Contacts of the helix formed by residues 95 - 124 (chain B) in PDB entry 1F45


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 SER 95 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  PHE*     1.3    68.3    +      -       -      +
     97B  MET*     3.1    12.1    -      -       -      +
     98B  MET*     3.3    21.6    -      -       -      +
     99B  ALA*     3.2    18.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 96 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  SER*     1.3    78.1    -      -       -      +
     97B  MET*     1.3    63.0    +      -       +      +
     99B  ALA*     3.0    11.4    +      -       +      -
    100B  LEU*     2.9    60.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 97 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  ALA      4.1     4.1    -      -       -      +
     79B  THR      3.8     9.0    -      -       -      +
     80B  SER*     3.0    45.8    -      -       -      +
     81B  PHE*     3.2    51.6    -      -       +      +
     82B  ILE*     4.8     0.7    -      -       -      -
     95B  SER      3.9     8.5    -      -       -      +
     96B  PHE*     1.3    82.4    -      -       +      +
     98B  MET*     1.3    61.8    +      -       -      +
    100B  LEU*     3.1    13.8    +      -       +      +
    101B  CYS*     2.9    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 98 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  ILE*     4.3    20.8    -      -       +      +
     83B  THR      4.6     3.8    -      -       -      +
     85B  GLY      3.7    22.7    -      -       -      +
     86B  SER*     4.9     3.1    -      -       -      -
     95B  SER*     3.3    24.6    +      -       -      +
     97B  MET*     1.3    78.1    -      -       -      +
     99B  ALA*     1.3    65.6    +      -       -      +
    101B  CYS*     3.1     8.6    +      -       -      +
    102B  LEU*     3.0    41.0    +      -       +      +
    194B  LEU*     3.9    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 99 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  SER      3.2     7.5    +      -       -      +
     96B  PHE*     3.0    15.8    +      -       +      +
     98B  MET*     1.3    79.7    -      -       -      +
    100B  LEU*     1.3    57.0    +      -       -      +
    102B  LEU*     4.0     8.6    -      -       -      +
    103B  SER*     2.8    31.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 100 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  ALA*     4.6     9.6    -      -       +      +
     80B  SER*     4.7    13.0    -      -       -      +
     96B  PHE*     2.9    52.3    +      -       +      +
     97B  MET*     3.1    15.2    +      -       +      +
     99B  ALA*     1.3    75.8    -      -       -      +
    101B  CYS*     1.3    53.6    +      -       -      +
    103B  SER*     3.3     9.5    +      -       -      +
    104B  SER*     2.8    36.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 101 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  ALA*     3.4    20.1    +      -       -      +
     63B  CYS*     2.0    53.4    -      -       -      -
     82B  ILE*     3.9    15.3    -      -       +      -
     97B  MET      2.9     8.5    +      -       -      +
     98B  MET*     3.3    10.1    -      -       -      +
    100B  LEU*     1.3    75.5    -      -       -      +
    102B  LEU*     1.3    65.4    +      -       +      +
    104B  SER*     3.0     6.2    +      -       -      -
    105B  ILE*     2.9    35.0    +      -       -      +
    190B  VAL*     4.2     8.5    -      -       -      -
    194B  LEU*     5.6     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 102 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98B  MET*     3.0    33.7    +      -       +      +
     99B  ALA*     4.0     6.5    -      -       -      +
    101B  CYS*     1.3    84.5    -      -       -      +
    103B  SER*     1.3    58.7    +      -       -      +
    105B  ILE*     3.1    18.8    +      -       +      +
    106B  TYR*     2.8    30.2    +      -       -      +
    148B  LEU*     4.2    28.9    -      -       +      +
    190B  VAL*     5.5     1.3    -      -       +      -
