Contacts of the helix formed by residues 112 - 137 (chain F) in PDB entry 2Y1M


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 ASN 112 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108F  THR      3.0     8.5    +      -       -      +
    109F  LEU*     3.0    22.3    +      -       +      +
    111F  GLU*     1.3    72.6    -      -       -      +
    113F  GLU*     1.3    65.1    +      -       -      +
    114F  TYR      4.3     2.0    -      -       -      +
    115F  PHE*     3.0    41.4    +      -       +      +
    116F  ARG*     3.1    14.3    +      -       -      +
    169F  PHE*     3.5    15.5    -      -       -      -
    174F  PHE*     3.4    40.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 113 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47F  PRO*     5.8     2.4    -      -       -      +
     48F  PRO*     4.6     8.1    -      -       -      +
    111F  GLU      2.9     8.8    +      -       -      +
    112F  ASN*     1.3    72.4    -      -       -      +
    114F  TYR*     1.3    62.9    +      -       -      +
    116F  ARG*     3.3    32.1    +      -       -      +
    117F  VAL*     3.1    38.0    +      -       -      +
    199F  ILE*     4.3    19.2    -      -       +      +
    235F  TYR*     5.1     7.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 114 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112F  ASN*     3.4     6.9    +      -       -      +
    113F  GLU*     1.3    77.2    -      -       -      +
    115F  PHE*     1.3    63.7    +      -       -      +
    117F  VAL*     3.3     2.3    +      -       -      +
    118F  PHE*     2.8    52.8    +      +       +      -
    164F  GLU*     3.0    47.5    +      -       +      +
    165F  LEU*     3.6    22.8    -      -       +      -
    168F  ILE*     3.9    24.0    -      -       +      -
    169F  PHE*     3.9    13.7    -      +       -      -
    174F  PHE*     4.4     5.6    -      -       +      -
    198F  THR*     3.7    33.0    -      -       +      -
    199F  ILE*     4.1    31.0    -      -       +      +
    237F  SER*     4.5     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 115 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51F  VAL*     4.1    20.6    -      -       +      -
     56F  VAL*     5.0     8.3    -      -       +      -
     95F  LEU*     3.5    29.8    -      -       +      -
     98F  ILE*     4.5    11.7    -      -       +      -
     99F  LEU*     5.4     5.6    -      -       +      -
    109F  LEU*     3.7    42.8    -      -       +      -
    112F  ASN*     3.0    29.7    +      -       +      +
    114F  TYR*     1.3    79.3    -      -       -      +
    116F  ARG*     1.3    67.2    +      -       -      +
    118F  PHE*     3.4     3.1    +      +       +      +
    119F  MET*     3.0    53.3    +      -       +      +
    165F  LEU*     5.3     5.4    -      -       +      -
    169F  PHE*     4.2    17.9    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 116 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48F  PRO*     3.1    37.4    +      -       +      -
     49F  GLY      3.1    25.6    -      -       -      +
     50F  THR*     3.5    14.4    -      -       -      +
     51F  VAL*     3.5    20.3    -      -       +      +
     55F  MET*     5.1     1.2    -      -       +      +
    110F  GLY      3.2    13.9    +      -       -      +
    111F  GLU*     3.0    33.7    +      -       -      +
    112F  ASN      3.1     6.6    +      -       -      +
    113F  GLU*     3.3    42.6    +      -       -      +
    115F  PHE*     1.3    77.0    -      -       -      +
    117F  VAL*     1.3    64.6    +      -       -      +
    119F  MET*     2.9     5.9    +      -       -      +
    120F  GLU*     2.9    22.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 117 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48F  PRO*     3.9    19.7    -      -       +      -
    113F  GLU*     3.1    22.5    +      -       -      +
    114F  TYR*     3.5     9.2    -      -       +      +
    116F  ARG*     1.3    79.0    -      -       -      +
    118F  PHE*     1.3    64.4    +      -       -      +
    120F  GLU*     3.3     5.2    +      -       -      +
    121F  ASN*     2.9    22.2    +      -       +      +
    199F  ILE*     4.1    19.1    -      -       +      -
    233F  ASN*     3.6    26.0    -      -       +      +
    235F  TYR*     3.7    39.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 118 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91F  THR*     4.5    10.3    -      -       +      -
