Contacts of the helix formed by residues 109 - 137 (chain B) in PDB entry 1JT0


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 109 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47B  GLU*     6.1     0.4    -      -       -      +
    106B  TYR*     2.8    39.8    +      -       +      +
    108B  LYS*     1.3    71.7    -      -       -      +
    110B  ASN*     1.3    66.6    +      -       -      +
    111B  SER*     3.3     4.5    -      -       -      -
    112B  ILE*     3.2    17.1    +      -       +      +
    113B  ASN*     3.0    18.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 110 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107B  TYR      5.6     0.2    -      -       -      +
    108B  LYS      2.9    16.0    +      -       -      +
    109B  THR*     1.3    67.9    -      -       -      +
    111B  SER*     1.3    68.6    +      -       -      +
    113B  ASN*     3.0    12.1    +      -       -      +
    114B  GLU*     2.8    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 111 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109B  THR*     3.3     4.0    +      -       -      -
    110B  ASN*     1.3    79.2    -      -       -      +
    112B  ILE*     1.3    74.2    +      -       -      +
    114B  GLU*     3.7     5.4    +      -       -      +
    115B  LYS*     3.3    43.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 112 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47B  GLU*     4.2    20.2    -      -       +      +
     51B  LEU*     3.8    23.6    -      -       +      -
    102B  PHE*     3.2    34.5    -      -       +      -
    103B  TYR*     6.1     0.9    -      -       -      -
    106B  TYR*     4.1    14.6    -      -       +      +
    109B  THR*     3.5    30.7    -      -       +      +
    110B  ASN      3.1     0.2    -      -       -      -
    111B  SER*     1.3    83.7    -      -       -      +
    113B  ASN*     1.3    68.5    +      -       -      +
    115B  LYS*     3.2     7.1    +      -       -      +
    116B  MET*     2.7    35.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 113 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  TYR*     3.5    27.0    +      -       -      -
    106B  TYR      4.8     1.5    +      -       -      -
    107B  TYR*     3.5    32.2    +      -       -      +
    109B  THR      3.0     9.6    +      -       -      +
    110B  ASN*     3.0    18.7    +      -       -      +
    112B  ILE*     1.3    79.4    -      -       -      +
    114B  GLU*     1.3    72.0    +      -       -      +
    116B  MET*     3.2     4.8    +      -       -      +
    117B  ASN*     2.9    40.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 114 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110B  ASN*     2.8    42.7    +      -       +      +
    111B  SER*     3.8     5.8    -      -       -      +
    113B  ASN*     1.3    83.1    +      -       -      +
    115B  LYS*     1.3    66.5    +      -       +      +
    117B  ASN*     3.0     5.8    +      -       -      +
    118B  LYS*     2.8    38.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  ASN*     6.1     1.2    -      -       -      +
     51B  LEU*     3.6    39.2    -      -       +      +
     55B  ASN*     5.8     2.2    +      -       -      -
    111B  SER*     3.3    32.3    +      -       -      +
    112B  ILE*     3.2     6.9    +      -       -      +
    114B  GLU*     1.3    80.1    -      -       +      +
    116B  MET*     1.3    63.9    +      -       -      +
    118B  LYS*     3.5     7.3    +      -       -      +
    119B  LEU*     3.1    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     4.4     5.4    -      -       +      +
     54B  LEU*     3.7    28.9    -      -       +      -
     92B  TYR*     5.0     2.7    -      -       -      +
     99B  ILE*     3.8    25.4    -      -       +      -
    102B  PHE*     3.6    29.2    -      -       -      -
    103B  TYR*     3.9    28.0    -      -       +      -
    112B  ILE*     2.7    38.5    +      -       +      +
    113B  ASN*     3.5     4.3    -      -       -      +
    115B  LYS*     1.3    72.8    -      -       -      +
    117B  ASN*     1.3    63.6    +      -       -      +
