Contacts of the helix formed by residues 83 - 110 (chain A) in PDB entry 5GUF


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 MET 83 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  ALA*     3.4    39.3    -      -       +      +
     78A  LEU*     3.9    22.0    -      -       +      -
     81A  GLY*     3.6    11.2    +      -       -      +
     82A  ASN*     1.3    72.4    +      -       -      +
     84A  LEU*     1.3    63.1    +      -       -      +
     85A  LEU      3.1     0.4    -      -       -      -
     86A  ALA*     3.0    23.2    +      -       -      +
     87A  VAL*     3.8     6.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 84 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  TRP*     3.8    30.7    -      -       +      +
     82A  ASN*     2.8    17.9    +      -       -      +
     83A  MET*     1.3    77.5    -      -       -      +
     85A  LEU*     1.3    57.6    +      -       -      +
     87A  VAL*     2.9    23.4    +      -       +      +
     88A  HIS*     2.8    51.2    +      -       +      +
    139A  TYR*     5.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 85 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  VAL*     3.9    16.4    -      -       +      -
     19A  ILE*     3.9    17.5    -      -       +      +
     20A  LEU*     4.1    11.7    -      -       +      -
     73A  GLY      3.8     3.0    -      -       -      +
     76A  ALA*     3.5    25.4    -      -       +      +
     77A  ALA*     3.7    10.8    -      -       -      +
     80A  SER*     3.4    20.4    -      -       -      +
     82A  ASN*     3.0    30.8    +      -       +      +
     84A  LEU*     1.3    77.0    -      -       -      +
     86A  ALA*     1.3    55.6    +      -       -      +
     88A  HIS*     4.4     3.6    -      -       +      +
     89A  SER*     2.6    38.4    +      -       -      +
    139A  TYR*     3.6    24.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 86 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  SER      5.4     2.1    -      -       -      +
     73A  GLY      3.8    11.4    -      -       -      +
     74A  VAL*     4.6    16.2    -      -       +      +
     77A  ALA*     3.6    14.7    -      -       +      +
     83A  MET*     3.0    16.2    +      -       -      +
     85A  LEU*     1.3    79.9    -      -       -      +
     87A  VAL*     1.3    60.8    +      -       +      +
     90A  PRO*     3.3    20.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 87 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  MET      4.4     8.1    -      -       -      +
     84A  LEU*     2.9    23.9    +      -       +      +
     86A  ALA*     1.3    82.1    -      -       +      +
     88A  HIS*     1.3    72.1    +      -       +      +
     90A  PRO*     3.3    12.6    -      -       -      +
     91A  ALA*     4.6     4.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 88 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  TRP*     3.5    29.6    -      +       -      -
     20A  LEU*     5.6     0.9    -      -       +      -
     84A  LEU*     2.8    42.3    +      -       +      +
     85A  LEU*     4.4     4.0    -      -       +      +
     87A  VAL*     1.3    84.6    -      -       +      +
     89A  SER*     1.3    65.0    +      -       -      +
     91A  ALA*     3.0     8.8    +      -       -      +
     92A  ILE*     3.0    28.6    +      -       +      +
    137A  LEU*     3.6    35.8    +      -       +      +
    139A  TYR*     2.7    34.8    +      +       -      +
----------------------------------------------------------
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Residues in contact with SER 89 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     5.1     2.6    +      -       -      +
     23A  PRO*     3.3    23.0    -      -       -      +
     69A  GLY      4.0     4.0    -      -       -      -
     70A  SER      5.2     0.2    -      -       -      -
     73A  GLY*     3.2    28.6    -      -       -      -
     76A  ALA*     4.7     0.7    -      -       -      +
     85A  LEU*     2.6    28.5    +      -       -      +
     88A  HIS*     1.3    78.7    -      -       -      +
     90A  PRO*     1.3    61.5    -      -       -      +
