Contacts of the helix formed by residues 174 - 200 (chain A) in PDB entry 6KJV


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 174 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  HIS      5.5     2.0    -      -       -      +
    172A  LEU*     3.1    10.2    +      -       -      -
    173A  HIS*     1.3    75.0    -      -       -      +
    175A  THR*     1.3    66.4    +      -       -      +
    176A  ARG*     3.2    27.1    -      -       +      +
    177A  ASN*     3.0    33.2    +      -       -      +
    178A  TYR*     3.0    28.1    +      -       -      -
   1154A  THR*     5.9     3.8    -      -       +      -
   1156A  THR*     4.3    18.4    -      -       +      +
   1158A  ASP*     3.5    14.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  CYS*     1.3    71.8    -      -       -      +
    176A  ARG*     1.3    64.3    +      -       -      +
    178A  TYR*     3.2    15.3    +      -       +      +
    179A  ILE*     3.0    31.6    +      -       -      +
    250A  TYR*     3.3    21.8    +      -       -      -
    261A  SER*     5.5     8.7    -      -       -      +
    266A  PHE*     4.2    16.1    -      -       +      -
   1158A  ASP*     3.1    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174A  CYS*     3.2    21.6    -      -       -      -
    175A  THR*     1.3    83.2    +      -       -      +
    177A  ASN*     1.3    80.7    +      -       -      +
    179A  ILE*     3.3     6.0    +      -       -      +
    180A  HIS*     2.9    49.3    +      -       +      +
    250A  TYR*     3.6    30.2    +      -       +      +
    254A  LEU*     5.3     2.7    -      -       -      +
    345A  ILE*     4.2    30.8    -      -       -      +
    349A  LEU*     3.6    32.0    -      -       +      +
    406A  ASN*     4.7    18.4    +      -       -      +
    408A  GLU*     4.8    12.9    -      -       -      +
   1156A  THR*     5.1     9.3    -      -       -      +
   2001A  97Y      5.2     2.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  LEU*     3.9    25.5    -      -       +      +
    172A  LEU*     2.8    49.5    +      -       -      +
    174A  CYS*     3.0    16.7    +      -       -      +
    176A  ARG*     1.3    96.7    +      -       -      +
    178A  TYR*     1.3    62.5    +      -       +      +
    180A  HIS*     3.2    19.1    +      -       -      +
    181A  LEU*     2.9    34.4    +      -       +      +
    402A  TYR      5.1     1.0    -      -       -      +
    406A  ASN*     5.6     2.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167A  LEU*     5.4     4.7    -      -       +      -
    173A  HIS*     3.4    44.8    +      +       +      +
    174A  CYS*     3.0    33.6    +      -       -      -
    175A  THR*     3.2    14.6    +      -       +      +
    177A  ASN*     1.3    75.4    -      -       +      +
    179A  ILE*     1.3    60.7    +      -       -      +
    181A  LEU*     3.0    29.8    +      -       +      +
    182A  ASN*     2.7    28.1    +      -       -      +
    266A  PHE*     3.8    20.4    -      +       +      -
----------------------------------------------------------
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Residues in contact with ILE 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  THR*     3.0    16.6    +      -       -      +
    176A  ARG      3.5     7.2    -      -       -      +
    178A  TYR*     1.3    74.1    -      -       -      +
    180A  HIS*     1.3    62.6    +      -       -      +
    182A  ASN*     3.3     8.7    +      -       -      +
    183A  LEU*     3.1    20.8    +      -       +      +
    243A  TRP*     4.2    10.7    -      -       +      +
    246A  VAL*     4.1    22.7    -      -       +      +
    247A  GLU*     3.3    26.7    -      -       +      +
    250A  TYR*     3.7    43.5    -      -       +      -
    266A  PHE*     3.8    16.8    -      -       +      -
    269A  TYR*     4.2    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166A  LEU*     4.1     2.7    -      -       +      -
    176A  ARG*     2.9    39.3    +      -       +      +
    177A  ASN*     3.3    25.5    +      -       -      +
