Contacts of the helix formed by residues 422 - 448 (chain G) 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 G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199G  TRP*     4.9     3.4    -      -       +      -
    200G  GLY*     3.8    24.5    -      -       -      +
    420G  THR      4.7     0.7    -      -       -      +
    421G  LYS*     1.3    87.3    -      -       +      +
    423G  LEU*     1.3    67.5    -      -       -      +
    424G  GLN*     3.2     5.6    -      -       +      +
    425G  LEU*     2.8    34.2    +      -       +      +
    426G  TYR      3.0     9.7    +      -       -      -
    495G  THR*     4.6     7.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 423 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421G  LYS      3.3     2.0    +      -       -      -
    422G  PRO*     1.3    70.0    -      -       -      +
    424G  GLN*     1.3    63.9    +      -       -      +
    426G  TYR*     4.1    13.2    -      -       +      -
    427G  ARG*     2.9    51.4    +      -       +      +
    495G  THR*     5.4     0.4    -      -       -      +
    499G  ASN*     3.5    31.2    +      -       +      +
    502G  TRP*     3.6    55.4    -      -       +      +
    503G  TYR*     4.6     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 424 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202G  HIS*     3.1    34.2    +      -       -      -
    205G  ARG*     4.5     7.4    +      -       -      +
    422G  PRO*     3.0     5.4    +      -       +      +
    423G  LEU*     1.3    78.5    -      -       -      +
    425G  LEU*     1.3    62.5    +      -       +      +
    427G  ARG*     3.9     7.6    +      -       -      +
    428G  GLN*     3.2    38.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 425 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200G  GLY*     3.5    26.9    -      -       -      +
    201G  LEU      3.9    10.8    -      -       -      +
    202G  HIS*     4.1    28.0    -      -       +      +
    203G  VAL*     4.7     4.9    -      -       +      +
    204G  PHE*     3.8    25.7    -      -       +      -
    421G  LYS*     4.2    13.0    -      -       +      -
    422G  PRO*     2.8    32.5    +      -       +      +
    424G  GLN*     1.3    76.7    -      -       +      +
    426G  TYR*     1.3    67.0    +      -       -      +
    428G  GLN*     2.8    19.5    +      -       -      +
    429G  TRP*     3.1    21.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 426 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    418G  ASN*     3.5    26.1    +      -       +      +
    419G  PRO*     3.5    23.9    -      -       +      +
    421G  LYS*     4.2     2.7    -      -       -      +
    422G  PRO      3.0     8.1    +      -       -      +
    423G  LEU*     3.6    12.6    -      -       +      +
    425G  LEU*     1.3    78.1    -      -       -      +
    427G  ARG*     1.3    58.5    +      -       -      +
    429G  TRP*     3.0     9.0    +      -       -      +
    430G  THR*     2.9    40.5    +      -       -      -
    466G  GLN*     2.7    29.8    +      -       -      +
    470G  ILE*     3.4    21.2    -      -       +      +
    499G  ASN*     3.7    30.1    -      -       +      -
    503G  TYR*     3.5    27.4    -      +       -      -
   3007G  ZAR      3.5    15.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 427 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    423G  LEU*     2.9    50.3    +      -       +      +
    424G  GLN*     4.1     7.4    -      -       -      +
    426G  TYR*     1.3    75.4    -      -       -      +
    428G  GLN*     1.3    63.1    +      -       +      +
    430G  THR*     3.3     2.3    +      -       -      -
    431G  ASP*     3.0    31.4    +      -       -      +
    502G  TRP*     3.1    35.6    -      -       +      -
    503G  TYR*     3.7    19.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 428 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202G  HIS*     3.8    12.1    +      -       -      -
    204G  PHE*     3.4    39.1    -      -       +      +
    424G  GLN*     3.2    45.2    +      -       +      +
    425G  LEU*     2.8     8.6    +      -       -      +
    427G  ARG*     1.3    77.8    -      -       +      +
    429G  TRP*     1.3    62.9    +      -       -      +
    431G  ASP*     3.2    12.0    +      -       -      +
