Contacts of the helix formed by residues 127 - 156 (chain B) in PDB entry 2RS9


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 THR 127 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  ARG*     3.3    45.1    -      -       +      +
      4A  GLY*     4.3     1.8    -      -       -      +
    123B  ASN*     4.2     4.9    -      -       +      +
    124B  ALA*     3.5    18.6    +      -       +      +
    126B  ASP*     1.3    81.3    -      -       -      +
    128B  ILE*     1.3    63.9    +      -       -      +
    129B  PHE*     3.6    15.5    +      -       +      +
    130B  TYR*     3.2    27.6    +      -       -      +
    131B  ARG*     3.4    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  GLY*     6.4     1.6    -      -       -      -
     67B  ILE*     4.4    15.9    -      -       +      -
    127B  THR*     1.3    71.6    -      -       -      +
    129B  PHE*     1.3    89.8    +      -       +      +
    131B  ARG*     3.3     5.9    +      -       -      +
    132B  ALA*     2.9    28.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  ARG      5.8     2.0    -      -       -      -
      5A  ALY      3.5    60.6    -      -       +      +
     67B  ILE*     3.7    36.3    -      -       +      -
     68B  PHE*     4.0     1.0    -      -       -      -
    119B  CYS*     3.2    14.3    -      -       -      -
    123B  ASN*     5.3     1.8    -      -       +      -
    127B  THR*     3.3    14.1    -      -       +      +
    128B  ILE*     1.3    93.7    -      -       +      +
    130B  TYR*     1.3    65.0    +      -       -      +
    132B  ALA*     3.4     7.5    +      -       -      +
    133B  ALA      3.2    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  CYS*     4.4     0.4    -      -       -      -
    120B  LEU*     3.6    24.4    -      -       +      +
    123B  ASN*     3.3    35.7    +      -       -      +
    124B  ALA      3.5     8.7    -      -       -      +
    125B  LYS*     3.5    41.2    -      -       +      +
    126B  ASP*     4.0     2.0    -      -       -      -
    127B  THR*     3.2    23.1    +      -       -      +
    128B  ILE      3.4     0.2    -      -       -      -
    129B  PHE*     1.3    76.2    -      -       -      +
    131B  ARG*     1.3    73.3    +      -       +      +
    133B  ALA*     3.2     7.3    +      -       -      +
    134B  VAL*     3.2    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127B  THR      3.4    12.2    +      -       -      +
    128B  ILE*     3.3     6.9    +      -       -      +
    130B  TYR*     1.3    87.1    -      -       +      +
    132B  ALA*     1.3    58.8    +      -       -      +
    134B  VAL*     3.3    27.5    +      -       -      +
    135B  ARG*     2.9    27.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  LYS      5.6     0.2    -      -       -      +
     63B  ASP*     5.5     1.6    -      -       -      +
     67B  ILE*     3.5    27.8    -      -       +      -
     68B  PHE*     3.6    18.7    -      -       +      -
    128B  ILE*     2.9    18.8    +      -       +      +
    129B  PHE      3.6     5.2    -      -       -      +
    130B  TYR      3.3     0.2    -      -       -      -
    131B  ARG*     1.3    77.0    -      -       -      +
    133B  ALA*     1.3    55.8    +      -       -      +
    135B  ARG*     3.3     9.0    +      -       -      +
    136B  LEU*     3.2    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68B  PHE*     3.5     9.8    -      -       +      -
    116B  VAL*     3.6    21.8    -      -       +      +
    119B  CYS*     3.6    31.9    -      -       +      -
    120B  LEU*     4.0     8.5    -      -       +      -
    129B  PHE      3.2     8.2    +      -       -      +
    130B  TYR      3.2     9.1    +      -       -      +
    132B  ALA*     1.3    72.5    -      -       -      +
    134B  VAL*     1.3    63.2    +      -       -      +
    136B  LEU*     3.3     7.7    +      -       -      +
    137B  ARG*     3.0    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 134 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  LEU*     4.4    13.2    -      -       +      -
    130B  TYR*     3.2    28.6    +      -       +      +
    131B  ARG*     3.3    35.4    +      -       -      +
    133B  ALA*     1.3    74.0    -      -       -      +
    135B  ARG*     1.3    60.5    +      -       -      +
    137B  ARG*     3.3    31.0    +      -       -      +
    138B  GLU*     3.3    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  LYS      4.6     8.7    -      -       -      +
    131B  ARG*     2.9    13.8    +      -       +      +
    132B  ALA*     3.4    13.5    -      -       -      +
    133B  ALA      3.3     0.2    -      -       -      -
    134B  VAL*     1.3    75.0    -      -       -      +
    136B  LEU*     1.3    57.8    +      -       -      +
    138B  GLU*     3.3    23.1    +      -       -      +
    139B  GLN*     2.9    76.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  LEU      4.3     4.9    -      -       -      +
     62B  LYS*     3.6    41.3    -      -       +      +
     63B  ASP*     4.2     5.4    -      -       +      +
     68B  PHE*     3.3    42.4    -      -       +      -
     90B  PHE*     4.1    11.2    -      -       +      -
    112B  PHE*     3.5    30.4    -      -       +      -
    115B  ILE*     5.1     3.4    -      -       +      -
    116B  VAL*     4.0    11.4    -      -       +      -
    132B  ALA      3.2    13.1    +      -       -      +
