Contacts of the helix formed by residues 49 - 75 (chain A) in PDB entry 2G33


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 49 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  HIS      2.2    22.8    +      -       -      +
     48A  ALA*     1.3    72.5    -      -       -      +
     50A  PRO*     1.3    77.2    -      -       -      +
     51A  HIS*     3.0    23.8    +      -       -      +
     52A  HIS*     2.7    41.9    +      -       -      +
     53A  THR*     3.3     5.8    +      -       -      -
    108A  LEU*     5.4     0.2    -      -       -      +
    112A  ARG*     6.2     0.2    -      -       -      -
     50B  PRO*     6.2     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 50 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  PHE*     4.0    12.8    -      -       +      -
     49A  SER*     1.3    85.3    -      -       -      +
     51A  HIS*     1.3    67.3    +      -       +      +
     53A  THR*     3.0    12.9    +      -       -      +
     54A  ALA*     2.7    23.2    +      -       -      +
    112A  ARG*     5.0     8.5    -      -       -      +
     47B  HIS*     3.4    37.9    -      -       +      +
     50B  PRO*     5.4    11.7    -      -       +      -
     53B  THR*     4.1    17.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 51 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  PHE*     3.3    30.7    -      +       +      -
     49A  SER*     3.0    14.2    +      -       -      +
     50A  PRO*     1.3    79.4    -      -       -      +
     52A  HIS*     1.3    67.3    +      -       -      +
     54A  ALA*     3.1    16.5    +      -       -      +
     55A  LEU*     3.2    12.6    -      -       -      +
    103A  PHE*     4.6     7.4    -      +       -      -
    104A  HIS*     3.0    27.6    +      +       -      +
    107A  ALA*     4.2    19.6    -      -       +      +
    108A  LEU*     3.5    26.4    -      -       +      +
    112A  ARG*     3.6    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 52 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  TYR*     6.5     0.4    -      +       +      -
     41A  ALA*     5.0     5.4    -      -       +      -
     42A  LEU*     4.0    21.8    -      -       +      +
     47A  HIS      4.9     0.2    -      -       -      -
     48A  ALA*     3.8    20.0    -      -       +      +
     49A  SER*     2.7    52.4    +      -       -      +
     50A  PRO      3.1     0.2    -      -       -      -
     51A  HIS*     1.3    80.3    -      -       -      +
     53A  THR*     1.3    66.5    +      -       -      +
     55A  LEU*     2.9    18.0    +      -       -      +
     56A  ARG*     3.2    31.7    -      -       -      +
    108A  LEU*     3.9    29.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 53 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  HIS*     3.7     5.2    -      -       -      +
     49A  SER      3.3    12.1    +      -       -      -
     50A  PRO*     3.1    12.5    -      -       -      +
     52A  HIS*     1.3    75.2    -      -       -      +
     54A  ALA*     1.3    66.4    +      -       -      +
     56A  ARG*     2.8    28.2    -      -       -      +
     57A  GLN*     3.0    14.8    +      -       -      +
      8B  GLU*     2.6    35.1    +      -       -      +
     50B  PRO*     4.0    13.3    -      -       +      +
     53B  THR*     4.8     1.8    -      -       -      -
     54B  ALA*     3.7    32.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 54 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  PHE*     4.5     7.4    -      -       +      -
     50A  PRO      2.7    14.3    +      -       -      +
     51A  HIS*     3.1    11.7    -      -       -      +
     53A  THR*     1.3    74.3    -      -       -      +
     55A  LEU*     1.3    67.8    +      -       -      +
     57A  GLN*     3.3    14.3    -      -       -      +
     58A  ALA*     3.8     4.9    +      -       -      +
    100A  LEU*     5.8     0.5    -      -       -      +
    104A  HIS*     3.1    34.8    -      -       +      +
     53B  THR*     4.8     5.1    -      -       +      +
     57B  GLN*     4.0    23.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 55 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  ALA*     5.5     7.2    -      -       +      -
     38A  TYR*     6.0     4.5    -      -       +      -