    194B  LEU*     4.9     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 103 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  ALA      2.8    24.6    +      -       -      -
    100B  LEU*     3.5    11.8    +      -       -      +
    102B  LEU*     1.3    72.0    -      -       -      +
    104B  SER*     1.3    65.4    +      -       -      +
    106B  TYR*     3.1     9.1    +      -       -      +
    107B  GLU*     2.9    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 104 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  SER      4.0     4.8    +      -       -      -
     59B  THR*     2.7    40.0    +      -       -      -
     62B  ALA*     4.3    10.3    -      -       -      -
    100B  LEU      2.8    14.0    +      -       -      -
    101B  CYS      3.0     9.2    +      -       -      -
    103B  SER*     1.3    78.6    +      -       -      +
    105B  ILE*     1.3    65.3    +      -       -      +
    107B  GLU*     3.1     8.3    +      -       -      +
    108B  ASP*     3.1    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 105 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  THR*     3.6    22.4    -      -       +      -
     63B  CYS*     4.1     0.7    -      -       -      -
    101B  CYS*     2.9    25.9    +      -       -      +
    102B  LEU*     3.5    16.8    -      -       +      +
    104B  SER*     1.3    73.4    -      -       -      +
    106B  TYR*     1.3    65.9    +      -       -      +
    108B  ASP*     3.0    17.2    +      -       -      +
    109B  LEU*     3.1    14.8    +      -       +      +
    144B  LEU*     5.7     0.4    -      -       +      -
    148B  LEU*     4.0    19.5    -      -       +      -
    187B  ILE*     3.6    39.3    -      -       +      -
    190B  VAL*     3.7    31.2    -      -       +      -
    191B  MET*     5.6     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 106 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102B  LEU      2.8    16.3    +      -       -      +
    103B  SER*     3.5     7.6    -      -       -      +
    105B  ILE*     1.3    77.8    -      -       -      +
    107B  GLU*     1.3    78.0    +      -       -      +
    109B  LEU*     3.5     5.1    +      -       -      +
    110B  LYS*     3.2    43.0    +      -       +      +
    145B  MET*     3.5    51.1    -      -       +      +
    148B  LEU*     3.9    34.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 107 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  SER*     2.9    22.7    +      -       -      +
    104B  SER*     3.1     9.6    +      -       -      +
    106B  TYR*     1.3    93.1    -      -       -      +
    108B  ASP*     1.3    67.5    -      -       -      +
    110B  LYS*     3.1    19.5    +      -       -      +
    111B  MET*     3.0    46.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 108 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  THR*     2.4    35.0    +      -       -      +
    104B  SER*     3.1     6.3    +      -       -      +
    105B  ILE*     3.0    10.5    +      -       -      +
    107B  GLU*     1.3    79.8    -      -       -      +
    109B  LEU*     1.3    64.3    +      -       +      +
    111B  MET*     3.3    12.9    +      -       -      +
    112B  TYR*     3.2    34.4    +      -       +      -
    180B  PHE*     6.2     0.2    -      -       -      -
    183B  ARG*     3.0    39.5    +      -       +      +
    187B  ILE*     5.1     3.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 109 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  ILE*     3.1    16.0    +      -       +      +
    106B  TYR*     3.8     5.4    -      -       -      +
    107B  GLU      3.2     0.2    -      -       -      -
    108B  ASP*     1.3    80.0    -      -       -      +
    110B  LYS*     1.3    51.7    +      -       -      +
    112B  TYR*     3.1     5.4    +      -       -      +
    113B  GLN*     2.7    36.9    +      -       -      +
    141B  ILE*     4.0    26.1    -      -       +      +
    144B  LEU*     3.6    36.3    -      -       +      -
    145B  MET*     3.6    28.0    -      -       +      -
    148B  LEU*     3.8    21.3    -      -       +      -
    180B  PHE*     4.3     9.6    -      -       +      -
    187B  ILE*     3.9    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106B  TYR*     3.2    37.3    +      -       +      +