     95F  LEU*     4.5     6.3    -      -       +      -
    114F  TYR*     2.8    50.3    +      +       +      +
    115F  PHE*     3.8     5.4    -      +       -      +
    117F  VAL*     1.3    76.3    -      -       -      +
    119F  MET*     1.3    64.5    +      -       +      +
    121F  ASN*     3.4     7.2    +      -       -      +
    122F  LEU*     2.7    55.1    +      -       +      +
    161F  MET*     3.2    49.9    -      -       +      +
    164F  GLU*     4.1     7.9    -      -       -      +
    165F  LEU*     3.8    34.5    -      -       +      -
    233F  ASN*     5.5     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 119 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51F  VAL*     4.4     7.9    -      -       +      -
     55F  MET*     3.8    18.8    -      -       +      +
     56F  VAL*     3.7    27.8    -      -       +      +
     59F  CYS*     3.6    32.8    -      -       +      -
     60F  TRP*     5.6     0.2    -      -       -      +
     95F  LEU*     3.9    24.9    -      -       +      -
    115F  PHE*     3.0    38.7    +      -       +      +
    116F  ARG      2.9     8.9    +      -       -      +
    118F  PHE*     1.3    76.4    -      -       -      +
    120F  GLU*     1.3    68.0    +      -       -      +
    122F  LEU*     2.8    31.5    +      -       +      +
    123F  MET*     2.8    15.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 120 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47F  PRO      4.9     0.3    -      -       -      -
     48F  PRO*     3.3    46.6    -      -       +      +
     55F  MET*     3.9    13.1    -      -       +      +
    116F  ARG*     2.9    14.9    +      -       +      +
    117F  VAL*     3.7     8.0    -      -       -      +
    119F  MET*     1.3    73.5    -      -       -      +
    121F  ASN*     1.3    61.5    +      -       -      +
    123F  MET*     3.4     3.8    +      -       -      +
    124F  LYS*     3.2    37.7    +      -       +      +
    235F  TYR*     5.0     6.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 121 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117F  VAL*     2.9    16.7    +      -       +      +
    118F  PHE*     3.8     6.1    +      -       -      +
    120F  GLU*     1.3    75.3    +      -       -      +
    122F  LEU*     1.3    63.6    +      -       -      +
    124F  LYS*     4.4    10.9    +      -       +      +
    125F  LYS*     2.9    54.2    +      -       -      +
    161F  MET*     3.8    26.3    -      -       -      +
    231F  THR*     3.2    23.1    +      -       -      +
    232F  CYS      3.8     0.2    -      -       -      +
    233F  ASN*     3.6    27.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 122 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59F  CYS*     3.7    12.3    -      -       -      -
     63F  MET*     4.4    17.3    -      -       +      -
     88F  LEU*     6.0     0.9    -      -       +      -
     91F  THR*     4.5    12.1    -      -       +      -
     95F  LEU*     3.4    33.0    -      -       +      -
    118F  PHE*     2.7    32.1    +      -       +      +
    119F  MET*     2.8    27.3    +      -       +      +
    121F  ASN*     1.3    72.8    -      -       -      +
    123F  MET*     1.3    54.7    -      -       -      +
    125F  LYS*     4.4     1.0    -      -       -      +
    126F  THR*     2.6    39.8    +      -       -      +
    158F  PHE*     4.7     7.4    -      -       +      -
    161F  MET*     3.5    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 123 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55F  MET*     3.8    28.0    -      -       +      -
     58F  LYS*     3.8    25.1    -      -       +      -
     59F  CYS*     3.8    31.6    -      -       +      -
     62F  LEU*     3.6    16.8    -      -       +      -
    119F  MET      2.8    12.4    +      -       -      +
    120F  GLU*     3.8     5.4    -      -       -      +
    122F  LEU*     1.3    76.5    -      -       -      +
    124F  LYS*     1.3    60.3    +      -       +      +
    126F  THR*     3.0     5.1    +      -       -      -
    127F  LYS*     2.9    54.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 124 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120F  GLU*     3.2    28.3    +      -       +      +
    121F  ASN*     3.9    12.7    +      -       +      +
    123F  MET*     1.3    77.9    -      -       +      +