    119B  LEU*     3.4    13.2    -      -       +      +
    120B  GLU*     3.2    27.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  TYR*     3.5    26.8    +      -       -      -
    113B  ASN*     2.9    42.9    +      -       -      +
    114B  GLU*     3.6     5.5    +      -       -      +
    116B  MET*     1.3    67.8    -      -       -      +
    118B  LYS*     1.3    57.6    +      -       +      +
    119B  LEU      3.0     1.8    -      -       -      -
    120B  GLU*     2.8    18.5    +      -       -      +
    121B  ASN*     2.7    47.0    +      -       -      +
    165D  GLU*     5.3    10.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  GLU*     2.8    32.3    +      -       +      +
    115B  LYS*     3.6     7.9    -      -       -      +
    117B  ASN*     1.3    72.4    -      -       +      +
    119B  LEU*     1.3    63.3    +      -       +      +
    121B  ASN*     3.3    14.0    +      -       +      +
    122B  LYS*     3.2    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 119 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     5.4     3.4    -      -       +      +
     54B  LEU*     3.8    34.8    -      -       +      -
     55B  ASN*     4.3    20.6    -      -       -      +
     58B  GLU*     3.7    31.2    -      -       +      -
     92B  TYR*     4.1    20.2    -      -       +      +
    115B  LYS*     3.1    17.7    +      -       +      +
    116B  MET*     3.4    17.7    -      -       +      +
    117B  ASN      3.0     0.4    -      -       -      -
    118B  LYS*     1.3    79.4    -      -       +      +
    120B  GLU*     1.3    61.9    +      -       -      +
    122B  LYS*     3.4    24.0    +      -       +      +
    123B  TYR*     3.4    13.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92B  TYR*     4.1    13.2    -      -       -      +
     96B  GLN*     4.7     9.7    -      -       -      +
     99B  ILE*     4.8     9.4    -      -       -      +
    100B  ILE*     6.0     1.9    -      -       -      +
    103B  TYR*     4.7    15.0    -      -       -      +
    116B  MET*     3.2    15.4    +      -       +      +
    117B  ASN*     2.8    24.8    +      -       -      +
    119B  LEU*     1.3    74.4    -      -       -      +
    121B  ASN*     1.3    69.3    +      -       -      +
    123B  TYR*     2.8    23.0    +      -       -      +
    124B  ILE*     3.1    17.8    +      -       +      +
    162D  PHE*     4.8    17.8    -      -       -      +
    165D  GLU*     5.1     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  ASN*     2.7    33.1    +      -       -      +
    118B  LYS*     3.3    15.6    +      -       +      +
    120B  GLU*     1.3    74.6    -      -       -      +
    122B  LYS*     1.3    63.8    +      -       -      +
    124B  ILE*     2.9    22.6    +      -       -      +
    125B  ASP*     2.8    35.5    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     58B  GLU*     3.5    45.5    -      -       +      +
     62B  GLN*     4.0    13.1    +      -       -      +
    118B  LYS      3.2    17.4    +      -       -      +
    119B  LEU*     3.4    16.6    -      -       +      +
    120B  GLU      3.1     0.4    -      -       -      -
    121B  ASN*     1.3    74.8    -      -       -      +
    123B  TYR*     1.3    62.5    +      -       -      +
    125B  ASP*     3.4    11.5    +      -       -      +
    126B  ALA*     3.2    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  GLU*     3.6    18.0    -      -       +      -
     61B  TRP*     3.3    43.3    -      +       -      +
     82B  TYR*     3.3    21.7    +      -       -      +
     92B  TYR*     2.9    60.9    -      +       -      +
     93B  TYR*     3.7    29.4    -      +       -      +
    119B  LEU      3.4    15.7    -      -       -      -
    120B  GLU*     2.8    10.3    +      -       -      +
    122B  LYS*     1.3    76.3    -      -       -      +
    124B  ILE*     1.3    67.6    +      -       +      +
    126B  ALA*     3.3    12.5    +      -       -      +
    127B  TYR*     3.4    20.0    -      -       +      -
    153B  ALA*     5.1     3.4    -      -       +      -
    157B  ASN*     6.0     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120B  GLU*     3.1    14.4    +      -       +      +
