Contacts of the helix formed by residues 154 - 176 (chain B) in PDB entry 2I10


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 ASP 154 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184A  ALA*     4.8     4.5    -      -       -      +
    188A  LEU*     5.1     2.2    -      -       +      +
    152B  GLY      3.2     5.1    +      -       -      +
    153B  THR*     1.3    71.9    -      -       -      +
    155B  CYS*     1.3    58.2    +      -       -      +
    156B  THR*     3.2     9.5    +      -       -      -
    157B  ALA*     3.1    34.1    +      -       +      +
    158B  LEU*     3.0    28.1    +      -       -      +
    202B  PGE      5.1     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 155 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137B  LEU*     3.4    16.3    -      -       +      +
    140B  PHE*     3.7    31.7    -      -       +      -
    141B  GLU*     5.1     0.7    -      -       -      -
    144B  LEU*     3.6    31.4    -      -       -      -
    149B  LEU*     4.3     9.6    -      -       -      -
    153B  THR*     3.0    16.5    +      -       -      -
    154B  ASP*     1.3    72.5    +      -       -      +
    156B  THR*     1.3    60.7    +      -       -      +
    158B  LEU*     4.3     1.3    -      -       -      -
    159B  ALA*     2.9    31.0    +      -       -      +
    202B  PGE      4.7     3.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 156 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  GLU*     3.4    36.2    -      -       +      +
    133B  ARG*     4.7    13.2    +      -       -      +
    137B  LEU*     4.0    14.6    -      -       -      +
    154B  ASP*     3.6     8.1    -      -       -      +
    155B  CYS*     1.3    77.0    -      -       -      +
    157B  ALA*     1.3    65.1    +      -       -      +
    159B  ALA*     3.6     3.2    +      -       -      +
    160B  ARG*     3.2    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 157 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    181A  GLU*     4.7     6.3    -      -       -      -
    184A  ALA*     3.6    28.0    -      -       +      -
    185A  ALA*     4.1     3.6    -      -       -      +
    188A  LEU*     3.8    12.6    -      -       +      +
    154B  ASP*     3.1    33.6    +      -       +      +
    156B  THR*     1.3    78.6    -      -       -      +
    158B  LEU*     1.3    59.1    +      -       -      +
    160B  ARG*     3.4     7.7    +      -       -      +
    161B  TYR*     2.9    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 158 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  LEU*     3.8    14.3    -      -       +      +
    140B  PHE*     3.5    29.4    -      -       +      -
    149B  LEU*     4.3     6.1    -      -       +      -
    153B  THR*     3.8    23.8    -      -       +      -
    154B  ASP      3.0    18.3    +      -       -      +
    155B  CYS      3.9     2.0    -      -       -      +
    156B  THR      3.3     0.2    -      -       -      -
    157B  ALA*     1.3    74.3    -      -       -      +
    159B  ALA*     1.3    59.4    +      -       -      +
    161B  TYR*     3.3     5.3    +      -       +      +
    162B  VAL*     3.0    31.7    +      -       -      +
    192B  VAL*     3.7    37.7    -      -       +      +
    193B  VAL*     4.0    14.8    -      -       +      -
    194B  PRO*     4.3    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 159 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  ARG*     4.3    15.0    -      -       +      +
    136B  VAL*     4.1    18.6    -      -       +      +
    137B  LEU*     3.9    22.2    -      -       +      -
    140B  PHE*     3.6     8.4    -      -       +      -
    155B  CYS      2.9    18.0    +      -       -      +
    156B  THR      3.7     5.2    -      -       -      +
    158B  LEU*     1.3    72.5    -      -       -      +
    160B  ARG*     1.3    64.7    +      -       -      +
    162B  VAL*     3.2     4.6    +      -       -      +
    163B  MSE      3.1    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 160 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  GLU*     2.6    44.9    +      -       +      -
    177A  ALA*     3.6    18.5    -      -       -      +
    178A  PRO*     3.5     1.8    -      -       -      +
    181A  GLU*     2.8    48.9    +      -       +      +
