Contacts of the helix formed by residues 114 - 137 (chain B) in PDB entry 3NO1


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 ASP 114 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73B  THR*     6.2     0.6    -      -       +      +
    113B  ARG*     1.3    76.4    -      -       -      +
    115B  ARG*     1.3    68.6    +      -       -      +
    116B  ARG*     3.0    31.8    +      -       -      +
    117B  LEU*     3.1    34.2    +      -       +      +
    118B  GLY      4.2     0.5    +      -       -      -
    271B  PHE*     5.0     3.6    -      -       -      -
    113D  ARG      4.8     0.2    -      -       -      -
    114D  ASP*     3.3    49.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 115 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108B  THR*     2.7    44.8    +      -       -      +
    109B  PHE*     4.3     9.5    +      -       -      +
    110B  ASP      4.4     8.3    +      -       -      +
    111B  ILE*     5.0     3.0    -      -       -      +
    113B  ARG*     3.0     8.7    +      -       -      +
    114B  ASP*     1.3    74.2    +      -       -      +
    116B  ARG*     1.3    61.1    +      -       -      +
    117B  LEU      3.1     0.9    +      -       -      -
    118B  GLY*     3.2     4.8    +      -       -      +
    119B  LEU*     3.1    27.4    +      -       +      +
    271B  PHE*     5.0    14.8    -      -       +      -
    218D  GLN*     3.3    22.4    +      -       -      +
    246D  TRP*     3.4    64.8    -      -       -      +
    269D  THR*     4.1    19.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 116 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70B  GLU*     5.4     3.8    -      -       -      +
    114B  ASP*     3.0    21.3    +      -       -      +
    115B  ARG*     1.3    76.7    -      -       -      +
    117B  LEU*     1.3    61.0    +      -       +      +
    119B  LEU*     4.2     4.0    -      -       -      +
    120B  VAL*     2.9    38.1    +      -       +      +
    268B  GLN      3.4     9.3    +      -       -      -
    269B  THR*     3.1    26.1    +      -       -      +
    270B  GLU      3.0    26.9    +      -       -      -
    271B  PHE*     3.1    33.9    -      -       +      +
    294B  TRP*     2.9    64.2    +      -       +      +
    295B  SER*     3.3     9.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 117 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70B  GLU*     5.6     1.6    -      -       -      +
     73B  THR*     3.4    40.8    -      -       +      +
     76B  ASP*     4.6    17.0    -      -       +      +
     77B  ILE*     3.9    20.8    -      -       +      +
     80B  ILE*     4.9    10.8    -      -       +      +
    113B  ARG*     4.2    28.5    -      -       +      +
    114B  ASP*     3.1    29.1    +      -       +      +
    116B  ARG*     1.3    80.0    -      -       +      +
    118B  GLY*     1.3    62.3    +      -       -      +
    120B  VAL*     3.8     2.3    -      -       -      +
    121B  ALA*     3.1    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 118 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  ILE*     4.8     1.3    -      -       -      -
    107B  VAL*     3.7    35.8    +      -       -      +
    108B  THR*     4.3     2.2    -      -       -      -
    113B  ARG*     4.7     7.4    -      -       -      +
    114B  ASP      4.2     0.8    +      -       -      -
    115B  ARG*     3.2     6.8    +      -       -      +
    117B  LEU*     1.3    80.9    -      -       -      +
    119B  LEU*     1.3    55.8    +      -       -      +
    121B  ALA*     3.2     5.9    +      -       -      +
    122B  LEU*     2.8    31.5    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    101B  TRP*     6.1     0.7    -      -       +      -
    105B  TYR*     5.1     5.4    -      -       +      -
    108B  THR*     3.7    22.2    -      -       +      +
    115B  ARG*     3.1    23.0    +      -       +      +
    116B  ARG*     3.9     3.6    -      -       -      +
    118B  GLY*     1.3    75.2    -      -       -      +
    120B  VAL*     1.3    58.0    +      -       -      +
    122B  LEU*     3.5     4.0    +      -       +      -
    123B  ALA*     3.0    23.9    +      -       -      +
    271B  PHE*     3.6    53.6    -      -       +      +
    294B  TRP      3.3    21.3    -      -       -      +
    295B  SER*     3.7    15.7    -      -       -      +
    296B  GLY*     3.1    16.4    +      -       -      +
    246D  TRP*     4.3    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 120 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  ILE*     6.1     0.9    -      -       +      -
