Contacts of the helix formed by residues 108 - 133 (chain C) in PDB entry 2AXT


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 108 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72C  LEU*     2.7    36.8    -      -       +      +
     75C  PHE*     5.2     3.5    -      -       -      -
    105C  VAL*     5.4     6.1    -      -       -      +
    107C  ASP*     1.3    74.0    +      -       -      +
    109C  PHE*     1.3    58.8    +      -       +      +
    110C  PRO      3.4     0.4    -      -       -      -
    111C  PHE*     2.8    44.9    +      -       -      +
    112C  PHE*     3.4     2.8    +      -       +      -
     10K  LYS*     3.8    21.0    +      -       +      +
     12K  PRO*     5.1    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 109 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107C  ASP*     2.9    19.3    +      -       -      +
    108C  THR*     1.3    82.5    -      -       +      +
    110C  PRO*     1.3    65.3    -      -       +      +
    111C  PHE      2.8     0.9    +      -       -      -
    112C  PHE*     2.9    28.5    +      +       +      +
    113C  VAL*     2.6    54.5    +      -       +      +
    505C  BCR      4.0    18.8    -      -       +      -
     12K  PRO*     5.2     9.0    -      -       +      -
     58Z  ASN*     4.1    15.5    -      -       -      -
     59Z  PHE*     4.2    23.1    -      +       -      -
     62Z  VAL*     5.5     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PRO 110 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92C  ILE*     5.0     0.4    -      -       -      -
     97C  TRP*     3.9    41.1    -      -       +      +
     98C  GLY*     4.1    12.8    -      -       -      +
    107C  ASP*     2.8    39.5    -      -       +      +
    108C  THR      3.4     0.9    -      -       -      -
    109C  PHE*     1.3    80.4    -      -       +      +
    111C  PHE*     1.3    56.5    -      -       +      +
    113C  VAL*     3.2     9.8    -      -       +      +
    114C  VAL*     2.8    36.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  THR*     3.7     9.9    -      -       +      +
     72C  LEU*     4.4    17.9    -      -       +      -
     75C  PHE*     5.4     6.1    -      +       -      -
     81C  MET*     5.8     2.2    -      -       +      -
     89C  ILE*     3.5    42.6    -      -       +      -
     92C  ILE*     3.8    35.9    -      -       +      -
     93C  ALA*     4.1    10.1    -      -       +      -
     97C  TRP      3.3    26.7    -      -       -      -
     98C  GLY      4.3     8.3    -      -       -      -
     99C  VAL*     5.3     0.4    -      -       +      -
    105C  VAL*     4.9    12.8    -      -       +      -
    107C  ASP      4.3     9.2    -      -       -      -
    108C  THR*     2.8    30.6    +      -       -      +
    110C  PRO*     1.3    73.4    -      -       -      +
    112C  PHE*     1.3    65.3    +      -       -      +
    114C  VAL*     3.1     2.3    +      -       -      +
    115C  GLY      2.9    21.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 112 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  LEU*     3.8    20.6    -      -       +      +
     72C  LEU*     3.6    16.4    -      -       +      +
    108C  THR*     3.4     2.7    +      -       -      +
    109C  PHE*     2.9    34.3    +      +       +      +
    111C  PHE*     1.3    76.3    -      -       -      +
    113C  VAL*     1.3    66.8    +      -       -      +
    115C  GLY*     3.3     0.9    +      -       -      -
    116C  VAL*     3.1    24.8    +      -       +      +
    504C  BCR      4.0    24.7    -      -       +      -
    505C  BCR      3.6    26.5    -      -       +      -
     11K  LEU*     4.0    26.2    -      -       +      -
     12K  PRO*     4.6    12.1    -      -       +      -
     15K  TYR*     3.5    42.0    -      +       -      -
     58Z  ASN*     4.0     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 113 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109C  PHE*     2.6    63.3    +      -       +      +
    110C  PRO*     3.2    10.3    -      -       +      +
    112C  PHE*     1.3    74.5    -      -       -      +
    114C  VAL*     1.3    69.2    +      -       +      +
    116C  VAL*     3.1    14.7    -      -       -      +
    117C  VAL*     3.1    31.0    -      -       +      +
    477C  UNK      5.0     4.9    -      -       +      -
    505C  BCR      4.7    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 114 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92C  ILE*     3.9    22.9    -      -       +      -