    121B  ASN*     2.9    27.0    +      -       -      +
    123B  TYR*     1.3    77.4    -      -       +      +
    125B  ASP*     1.3    65.0    +      -       -      +
    127B  TYR*     3.1     7.8    +      -       -      +
    128B  HIS*     3.0    18.6    +      -       +      +
    146B  ASN*     5.1     0.9    -      -       -      +
    149B  SER*     3.9    20.0    -      -       -      -
    150B  LYS*     4.0    31.4    -      -       +      +
    153B  ALA*     4.0    22.7    -      -       +      -
    154B  ASN*     5.4     7.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121B  ASN*     2.8    32.3    +      -       -      +
    122B  LYS*     3.7     9.7    +      -       -      +
    124B  ILE*     1.3    76.8    -      -       -      +
    126B  ALA*     1.3    67.4    +      -       -      +
    128B  HIS*     2.8    15.0    +      -       +      +
    129B  VAL*     2.7    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  GLN*     5.5     4.7    -      -       -      +
     65B  TRP*     4.8     9.2    +      -       +      +
     82B  TYR*     3.3    39.9    -      -       +      +
    122B  LYS      3.2     9.8    +      -       -      +
    123B  TYR*     3.4     4.0    -      -       -      +
    124B  ILE      3.2     0.2    -      -       -      -
    125B  ASP*     1.3    78.4    -      -       -      +
    127B  TYR*     1.3    61.7    +      -       -      +
    129B  VAL*     3.3     9.3    +      -       -      +
    130B  ILE*     3.1    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  PHE*     3.6    31.9    -      +       -      -
     82B  TYR*     3.3    35.6    -      +       +      -
     83B  ASN*     2.6    29.4    +      -       -      -
     93B  TYR*     4.4     5.5    +      -       -      -
    123B  TYR*     3.4    20.6    +      -       +      -
    124B  ILE      3.1     7.3    +      -       -      +
    125B  ASP      3.0     0.2    -      -       -      -
    126B  ALA*     1.3    75.1    -      -       -      +
    128B  HIS*     1.3    68.6    +      -       -      +
    129B  VAL      3.1     0.2    -      -       -      -
    130B  ILE*     3.0     9.2    +      -       +      +
    131B  PHE*     2.8    34.9    +      +       +      -
    149B  SER*     3.7    13.2    -      -       -      +
    152B  ALA*     4.0    17.0    -      -       +      -
    153B  ALA*     3.7    28.5    -      -       +      -
    156B  VAL*     3.5    15.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  ILE*     3.0     9.3    +      -       +      +
    125B  ASP*     3.2    18.9    +      -       -      +
    127B  TYR*     1.3    80.3    -      -       -      +
    129B  VAL*     1.3    59.5    +      -       +      +
    131B  PHE*     3.4     2.3    +      -       -      +
    132B  LYS*     2.8    49.2    +      -       +      +
    145B  VAL*     3.1    29.1    -      -       +      +
    146B  ASN*     3.8    29.8    +      -       -      -
    149B  SER*     3.0    17.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69B  GLN*     6.3     0.9    -      -       -      +
    125B  ASP*     2.7    19.5    +      -       +      +
    126B  ALA*     3.4    11.9    -      -       -      +
    127B  TYR      3.1     0.2    -      -       -      -
    128B  HIS*     1.3    79.1    -      -       +      +
    130B  ILE*     1.3    69.3    +      -       +      +
    131B  PHE      3.1     0.2    +      -       -      -
    132B  LYS*     4.6     4.9    -      -       -      -
    133B  GLU*     2.8    49.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  TRP*     4.0    28.3    -      -       +      +
     75B  ASN*     3.6    36.8    -      -       +      +
     78B  LYS*     4.3    15.9    -      -       +      +
     79B  PHE*     4.2    16.8    -      -       +      +
     82B  TYR*     4.2    20.4    -      -       +      -
    126B  ALA      3.1    15.2    +      -       -      +
    127B  TYR*     3.0    18.7    +      -       +      +
    129B  VAL*     1.3    78.3    -      -       +      +
    131B  PHE*     1.3    60.5    +      -       +      +
    133B  GLU*     4.5     0.2    -      -       -      -
    134B  GLY      2.9    23.6    +      -       -      -