     67B  THR*     4.6    10.1    -      -       +      +
     68B  GLY*     5.2     4.3    -      -       -      -
     70B  GLU*     3.9    25.4    -      -       +      +
     77B  ILE*     3.6    29.4    -      -       +      -
    116B  ARG*     2.9    27.6    +      -       +      +
    117B  LEU      3.8     2.7    -      -       -      +
    119B  LEU*     1.3    76.7    -      -       -      +
    121B  ALA*     1.3    58.7    +      -       -      +
    123B  ALA*     3.3     2.8    +      -       -      +
    124B  ALA*     3.0    27.1    +      -       +      +
    293B  SER      3.8    20.9    -      -       -      +
    294B  TRP*     4.0    21.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 121 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  ILE*     4.0    12.1    -      -       +      +
     80B  ILE*     3.7    32.5    -      -       +      -
     81B  ILE*     3.8    12.1    -      -       +      +
     85B  LEU*     3.2    19.1    -      -       +      +
    117B  LEU      3.1    17.5    +      -       -      +
    118B  GLY      3.6     4.5    -      -       -      +
    120B  VAL*     1.3    78.3    -      -       -      +
    122B  LEU*     1.3    61.9    +      -       -      +
    124B  ALA*     3.3     4.0    +      -       -      +
    125B  VAL*     3.3    17.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 122 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     85B  LEU*     3.7    12.3    -      -       +      +
    100B  LEU      5.6     0.2    -      -       -      +
    101B  TRP*     3.7    53.4    -      -       +      +
    104B  GLY*     4.2    21.8    -      -       -      +
    105B  TYR*     4.1    25.4    -      -       +      +
    107B  VAL*     4.4     5.4    -      -       +      -
    108B  THR*     4.5     9.0    -      -       +      -
    118B  GLY      2.8    16.1    +      -       -      +
    119B  LEU*     3.8     5.6    -      -       +      +
    121B  ALA*     1.3    75.8    -      -       -      +
    123B  ALA*     1.3    57.2    -      -       -      +
    125B  VAL*     3.5     5.5    +      -       +      +
    126B  ASN*     2.9    32.8    +      -       +      +
    296B  GLY*     3.9     8.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 123 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67B  THR*     4.7     2.7    -      -       -      +
    119B  LEU      3.0    17.7    +      -       -      +
    120B  VAL      3.6     4.9    -      -       -      +
    121B  ALA      3.2     0.2    -      -       -      -
    122B  LEU*     1.3    75.6    -      -       -      +
    124B  ALA*     1.3    62.6    +      -       -      +
    126B  ASN*     3.9     0.2    -      -       -      +
    127B  THR*     2.7    34.0    +      -       -      +
    292B  SER      3.5    12.8    -      -       -      +
    293B  SER*     3.6    16.8    -      -       -      +
    296B  GLY      3.5     0.9    -      -       -      +
    297B  GLY*     3.3    29.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 124 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  ILE*     5.9     2.5    -      -       +      -
     53B  THR*     3.6    22.4    -      -       -      +
     65B  ALA*     5.5     1.2    -      -       -      +
     67B  THR*     3.4    30.5    -      -       +      +
     77B  ILE*     5.8     0.7    -      -       +      -
     81B  ILE*     4.0    15.7    -      -       +      -
    120B  VAL*     3.0    11.0    +      -       +      +
    121B  ALA      3.5     9.6    -      -       -      +
    122B  LEU      3.3     0.2    -      -       -      -
    123B  ALA*     1.3    78.2    -      -       -      +
    125B  VAL*     1.3    62.5    +      -       -      +
    127B  THR*     3.9     2.4    -      -       -      -
    128B  ALA*     3.2    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 125 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25B  ILE*     5.0     5.2    -      -       +      -
     53B  THR*     4.6    11.2    -      -       +      -
     55B  VAL*     5.3     1.6    -      -       +      -
     81B  ILE*     3.9    27.8    -      -       +      -
     85B  LEU*     4.0    20.9    -      -       +      -
     89B  LEU*     3.2    40.8    -      -       +      -
    121B  ALA      3.3     6.5    +      -       -      +
    122B  LEU*     3.9     7.6    -      -       +      +
    124B  ALA*     1.3    81.7    -      -       -      +
    126B  ASN*     1.3    60.0    +      -       -      +
    128B  ALA*     3.4     2.3    +      -       -      +