     97C  TRP*     4.9     9.0    -      -       +      -
    110C  PRO*     2.8    23.7    +      -       +      +
    111C  PHE      3.8     2.9    -      -       -      +
    113C  VAL*     1.3    78.1    -      -       +      +
    115C  GLY*     1.3    65.1    +      -       -      +
    117C  VAL*     3.6     1.0    +      -       -      +
    118C  HIS*     3.2    32.9    +      -       +      -
    477C  UNK      4.1    15.5    -      -       +      -
    493C  CLA      3.5    59.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 115 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64C  ALA      4.9     0.2    -      -       -      -
     65C  GLY*     3.0    33.1    -      -       -      +
     68C  THR*     3.6    31.4    -      -       -      +
     69C  LEU*     4.2     5.4    -      -       -      -
    111C  PHE      2.9    12.9    +      -       -      -
    112C  PHE      3.7     1.3    -      -       -      -
    114C  VAL*     1.3    79.6    -      -       -      +
    116C  VAL*     1.3    60.9    +      -       -      +
    118C  HIS      3.5     0.3    +      -       -      -
    119C  LEU      3.2     3.8    +      -       -      -
    493C  CLA      5.2     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 116 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  LEU*     4.2     9.8    -      -       +      +
    112C  PHE*     3.1    16.4    +      -       +      +
    113C  VAL*     3.1    17.5    -      -       -      +
    115C  GLY*     1.3    70.9    -      -       -      +
    117C  VAL*     1.3    80.8    +      -       +      +
    118C  HIS      3.0     2.2    -      -       -      -
    119C  LEU*     2.7    20.9    +      -       +      +
    120C  ILE*     2.9    26.6    +      -       +      +
    504C  BCR      3.4    25.4    -      -       +      -
    505C  BCR      3.3    41.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113C  VAL*     3.1    26.9    +      -       +      +
    114C  VAL      3.8     1.3    -      -       -      +
    115C  GLY      3.6     0.2    -      -       -      -
    116C  VAL*     1.3    87.0    -      -       +      +
    118C  HIS*     1.3    61.9    +      -       -      +
    120C  ILE*     3.2    11.3    +      -       -      +
    121C  SER*     2.8    30.9    +      -       -      +
    477C  UNK      3.3    46.4    -      -       +      -
    505C  BCR      5.0    27.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  VAL*     3.0    30.1    -      -       +      +
     64C  ALA*     3.5    23.1    -      -       +      -
     65C  GLY*     3.7    11.7    -      -       -      +
    114C  VAL*     3.2    26.1    +      -       +      +
    115C  GLY      3.6     9.4    -      -       -      +
    116C  VAL      3.0     0.8    -      -       -      -
    117C  VAL*     1.3    79.2    -      -       -      +
    119C  LEU*     1.3    54.9    +      -       -      +
    120C  ILE      2.8    11.4    +      -       -      -
    121C  SER*     2.9    11.1    +      -       -      -
    122C  SER*     3.0    10.2    +      -       -      -
    477C  UNK      3.3    33.4    -      -       +      +
    493C  CLA      2.3    57.1    +      +       -      -
----------------------------------------------------------
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Residues in contact with LEU 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  PHE*     3.5    36.8    -      -       +      -
     65C  GLY*     3.9     7.1    -      -       -      -
     66C  ALA*     4.1    15.7    -      -       +      +
     69C  LEU*     4.1    15.9    -      -       +      -
    115C  GLY      3.2     9.9    +      -       -      +
    116C  VAL*     2.7    18.1    +      -       +      +
    118C  HIS*     1.3    74.1    -      -       -      +
    120C  ILE*     1.3    53.3    +      -       -      -
    122C  SER*     2.5    23.5    +      -       -      -
    504C  BCR      3.4    59.2    -      -       +      +
     25K  LEU*     4.1    13.0    -      -       +      -
    130X  BCR      4.8     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116C  VAL*     2.9    34.5    +      -       +      +
    117C  VAL      3.5     5.2    -      -       -      +
    118C  HIS      2.8     1.0    +      -       -      -
    119C  LEU*     1.3    77.4    -      -       -      +
    121C  SER*     1.3    53.9    +      -       -      +
    122C  SER      2.6     5.8    +      -       -      -
    123C  ALA*     2.6    34.8    +      -       -      +
    124C  VAL*     3.4     4.9    +      -       +      +
    504C  BCR      4.4    17.0    -      -       +      -
    505C  BCR      3.6    52.7    -      -       +      -