    133B  ALA      3.3     8.5    +      -       -      +
    135B  ARG*     1.3    73.5    -      -       -      +
    137B  ARG*     1.3    62.3    +      -       -      +
    140B  GLY*     3.1    23.2    +      -       -      +
    141B  GLY      3.4     5.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 137 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  PHE*     4.8     3.4    -      -       -      -
    113B  ASN*     5.6     5.8    -      -       -      +
    116B  VAL*     4.0    25.1    -      -       +      +
    120B  LEU*     5.0     9.8    -      -       -      +
    133B  ALA      3.0    13.9    +      -       -      +
    134B  VAL*     3.3    32.5    +      -       -      +
    136B  LEU*     1.3    75.3    -      -       -      +
    138B  GLU*     1.3    80.0    +      -       -      +
    141B  GLY*     3.8    12.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 138 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134B  VAL*     3.3    23.4    +      -       +      +
    135B  ARG*     3.8    24.2    +      -       -      +
    136B  LEU      3.2     0.2    -      -       -      -
    137B  ARG*     1.3   100.9    +      -       +      +
    139B  GLN*     1.3    67.4    +      -       +      +
    140B  GLY      3.6     0.2    -      -       -      -
    141B  GLY*     3.3     9.2    +      -       -      -
    142B  ALA*     3.5    10.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 139 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  LYS*     3.8    33.3    +      -       +      +
    135B  ARG*     2.9    67.9    +      -       -      +
    138B  GLU*     1.3    74.6    -      -       +      +
    140B  GLY*     1.3    59.5    +      -       -      +
    142B  ALA*     3.5    20.4    +      -       -      +
    143B  VAL*     3.7     8.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 140 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  LEU*     3.5    28.3    -      -       -      +
     62B  LYS*     3.9     8.8    -      -       -      +
    112B  PHE*     4.3     5.4    -      -       -      -
    136B  LEU      3.1    14.3    +      -       -      -
    139B  GLN*     1.3    73.7    -      -       -      +
    141B  GLY*     1.3    62.6    +      -       -      +
    142B  ALA      3.3     0.9    -      -       -      -
    143B  VAL*     3.2    19.0    +      -       -      +
    144B  LEU*     3.2    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 141 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  PHE*     4.5     2.2    -      -       -      -
    136B  LEU      3.4     6.5    +      -       -      -
    137B  ARG      3.8    12.3    -      -       -      -
    138B  GLU      3.3     8.0    +      -       -      -
    139B  GLN      3.3     1.8    -      -       -      -
    140B  GLY*     1.3    76.7    -      -       -      +
    142B  ALA*     1.3    58.5    +      -       -      +
    144B  LEU*     3.7    10.1    +      -       -      +
    145B  ARG*     3.3    40.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 142 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138B  GLU      3.5     7.8    +      -       -      +
    139B  GLN*     3.5    13.1    +      -       -      +
    140B  GLY      3.3     0.2    -      -       -      -
    141B  GLY*     1.3    74.4    -      -       -      +
    143B  VAL*     1.3    64.2    +      -       +      +
    145B  ARG*     3.0    18.5    +      -       -      +
    146B  GLN*     3.0    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 143 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55B  THR*     4.1     6.1    -      -       +      -
     58B  GLN*     3.6    24.2    -      -       +      +
     59B  LEU*     3.7    23.1    -      -       +      -
     62B  LYS*     3.9    25.1    -      -       +      -
    139B  GLN      3.7     6.7    -      -       -      +
    140B  GLY*     3.2    24.8    +      -       -      +
    142B  ALA*     1.3    76.6    -      -       +      +
    144B  LEU*     1.3    57.4    +      -       -      +
    146B  GLN*     3.2    29.9    -      -       -      +
    147B  ALA*     3.1    25.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 144 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55B  THR*     4.6     0.7    -      -       +      -
     59B  LEU*     4.1    14.8    -      -       +      -
    105B  PHE*     3.3    15.5    -      -       +      -
    108B  PHE*     3.7    37.0    -      -       +      +
    109B  GLU*     4.1    35.9    -      -       +      +
    112B  PHE*     3.6    37.7    -      -       +      -
    113B  ASN*     5.0     1.8    -      -       -      +
    140B  GLY      3.2    13.3    +      -       -      +
    141B  GLY*     4.0     9.0    -      -       -      +
    142B  ALA      3.3     0.2    -      -       -      -
    143B  VAL*     1.3    77.4    -      -       -      +
    145B  ARG*     1.3    58.5    +      -       -      +
    148B  ARG*     3.0    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 145 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109B  GLU*     4.9    15.8    +      -       -      -
    141B  GLY*     3.3    30.3    +      -       -      +
    142B  ALA*     3.0    12.4    +      -       -      +
    144B  LEU*     1.3    74.5    -      -       -      +
    146B  GLN*     1.3    65.3    +      -       -      +
    147B  ALA      3.1     2.8    +      -       -      -
    148B  ARG*     3.4    27.7    +      -       -      +