    182A  LEU*     4.6     6.1    -      -       +      +
    185A  ALA*     4.4     7.6    -      -       +      -
    129B  ARG*     3.3     2.8    -      -       -      +
    133B  ARG*     3.5    15.4    -      -       -      +
    156B  THR      3.2    11.3    +      -       -      +
    157B  ALA      3.6     9.4    -      -       -      +
    159B  ALA*     1.3    74.9    -      -       -      +
    161B  TYR*     1.3    67.0    +      -       -      +
    163B  MSE      3.3    14.0    +      -       -      +
    164B  ALA*     3.0    23.8    +      -       +      +
    201B  NPO      2.8    57.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 161 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  TYR*     3.4    22.6    +      +       -      -
    165A  ALA*     5.6     2.2    -      -       +      -
    169A  LEU*     6.0     0.7    -      -       +      -
    185A  ALA*     3.9    21.7    -      -       +      +
    188A  LEU*     4.3     4.7    -      -       +      -
    189A  ALA*     3.8    26.2    -      -       +      -
     85B  VAL*     6.0     0.2    -      -       +      -
     89B  LEU*     5.7     2.0    -      -       +      -
    157B  ALA      2.9    14.4    +      -       -      +
    158B  LEU*     3.6    15.5    -      -       +      +
    159B  ALA      3.2     0.2    -      -       -      -
    160B  ARG*     1.3    77.4    -      -       -      +
    162B  VAL*     1.3    68.6    +      -       +      +
    164B  ALA*     3.3     7.1    +      -       +      +
    165B  ALA*     2.8    40.6    +      -       +      +
    189B  ALA*     2.6    46.6    +      -       -      +
    192B  VAL*     3.4    29.8    -      -       +      +
    193B  VAL*     5.2     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 162 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  VAL*     4.1    34.1    -      -       +      -
     88B  PHE*     4.9     7.6    -      -       +      -
     89B  LEU*     4.6     5.4    -      -       +      -
    132B  MSE      6.2     1.8    -      -       +      -
    136B  VAL*     4.5    17.9    -      -       +      -
    140B  PHE*     4.1    20.6    -      -       +      -
    158B  LEU      3.0    20.8    +      -       -      +
    159B  ALA      3.2     7.6    +      -       -      +
    161B  TYR*     1.3    82.0    -      -       +      +
    163B  MSE      1.3    58.3    +      -       +      +
    165B  ALA*     3.3     7.0    +      -       -      +
    166B  VAL*     3.1    36.6    +      -       +      +
    193B  VAL*     4.2     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MSE 163 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  GLU*     3.5    12.3    -      -       -      +
    129B  ARG*     3.2    59.2    -      -       -      +
    130B  GLU*     4.4     2.5    -      -       -      +
    132B  MSE      3.7    30.1    -      -       +      -
    133B  ARG*     3.5    39.5    -      -       +      -
    136B  VAL*     6.0     2.0    -      -       +      -
    159B  ALA      3.1    18.6    +      -       -      +
    160B  ARG*     3.6    22.7    -      -       -      +
    162B  VAL*     1.3    75.3    -      -       +      +
    164B  ALA*     1.3    61.7    +      -       -      +
    166B  VAL*     3.3     2.5    +      -       -      +
    167B  TYR*     2.8    34.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 164 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164A  ALA      4.2     1.2    -      -       -      +
    165A  ALA*     5.1     2.9    -      -       -      +
    168A  GLY*     3.1    34.4    -      -       -      +
    169A  LEU*     3.9    24.5    -      -       +      +
    172A  GLU*     4.0     8.1    -      -       +      +
    160B  ARG*     3.0    13.9    +      -       +      +
    161B  TYR*     3.5    11.9    -      -       +      +
    163B  MSE      1.3    76.0    -      -       -      +
    165B  ALA*     1.3    56.6    +      -       -      +
    167B  TYR*     4.6     0.7    -      -       -      -
    168B  GLY*     2.9    27.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 165 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  TYR*     5.8     1.1    -      -       +      -
    164A  ALA*     5.0     6.3    -      -       -      +
    165A  ALA*     5.8     2.5    -      -       -      +
     89B  LEU*     4.3    12.3    -      -       +      -
    161B  TYR*     2.8    33.9    +      -       +      +
