Contacts of the helix formed by residues 91 - 112 (chain B) in PDB entry 1UDY


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 CYS 91 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35B  ILE*     3.9     4.3    -      -       +      +
     39B  ALA*     3.7    20.4    -      -       +      -
     87B  LEU      3.3     5.0    +      -       -      +
     88B  ALA      3.1     5.2    +      -       -      -
     90B  GLY*     1.3    81.1    -      -       -      +
     92B  THR*     1.3    58.2    +      -       -      +
     93B  GLY*     3.0    20.9    -      -       -      -
     94B  VAL*     3.6    27.5    -      -       +      +
     95B  GLN*     3.1    26.5    +      -       -      +
    217B  GLN*     6.1     0.2    -      -       -      -
    219B  CYS*     4.5     6.1    -      -       -      -
    364B  LYS*     3.3    29.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 92 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  ALA*     3.6    26.9    +      -       +      +
     91B  CYS*     1.3    70.7    -      -       -      +
     93B  GLY*     1.3    61.4    +      -       -      +
     95B  GLN*     3.9     7.9    -      -       -      -
     96B  THR*     2.6    35.3    +      -       -      -
    217B  GLN*     3.4     9.7    +      -       -      +
    266B  LEU*     3.8    27.1    -      -       +      +
    364B  LYS*     4.8     1.4    -      -       -      +
    368B  ASP*     3.3    30.3    +      -       -      +
    372B  TYR*     3.4    28.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 93 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  CYS*     3.0    12.5    -      -       -      -
     92B  THR*     1.3    81.1    +      -       -      +
     94B  VAL*     1.3    65.1    +      -       -      +
     96B  THR*     3.8     0.3    -      -       -      -
     97B  ALA*     3.4    13.9    +      -       -      +
    217B  GLN*     3.9    27.5    -      -       -      +
    219B  CYS*     3.7    12.9    -      -       -      -
    220B  SER*     3.8    13.2    -      -       -      -
    364B  LYS*     5.2     0.6    -      -       -      +
    368B  ASP*     5.3     0.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 94 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  PHE*     5.8     0.9    -      -       +      -
     35B  ILE*     4.1    19.5    -      -       +      -
     39B  ALA*     5.5     3.6    -      -       +      -
     42B  TYR*     5.7     1.8    -      -       +      -
     49B  PRO*     4.3    11.0    -      -       +      -
     52B  LEU*     4.0    40.8    -      -       +      -
     53B  LEU*     4.8     5.6    -      -       +      -
     91B  CYS*     3.5    26.8    +      -       +      +
     93B  GLY*     1.3    75.3    -      -       -      +
     95B  GLN*     1.3    57.6    +      -       -      +
     97B  ALA*     3.0    29.8    +      -       -      +
     98B  ILE*     3.2    17.1    +      -       +      +
    219B  CYS*     3.7    14.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 95 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35B  ILE*     6.1     0.6    -      -       -      +
     84B  THR*     2.8    30.4    -      -       +      +
     87B  LEU*     3.5    30.9    -      -       +      +
     88B  ALA*     3.6    17.8    -      -       -      +
     91B  CYS      3.1    16.6    +      -       -      +
     92B  THR*     4.0     3.4    +      -       -      +
     94B  VAL*     1.3    80.3    -      -       -      +
     96B  THR*     1.3    72.1    +      -       -      +
     98B  ILE*     3.1    13.5    +      -       -      +
     99B  GLU*     2.9    42.7    +      -       +      +
    262B  GLY*     4.7     1.2    -      -       -      -
    372B  TYR*     4.0    15.0    +      -       -      -
   1400B  CS8      4.2     8.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 96 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  THR      2.6    24.2    +      -       -      -
     93B  GLY*     3.8     4.3    -      -       -      -
     94B  VAL      3.3     0.2    -      -       -      -
     95B  GLN*     1.3    84.3    +      -       -      +