    125F  LYS*     1.3    74.2    +      -       -      +
    127F  LYS*     3.5     6.4    +      -       -      +
    128F  GLN*     2.8    33.6    +      -       -      +
    232F  CYS      5.1     4.2    +      -       -      -
    233F  ASN*     5.5     5.5    +      -       -      +
    234F  ASP*     5.6     4.0    +      -       -      -
    386F  GLU*     5.9     2.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 125 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121F  ASN*     2.9    44.2    +      -       -      +
    122F  LEU      4.5     0.2    -      -       -      +
    124F  LYS*     1.3    90.4    -      -       -      +
    126F  THR*     1.3    54.0    +      -       -      +
    128F  GLN*     3.7    19.7    +      -       -      +
    129F  THR*     2.6    34.0    +      -       -      -
    154F  LEU*     4.0    19.4    -      -       +      +
    157F  ILE*     4.0    17.9    -      -       +      -
    158F  PHE*     4.2    19.7    -      -       +      -
    161F  MET*     4.1     9.2    -      -       +      -
    231F  THR      3.6     8.7    -      -       -      -
    232F  CYS*     3.2    34.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 126 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59F  CYS*     5.4     0.8    -      -       -      -
     62F  LEU*     3.4    47.6    -      -       +      +
     63F  MET*     3.8    12.5    -      -       +      +
     66F  VAL*     3.6     9.6    -      -       +      +
     88F  LEU*     5.3     0.6    -      -       +      +
    122F  LEU*     2.6    31.9    +      -       -      +
    123F  MET*     3.0     8.6    +      -       -      -
    125F  LYS*     1.3    76.5    -      -       -      +
    127F  LYS*     1.3    60.9    +      -       -      +
    129F  THR*     2.9    21.4    +      -       -      -
    130F  ILE*     3.0    16.3    +      -       +      +
    158F  PHE*     4.3    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 127 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58F  LYS*     5.0     8.8    -      -       -      +
     62F  LEU*     3.7    21.5    -      -       +      -
    123F  MET*     2.9    46.3    +      -       +      +
    124F  LYS*     3.9     6.1    -      -       -      +
    126F  THR*     1.3    76.5    -      -       -      +
    128F  GLN*     1.3    51.7    +      -       -      +
    130F  ILE*     2.7    16.7    +      -       +      +
    131F  SER*     2.6    38.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 128 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124F  LYS*     2.8    23.9    +      -       -      +
    125F  LYS*     3.7    26.7    +      -       -      +
    127F  LYS*     1.3    72.1    -      -       -      +
    129F  THR*     1.3    57.5    +      -       -      +
    131F  SER*     4.2     7.1    -      -       -      -
    132F  LEU*     3.3    24.9    +      -       -      +
    150F  ASN*     4.9     4.2    +      -       -      -
    154F  LEU*     3.9    28.1    -      -       +      +
    157F  ILE*     6.3     0.4    -      -       -      +
    384F  CYS      5.1     1.8    +      -       -      +
    385F  ALA      3.7    10.9    +      -       -      -
    386F  GLU*     3.2    52.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 129 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66F  VAL*     3.8    27.1    -      -       +      -
    125F  LYS      2.6    19.5    +      -       -      -
    126F  THR      2.9     9.2    +      -       -      -
    128F  GLN*     1.3    77.1    -      -       -      +
    130F  ILE*     1.3    64.5    +      -       -      +
    131F  SER      3.3     0.2    -      -       -      -
    132F  LEU*     3.6     5.0    +      -       +      +
    133F  PHE*     3.0    35.7    +      -       +      -
    151F  LEU*     3.3    34.1    -      -       +      -
    154F  LEU*     3.8    15.9    -      -       +      +
    158F  PHE*     3.8    13.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 130 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62F  LEU*     3.8    44.9    -      -       +      +
     65F  LYS*     4.6    16.8    -      -       +      -
     66F  VAL*     3.6    13.9    -      -       +      +
     69F  LEU*     4.6    16.9    -      -       +      +
    126F  THR      3.0    17.0    +      -       -      +
    127F  LYS*     2.7    16.8    +      -       +      +
    129F  THR*     1.3    76.7    -      -       -      +
    131F  SER*     1.3    62.1    +      -       -      +