    140B  TRP*     3.4    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79B  PHE*     3.6    33.2    -      +       -      -
    127B  TYR*     2.8    34.4    +      +       +      +
    128B  HIS      3.8     2.9    -      -       -      +
    130B  ILE*     1.3    71.6    -      -       +      +
    132B  LYS*     1.3    61.1    +      -       -      +
    134B  GLY      3.2     0.2    +      -       -      -
    135B  ASN*     2.8    29.6    +      -       -      +
    140B  TRP*     3.0    25.6    +      +       -      -
    142B  ILE*     3.5    23.1    -      -       +      -
    145B  VAL*     4.2    13.0    -      -       +      -
    148B  VAL*     3.9    24.2    -      -       +      -
    149B  SER*     3.7    15.5    -      -       -      -
    152B  ALA*     3.9    18.8    -      -       +      -
    182B  PHE*     4.3     3.1    -      +       -      -
    183B  LEU*     4.9     2.5    -      -       +      -
    186B  LEU*     3.9    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  HIS*     2.8    44.1    +      -       +      +
    129B  VAL*     3.8     4.7    -      -       -      +
    131B  PHE*     1.3    68.8    -      -       -      +
    133B  GLU*     1.3    73.9    +      -       +      +
    135B  ASN*     3.0    21.7    +      -       +      +
    136B  LEU*     3.1    14.9    +      -       +      +
    145B  VAL*     4.8     5.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  ASN*     3.1    23.8    -      -       -      +
     78B  LYS*     5.2     6.9    +      -       -      -
    129B  VAL*     2.8    48.6    +      -       +      +
    130B  ILE      4.5     0.2    -      -       -      +
    132B  LYS*     1.3    77.1    -      -       +      +
    134B  GLY*     1.3    64.8    +      -       -      +
    135B  ASN      3.0     0.5    +      -       -      -
    136B  LEU*     3.1     9.7    +      -       -      +
    137B  ASN*     2.9    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 134 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75B  ASN*     3.5    17.2    -      -       -      +
    130B  ILE      2.9    11.1    +      -       -      -
    131B  PHE      3.5     3.6    -      -       -      -
    133B  GLU*     1.3    76.3    -      -       -      +
    135B  ASN*     1.3    58.8    +      -       -      +
    137B  ASN      3.4     0.3    +      -       -      -
    138B  GLY      3.1     2.4    +      -       -      -
    139B  GLU*     2.8    33.9    +      -       -      +
    140B  TRP*     3.4    26.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131B  PHE      2.8    12.3    +      -       -      +
    132B  LYS*     3.1    14.4    -      -       +      +
    133B  GLU      3.0     0.4    -      -       -      -
    134B  GLY*     1.3    72.4    -      -       -      +
    136B  LEU*     1.3    56.0    +      -       -      +
    137B  ASN      2.9     3.4    -      -       -      -
    138B  GLY*     2.7    27.5    +      -       -      -
    140B  TRP*     3.2    20.3    -      -       -      +
    141B  SER*     3.5     1.4    -      -       -      -
    142B  ILE*     3.0    45.4    +      -       -      +
    145B  VAL*     3.6    19.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132B  LYS*     3.1     8.8    +      -       +      +
    133B  GLU*     3.8     9.0    -      -       -      +
    135B  ASN*     1.3    78.3    -      -       -      +
    137B  ASN*     1.3    63.8    +      -       +      +
    138B  GLY      3.2     1.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 137 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  THR*     5.7     3.2    -      -       -      +
     75B  ASN*     4.1    10.2    -      -       -      +
    133B  GLU      2.9    15.2    +      -       -      +
    134B  GLY      3.9     4.0    -      -       -      +
    135B  ASN      2.9     0.8    +      -       -      -
    136B  LEU*     1.3    83.3    -      -       +      +
    138B  GLY*     1.3    63.1    +      -       -      +
    139B  GLU*     3.3    26.1    +      -       +      +
----------------------------------------------------------
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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