    432G  ARG*     3.0    29.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 429 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203G  VAL*     4.0    11.2    -      -       +      +
    204G  PHE*     3.5    31.8    -      +       -      -
    255G  ALA      5.6     0.2    -      -       -      -
    256G  TYR*     3.6    27.9    -      +       +      -
    258G  ASN*     5.3     0.7    -      -       -      -
    260G  ILE*     3.8    11.9    -      -       +      -
    261G  HIS*     3.7    37.5    -      -       +      -
    264G  ASP*     3.4    30.1    +      -       +      -
    418G  ASN*     3.5    41.1    -      -       +      +
    421G  LYS*     5.4     4.5    -      -       +      +
    425G  LEU*     3.1    33.5    +      -       +      +
    426G  TYR*     3.0     6.8    +      -       -      +
    428G  GLN*     1.3    74.2    -      -       -      +
    430G  THR*     1.3    60.8    -      -       -      +
    432G  ARG*     3.0    14.1    +      -       -      +
    433G  ILE*     2.8    27.4    +      -       -      +
   3007G  ZAR      3.3     8.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 430 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426G  TYR*     2.9    32.6    +      -       -      -
    427G  ARG      3.6     4.0    -      -       -      -
    428G  GLN      3.3     0.2    -      -       -      -
    429G  TRP*     1.3    74.3    -      -       -      +
    431G  ASP*     1.3    66.2    +      -       -      +
    433G  ILE*     3.1     4.0    -      -       -      +
    434G  MET*     3.1    23.6    +      -       +      +
    462G  VAL*     3.8    19.3    -      -       +      -
    466G  GLN*     3.4    28.2    -      -       +      +
    503G  TYR*     3.2    27.1    +      -       -      +
   3007G  ZAR      3.3    10.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 431 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    427G  ARG*     3.0    22.6    +      -       -      +
    428G  GLN*     3.5    10.8    -      -       -      +
    429G  TRP      3.1     0.2    -      -       -      -
    430G  THR*     1.3    79.6    -      -       -      +
    432G  ARG*     1.3    59.5    +      -       +      +
    434G  MET*     3.8     5.4    -      -       -      +
    435G  GLU*     2.9    30.8    +      -       -      +
    462G  VAL*     5.7     2.9    -      -       -      +
    503G  TYR*     5.5     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 432 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204G  PHE*     3.1    35.3    -      -       -      -
    255G  ALA*     2.8    55.2    +      -       +      +
    256G  TYR*     4.0     7.6    -      -       +      -
    258G  ASN*     4.0     8.7    -      -       -      +
    260G  ILE*     3.7    21.6    -      -       -      +
    428G  GLN*     3.0    19.7    +      -       -      +
    429G  TRP*     3.0    20.6    +      -       -      +
    431G  ASP*     1.3    74.8    -      -       +      +
    433G  ILE*     1.3    64.4    +      -       -      +
    435G  GLU*     3.1    10.9    +      -       -      +
    436G  GLU*     2.9    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 433 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256G  TYR*     3.6    36.7    -      -       +      -
    257G  HIS*     3.9    13.0    -      -       +      -
    429G  TRP      2.8    13.5    +      -       -      +
    430G  THR*     3.1    17.3    -      -       -      +
    432G  ARG*     1.3    73.7    -      -       -      +
    434G  MET*     1.3    71.7    +      -       +      +
    436G  GLU*     3.2     3.1    +      -       +      +
    437G  PHE*     2.9    65.2    +      -       +      -
    466G  GLN*     4.6     1.1    -      -       -      +
   3007G  ZAR      3.5    46.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 434 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    430G  THR*     3.1    19.7    +      -       +      +
    431G  ASP*     3.9     4.5    -      -       -      +
    433G  ILE*     1.3    84.4    -      -       +      +
    435G  GLU*     1.3    64.9    +      -       -      +
    437G  PHE*     3.9     7.7    -      -       +      +
    438G  PHE*     3.0    66.2    +      -       +      -
    454G  MET*     3.6    45.5    -      -       +      +
    460G  ALA*     4.1     6.7    -      -       +      -
    462G  VAL*     3.9    39.5    -      -       +      -