    162B  VAL*     3.6     6.7    -      -       -      +
    163B  MSE      3.2     0.2    -      -       -      -
    164B  ALA*     1.3    74.9    -      -       -      +
    166B  VAL*     1.3    57.0    +      -       -      +
    168B  GLY*     3.8     0.6    -      -       -      -
    169B  LEU*     2.9    37.3    +      -       +      +
    189B  ALA*     4.2    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 166 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  CYS*     3.7    31.2    -      -       +      +
     88B  PHE*     3.5    24.0    -      -       +      -
     89B  LEU*     3.5    23.3    -      -       +      -
     92B  ARG*     4.2    10.5    -      -       +      -
     96B  PHE*     3.6    13.1    -      -       +      -
    132B  MSE      4.7     7.9    -      -       +      -
    162B  VAL*     3.1    19.0    +      -       +      +
    163B  MSE      3.3     8.0    +      -       -      +
    165B  ALA*     1.3    75.9    -      -       -      +
    167B  TYR*     1.3    63.0    +      -       +      +
    169B  LEU*     3.5     3.2    +      -       -      +
    170B  SER*     3.0    24.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 167 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168A  GLY*     4.3     2.7    -      -       -      -
    171A  VAL*     3.9    30.7    -      -       +      -
    172A  GLU*     3.2    27.6    -      -       +      -
     66B  CYS*     3.8    25.6    -      -       +      -
     67B  GLU*     2.5    29.4    +      -       -      -
    105B  CYS*     4.0     5.6    -      -       -      -
    107B  THR*     3.5    21.8    -      -       +      -
    108B  VAL*     3.8     3.6    -      -       +      +
    129B  ARG*     3.1    20.2    +      -       -      +
    132B  MSE      3.2    23.4    -      -       +      +
    163B  MSE      2.8    25.4    +      -       +      +
    164B  ALA*     4.1     3.8    -      -       -      +
    166B  VAL*     1.3    76.1    -      -       +      +
    168B  GLY*     1.3    57.6    +      -       -      +
    170B  SER*     3.2     6.8    +      -       -      -
    171B  VAL*     3.0    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 168 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    164A  ALA*     3.0    33.5    -      -       -      -
    167A  TYR*     4.4     2.9    -      -       -      +
    168A  GLY*     3.5     9.3    -      -       -      -
    164B  ALA      2.9    12.9    +      -       -      -
    167B  TYR*     1.3    74.5    -      -       -      +
    169B  LEU*     1.3    62.5    +      -       -      +
    171B  VAL*     3.3     5.7    +      -       -      +
    172B  GLU*     3.0    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 169 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    161A  TYR*     6.5     0.4    -      -       +      -
    164A  ALA*     3.8    11.8    -      -       +      +
     89B  LEU*     4.3    21.3    -      -       +      +
     92B  ARG*     6.0     0.2    -      -       +      -
     93B  VAL*     4.0    15.0    -      -       +      -
     96B  PHE*     4.0     7.0    -      -       +      -
    165B  ALA*     2.9    28.1    +      -       +      +
    166B  VAL*     3.9     5.2    -      -       -      +
    168B  GLY*     1.3    76.1    -      -       -      +
    170B  SER*     1.3    55.9    +      -       -      +
    172B  GLU*     3.4     1.9    +      -       -      +
    173B  ALA*     3.0    25.6    +      -       -      +
    182B  LEU*     3.4    50.0    -      -       +      +
    185B  ALA*     4.2     7.6    -      -       +      +
    186B  ALA*     3.8    29.8    -      -       +      +
    189B  ALA*     5.1     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 170 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66B  CYS*     3.8     8.7    -      -       -      -
     96B  PHE*     3.5    29.1    -      -       -      -
    104B  GLY*     3.5     3.1    -      -       -      -
    105B  CYS*     3.0    31.6    +      -       -      +
    108B  VAL*     3.9     2.9    -      -       -      +
    166B  VAL      3.0    14.4    +      -       -      -
    167B  TYR      3.2    10.7    +      -       -      -
    169B  LEU*     1.3    77.3    -      -       -      +
    171B  VAL*     1.3    56.7    +      -       -      +
    173B  ALA*     3.3     2.3    +      -       -      +