     42A  LEU*     5.3    13.9    -      -       +      -
     51A  HIS      3.2    16.8    -      -       -      +
     52A  HIS*     2.9    11.1    +      -       -      +
     54A  ALA*     1.3    76.5    -      -       -      +
     56A  ARG*     1.3    70.9    +      -       +      +
     57A  GLN      2.5     4.2    +      -       -      -
     58A  ALA*     2.6    27.5    +      -       +      +
     59A  ILE*     3.0    21.3    -      -       +      +
    100A  LEU*     6.1     0.4    -      -       +      -
    101A  LEU*     5.6     7.2    -      -       +      +
    104A  HIS*     3.3    36.8    -      -       +      -
    105A  ILE*     4.1    25.6    -      -       +      +
    108A  LEU*     5.0    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 56 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  ALA      4.3     1.2    +      -       -      -
     42A  LEU*     2.7    60.3    +      -       -      +
     44A  SER      4.0     6.7    +      -       -      -
     46A  GLU      3.5    22.6    +      -       -      -
     47A  HIS*     3.7    13.3    -      -       -      +
     52A  HIS*     3.2    25.1    +      -       -      +
     53A  THR*     2.8    28.8    -      -       -      +
     55A  LEU*     1.3    76.9    -      -       -      +
     57A  GLN*     1.3    78.3    +      -       -      +
     59A  ILE*     3.1    12.3    +      -       -      +
     60A  LEU*     2.8    25.5    +      -       -      +
      3B  ILE*     4.9    16.6    -      -       +      -
      4B  ASP      5.8     3.8    -      -       -      -
      5B  PRO*     5.3     9.6    -      -       +      -
      8B  GLU*     3.9    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 57 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  THR*     3.0    23.5    +      -       -      +
     54A  ALA      3.3    13.7    -      -       -      +
     55A  LEU      2.5     3.2    +      -       -      -
     56A  ARG*     1.3    76.6    -      -       -      +
     58A  ALA*     1.3    69.3    +      -       -      +
     60A  LEU*     2.5    22.4    +      -       -      -
     61A  ALA*     2.6    16.7    +      -       +      -
      5B  PRO*     5.3    12.7    +      -       -      +
      8B  GLU*     5.1     2.4    +      -       -      -
      9B  PHE*     6.4     0.2    -      -       -      -
     54B  ALA*     4.1    20.4    -      -       -      +
     57B  GLN*     3.4    34.1    -      -       +      -
     58B  ALA*     4.7     7.5    +      -       -      +
    100B  LEU*     4.9    13.2    -      -       -      +
    104B  HIS*     5.3     4.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 58 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ALA      3.8     4.7    +      -       -      +
     55A  LEU*     2.6    20.7    +      -       -      +
     57A  GLN*     1.3    76.2    -      -       -      +
     59A  ILE*     1.3    54.6    +      -       +      +
     61A  ALA*     3.1     3.0    +      -       -      +
     62A  TRP*     2.8    37.8    +      -       -      +
     97A  PHE*     3.4    17.6    -      -       +      -
    100A  LEU*     4.5    18.2    -      -       +      -
    101A  LEU*     4.3    18.4    -      -       +      -
     57B  GLN*     5.1     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 59 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  LEU*     4.7    20.4    -      -       +      -
     42A  LEU*     5.9     4.7    -      -       +      -
     55A  LEU*     3.0    53.4    -      -       +      -
     56A  ARG*     3.1    10.1    -      -       -      +
     57A  GLN      2.9     2.6    +      -       -      -
     58A  ALA*     1.3    74.0    -      -       +      +
     60A  LEU*     1.3    56.2    +      -       +      +
     62A  TRP*     3.2     9.5    +      -       +      +
     63A  GLY*     2.6    35.7    +      -       -      -
    101A  LEU*     4.8    12.8    -      -       +      +
      1B  MET*     4.8    22.0    -      -       +      +
      3B  ILE*     5.7     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  ARG      2.8    15.4    +      -       -      +
     57A  GLN*     2.5    15.0    +      -       -      +
     59A  ILE*     1.3    72.6    -      -       +      +
     61A  ALA*     1.3    59.3    +      -       -      +
     63A  GLY*     3.2     4.6    +      -       -      +
     64A  ASP*     2.8    39.5    +      -       -      +