    107B  GLU*     3.1    25.6    +      -       -      +
    109B  LEU*     1.3    74.1    -      -       -      +
    111B  MET*     1.3    69.8    +      -       +      +
    113B  GLN*     3.3     9.0    +      -       -      +
    114B  VAL*     3.3    28.9    +      -       +      +
    145B  MET*     3.8    19.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  GLU*     3.0    51.2    +      -       +      +
    108B  ASP*     3.5    16.2    -      -       -      +
    109B  LEU      3.2     0.2    -      -       -      -
    110B  LYS*     1.3    81.7    -      -       +      +
    112B  TYR*     1.3    66.5    +      -       +      +
    114B  VAL*     3.2    12.0    +      -       -      +
    115B  GLU*     3.2    20.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108B  ASP*     3.2    27.2    +      -       +      +
    109B  LEU*     3.1     7.0    +      -       -      +
    111B  MET*     1.3    81.0    -      -       +      +
    113B  GLN*     1.3    66.9    +      -       -      +
    114B  VAL      3.1     0.2    +      -       -      -
    115B  GLU*     3.2     6.9    +      -       +      +
    116B  PHE*     2.8    39.2    +      +       +      -
    141B  ILE*     3.8    17.0    -      -       +      -
    176B  LEU*     4.3    24.7    -      -       +      -
    179B  ALA*     3.4    26.3    +      -       +      +
    180B  PHE*     3.7    46.0    -      +       +      -
    183B  ARG*     4.6    16.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 113 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109B  LEU      2.7    20.6    +      -       -      +
    110B  LYS*     3.3     9.6    +      -       -      +
    112B  TYR*     1.3    75.1    -      -       -      +
    114B  VAL*     1.3    63.6    +      -       +      +
    116B  PHE*     3.7     0.7    +      -       -      -
    117B  LYS*     3.1    44.6    +      -       +      +
    138B  LEU*     4.1     9.5    -      -       +      +
    141B  ILE*     3.8    13.4    -      -       +      +
    142B  ASP*     2.9    31.0    +      -       -      +
    145B  MET*     3.4    30.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 114 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  LYS*     3.3    12.7    +      -       +      +
    111B  MET*     3.2     9.5    +      -       -      +
    112B  TYR      3.1     1.0    -      -       -      -
    113B  GLN*     1.3    78.8    -      -       +      +
    115B  GLU*     1.3    77.3    +      -       -      +
    117B  LYS*     3.2     6.6    +      -       -      +
    118B  THR*     2.9    36.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111B  MET*     3.2    15.6    +      -       +      +
    112B  TYR*     3.4    13.7    -      -       +      +
    114B  VAL*     1.3    85.1    -      -       -      +
    116B  PHE*     1.3    65.1    +      -       -      +
    118B  THR*     3.2     5.0    +      -       -      +
    119B  MET*     3.0    28.6    +      -       -      +
    172B  LYS*     3.3    26.7    +      -       -      -
    176B  LEU*     3.8    31.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112B  TYR*     2.8    40.5    +      +       -      +
    115B  GLU*     1.3    74.6    -      -       -      +
    117B  LYS*     1.3    57.1    +      -       -      +
    119B  MET*     3.3     4.5    +      -       +      +
    120B  ASN*     2.9    31.5    +      -       -      +
    134B  ASP*     3.9    27.3    -      -       +      +
    137B  MET*     3.9    21.8    -      -       +      -
    138B  LEU*     4.0    23.9    -      -       +      +
    141B  ILE*     3.5    28.0    -      -       +      -
    173B  LEU*     5.0     4.9    -      -       +      -
    176B  LEU*     3.5    29.6    -      -       +      -
    177B  LEU*     3.9    22.4    -      -       +      -
    180B  PHE*     4.0    15.0    -      +       +      -
----------------------------------------------------------
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Residues in contact with LYS 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  GLN*     3.1    39.4    +      -       +      +
    114B  VAL*     3.2     6.7    +      -       -      +
    116B  PHE*     1.3    71.6    -      -       -      +
