.1    18.9    +      -       +      +
    431J  ASP*     3.9     5.2    -      -       -      +
    433J  ILE*     1.3    85.1    -      -       +      +
    435J  GLU*     1.3    65.7    +      -       -      +
    437J  PHE*     3.8     6.9    -      -       -      +
    438J  PHE*     3.1    64.9    +      -       +      -
    454J  MET*     3.6    46.2    -      -       +      +
    460J  ALA*     4.1     6.1    -      -       +      -
    462J  VAL*     3.9    39.5    -      -       +      -
    465J  SER*     5.2     1.3    -      -       -      +
    466J  GLN*     4.8     4.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 435 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255J  ALA*     3.7    19.2    -      -       +      +
    431J  ASP      2.9    19.5    +      -       -      +
    432J  ARG*     3.4    11.7    -      -       -      +
    434J  MET*     1.3    79.1    -      -       -      +
    436J  GLU*     1.3    50.5    +      -       -      +
    438J  PHE*     4.6     5.8    -      -       -      -
    439J  PRO*     2.6    33.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 436 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254J  VAL*     3.1    14.5    -      -       +      +
    255J  ALA*     4.1     9.2    -      -       +      +
    256J  TYR*     2.8    31.6    +      -       -      +
    257J  HIS*     2.7    37.7    +      -       -      -
    301J  HIS*     4.1     0.3    -      -       -      -
    303J  GLY*     3.2    35.1    -      -       -      +
    432J  ARG      3.0    14.0    +      -       -      +
    433J  ILE*     3.6     7.2    -      -       -      +
    434J  MET      3.1     0.2    -      -       -      -
    435J  GLU*     1.3    77.2    -      -       -      +
    437J  PHE*     1.3    67.9    +      -       +      +
    438J  PHE      3.3     0.4    -      -       -      -
    439J  PRO*     3.0    14.2    -      -       -      +
    440J  GLN*     3.5    10.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 437 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257J  HIS*     5.2     5.4    -      +       -      -
    303J  GLY      6.2     0.4    -      -       -      -
    433J  ILE*     2.9    51.4    +      -       +      +
    434J  MET*     3.3    11.0    +      -       -      +
    436J  GLU*     1.3    81.5    -      -       +      +
    438J  PHE*     1.3    57.3    +      -       -      +
    440J  GLN*     3.1    13.9    +      -       -      +
    441J  GLY      2.9    21.8    +      -       -      -
    454J  MET*     3.7    49.4    -      -       +      +
    455J  CYS*     3.3    30.1    -      -       -      +
   3010J  ZAR      4.0    29.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with PHE 438 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434J  MET*     3.1    44.4    +      -       +      -
    435J  GLU*     4.4     3.8    -      -       -      +
    437J  PHE*     1.3    73.0    -      -       -      +
    439J  PRO*     1.3    60.7    -      -       +      +
    441J  GLY*     2.9     2.6    +      -       -      -
    442J  ASP*     2.7    40.4    +      -       -      +
    454J  MET      3.4    19.3    -      -       -      -
    455J  CYS      3.5     9.9    -      -       -      +
    457J  LYS*     3.5    50.3    -      -       +      -
    460J  ALA*     3.6    21.8    -      -       +      -
    462J  VAL*     4.8     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 439 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435J  GLU*     2.6    31.9    -      -       +      +
    436J  GLU*     3.0    17.0    -      -       -      +
    438J  PHE*     1.3    83.3    -      -       +      +
    440J  GLN*     1.3    54.6    +      -       -      +
    442J  ASP*     3.3    13.8    +      -       +      +
    443J  ARG*     2.8    35.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 440 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303J  GLY      4.0     3.7    +      -       -      +
    304J  VAL*     3.3    17.8    -      -       +      -
    305J  SER*     3.0    44.9    +      -       -      -
    308J  PHE*     3.8    21.2    -      -       +      +
    436J  GLU      3.5     8.5    +      -       -      +
    437J  PHE*     3.1    16.8    +      -       -      +
    438J  PHE      3.0     0.4    -      -       -      -
    439J  PRO*     1.3    79.0    -      -       -      +
    441J  GLY*     1.3    60.4    +      -       -      +
    443J  ARG*     3.0     9.3    +      -       -      +
    444J  GLU*     2.8    52.4    +      -       -      +