     92A  ILE*     3.7     9.7    -      -       -      +
     93A  ALA*     2.7    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 90 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  PHE*     3.6    20.9    -      -       +      -
     70A  SER*     3.9    29.8    -      -       -      +
     86A  ALA      3.3    22.7    -      -       -      +
     87A  VAL*     3.3    12.1    -      -       -      +
     89A  SER*     1.3    92.0    -      -       -      +
     91A  ALA*     1.3    62.5    +      -       -      +
     93A  ALA*     3.3     5.9    +      -       +      +
     94A  LEU*     2.9    26.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     87A  VAL      4.6     2.8    +      -       -      +
     88A  HIS*     3.0    11.4    +      -       -      +
     90A  PRO*     1.3    78.8    -      -       -      +
     92A  ILE*     1.3    57.4    +      -       -      +
     94A  LEU*     3.1    14.9    +      -       -      +
     95A  GLY      3.0    22.5    +      -       -      -
    133A  VAL*     3.5    21.7    -      -       +      +
    137A  LEU*     4.5    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 92 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.8    39.9    -      -       +      +
     21A  MET*     4.1     8.5    -      -       +      -
     23A  PRO*     5.4     0.7    -      -       +      -
     24A  ALA*     4.0    13.7    -      -       +      +
     88A  HIS*     3.0    23.2    +      -       +      +
     89A  SER*     3.7    11.2    -      -       -      +
     91A  ALA*     1.3    72.3    -      -       -      +
     93A  ALA*     1.3    61.2    +      -       -      +
     95A  GLY*     3.1     2.4    +      -       -      -
     96A  ALA*     2.8    27.2    +      -       -      +
    130A  ALA*     3.7    22.9    -      -       +      +
    133A  VAL*     4.0    11.2    -      -       +      -
    134A  SER*     4.1    19.1    -      -       -      +
    137A  LEU*     4.0    16.8    -      -       +      -
    139A  TYR*     5.1     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  PRO      4.6     1.1    -      -       -      +
     24A  ALA*     4.7     4.0    -      -       -      +
     27A  ALA*     3.9    23.7    -      -       +      +
     65A  GLY      4.7     2.2    -      -       -      +
     66A  PHE*     4.5    11.0    -      -       +      -
     69A  GLY*     4.1    16.8    -      -       -      -
     89A  SER      2.7    21.1    +      -       -      +
     90A  PRO*     3.4     9.0    -      -       +      +
     92A  ILE*     1.3    74.1    -      -       -      +
     94A  LEU*     1.3    56.9    +      -       -      +
     96A  ALA*     3.2     4.6    +      -       -      +
     97A  LEU*     2.9    34.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  PHE*     3.6    35.4    -      -       +      -
     90A  PRO      2.9    16.2    +      -       -      +
     91A  ALA*     3.1    14.8    +      -       -      +
     93A  ALA*     1.3    73.8    -      -       -      +
     95A  GLY*     1.3    58.9    +      -       -      +
     97A  LEU*     3.1    13.8    +      -       +      +
     98A  ALA*     2.7    32.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91A  ALA      3.0    11.9    +      -       -      -
     92A  ILE      3.1     3.5    +      -       -      -
     94A  LEU*     1.3    75.5    -      -       -      +
     96A  ALA*     1.3    57.5    +      -       -      +
     98A  ALA*     3.8     5.9    -      -       -      +
     99A  GLY      2.9    24.6    +      -       -      -
    129A  GLY*     3.3    21.0    -      -       -      -
    133A  VAL*     3.6    26.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  ALA*     3.6    42.8    -      -       +      +
     27A  ALA*     4.6     3.6    -      -       +      -
     28A  ASN*     5.0     2.7    -      -       -      +
     92A  ILE      2.8     7.6    +      -       -      +
     93A  ALA*     3.2     8.5    +      -       -      +
     95A  GLY*     1.3    75.6    -      -       -      +
     97A  LEU*     1.3    63.3    +      -       -      +
    100A  ASP*     3.1    20.8    +      -       -      +
    126A  PHE*     3.3    32.5    -      -       +      +
    130A  ALA      3.8     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  ALA*     3.6    27.6    -      -       +      +