    129B  ILE*     2.8    39.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 126 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  ILE*     3.9    10.0    -      -       -      +
    101B  TRP*     3.5    16.2    +      -       +      +
    122B  LEU*     2.9    20.4    +      -       +      +
    123B  ALA*     3.9     2.2    -      -       -      +
    125B  VAL*     1.3    79.3    -      -       -      +
    127B  THR*     1.3    61.1    +      -       -      +
    129B  ILE*     3.7     7.3    -      -       -      +
    130B  TRP*     3.0    39.1    +      -       -      -
    296B  GLY      3.6    12.0    +      -       -      +
    297B  GLY      3.6     2.6    -      -       -      -
    298B  PRO*     3.1    19.2    -      -       -      +
    299B  THR*     3.1    45.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 127 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  ALA*     3.8    22.2    -      -       +      -
     66B  TYR      5.5     2.5    -      -       -      +
     67B  THR*     4.6    10.4    +      -       -      +
    123B  ALA*     2.7    24.0    +      -       -      +
    124B  ALA*     3.9     4.0    -      -       -      -
    126B  ASN*     1.3    75.3    -      -       -      +
    128B  ALA*     1.3    64.1    +      -       -      +
    130B  TRP*     3.4     4.1    +      -       +      +
    131B  ASP*     3.2    20.6    +      -       -      +
    145B  TRP*     6.0     0.2    -      -       +      -
    292B  SER*     4.8     1.9    +      -       -      -
    293B  SER*     5.3     1.9    +      -       -      -
    297B  GLY*     4.4     1.4    -      -       -      -
    298B  PRO*     3.5    21.0    -      -       +      +
    323B  VAL*     4.0    29.1    -      -       +      +
    371B  LEU*     4.2     9.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 128 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53B  THR*     3.9    25.8    -      -       +      +
     55B  VAL*     3.5    23.1    -      -       +      -
     63B  GLY*     3.3    13.5    -      -       -      +
     64B  GLU*     4.3     9.4    -      -       -      +
     65B  ALA*     4.5     2.2    -      -       -      +
    124B  ALA      3.2    15.3    +      -       -      +
    125B  VAL      3.8     1.3    -      -       -      +
    127B  THR*     1.3    77.3    -      -       -      +
    129B  ILE*     1.3    64.9    +      -       -      +
    131B  ASP*     3.1     7.8    +      -       -      +
    132B  ALA      3.0    17.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 129 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22B  ILE*     4.8     9.2    -      -       +      -
     55B  VAL*     4.0    21.1    -      -       +      -
     89B  LEU*     5.2     0.9    -      -       +      -
     94B  ALA*     3.2    35.2    -      -       +      +
     97B  ILE*     3.4    29.4    -      -       +      -
    100B  LEU*     4.6    11.7    -      -       +      -
    125B  VAL*     2.8    34.7    +      -       +      +
    126B  ASN*     3.7    16.8    -      -       -      +
    128B  ALA*     1.3    76.0    -      -       -      +
    130B  TRP*     1.3    61.1    +      -       -      +
    132B  ALA*     3.1     9.9    +      -       -      +
    133B  VAL*     2.8    28.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 130 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144A  LEU      6.0     1.8    -      -       -      -
     97B  ILE*     3.5    34.9    -      -       +      +
     98B  GLU*     6.2     0.2    -      -       -      -
    126B  ASN*     3.0    37.9    +      -       -      +
    127B  THR*     3.6     7.0    -      -       +      +
    128B  ALA      3.2     0.4    -      -       -      -
    129B  ILE*     1.3    83.8    -      -       +      +
    131B  ASP*     1.3    57.5    +      -       -      +
    133B  VAL*     3.2     5.4    +      -       +      +
    134B  GLY      2.8    24.4    +      -       -      -
    141B  LEU*     3.6    19.4    -      -       +      +
    144B  LEU*     4.0    20.6    -      -       +      -
    145B  TRP*     3.3    51.1    -      +       +      -
    298B  PRO*     3.7    14.4    -      -       +      +
    299B  THR*     3.1    27.1    +      -       -      +
    302B  LEU*     4.6     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 131 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  GLY*     3.5     2.3    -      -       -      -
     64B  GLU*     2.8    39.9    +      -       -      +
    127B  THR      3.2    10.4    +      -       -      +
    128B  ALA      3.1     9.8    +      -       -      +
    130B  TRP*     1.3    76.3    -      -       -      +
    132B  ALA*     1.3    61.8    +      -       -      +