    178A  TYR      3.2     0.2    -      -       -      -
    179A  ILE*     1.3    76.0    -      -       -      +
    181A  LEU*     1.3    57.1    +      -       -      +
    183A  LEU*     3.2     5.5    +      -       -      +
    184A  PHE*     2.8    50.6    +      -       +      -
    247A  GLU*     3.1    35.6    +      -       -      -
    349A  LEU*     4.0    10.3    -      -       +      +
    402A  TYR*     3.5    48.1    +      +       +      -
   2001A  97Y      5.8     0.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163A  SER*     3.7    42.6    -      -       -      +
    166A  LEU*     4.1    15.7    -      -       +      +
    167A  LEU*     3.6    30.5    -      -       +      -
    177A  ASN*     2.9    20.3    +      -       +      +
    178A  TYR*     3.0    27.1    +      -       +      +
    180A  HIS*     1.3    76.3    -      -       -      +
    182A  ASN*     1.3    60.7    +      -       -      +
    184A  PHE*     3.3     8.1    +      -       +      +
    185A  ALA*     2.9    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  TYR*     2.7    28.1    +      -       -      +
    179A  ILE*     3.3     4.2    +      -       -      +
    181A  LEU*     1.3    78.8    -      -       -      +
    183A  LEU*     1.3    63.1    +      -       -      +
    185A  ALA*     3.2     7.6    +      -       -      +
    186A  SER*     3.0    19.9    +      -       -      -
    243A  TRP*     3.3    41.0    -      -       +      -
    266A  PHE*     4.5    10.9    -      -       -      -
    270A  VAL*     4.6     4.6    -      -       -      +
    274A  TRP*     3.1    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  ILE*     3.1    13.4    +      -       +      +
    180A  HIS*     3.2     8.7    +      -       -      +
    182A  ASN*     1.3    76.3    -      -       -      +
    184A  PHE*     1.3    62.2    +      -       -      +
    186A  SER*     2.6    24.9    +      -       -      +
    187A  PHE*     3.1    31.9    +      -       +      -
    240A  ASN      3.9     8.5    -      -       -      +
    243A  TRP*     3.8    27.7    -      -       +      +
    244A  LEU*     3.9    22.0    -      -       +      +
    247A  GLU*     4.3     9.6    -      -       +      +
    356A  LEU*     5.2     2.2    -      -       +      -
    360A  LEU*     6.2     0.7    -      -       +      -
    398A  VAL*     3.7    19.1    -      -       +      -
    402A  TYR*     3.7    32.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  LEU*     3.6    28.4    -      -       +      +
    162A  ALA*     4.5    11.0    -      -       +      -
    163A  SER*     4.3    14.6    -      -       -      -
    166A  LEU*     3.5    29.4    -      -       +      -
    180A  HIS*     2.8    29.5    +      -       +      +
    181A  LEU*     3.6    18.2    -      -       +      +
    183A  LEU*     1.3    76.0    -      -       +      +
    185A  ALA*     1.3    57.6    -      -       -      +
    187A  PHE*     3.1     4.1    +      -       -      +
    188A  ILE*     2.8    41.5    +      -       +      +
    398A  VAL*     3.5    34.1    -      -       +      -
    399A  ALA*     4.4     5.4    -      -       -      -
    402A  TYR*     3.9    26.9    -      +       +      -
    403A  CYS*     4.9     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  LEU      2.9    17.4    +      -       -      +
    182A  ASN*     3.2     7.2    +      -       -      +
    184A  PHE*     1.3    72.9    -      -       -      +
    186A  SER*     1.3    67.3    +      -       -      +
    188A  ILE*     3.7    10.3    -      -       -      +
    189A  LEU*     2.9    36.1    +      -       +      +
    274A  TRP*     4.3    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  ASN      3.0    10.0    +      -       -      -
    183A  LEU*     2.6    26.0    +      -       -      +
    185A  ALA*     1.3    77.7    -      -       -      +
    187A  PHE*     1.3    60.6    +      -       -      +
    189A  LEU*     3.4     4.8    +      -       -      +
    190A  ARG*     3.0    22.5    +      -       -      +
    236A  CYS*     4.1     6.5    -      -       -      +