     28A  ASN*     4.9     2.7    -      -       -      +
     31A  PRO*     4.6    10.1    -      -       +      -
     62A  LEU*     3.5    47.6    -      -       +      +
     65A  GLY*     4.0     6.7    -      -       -      -
     66A  PHE*     3.6    22.7    -      -       +      +
     93A  ALA      2.9    23.2    +      -       -      +
     94A  LEU*     3.7    13.5    -      -       +      +
     96A  ALA*     1.3    77.7    -      -       -      +
     98A  ALA*     1.3    61.8    +      -       -      +
    100A  ASP*     3.4     8.8    +      -       +      +
    101A  MET*     3.1    30.7    +      -       +      +
    201A  CTP      5.1     2.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 98 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     94A  LEU      2.7    22.1    +      -       -      +
     95A  GLY*     3.9     6.5    -      -       -      +
     97A  LEU*     1.3    72.7    -      -       -      +
     99A  GLY*     1.3    53.2    +      -       -      +
    101A  MET*     3.2    16.9    +      -       +      +
    102A  ALA*     2.7    35.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 99 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  GLY      2.9    17.1    +      -       -      -
     96A  ALA      3.9     0.7    -      -       -      -
     98A  ALA*     1.3    75.4    -      -       -      +
    100A  ASP*     1.3    58.3    +      -       -      +
    102A  ALA*     3.7     7.8    -      -       -      +
    103A  GLY      2.9    22.9    +      -       -      -
    125A  ASP*     3.2    31.6    -      -       -      +
    129A  GLY*     4.3     7.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 100 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  ASN*     4.1    18.2    -      -       -      +
     57A  LYS*     2.6    31.9    +      -       -      +
     96A  ALA      3.1    18.1    +      -       -      +
     97A  LEU*     3.8     9.4    -      -       +      +
     99A  GLY*     1.3    75.3    -      -       -      +
    101A  MET*     1.3    62.6    +      -       -      +
    103A  GLY      3.3     0.9    +      -       -      -
    104A  SER*     3.0    21.5    +      -       -      -
    125A  ASP*     3.4    14.5    -      -       -      +
    126A  PHE*     4.0     3.9    -      -       +      +
    201A  CTP      3.3    12.6    +      -       -      -
    205A    K      2.7    28.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 101 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  VAL*     4.1    12.8    -      -       +      -
     53A  LEU*     3.6    28.7    -      -       +      +
     57A  LYS*     4.1    20.4    -      -       +      -
     62A  LEU*     4.0    38.6    -      -       +      -
     97A  LEU*     3.1    19.5    +      -       +      +
     98A  ALA*     3.6    16.2    -      -       +      +
    100A  ASP*     1.3    75.6    -      -       -      +
    102A  ALA*     1.3    59.0    +      -       -      +
    104A  SER*     3.1     7.9    +      -       -      +
    105A  PHE*     2.8    29.8    +      -       -      +
    201A  CTP      4.9     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 102 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  ALA      2.7    20.0    +      -       -      +
     99A  GLY*     3.7     9.6    -      -       -      +
    101A  MET*     1.3    72.9    -      -       -      +
    103A  GLY*     1.3    56.7    +      -       -      +
    105A  PHE*     3.4    10.6    -      -       +      +
    106A  VAL*     3.0    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  GLY      2.9    14.5    +      -       -      -
    100A  ASP      3.3     3.8    +      -       -      -
    101A  MET      3.1     0.2    -      -       -      -
    102A  ALA*     1.3    74.4    -      -       -      +
    104A  SER*     1.3    59.3    +      -       -      +
    106A  VAL*     3.2     5.7    +      -       -      +
    107A  LYS*     2.9    35.9    +      -       -      +
    121A  LEU*     4.0    15.6    -      -       -      +
    125A  ASP*     3.9    17.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  LEU*     3.9    13.5    -      -       -      -
     57A  LYS*     2.9    31.5    +      -       -      -