     47Z  TRP*     3.6    29.2    -      -       +      -
     51Z  VAL*     4.0    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61C  VAL*     4.4     2.2    -      -       -      -
    117C  VAL*     2.8    19.8    +      -       -      +
    118C  HIS      2.9     3.3    +      -       -      -
    120C  ILE*     1.3    74.6    -      -       -      +
    122C  SER*     1.3    56.2    +      -       -      +
    123C  ALA      3.3     0.2    -      -       -      -
    124C  VAL*     3.8     2.9    -      -       -      -
    125C  LEU*     3.2    32.2    +      -       -      +
    477C  UNK      3.4    34.9    -      -       -      +
    505C  BCR      3.4    40.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58C  GLY      3.8     6.7    -      -       -      -
     61C  VAL*     4.4     4.5    -      -       -      -
     62C  PHE*     3.6    42.1    -      -       -      -
    118C  HIS      3.0     5.5    +      -       -      -
    119C  LEU      2.5    26.3    +      -       -      -
    120C  ILE      2.6     1.2    +      -       -      -
    121C  SER*     1.3    76.8    -      -       -      +
    123C  ALA*     1.3    55.2    +      -       -      -
    124C  VAL      3.2     0.2    -      -       -      -
    125C  LEU*     4.0     3.7    -      -       -      +
    126C  GLY*     2.6    32.9    +      -       -      -
    504C  BCR      3.3    21.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120C  ILE      2.6    17.6    +      -       -      +
    122C  SER*     1.3    73.1    +      -       -      +
    124C  VAL*     1.3    58.8    +      -       -      +
    126C  GLY*     3.7     0.3    -      -       -      -
    127C  PHE*     2.8    31.4    +      -       -      +
    501C  CLA      3.8     7.6    -      -       +      +
    504C  BCR      3.7    28.7    -      -       +      -
     47Z  TRP*     3.6    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120C  ILE*     4.0    13.0    -      -       +      +
    121C  SER*     3.5     1.6    -      -       -      +
    122C  SER      3.2     0.2    -      -       -      -
    123C  ALA*     1.3    76.9    -      -       +      +
    125C  LEU*     1.3    67.8    +      -       -      +
    127C  PHE*     2.8    19.9    +      -       -      +
    128C  GLY      3.1     8.7    +      -       -      -
    503C  CLA      3.7    24.0    -      -       +      +
    505C  BCR      3.3    59.2    -      -       +      -
     47Z  TRP*     5.4     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  VAL*     3.0    23.5    -      -       +      +
     57C  ALA*     3.2    27.6    -      -       +      +
     58C  GLY*     4.0    12.6    -      -       -      -
     61C  VAL*     3.7    17.0    -      -       +      -
    121C  SER      3.2    17.6    +      -       -      +
    122C  SER      4.0     0.4    -      -       -      +
    124C  VAL*     1.3    79.8    -      -       -      +
    126C  GLY*     1.3    57.6    +      -       -      +
    128C  GLY      3.0     1.4    +      -       -      -
    129C  GLY*     3.0    24.6    +      -       -      -
    477C  UNK      5.3     1.8    -      -       +      -
    493C  CLA      5.1     3.8    -      -       +      -
    502C  CLA      4.5    18.2    -      -       -      +
    503C  CLA      3.9    19.3    -      -       +      -
    505C  BCR      3.6    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 126 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  ALA*     5.0     3.4    -      -       -      -
    122C  SER      2.6    23.7    +      -       -      -
    123C  ALA      3.7     1.6    -      -       -      -
    125C  LEU*     1.3    73.2    -      -       -      +
    127C  PHE*     1.3    60.6    +      -       -      +
    129C  GLY*     3.5     0.7    +      -       -      -
    130C  VAL*     3.1    31.6    +      -       -      +
    501C  CLA      3.7     6.3    -      -       -      -
    504C  BCR      3.7    28.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 127 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123C  ALA      2.8    13.3    +      -       -      +
    124C  VAL*     2.8    14.6    +      -       -      +
    126C  GLY*     1.3    76.2    -      -       -      +
    128C  GLY*     1.3    60.9    +      -       -      +
    130C  VAL*     4.2     2.4    -      -       -      +
    131C  TYR*     3.1    28.0    +      -       +      +
    501C  CLA      3.4    24.6    -      -       +      +
    503C  CLA      4.0    30.1    -      -       +      -
     19Z  MET*     4.7     3.1    -      -       +      -
     23Z  VAL*     3.6    31.0    -      -       +      -