    239A  ALA*     3.9    26.4    +      -       -      -
    240A  ASN*     2.7    31.8    +      -       -      +
    243A  TRP*     4.9     1.3    -      -       -      -
    274A  TRP*     3.9    12.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  TYR*     5.5     1.5    -      +       -      -
    159A  LEU*     3.6    23.2    -      -       +      +
    183A  LEU*     3.1    43.2    +      -       +      -
    184A  PHE*     3.1     3.6    +      -       -      +
    186A  SER*     1.3    81.3    +      -       -      +
    188A  ILE*     1.3    62.6    +      -       -      +
    190A  ARG*     3.3    12.5    +      -       -      +
    191A  ALA*     3.0    22.5    +      -       -      +
    240A  ASN*     3.9    29.2    -      -       +      -
    360A  LEU*     3.9    26.0    -      -       +      -
    394A  GLN*     3.9    30.1    -      -       +      -
    395A  GLY*     3.9    16.4    -      -       -      -
    398A  VAL*     3.9    24.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  PHE*     3.7    26.0    -      -       +      +
    159A  LEU*     3.7    30.5    -      -       +      +
    160A  VAL*     3.9    24.0    -      -       +      -
    163A  SER*     4.4     7.0    -      -       -      +
    184A  PHE*     2.8    26.8    +      -       +      +
    185A  ALA*     3.7     8.7    -      -       -      +
    187A  PHE*     1.3    76.9    -      -       -      +
    189A  LEU*     1.3    61.4    +      -       +      +
    191A  ALA*     3.2     8.1    +      -       -      +
    192A  LEU*     2.9    36.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185A  ALA*     2.9    26.7    +      -       +      +
    186A  SER      3.8     1.6    -      -       -      +
    188A  ILE*     1.3    77.8    -      -       +      +
    190A  ARG*     1.3    68.0    +      -       -      +
    192A  LEU*     3.2    22.4    +      -       +      +
    193A  CYS*     2.9    27.8    +      -       -      -
    232A  LEU*     5.3    13.7    -      -       +      -
    235A  TYR*     5.8     3.6    -      -       +      -
    236A  CYS*     3.4    22.9    -      -       -      -
    274A  TRP*     4.8    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  TYR*     3.4    29.4    +      -       +      -
    186A  SER      3.0    15.5    +      -       -      +
    187A  PHE*     3.3    17.3    +      -       -      +
    189A  LEU*     1.3    75.7    -      -       -      +
    191A  ALA*     1.3    62.9    +      -       -      +
    193A  CYS*     3.2     8.9    +      -       -      +
    194A  VAL*     3.0    24.4    +      -       -      +
    233A  MET*     3.6    25.4    -      -       +      +
    236A  CYS*     3.7    16.0    -      -       +      -
    237A  VAL*     4.1    22.6    -      -       +      +
    240A  ASN*     3.2    29.6    -      -       -      +
    241A  TYR*     5.5     4.9    +      -       -      -
    391A  THR*     4.0    18.7    -      -       -      +
    394A  GLN*     3.1    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152A  TYR*     3.8    28.4    -      -       +      +
    155A  SER*     5.8     1.3    -      -       -      -
    156A  PHE*     4.0    18.8    -      -       +      +
    159A  LEU*     6.2     0.7    -      -       +      -
    187A  PHE      3.0    13.7    +      -       -      +
    188A  ILE*     3.2     9.2    +      -       -      +
    190A  ARG*     1.3    75.8    -      -       -      +
    192A  LEU*     1.3    62.3    +      -       -      +
    194A  VAL*     3.1     2.5    +      -       -      +
    195A  PHE*     2.9    45.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  PHE*     3.5    27.6    -      -       +      -
    188A  ILE*     2.9    28.8    +      -       +      +
    189A  LEU*     3.2    28.0    +      -       +      +
    191A  ALA*     1.3    75.4    -      -       -      +
    193A  CYS*     1.3    59.0    +      -       -      +
    195A  PHE*     3.4     9.1    +      -       +      +
    196A  PHE*     2.9    31.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  LEU      2.9    18.5    +      -       -      -
    190A  ARG      3.4     8.3    -      -       -      +