     97B  ALA*     1.3    65.9    +      -       -      +
     99B  GLU      4.4     0.7    -      -       -      +
    100B  ALA*     2.9    23.0    +      -       -      +
    168B  THR*     4.4    14.4    -      -       +      +
    217B  GLN*     3.0    25.3    +      -       -      +
    220B  SER*     4.4     6.1    -      -       -      +
    372B  TYR*     4.3     0.2    +      -       -      -
    375B  TYR*     3.4    14.5    +      -       +      +
   1399B  FAD      5.8     0.9    -      -       +      -
   1400B  CS8      3.5    30.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 97 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  TYR*     4.3    14.4    -      -       +      +
     49B  PRO*     5.4     3.6    -      -       +      -
     53B  LEU*     4.0    18.2    -      -       +      -
     93B  GLY      3.4     6.6    +      -       -      +
     94B  VAL*     3.0    16.0    +      -       -      +
     96B  THR*     1.3    79.2    -      -       -      +
     98B  ILE*     1.3    64.7    -      -       -      +
    100B  ALA*     3.4     4.8    +      -       -      +
    101B  ASN*     3.7     4.0    +      -       -      +
    130B  MET*     5.2     2.0    -      -       -      +
    168B  THR*     4.7     3.1    -      -       -      -
    169B  ASN*     3.0    38.2    -      -       -      +
    220B  SER*     4.8     7.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  PHE*     5.1     3.6    -      -       +      -
     35B  ILE*     6.0     0.2    -      -       +      -
     53B  LEU*     3.7    12.3    -      -       +      -
     56B  ALA*     3.9    15.3    -      -       +      -
     61B  LEU      3.9    17.0    -      -       -      +
     62B  MET*     3.5    38.7    -      -       +      +
     63B  ASN      5.5     0.7    -      -       -      +
     87B  LEU*     3.6    31.2    -      -       +      -
     94B  VAL*     3.2    17.2    +      -       +      +
     95B  GLN*     3.1    10.2    +      -       -      +
     97B  ALA*     1.3    77.5    -      -       -      +
     99B  GLU*     1.3    66.6    +      -       +      +
    101B  ASN*     3.1    28.8    -      -       -      +
    102B  THR*     3.9     5.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  THR*     5.5     2.1    -      -       -      +
     80B  SER*     4.0    10.0    +      -       -      -
     84B  THR*     3.3    20.0    +      -       +      +
     87B  LEU*     6.1     0.6    -      -       +      +
     95B  GLN*     2.9    39.5    +      -       -      +
     96B  THR      3.4     0.2    +      -       -      -
     98B  ILE*     1.3    75.2    -      -       +      +
    100B  ALA*     1.3    62.2    +      -       -      +
    101B  ASN      2.8     6.8    +      -       -      -
    102B  THR*     3.0    34.9    +      -       -      +
    103B  LEU*     3.1    33.7    +      -       +      +
    258B  PRO*     4.2    17.4    -      -       +      +
    259B  VAL*     6.0     0.2    -      -       -      +
   1400B  CS8      3.4    30.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  THR      2.9    17.0    +      -       -      +
     98B  ILE      3.3     0.4    -      -       -      -
     99B  GLU*     1.3    75.8    -      -       -      +
    101B  ASN*     1.3    62.0    +      -       -      +
    103B  LEU*     3.8     8.5    -      -       -      +
    104B  GLY*     3.3    13.5    +      -       -      -
    131B  CYS      3.7    10.9    -      -       -      +
    132B  ALA*     4.4     3.8    -      -       -      -
    133B  TYR*     4.7     2.5    +      -       +      +
    168B  THR*     3.5    33.0    -      -       +      +
    169B  ASN*     3.5    17.5    -      -       +      +
   1399B  FAD      5.3     1.6    -      -       -      +
   1400B  CS8      3.9     9.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  MET*     4.0    15.3    -      -       +      +
     63B  ASN*     2.7    29.3    +      -       -      +
     97B  ALA      3.7     2.8    +      -       -      -
     98B  ILE*     3.1    16.3    +      -       -      +