      1B  MET      5.2     5.4    -      -       -      +
      3B  ILE*     3.8    32.3    -      -       +      +
      5B  PRO*     3.2    48.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  GLN*     2.6    19.1    +      -       +      +
     58A  ALA*     3.5     8.1    -      -       -      +
     60A  LEU*     1.3    72.0    -      -       -      +
     62A  TRP*     1.3    57.1    +      -       -      +
     64A  ASP*     2.8    27.4    -      -       -      +
     65A  LEU*     2.9    19.9    +      -       +      +
     97A  PHE*     4.2    15.5    -      -       +      -
     61B  ALA*     4.2    18.4    -      -       +      -
     97B  PHE*     4.9    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  VAL*     4.1    32.8    -      -       +      -
     31A  LEU*     4.2    21.8    -      -       +      +
     58A  ALA      2.8    16.5    +      -       -      +
     59A  ILE*     3.5     8.3    -      -       +      +
     61A  ALA*     1.3    73.8    -      -       -      +
     63A  GLY*     1.3    55.9    +      -       -      +
     64A  ASP      2.8     5.2    -      -       -      -
     65A  LEU*     2.8    20.4    +      -       +      +
     66A  MET*     2.7    72.0    +      -       +      -
     89A  VAL*     4.7    17.7    -      -       +      -
     90A  ASN*     5.0    11.0    -      -       -      -
     93A  VAL*     4.0    19.3    -      -       +      -
     94A  GLY*     4.6    10.1    -      -       -      -
     97A  PHE*     3.4    36.1    -      +       +      -
    101A  LEU*     5.8     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  ILE*     2.6    21.0    +      -       -      -
     60A  LEU*     3.2     8.3    +      -       -      -
     62A  TRP*     1.3    77.8    -      -       -      +
     64A  ASP*     1.3    55.1    +      -       -      +
     66A  MET*     4.4     5.4    -      -       -      -
     67A  THR*     2.7    30.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  LEU*     2.8    16.8    +      -       -      +
     61A  ALA*     2.8    21.4    -      -       -      +
     62A  TRP      2.8     0.2    -      -       -      -
     63A  GLY*     1.3    78.2    -      -       -      +
     65A  LEU*     1.3    62.7    +      -       +      +
     67A  THR*     3.7     8.5    -      -       -      +
     68A  LEU*     3.1    23.4    +      -       -      +
     88B  TYR*     5.0     2.1    +      -       -      -
     93B  VAL*     6.0     5.3    -      -       +      +
     96B  LYS*     3.5    38.2    +      -       -      +
     97B  PHE*     4.4    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  ALA*     2.9    23.8    +      -       +      +
     62A  TRP*     2.8    25.7    +      -       +      +
     64A  ASP*     1.3    79.2    -      -       +      +
     66A  MET*     1.3    55.2    +      -       +      +
     67A  THR      3.0     1.3    -      -       -      -
     68A  LEU*     2.7    21.0    +      -       +      +
     69A  ALA*     2.6    36.5    +      -       -      +
     89A  VAL*     5.3    11.9    -      -       +      -
     93A  VAL*     4.2    26.7    -      -       +      -
     97A  PHE*     4.7     8.3    -      -       +      -
     65B  LEU*     5.1    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28A  ARG*     5.2    15.5    -      -       -      +
     31A  LEU*     6.0     0.4    -      -       -      -
     62A  TRP*     2.7    54.6    +      -       +      +
     63A  GLY*     4.8     4.7    -      -       -      -
     65A  LEU*     1.3    74.1    -      -       +      +
     67A  THR*     1.3    59.9    +      -       -      +
     68A  LEU      3.4     0.2    +      -       -      -
     69A  ALA*     3.9    11.9    -      -       +      -
     70A  THR*     3.2    35.4    +      -       +      +
     89A  VAL*     6.4     1.8    -      -       +      -
     90A  ASN*     5.6    12.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 67 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  GLY      2.7    25.2    +      -       -      -
     64A  ASP*     3.7     9.5    +      -       -      +
     65A  LEU      3.0     0.6    -      -       -      -
     66A  MET*     1.3    78.4    -      -       -      +
     68A  LEU*     1.3    62.8    +      -       -      +
     70A  THR*     3.9     7.6    +      -       -      -