    133F  PHE*     3.2     7.3    +      -       -      +
    134F  LYS*     3.1    22.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 131 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127F  LYS      2.6    18.4    +      -       -      -
    128F  GLN*     4.2     8.8    +      -       -      +
    130F  ILE*     1.3    69.8    -      -       -      +
    132F  LEU*     1.3    60.7    +      -       -      -
    133F  PHE      3.0     2.0    -      -       -      -
    134F  LYS*     2.8    26.4    +      -       -      +
    135F  GLU*     2.9    38.8    +      -       -      +
    386F  GLU*     5.3     4.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 132 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128F  GLN      3.3    19.2    +      -       -      +
    129F  THR      3.8     4.9    -      -       -      +
    130F  ILE      3.4     0.2    -      -       -      -
    131F  SER*     1.3    78.5    +      -       -      +
    133F  PHE*     1.3    57.7    +      -       +      +
    135F  GLU*     4.9     2.9    -      -       -      -
    136F  GLY*     3.1    21.4    +      -       -      +
    140F  MET*     3.3    14.4    -      -       +      +
    147F  PRO*     3.4    40.8    -      -       +      +
    150F  ASN*     3.7    20.0    -      -       +      +
    151F  LEU*     3.5    37.0    -      -       +      +
    154F  LEU*     4.1    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 133 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310D  ALA*     4.1     4.9    -      -       -      +
     66F  VAL*     5.1     0.9    -      -       +      -
     69F  LEU*     3.8    58.3    -      -       +      -
     70F  CYS*     4.1     7.9    -      -       -      -
     75F  LEU*     3.7    14.8    -      -       +      -
    129F  THR*     3.0    28.0    +      -       +      -
    130F  ILE      3.2     8.2    +      -       -      +
    131F  SER      3.0     0.8    -      -       -      -
    132F  LEU*     1.3    76.5    -      -       +      +
    134F  LYS*     1.3    57.0    +      -       -      +
    135F  GLU      3.2     5.2    -      -       -      -
    137F  LYS*     3.1    26.9    +      -       -      +
    140F  MET*     3.4    39.6    -      -       +      +
    141F  TYR*     5.7     3.8    -      +       -      -
    151F  LEU*     3.8    35.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 134 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310D  ALA*     3.7    20.6    -      -       -      +
    311D  ASP*     3.5    42.5    +      -       -      +
    130F  ILE*     3.1    14.8    +      -       +      +
    131F  SER*     2.8    11.9    +      -       -      +
    133F  PHE*     1.3    77.6    -      -       -      +
    135F  GLU*     1.3    70.8    +      -       -      +
    137F  LYS*     3.2    24.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 135 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131F  SER*     2.9    36.0    +      -       -      +
    132F  LEU*     4.7     2.6    -      -       -      +
    134F  LYS*     1.3    98.1    +      -       +      +
    136F  GLY*     1.3    65.9    +      -       -      +
    137F  LYS*     3.1    13.2    +      -       -      +
    139F  ARG*     5.2     3.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 136 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132F  LEU*     3.1    18.7    +      -       -      +
    135F  GLU*     1.3    77.3    -      -       -      +
    137F  LYS*     1.3    63.5    +      -       -      +
    139F  ARG*     2.8    39.0    +      -       -      +
    140F  MET*     4.1     2.5    -      -       -      -
    147F  PRO*     4.2    23.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 137 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310D  ALA*     3.4    23.3    -      -       +      -
    311D  ASP*     2.9    38.4    +      -       -      -
    133F  PHE      3.1    15.4    +      -       -      -
    134F  LYS      3.2    16.9    +      -       -      +
    135F  GLU*     3.1    11.4    +      -       -      +
    136F  GLY*     1.3    77.9    -      -       -      +
    138F  GLU*     1.3    76.4    +      -       +      +
    139F  ARG*     5.7     0.2    -      -       +      -
    140F  MET*     2.8    37.1    +      -       -      +
    141F  TYR*     4.2     6.4    -      -       -      -
----------------------------------------------------------
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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