    465G  SER*     5.2     1.1    -      -       -      +
    466G  GLN*     4.8     4.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 435 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255G  ALA*     3.7    19.6    -      -       +      +
    431G  ASP      2.9    19.5    +      -       -      +
    432G  ARG*     3.1    11.1    +      -       -      +
    434G  MET*     1.3    79.1    -      -       -      +
    436G  GLU*     1.3    51.2    +      -       -      +
    438G  PHE*     4.4     6.0    -      -       -      +
    439G  PRO*     2.5    33.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 436 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254G  VAL*     3.2    13.7    -      -       +      +
    255G  ALA*     4.1     9.0    -      -       +      +
    256G  TYR*     2.7    31.9    +      -       -      +
    257G  HIS*     2.7    37.3    +      -       -      -
    301G  HIS*     4.1     0.5    -      -       -      -
    303G  GLY*     3.3    35.6    -      -       -      +
    432G  ARG      2.9    13.4    +      -       -      +
    433G  ILE*     3.6     7.4    -      -       -      +
    434G  MET      3.1     0.2    -      -       -      -
    435G  GLU*     1.3    76.9    -      -       -      +
    437G  PHE*     1.3    68.9    +      -       +      +
    438G  PHE      3.3     0.4    -      -       -      -
    439G  PRO*     3.0    13.6    -      -       -      +
    440G  GLN*     3.5    10.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 437 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257G  HIS*     5.3     4.7    -      +       -      -
    433G  ILE*     2.9    50.4    +      -       +      +
    434G  MET*     3.4    12.3    +      -       -      +
    436G  GLU*     1.3    83.2    -      -       +      +
    438G  PHE*     1.3    57.6    +      -       -      +
    440G  GLN*     3.1    11.8    +      -       -      +
    441G  GLY      2.9    22.2    +      -       -      -
    454G  MET*     3.7    48.2    -      -       +      +
    455G  CYS*     3.2    34.3    -      -       -      +
   3007G  ZAR      4.0    30.1    -      +       -      -
----------------------------------------------------------
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Residues in contact with PHE 438 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434G  MET*     3.0    44.3    +      -       +      +
    435G  GLU*     4.4     4.9    -      -       -      +
    437G  PHE*     1.3    77.0    -      -       -      +
    439G  PRO*     1.3    57.4    -      -       +      +
    441G  GLY*     2.9     3.5    +      -       -      -
    442G  ASP*     2.7    42.1    +      -       -      +
    454G  MET      3.4    19.3    -      -       -      -
    455G  CYS      3.5     9.2    -      -       -      +
    457G  LYS*     3.5    49.4    -      -       +      -
    460G  ALA*     3.6    21.8    -      -       +      -
    462G  VAL*     4.8     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 439 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    435G  GLU*     2.5    33.0    -      -       +      +
    436G  GLU*     3.0    12.3    -      -       -      +
    438G  PHE*     1.3    88.1    -      -       +      +
    440G  GLN*     1.3    55.6    +      -       -      +
    442G  ASP*     3.3    15.5    +      -       +      +
    443G  ARG*     2.8    35.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 440 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303G  GLY      4.0     3.4    -      -       -      +
    304G  VAL*     3.2    17.7    -      -       +      -
    305G  SER*     3.0    45.6    +      -       -      -
    308G  PHE*     3.7    20.6    -      -       +      +
    436G  GLU      3.5     9.3    +      -       -      +
    437G  PHE*     3.1    15.9    +      -       -      +
    438G  PHE      3.0     0.4    -      -       -      -
    439G  PRO*     1.3    78.0    -      -       -      +
    441G  GLY*     1.3    59.9    +      -       -      +
    443G  ARG*     3.1     9.3    +      -       -      +
    444G  GLU*     2.8    53.2    +      -       -      +
    452G  SER*     3.8     9.3    +      -       -      -
    455G  CYS*     4.1    13.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 441 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437G  PHE      2.9     7.7    +      -       -      -