     71A  TRP*     3.8    11.1    +      -       -      +
     88B  TYR*     4.5     7.7    +      -       -      +
     96B  LYS*     4.0    23.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  ASP      3.1    15.1    +      -       -      +
     65A  LEU*     2.7    25.8    +      -       +      +
     67A  THR*     1.3    78.5    -      -       -      +
     69A  ALA*     1.3    57.6    +      -       +      +
     71A  TRP*     2.5    39.4    +      -       +      +
     72A  VAL*     3.0    27.1    +      -       +      +
     89A  VAL*     6.3     2.9    -      -       +      -
     88B  TYR*     3.4    42.0    -      -       +      -
     89B  VAL*     6.2     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  LEU      2.6    17.7    +      -       -      +
     66A  MET*     3.9    15.9    -      -       +      +
     68A  LEU*     1.3    79.6    -      -       +      +
     70A  THR*     1.3    64.5    +      -       +      +
     71A  TRP      3.2     0.5    +      -       -      -
     72A  VAL*     3.3    20.5    +      -       -      +
     73A  GLY*     3.6     4.5    +      -       -      -
     85A  VAL*     6.5     0.2    -      -       -      -
     86A  VAL*     5.3    23.6    -      -       +      +
     89A  VAL*     6.0     5.8    -      -       +      -
     90A  ASN*     5.9     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  MET*     3.2    25.4    +      -       +      +
     67A  THR*     3.9     7.4    +      -       -      -
     69A  ALA*     1.3    82.2    -      -       +      +
     71A  TRP*     1.3    61.3    +      -       -      +
     73A  GLY*     3.8     3.1    +      -       -      -
     74A  THR*     3.4    19.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  THR      3.8    11.4    -      -       -      +
     68A  LEU*     2.5    29.2    +      -       +      +
     70A  THR*     1.3    71.6    +      -       -      +
     72A  VAL*     1.3    90.4    +      -       +      -
     73A  GLY      3.1     2.0    -      -       -      -
     74A  THR*     2.8    29.3    +      -       +      -
     75A  ASN*     2.9    53.9    +      -       +      +
     76A  LEU*     6.2     2.0    -      -       +      -
     84B  LEU*     5.0    16.8    -      -       +      -
     85B  VAL*     5.6     8.1    -      -       +      -
     88B  TYR*     3.9    51.7    -      +       +      +
     92B  ASN*     5.9     1.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  LEU*     3.0    39.2    +      -       +      +
     69A  ALA*     3.4    11.7    -      -       -      +
     71A  TRP*     1.3    91.7    -      -       +      +
     73A  GLY*     1.3    61.1    +      -       -      +
     75A  ASN      3.4     0.5    +      -       -      -
     76A  LEU*     3.2    53.1    +      -       +      +
     82A  ARG*     4.2    12.1    -      -       +      +
     85A  VAL*     4.7    22.9    -      -       +      -
     86A  VAL*     6.2     0.9    -      -       +      -
     85B  VAL*     6.1     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  ALA      3.6     7.0    +      -       -      -
     70A  THR*     3.8     4.8    +      -       -      -
     71A  TRP      3.1     1.0    -      -       -      -
     72A  VAL*     1.3    78.9    -      -       -      +
     74A  THR*     1.3    60.4    +      -       -      +
     76A  LEU      4.2     2.8    +      -       -      +
     77A  GLU*     5.5     0.9    -      -       -      +
     82A  ARG*     3.3    35.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  THR      3.4    14.0    +      -       -      -
     71A  TRP*     2.8    14.3    +      -       +      -
     73A  GLY*     1.3    79.2    -      -       -      +
     75A  ASN*     1.3    69.9    +      -       -      +
     76A  LEU      3.7     2.6    +      -       -      -
     77A  GLU*     4.2    10.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  TRP*     2.9    55.4    +      -       +      +
     72A  VAL      3.5     2.2    -      -       -      +
     74A  THR*     1.3    93.7    -      -       -      +
     76A  LEU*     1.3    66.8    +      -       -      +
     77A  GLU*     4.4     0.9    -      -       -      -
     84B  LEU*     4.1    14.2    -      -       +      +
----------------------------------------------------------
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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