     99B  GLU      2.8     1.4    -      -       -      -
    100B  ALA*     1.3    76.8    -      -       -      +
    102B  THR*     1.3    62.1    +      -       +      +
    103B  LEU      3.0     1.1    -      -       -      -
    104B  GLY      2.9    18.5    +      -       -      -
    105B  GLN*     3.0    13.5    +      -       -      +
    124B  MET*     4.2     1.2    -      -       -      +
    129B  LEU      3.4    18.8    +      -       -      -
    130B  MET*     3.3    13.4    -      -       -      +
    131B  CYS*     2.8    42.7    +      -       -      +
    169B  ASN*     4.2     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  ASN*     4.6    15.7    -      -       -      +
     64B  THR*     4.8    13.5    -      -       +      +
     65B  HIS*     4.8    12.3    -      -       +      -
     80B  SER*     5.7     1.3    +      -       -      +
     98B  ILE*     4.2    10.8    -      -       +      +
     99B  GLU*     3.0    34.3    +      -       -      +
    101B  ASN*     1.3    74.8    -      -       -      +
    103B  LEU*     1.3    61.9    +      -       -      +
    105B  GLN*     3.7    19.3    -      -       -      +
    106B  VAL*     2.9    39.7    +      -       -      +
    255B  THR*     5.9     1.4    -      -       -      -
    258B  PRO*     6.1     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  GLU*     3.1    37.8    +      -       -      +
    100B  ALA*     3.8     8.1    -      -       -      +
    101B  ASN      3.0     0.8    -      -       -      -
    102B  THR*     1.3    82.9    +      -       -      +
    104B  GLY*     1.3    60.4    +      -       -      +
    106B  VAL*     4.9     2.7    -      -       -      -
    107B  PRO*     3.0    20.1    -      -       -      +
    133B  TYR*     3.4    30.7    -      -       +      -
    251B  THR*     4.6     4.5    -      -       +      +
    252B  PHE*     6.2     0.2    -      -       +      -
    255B  THR*     4.0    25.8    -      -       +      +
    259B  VAL*     5.1     0.9    -      -       +      -
    376B  GLU*     3.2    26.5    -      -       -      +
   1400B  CS8      3.3    43.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  ALA      3.3     5.8    +      -       -      -
    101B  ASN      2.9     7.4    +      -       -      -
    103B  LEU*     1.3    79.6    -      -       -      +
    105B  GLN*     1.3    59.7    +      -       -      +
    107B  PRO*     3.3    12.2    -      -       -      +
    108B  LEU*     4.5     1.6    +      -       -      +
    131B  CYS*     4.1     8.7    -      -       -      -
    132B  ALA      4.2    20.0    -      -       -      -
    133B  TYR*     4.4     3.3    -      -       -      +
    175B  TRP*     3.2    24.3    -      -       -      -
    177B  PHE*     3.9     8.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  ASN*     2.7    39.3    +      -       -      +
     65B  HIS*     5.1     3.0    -      -       +      +
     66B  ILE*     3.6    32.3    -      -       +      +
    101B  ASN*     3.0    16.1    +      -       -      +
    102B  THR*     3.7    17.4    -      -       -      +
    104B  GLY*     1.3    75.2    -      -       -      +
    106B  VAL*     1.3    55.8    +      -       +      +
    107B  PRO*     3.2     2.9    -      -       -      -
    108B  LEU*     2.7    30.0    +      -       -      +
    109B  ILE*     2.9    20.0    +      -       +      +
    121B  LEU*     4.7     5.3    -      -       +      +
    124B  MET*     3.9    14.2    -      -       +      +
    131B  CYS*     3.7     9.6    -      -       -      -
    175B  TRP*     3.8    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  HIS*     4.0    24.0    -      -       +      +
    102B  THR*     2.9    35.2    +      -       -      +
    103B  LEU*     4.9     0.9    -      -       -      -
    105B  GLN*     1.3    71.1    -      -       -      +
    107B  PRO*     1.3    66.2    -      -       +      +
    108B  LEU      3.0     0.2    +      -       -      -
    109B  ILE*     3.0     8.2    +      -       +      -
    110B  ILE*     2.8    52.9    +      -       +      +