    149B  ARG*     3.5    14.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 146 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  GLN*     4.7    15.2    -      -       -      +
    142B  ALA*     3.0    11.4    +      -       -      +
    143B  VAL*     3.2    47.0    +      -       -      +
    145B  ARG*     1.3    74.2    -      -       -      +
    147B  ALA*     1.3    59.8    +      -       +      +
    149B  ARG*     2.8    40.6    +      -       -      +
    150B  GLN*     3.9     2.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 147 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     4.6     5.5    -      -       -      +
     55B  THR*     3.4    34.1    -      -       +      +
    105B  PHE*     3.8    11.6    -      -       +      -
    143B  VAL      3.1    19.0    +      -       -      +
    145B  ARG      3.1     0.6    -      -       -      -
    146B  GLN*     1.3    82.0    -      -       +      +
    148B  ARG*     1.3    62.2    +      -       -      +
    149B  ARG      3.3     1.6    -      -       -      -
    150B  GLN*     3.3    29.5    +      -       -      +
    151B  ALA      4.0     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 148 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  PHE*     3.6    35.7    -      -       +      -
    109B  GLU*     5.2     7.2    -      -       -      -
    144B  LEU      3.0    19.7    +      -       -      +
    145B  ARG*     3.4    20.4    +      -       -      +
    147B  ALA*     1.3    75.1    -      -       -      +
    149B  ARG*     1.3    60.2    +      -       -      +
    151B  ALA*     3.0    21.9    +      -       +      +
    152B  GLU*     3.1    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 149 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145B  ARG      3.5     7.2    +      -       -      +
    146B  GLN*     2.8    34.1    +      -       -      +
    148B  ARG*     1.3    83.2    -      -       -      +
    150B  GLN*     1.3    81.8    +      -       -      +
    151B  ALA      3.3     0.2    -      -       -      -
    152B  GLU*     3.9    11.6    -      -       +      +
    153B  LYS*     3.2    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 150 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     3.8    34.2    +      -       +      +
     55B  THR*     5.1     2.4    +      -       -      -
    146B  GLN      3.9     2.7    +      -       -      +
    147B  ALA*     3.5    25.0    +      -       -      +
    148B  ARG      3.1     1.0    +      -       -      -
    149B  ARG*     1.3   111.6    +      -       -      +
    151B  ALA*     1.3    57.6    +      -       -      +
    153B  LYS*     3.4    21.6    -      -       -      +
    154B  MET*     3.7    15.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 151 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  PHE*     3.7    35.0    -      -       +      -
     51B  LEU*     3.7     9.0    -      -       +      +
    105B  PHE*     5.0     6.1    -      -       +      -
    147B  ALA      4.9     0.2    -      -       -      +
    148B  ARG*     3.0    13.6    +      -       +      +
    150B  GLN*     1.3    76.1    -      -       -      +
    152B  GLU*     1.3    63.2    +      -       +      +
    153B  LYS      3.3     1.6    -      -       -      -
    154B  MET*     3.2    13.1    +      -       -      +
    155B  GLY*     2.9    25.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 152 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148B  ARG*     3.1    50.0    +      -       +      +
    149B  ARG*     3.7     7.6    +      -       -      +
    151B  ALA*     1.3    77.2    -      -       +      +
    153B  LYS*     1.3    60.2    +      -       -      +
    154B  MET      3.3     1.0    +      -       -      -
    155B  GLY*     4.0     4.1    -      -       -      +
    156B  SER*     3.4    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 153 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    149B  ARG      3.2    16.4    +      -       -      +
    150B  GLN*     3.4    26.2    -      -       -      +
    152B  GLU*     1.3    75.3    -      -       -      +
    154B  MET*     1.3    66.6    +      -       +      +
    156B  SER*     4.6     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 154 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47B  GLY*     4.2     5.2    -      -       -      -
     48B  PHE*     3.7    40.8    -      -       +      +
     51B  LEU*     4.0     5.6    -      -       +      -
    150B  GLN      3.7    20.2    -      -       -      +
    151B  ALA*     3.3    17.9    -      -       -      +
    153B  LYS*     1.3    84.5    -      -       +      +
    155B  GLY*     1.3    61.5    +      -       -      +
    156B  SER*     3.3     4.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 155 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151B  ALA      2.9    15.1    +      -       -      -
    152B  GLU*     3.4     6.4    +      -       -      -
    154B  MET*     1.3    75.1    -      -       -      +
    156B  SER*     1.3    71.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 156 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152B  GLU*     3.4    18.1    +      -       -      +
    153B  LYS      5.2     3.6    -      -       -      -
    154B  MET*     3.3     7.0    -      -       -      +
    155B  GLY*     1.3    83.3    -      -       -      +
    157B  GLY*     1.3    66.7    +      -       -      +
    158B  PRO      4.9     1.7    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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