    100A  ASP      3.0     6.9    +      -       -      -
    101A  MET      3.1     6.9    +      -       -      -
    103A  GLY*     1.3    71.2    -      -       -      +
    105A  PHE*     1.3    67.2    +      -       -      +
    107A  LYS*     3.2     7.1    +      -       -      +
    108A  ARG*     3.0    30.7    +      -       -      +
    125A  ASP*     4.7     0.4    +      -       -      -
    201A  CTP      2.3    34.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  LEU*     4.6     4.5    -      -       +      -
     52A  LEU*     3.5    33.7    -      -       +      -
     53A  LEU*     3.9     9.9    -      -       +      +
    101A  MET      2.8    17.9    +      -       -      +
    102A  ALA*     3.4    15.7    -      -       +      +
    104A  SER*     1.3    73.6    -      -       -      +
    106A  VAL*     1.3    73.0    +      -       +      +
    108A  ARG      3.3     0.2    +      -       -      -
    109A  ARG*     3.1    73.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  ALA*     3.0    20.5    +      -       +      +
    103A  GLY*     3.2     7.1    +      -       -      +
    105A  PHE*     1.3    88.2    -      -       +      +
    107A  LYS*     1.3    63.2    +      -       -      +
    109A  ARG*     3.4     6.5    +      -       -      +
    110A  LEU*     3.2    39.9    +      -       +      +
    121A  LEU*     4.2    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  GLY      2.9    21.6    +      -       -      +
    104A  SER*     3.2     6.5    +      -       -      +
    106A  VAL*     1.3    77.1    -      -       -      +
    108A  ARG*     1.3    76.8    +      -       -      +
    110A  LEU*     3.2     6.9    +      -       -      -
    112A  ILE*     2.8    48.0    +      -       +      +
    116A  ARG      2.8    29.2    +      -       -      +
    118A  ALA*     3.8    15.0    -      -       +      -
    121A  LEU*     4.0    14.4    -      -       +      -
    122A  ASP*     3.0    31.2    +      -       -      +
    201A  CTP      3.0    31.4    +      -       -      +
    202A   MG      4.5     3.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  ARG*     3.3    21.1    -      -       +      +
     51A  ARG*     3.2    28.3    -      -       -      +
     52A  LEU      4.1     1.6    -      -       -      +
     53A  LEU      2.9    31.5    +      -       -      +
     54A  GLY*     4.6     2.5    -      -       -      +
    104A  SER      3.0    21.6    +      -       -      +
    105A  PHE      3.3     0.2    +      -       -      -
    107A  LYS*     1.3    92.0    -      -       -      +
    109A  ARG*     1.3    67.7    +      -       -      +
    111A  GLY*     2.9    17.3    +      -       -      -
    112A  ILE      2.8    30.7    +      -       -      -
    113A  GLU*     3.3     9.3    +      -       -      +
    114A  ARG*     3.6    17.9    -      -       -      +
    201A  CTP      2.7    44.4    +      -       -      -
    204A   MG      3.8    20.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  LEU*     3.7    17.7    -      -       -      +
     48A  ASP*     2.7    37.6    +      -       -      +
     50A  ARG*     3.3    24.4    +      -       -      +
     51A  ARG      2.8    22.0    +      -       -      -
     52A  LEU*     3.2    27.1    +      -       -      +
    105A  PHE*     3.1    60.0    +      -       +      +
    106A  VAL*     3.8     6.5    -      -       -      +
    107A  LYS      3.4     0.4    -      -       -      -
    108A  ARG*     1.3    76.4    -      -       -      +
    110A  LEU*     1.3    63.0    +      -       +      +
    111A  GLY      3.3     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  VAL*     3.2    33.5    +      -       +      +
    107A  LYS*     3.7     5.2    -      -       -      +
    108A  ARG      3.1     1.4    -      -       -      -
    109A  ARG*     1.3    79.2    -      -       +      +
    111A  GLY*     1.3    61.5    +      -       -      +
    112A  ILE*     3.3    23.9    +      -       +      +
    121A  LEU*     5.9     1.8    -      -       +      -
----------------------------------------------------------
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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