    452J  SER*     3.8     8.7    +      -       -      -
    455J  CYS*     4.0    13.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 441 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437J  PHE      2.9     7.9    +      -       -      -
    438J  PHE      2.9     3.6    +      -       -      -
    440J  GLN*     1.3    77.5    -      -       -      +
    442J  ASP*     1.3    56.6    +      -       -      +
    444J  GLU*     3.3    14.3    +      -       -      -
    445J  ARG*     2.9    27.7    +      -       -      +
    451J  ILE*     3.1    16.6    -      -       -      +
    455J  CYS*     3.2    25.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 442 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438J  PHE*     2.7    22.5    +      -       -      +
    439J  PRO*     3.5    16.6    -      -       +      +
    440J  GLN      3.1     0.2    -      -       -      -
    441J  GLY*     1.3    69.9    -      -       -      +
    443J  ARG*     1.3    65.5    +      -       -      +
    445J  ARG*     2.8    39.6    +      -       -      +
    446J  GLU*     2.9    26.2    +      -       -      +
    457J  LYS*     3.1    36.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 443 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302J  PRO      5.3     4.6    +      -       -      -
    304J  VAL*     3.8    18.6    -      -       -      +
    308J  PHE*     3.4    34.5    -      -       +      -
    439J  PRO*     2.8    25.2    +      -       +      +
    440J  GLN*     3.2    13.0    -      -       -      +
    442J  ASP*     1.3    76.3    -      -       -      +
    444J  GLU*     1.3    56.4    +      -       -      +
    446J  GLU*     3.4    19.2    +      -       -      +
    447J  ARG*     3.0    61.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 444 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308J  PHE*     3.6    23.9    -      -       +      +
    311J  ASN*     5.7     1.4    +      -       -      -
    440J  GLN*     2.8    31.7    +      -       -      +
    441J  GLY*     3.5    14.6    +      -       -      +
    443J  ARG*     1.3    75.3    -      -       -      +
    445J  ARG*     1.3    62.3    +      -       -      +
    447J  ARG*     3.4     3.0    +      -       -      -
    448J  GLY      3.0     2.6    +      -       -      -
    449J  MET*     2.8    54.0    +      -       +      +
    450J  GLU      4.1     5.9    -      -       -      +
    451J  ILE*     3.6    10.7    -      -       +      -
    452J  SER*     2.6    50.6    +      -       -      -
    455J  CYS*     4.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 445 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441J  GLY      2.9    14.3    +      -       -      +
    442J  ASP*     2.8    44.5    +      -       -      +
    444J  GLU*     1.3    73.8    -      -       -      +
    446J  GLU*     1.3    65.7    +      -       +      +
    448J  GLY*     3.1    13.7    +      -       -      -
    449J  MET      4.6     1.6    -      -       -      -
    451J  ILE*     3.3    17.9    -      -       +      +
    456J  ASP*     3.0    29.7    +      -       -      +
    457J  LYS*     3.8    15.4    -      -       -      +
    458J  HIS*     3.8    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 446 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442J  ASP*     2.9    29.2    +      -       +      +
    443J  ARG*     3.4    25.5    +      -       -      +
    445J  ARG*     1.3    73.9    -      -       +      +
    447J  ARG*     1.3    65.5    +      -       -      +
    448J  GLY*     2.9    11.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 447 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308J  PHE*     4.0     8.2    -      -       +      -
    312J  THR*     4.1    16.7    -      -       +      +
    443J  ARG*     3.0    66.3    +      -       -      +
    444J  GLU      3.7     0.9    -      -       -      +
    445J  ARG      3.4     0.2    -      -       -      -
    446J  GLU*     1.3    82.4    +      -       -      +
    448J  GLY*     1.3    58.6    +      -       -      +
    449J  MET*     3.1    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 448 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444J  GLU      3.0     2.6    +      -       -      -
    445J  ARG*     3.1    11.2    +      -       -      -
    446J  GLU      2.9     6.9    +      -       -      -
    447J  ARG*     1.3    78.7    -      -       -      +
    449J  MET*     1.3    63.5    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il