    174B  ALA*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 171 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  THR*     3.1    43.5    -      -       -      +
    108A  VAL*     4.4     2.5    -      -       +      -
    129A  ARG*     4.3     5.6    -      -       -      +
    167A  TYR*     3.7    34.1    -      -       +      -
    171A  VAL*     4.2     7.9    -      -       +      -
    108B  VAL*     3.7    22.9    -      -       +      -
    167B  TYR      3.0    17.6    +      -       -      +
    168B  GLY      3.3     7.8    +      -       -      +
    170B  SER*     1.3    76.9    -      -       -      +
    172B  GLU*     1.3    61.3    +      -       -      +
    174B  ALA*     3.3     7.6    +      -       -      +
    175B  SER*     2.9    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 172 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  ARG*     2.0    37.1    +      -       -      +
    160A  ARG*     2.8    37.6    +      -       -      -
    163A  MSE      3.5    13.4    -      -       -      +
    164A  ALA*     3.9    18.6    -      -       +      +
    167A  TYR*     3.1    21.5    -      -       +      -
    168B  GLY      3.0    20.1    +      -       -      +
    169B  LEU      3.8     0.4    -      -       -      +
    170B  SER      3.3     0.2    -      -       -      -
    171B  VAL*     1.3    74.4    -      -       -      +
    173B  ALA*     1.3    62.6    +      -       -      +
    175B  SER*     3.2     9.5    +      -       -      -
    176B  GLY      3.2     0.5    +      -       -      -
    177B  ALA*     3.1    23.8    +      -       +      +
    182B  LEU*     3.6    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 173 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  PHE*     3.5    39.3    -      -       +      +
     97B  THR*     4.2     7.2    -      -       +      +
    100B  GLY*     4.0    14.0    +      -       -      -
    101B  GLN      4.6     1.1    -      -       -      -
    169B  LEU      3.0    17.9    +      -       -      +
    170B  SER      3.6     3.6    -      -       -      +
    171B  VAL      3.3     0.2    -      -       -      -
    172B  GLU*     1.3    76.4    -      -       -      +
    174B  ALA*     1.3    56.4    +      -       -      +
    176B  GLY*     3.0    20.3    +      -       -      -
    177B  ALA*     4.1     4.6    +      -       -      +
    182B  LEU*     3.5    16.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 174 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  VAL*     3.8    10.3    -      -       +      -
    109A  GLN*     4.5     3.9    +      -       -      -
    100B  GLY      3.9     4.2    -      -       -      +
    101B  GLN      3.1    23.3    +      -       -      +
    102B  PRO*     3.3    28.5    -      -       -      +
    104B  GLY*     3.4    22.4    -      -       -      +
    170B  SER      2.9    16.5    +      -       -      +
    171B  VAL      3.3     6.5    +      -       -      +
    173B  ALA*     1.3    75.0    -      -       -      +
    175B  SER*     1.3    60.1    +      -       -      +
    176B  GLY      3.6     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 175 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  THR      4.0     5.5    +      -       -      -
    108A  VAL*     4.7     0.9    -      -       -      -
    109A  GLN*     2.9    35.2    +      -       -      +
    129A  ARG*     3.4    39.6    +      -       -      -
    171B  VAL      2.9    16.3    +      -       -      -
    172B  GLU      3.2     2.9    +      -       -      -
    173B  ALA      3.1     0.8    -      -       -      -
    174B  ALA*     1.3    78.1    -      -       -      +
    176B  GLY*     1.3    59.9    +      -       -      +
    177B  ALA      3.6     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 176 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100B  GLY*     5.3     6.7    -      -       -      -
    173B  ALA      3.0    11.9    +      -       -      -
    174B  ALA      3.2     1.4    -      -       -      -
    175B  SER*     1.3    81.5    -      -       -      +
    177B  ALA*     1.3    68.5    +      -       -      +
    178B  PRO*     3.4     5.0    -      -       -      +
----------------------------------------------------------
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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