    438G  PHE      2.9     3.6    +      -       -      -
    440G  GLN*     1.3    77.6    -      -       -      +
    442G  ASP*     1.3    57.7    +      -       -      +
    444G  GLU*     3.3    13.9    +      -       -      -
    445G  ARG*     2.9    27.6    +      -       -      +
    451G  ILE*     3.1    15.8    -      -       -      +
    455G  CYS*     3.2    26.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 442 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    438G  PHE*     2.7    22.2    +      -       -      +
    439G  PRO*     3.5    16.2    -      -       +      +
    441G  GLY*     1.3    71.3    -      -       -      +
    443G  ARG*     1.3    64.8    +      -       -      +
    445G  ARG*     2.8    45.2    +      -       -      +
    446G  GLU*     2.9    26.1    +      -       +      +
    457G  LYS*     3.1    37.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 443 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302G  PRO      5.3     3.6    +      -       -      -
    304G  VAL*     3.8    18.6    -      -       -      +
    308G  PHE*     3.3    35.2    -      -       +      -
    439G  PRO*     2.8    26.6    +      -       +      +
    440G  GLN*     3.2    12.1    -      -       -      +
    442G  ASP*     1.3    76.5    -      -       -      +
    444G  GLU*     1.3    55.9    +      -       -      +
    446G  GLU*     3.4    19.2    +      -       -      +
    447G  ARG*     3.0    62.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 444 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308G  PHE*     3.6    24.1    -      -       +      +
    311G  ASN*     5.7     1.2    +      -       -      -
    440G  GLN*     2.8    33.0    +      -       -      +
    441G  GLY*     3.6    14.6    -      -       -      +
    442G  ASP      3.1     0.2    -      -       -      -
    443G  ARG*     1.3    75.7    -      -       -      +
    445G  ARG*     1.3    62.0    +      -       -      +
    447G  ARG*     3.4     2.8    +      -       -      -
    448G  GLY      3.0     2.6    +      -       -      -
    449G  MET*     2.8    54.3    +      -       +      +
    450G  GLU      4.1     5.6    -      -       -      +
    451G  ILE*     3.7     9.9    -      -       +      -
    452G  SER*     2.6    51.3    +      -       -      -
    455G  CYS*     4.2     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 445 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    441G  GLY      2.9    15.7    +      -       -      +
    442G  ASP*     2.8    39.6    +      -       -      +
    444G  GLU*     1.3    76.2    -      -       -      +
    446G  GLU*     1.3    65.1    +      -       +      +
    448G  GLY*     3.1    12.0    +      -       -      -
    449G  MET      4.6     1.8    -      -       -      -
    451G  ILE*     3.3    17.5    -      -       +      +
    456G  ASP*     3.0    28.5    +      -       -      +
    457G  LYS*     3.8    15.6    -      -       -      +
    458G  HIS*     3.7    26.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 446 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442G  ASP*     2.9    28.3    +      -       +      +
    443G  ARG*     3.4    26.3    +      -       -      +
    445G  ARG*     1.3    74.5    -      -       +      +
    447G  ARG*     1.3    70.1    +      -       -      +
    448G  GLY*     2.9     7.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 447 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308G  PHE*     4.1     7.3    -      -       +      -
    312G  THR*     4.1    17.3    -      -       +      +
    443G  ARG*     3.0    62.3    +      -       -      +
    444G  GLU      3.7     1.1    -      -       -      +
    446G  GLU*     1.3    84.3    +      -       -      +
    448G  GLY*     1.3    58.8    +      -       -      +
    449G  MET*     3.1    38.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 448 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444G  GLU      3.0     2.8    +      -       -      -
    445G  ARG      3.1    11.2    +      -       -      -
    446G  GLU      2.9     7.3    +      -       -      -
    447G  ARG*     1.3    78.9    -      -       -      +
    449G  MET*     1.3    64.7    +      -       -      +
----------------------------------------------------------
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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