     27Z  TYR*     3.6    22.8    -      -       -      -
     40Z  ILE*     4.1    11.7    -      -       +      -
     44Z  SER*     4.0    21.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 128 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  VAL*     3.9     4.0    -      -       -      -
    124C  VAL      3.1     6.5    +      -       -      -
    125C  LEU      3.0     7.0    +      -       -      -
    127C  PHE*     1.3    74.9    -      -       -      +
    129C  GLY*     1.3    56.8    +      -       -      +
    131C  TYR*     3.2     3.8    +      -       -      +
    132C  HIS*     2.7    41.1    +      -       -      +
    503C  CLA      3.2    35.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 129 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51C  GLY*     3.3    25.0    -      -       -      -
     54C  VAL*     3.3     5.1    -      -       -      +
     55C  ALA*     3.5    18.8    -      -       -      -
    125C  LEU      3.0    10.9    +      -       -      -
    126C  GLY      3.9     0.2    -      -       -      -
    128C  GLY*     1.3    78.1    -      -       -      +
    130C  VAL*     1.3    63.9    +      -       -      +
    132C  HIS*     3.1     0.7    +      -       -      -
    133C  ALA*     3.0    24.5    +      -       -      +
    504C  BCR      5.2     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 130 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55C  ALA*     4.4     2.0    -      -       -      +
    126C  GLY      3.1    18.7    +      -       -      +
    127C  PHE*     4.2     2.7    -      -       -      +
    129C  GLY*     1.3    73.0    -      -       -      +
    131C  TYR*     1.3    62.9    +      -       -      +
    133C  ALA      3.7     0.2    +      -       -      -
    134C  ILE*     3.0    50.2    +      -       +      +
    501C  CLA      3.8    51.4    -      -       +      -
    504C  BCR      4.4    14.8    -      -       +      -
     23Z  VAL*     4.3    12.6    -      -       +      -
     24Z  PRO*     4.4     6.7    -      -       +      -
     27Z  TYR*     4.3    12.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 131 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127C  PHE*     3.1    24.0    +      -       +      +
    128C  GLY      3.4     1.6    -      -       -      +
    129C  GLY      2.9     1.2    +      -       -      -
    130C  VAL*     1.3    77.0    -      -       -      +
    132C  HIS*     1.3    82.0    +      +       -      +
    133C  ALA      3.1     0.2    -      -       -      -
    134C  ILE      2.9    18.0    +      -       -      -
    135C  ARG*     3.0    30.7    +      -       +      -
    136C  GLY*     3.0    32.7    +      -       -      -
    137C  PRO*     3.9     1.0    -      -       -      +
    503C  CLA      2.5    80.4    +      +       +      -
     27Z  TYR*     3.5    33.6    -      +       +      +
----------------------------------------------------------
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Residues in contact with HIS 132 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47C  GLY      3.0    17.0    +      -       -      +
     48C  LYS*     2.8    19.9    +      -       -      -
     50C  LEU*     3.5    25.7    -      -       +      +
     51C  GLY*     3.5    18.6    -      -       -      +
     54C  VAL*     5.0     1.6    -      -       +      -
    128C  GLY      2.7    24.2    +      -       -      +
    131C  TYR*     1.3    83.2    -      +       -      +
    133C  ALA*     1.3    54.7    +      -       -      +
    134C  ILE      3.4     1.3    -      -       -      -
    136C  GLY*     4.6     5.8    -      -       -      -
    137C  PRO*     4.1     6.9    +      -       +      +
    140C  LEU*     5.1     4.8    -      -       +      +
    503C  CLA      2.4    84.7    +      +       +      -
----------------------------------------------------------
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Residues in contact with ALA 133 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48C  LYS*     2.8    21.9    +      -       -      +
     51C  GLY*     4.1     8.7    -      -       -      -
    129C  GLY      3.0    15.4    +      -       -      +
    130C  VAL      4.4     1.1    -      -       -      +
    132C  HIS*     1.3    75.5    -      -       -      +
    134C  ILE*     1.3    65.3    +      -       +      +
    501C  CLA      3.7    37.9    -      -       +      +
    504C  BCR      4.0    24.5    -      -       +      -
----------------------------------------------------------
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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