    251B  THR*     3.9    25.8    -      -       +      -
    254B  LYS*     4.3    20.2    -      -       +      -
    255B  THR*     5.8     4.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  LEU      3.0    24.5    -      -       -      +
    104B  GLY      3.3     7.9    -      -       -      +
    105B  GLN      3.3     4.3    -      -       -      -
    106B  VAL*     1.3    92.5    -      -       +      +
    108B  LEU*     1.3    53.6    +      -       -      +
    110B  ILE*     4.1     3.6    -      -       +      -
    111B  GLY*     3.1    23.1    +      -       -      -
    133B  TYR*     4.0     9.2    -      -       +      -
    177B  PHE*     3.4    40.6    -      -       +      -
    238B  LEU*     3.7     8.8    -      -       -      +
    247B  ILE*     3.6    19.3    -      -       +      +
    251B  THR*     3.7    15.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104B  GLY      4.5     2.6    +      -       -      +
    105B  GLN*     2.7    20.0    +      -       -      +
    107B  PRO*     1.3    73.7    -      -       -      +
    109B  ILE*     1.3    63.3    +      -       -      +
    110B  ILE      3.3     0.2    -      -       -      -
    112B  GLY*     2.7    27.0    +      -       -      +
    116B  GLN*     3.6    13.2    -      -       +      +
    117B  GLN*     3.0    55.2    -      -       +      +
    120B  TYR*     4.9     2.7    -      -       +      -
    121B  LEU*     3.3    22.4    -      -       +      -
    175B  TRP*     4.8     9.0    -      -       +      -
    177B  PHE*     5.8     2.7    -      -       +      -
    198B  ILE*     4.0    26.0    -      -       +      -
    238B  LEU*     3.3    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  HIS*     3.3    55.2    -      -       +      +
     66B  ILE*     4.2     3.4    -      -       -      +
     67B  PRO*     4.0    17.7    -      -       +      -
    105B  GLN*     2.9    22.6    +      -       +      +
    106B  VAL*     3.6     9.6    -      -       -      +
    108B  LEU*     1.3    76.5    -      -       -      +
    110B  ILE*     1.3    66.5    +      -       +      +
    112B  GLY      4.6     0.2    -      -       -      +
    117B  GLN*     3.0    22.6    -      -       -      +
    121B  LEU*     3.8    17.2    -      -       +      +
    254B  LYS*     5.0     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  HIS*     6.2     0.2    -      -       -      +
    106B  VAL*     2.8    33.0    +      -       +      +
    107B  PRO*     4.1     4.7    -      -       +      +
    109B  ILE*     1.3    77.1    -      -       +      +
    111B  GLY*     1.3    64.8    +      -       -      +
    239B  THR*     4.9     1.4    -      -       -      +
    246B  LYS      5.3     0.2    -      -       -      +
    247B  ILE*     3.6    28.0    -      -       +      +
    250B  GLY*     3.9    10.8    -      -       -      +
    251B  THR*     3.9    23.6    -      -       -      +
    254B  LYS*     3.7    29.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  PRO      3.1    18.1    +      -       -      -
    110B  ILE*     1.3    84.1    -      -       -      +
    112B  GLY*     1.3    61.1    +      -       -      +
    113B  ASN      4.1     0.3    +      -       -      -
    238B  LEU*     4.1     4.5    -      -       -      -
    239B  THR*     2.6    45.0    +      -       -      +
    247B  ILE*     4.5     8.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  PRO      3.8     1.8    +      -       -      -
    108B  LEU*     2.7    27.7    +      -       -      -
    109B  ILE      4.6     0.3    -      -       -      +
    110B  ILE      5.3     0.3    -      -       -      -
    111B  GLY*     1.3    73.8    -      -       -      -
    113B  ASN*     1.3    62.8    +      -       -      -
    116B  GLN*     3.1    13.9    -      -       -      -
    117B  GLN*     2.8    23.4    -      -       -      +
    238B  LEU*     3.9     9.0    -      -       -      -
----------------------------------------------------------
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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