    118B  THR*     1.3    66.5    +      -       -      +
    120B  ASN*     3.8     6.7    -      -       -      +
    121B  ALA*     3.0    23.2    +      -       -      +
    138B  LEU*     4.4    16.6    -      -       +      -
    142B  ASP*     4.9     6.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  VAL*     2.9    26.9    +      -       -      +
    115B  GLU*     3.6     6.7    -      -       -      -
    117B  LYS*     1.3    74.9    -      -       -      +
    119B  MET*     1.3    63.3    +      -       -      +
    121B  ALA*     3.1     9.3    +      -       -      +
    122B  LYS*     3.0    50.7    +      -       +      +
    172B  LYS*     4.7     4.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115B  GLU      3.0    18.8    +      -       -      +
    116B  PHE*     3.5    10.3    -      -       +      +
    118B  THR*     1.3    76.7    -      -       -      +
    120B  ASN*     1.3    54.8    +      -       -      +
    122B  LYS*     3.0    11.2    +      -       +      +
    123B  LEU*     2.7    65.7    +      -       +      +
    134B  ASP*     6.4     0.4    -      -       +      -
    169B  THR*     3.9    15.5    -      -       +      +
    172B  LYS*     4.0    34.5    -      -       -      +
    173B  LEU*     3.7    39.7    -      -       +      -
    176B  LEU*     4.6    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  PHE      2.9    18.0    +      -       -      +
    117B  LYS*     3.8     7.2    +      -       -      +
    119B  MET*     1.3    77.4    -      -       -      +
    121B  ALA*     1.3    63.4    +      -       -      +
    123B  LEU*     4.0     6.0    -      -       -      +
    124B  LEU*     3.2    26.3    +      -       -      +
    130B  GLN*     3.2    29.9    -      -       -      +
    134B  ASP*     3.9     8.8    -      -       -      +
    135B  GLN*     4.0    10.1    -      -       -      +
    138B  LEU*     5.4     9.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  LYS      3.0    15.3    +      -       -      +
    118B  THR*     3.3    10.5    -      -       -      +
    119B  MET      3.0     0.2    -      -       -      -
    120B  ASN*     1.3    77.9    -      -       -      +
    122B  LYS*     1.3    71.7    +      -       +      +
    124B  LEU*     3.3    14.3    +      -       -      +
    125B  MET*     3.8     9.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118B  THR*     3.0    33.1    +      -       +      +
    119B  MET*     3.0    14.2    +      -       +      +
    121B  ALA*     1.3    84.4    -      -       -      +
    123B  LEU*     1.3    55.0    +      -       -      +
    124B  LEU      2.7    10.9    +      -       -      -
    125B  MET*     3.3    20.3    +      -       -      +
    169B  THR*     3.3    31.4    -      -       +      +
    172B  LYS*     3.3    37.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119B  MET*     2.7    31.4    +      -       +      +
    120B  ASN*     4.0     5.8    -      -       -      +
    122B  LYS*     1.3    71.0    -      -       -      +
    124B  LEU*     1.3    60.5    +      -       -      +
    125B  MET      3.0     3.9    +      -       -      -
    126B  ASP*     3.1    24.4    +      -       +      +
    129B  ARG      3.7     7.8    -      -       -      +
    130B  GLN*     3.7    34.1    -      -       +      +
    131B  ILE*     5.2     1.3    -      -       +      -
    134B  ASP*     5.0     1.1    -      -       -      +
    169B  THR*     3.0    38.6    -      -       +      +
    170B  LYS*     4.9    11.9    -      -       +      -
    173B  LEU*     3.4    35.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  ASN*     3.2    19.1    +      -       -      +
    121B  ALA*     3.5    14.4    -      -       -      +
    122B  LYS      2.7     7.7    +      -       -      -
    123B  LEU*     1.3    72.6    -      -       -      +
    125B  MET*     1.3    69.9    +      -       +      +
    126B  ASP      3.2     1.6    +      -       -      +
    129B  ARG*     2.9    51.8    +      -       +      +
    130B  GLN*     5.0     6.5    -      -       +      +
----------------------------------------------------------
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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