    134B  GLY*     3.2     1.9    +      -       -      -
    135B  LYS*     3.0    55.6    +      -       -      +
    141B  LEU*     4.0     9.6    -      -       -      +
    370B  GLY*     3.6     2.6    -      -       -      -
    371B  LEU*     2.8    38.0    +      -       +      +
    372B  GLY      4.1     1.2    +      -       -      -
    373B  TRP      5.6     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 132 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20B  LEU*     4.1    12.7    -      -       +      +
     55B  VAL*     4.7     3.8    -      -       +      +
     57B  THR*     4.7     7.9    -      -       +      -
     61B  ILE*     3.8    16.2    -      -       +      +
     63B  GLY*     3.6    25.3    -      -       -      +
     94B  ALA*     5.2     2.9    -      -       +      -
    128B  ALA      3.0     7.8    +      -       -      +
    129B  ILE*     3.2    13.7    -      -       +      +
    131B  ASP*     1.3    77.4    -      -       -      +
    133B  VAL*     1.3    56.9    -      -       +      +
    135B  LYS*     3.3     3.4    +      -       -      +
    136B  ALA*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 133 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  MSE      5.2     2.2    -      -       +      -
     20B  LEU*     4.8     0.7    -      -       +      -
     94B  ALA*     3.5    29.2    -      -       +      +
     95B  MSE      3.8    25.1    -      -       +      +
     97B  ILE*     4.0    14.4    -      -       +      -
    129B  ILE*     2.8    30.0    +      -       +      +
    130B  TRP*     3.2     8.5    +      -       +      +
    132B  ALA*     1.3    69.4    -      -       -      +
    134B  GLY*     1.3    65.8    +      -       -      +
    136B  ALA*     3.2     6.4    +      -       -      +
    137B  LEU*     2.9    38.7    +      -       +      +
    144B  LEU*     4.3    10.3    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    130B  TRP      2.8    14.3    +      -       -      -
    131B  ASP      3.7     3.4    -      -       -      -
    133B  VAL*     1.3    79.2    -      -       -      +
    135B  LYS*     1.3    55.6    +      -       -      +
    137B  LEU      3.4     0.3    +      -       -      -
    138B  LYS      3.0     7.1    +      -       -      -
    139B  MSE      2.8    47.3    +      -       -      +
    141B  LEU*     4.2     7.8    -      -       -      +
    144B  LEU*     4.4     6.5    -      -       -      -
    369B  PRO*     3.6     0.5    -      -       -      +
    370B  GLY*     3.5     8.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  ILE*     3.9    20.1    -      -       +      +
     62B  ILE      3.0    24.0    +      -       -      +
     64B  GLU*     4.0    13.7    +      -       -      +
    131B  ASP*     3.0    47.5    +      -       -      +
    132B  ALA      3.6     4.0    -      -       -      +
    133B  VAL      3.2     0.2    -      -       -      -
    134B  GLY*     1.3    74.8    -      -       -      +
    136B  ALA*     1.3    65.3    +      -       -      +
    138B  LYS*     3.1    23.0    +      -       -      +
    369B  PRO*     3.8    27.5    -      -       +      +
    370B  GLY      3.8     0.2    -      -       -      +
    372B  GLY*     5.5     2.9    -      -       -      +
    373B  TRP      5.7     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 136 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20B  LEU*     3.9    18.2    -      -       +      -
     61B  ILE*     3.4    22.8    -      -       +      +
     95B  MSE      4.0    15.7    -      -       +      -
    132B  ALA      2.9    17.2    +      -       -      +
    133B  VAL      3.6     5.2    -      -       -      +
    135B  LYS*     1.3    75.8    -      -       -      +
    137B  LEU*     1.3    61.4    +      -       +      +
    138B  LYS*     3.3    19.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137A  LEU*     3.6    35.6    -      -       +      +
    139A  MSE      3.6    47.3    -      -       +      -
    144A  LEU*     4.4     4.3    -      -       +      -
     95B  MSE      4.8     6.1    -      -       +      -
    133B  VAL*     2.9    32.8    +      -       +      +
    134B  GLY*     4.1     1.6    -      -       -      +
    136B  ALA*     1.3    79.2    -      -       +      +
    138B  LYS*     1.3    73.5    +      -       -      +
    139B  MSE      3.0    20.3    +      -       +      +
    144B  LEU*     4.2    21.5    -      -       +      -
----------------------------------------------------------
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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