    192A  LEU*     1.3    76.7    -      -       -      +
    194A  VAL*     1.3    64.9    +      -       -      +
    196A  PHE*     3.3     3.6    +      -       -      +
    197A  LYS*     2.9    25.8    +      -       -      +
    229A  VAL*     4.0    18.0    -      -       +      +
    232A  LEU*     3.8    29.2    -      -       -      -
    233A  MET*     3.8    45.1    -      -       +      -
    236A  CYS*     4.5     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  TYR*     3.7    33.9    -      -       +      +
    149A  THR*     5.8     5.2    -      -       +      -
    152A  TYR*     3.8    37.2    -      -       +      -
    190A  ARG      3.0    14.8    +      -       -      +
    191A  ALA*     3.1     8.9    +      -       -      +
    193A  CYS*     1.3    77.4    -      -       -      +
    195A  PHE*     1.3    67.6    +      -       +      +
    197A  LYS*     3.4     6.8    +      -       -      +
    198A  ASP*     3.0    24.6    +      -       +      +
    233A  MET*     4.1    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149A  THR*     4.3    13.7    -      -       +      -
    152A  TYR*     3.5    39.3    -      -       +      -
    153A  ALA*     3.8    13.7    -      -       +      -
    156A  PHE*     3.9    20.2    -      +       +      -
    191A  ALA*     2.9    39.4    +      -       +      +
    192A  LEU*     3.9    11.0    -      -       +      +
    194A  VAL*     1.3    78.9    -      -       +      +
    196A  PHE*     1.3    56.7    +      -       -      +
    198A  ASP*     3.4     9.0    +      -       +      +
    199A  ALA*     2.8    31.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  LEU      2.9    18.0    +      -       -      +
    193A  CYS*     3.7     7.0    -      -       -      +
    195A  PHE*     1.3    75.6    -      -       -      +
    197A  LYS*     1.3    65.8    +      -       -      +
    199A  ALA*     3.3     6.1    +      -       +      +
    200A  ALA*     2.9    29.6    +      -       +      +
    220A  TYR*     4.9     3.6    -      +       -      -
    225A  ALA*     5.7     6.7    -      -       +      -
    229A  VAL*     3.6    32.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  CYS      2.9    17.6    +      -       -      +
    194A  VAL*     3.8     5.6    -      -       -      +
    196A  PHE*     1.3    77.5    -      -       -      +
    198A  ASP*     1.3    62.4    +      -       -      +
    200A  ALA*     3.5     8.7    +      -       -      +
    201A  LEU*     3.6    25.1    +      -       +      +
    220A  TYR*     3.9    32.3    -      -       +      +
    226A  CYS*     5.8     4.9    -      -       -      -
    229A  VAL*     4.6     7.8    -      -       +      +
    233A  MET*     6.5     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145A  TYR*     2.8    34.4    +      -       +      -
    149A  THR*     4.3    11.2    -      -       +      +
    194A  VAL*     3.0    19.2    +      -       +      +
    195A  PHE*     3.8    10.1    -      -       +      +
    197A  LYS*     1.3    78.9    -      -       -      +
    199A  ALA*     1.3    60.9    +      -       -      +
    201A  LEU*     3.2    36.0    +      -       +      +
    202A  LYS*     4.3     1.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  PHE      2.8    19.0    +      -       -      +
    196A  PHE*     3.3     6.3    +      -       +      +
    198A  ASP*     1.3    76.6    -      -       -      +
    200A  ALA*     1.3    60.6    +      -       -      +
    201A  LEU      3.4     0.7    +      -       -      -
    202A  LYS*     3.5    21.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  PHE*     2.9    25.9    +      -       +      +
    197A  LYS      3.9     4.3    -      -       -      +
    198A  ASP      3.3     0.4    -      -       -      -
    199A  ALA*     1.3    74.0    -      -       -      +
    201A  LEU*     1.3    65.2    +      -       -      +
    202A  LYS      3.2     5.2    +      -       -      +
    203A  TRP      3.6    15.4    -      -       -      +
    220A  TYR*     3.6    41.2    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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