Contacts of the helix formed by residues 68 - 97 (chain A) in PDB entry 4U7I


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 GLY 68 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  THR*     1.3    76.1    -      -       -      +
     69A  PRO*     1.3    77.7    -      -       -      +
     70A  GLY      3.2     3.1    -      -       -      -
     71A  TRP      3.1     4.2    +      -       -      -
     72A  GLU*     3.0    37.3    +      -       -      +
     75A  ARG*     5.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLY*     1.3    83.8    -      -       -      +
     70A  GLY*     1.3    56.9    +      -       -      +
     72A  GLU*     3.4    18.4    -      -       -      +
     73A  SER*     2.9    31.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ILE*     3.7    21.1    -      -       -      +
     67A  THR      5.4     0.2    +      -       -      -
     68A  GLY      3.1     1.2    +      -       -      -
     69A  PRO*     1.3    80.3    -      -       -      +
     71A  TRP*     1.3    57.0    +      -       -      +
     73A  SER*     3.3     7.6    +      -       -      -
     74A  ALA*     2.9    26.5    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
     10A  PRO*     3.9    23.4    -      -       +      +
     12A  GLU*     3.5    31.2    -      -       +      -
     13A  ILE*     3.7    27.9    -      -       +      +
     16A  ILE*     4.2    11.0    -      -       +      -
     60A  SER      3.8     9.4    -      -       -      -
     61A  SER*     3.8    31.9    -      -       -      -
     65A  GLU      4.0     5.3    +      -       -      -
     66A  HIS*     3.3    65.2    -      +       +      +
     67A  THR      3.4    15.7    +      -       -      +
     68A  GLY      3.1     7.1    +      -       -      +
     70A  GLY*     1.3    72.4    -      -       -      +
     72A  GLU*     1.3    61.0    +      -       -      +
     74A  ALA*     3.2     6.3    +      -       +      +
     75A  ARG*     2.8    38.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68A  GLY*     3.0    31.7    +      -       -      +
     69A  PRO*     3.4    15.9    -      -       -      +
     71A  TRP*     1.3    76.0    -      -       -      +
     73A  SER*     1.3    63.4    +      -       -      +
     75A  ARG*     3.3    28.6    +      -       -      +
     76A  GLN*     3.1    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69A  PRO      2.9    19.0    +      -       -      -
     70A  GLY*     3.5     7.6    -      -       -      -
     72A  GLU*     1.3    76.4    -      -       -      +
     74A  ALA*     1.3    57.2    +      -       -      +
     76A  GLN*     3.2     9.1    +      -       -      +
     77A  MET*     3.0    44.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ILE*     4.2    15.0    -      -       +      -
     16A  ILE*     3.8    30.4    -      -       +      +
     61A  SER*     5.5     0.2    -      -       -      -
     70A  GLY      2.9    16.3    +      -       -      +
     71A  TRP*     3.2    17.5    +      -       +      +
     73A  SER*     1.3    74.9    -      -       -      +
     75A  ARG*     1.3    66.8    +      -       -      +
     77A  MET*     3.1     9.6    +      -       -      +
     78A  GLN*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  SER*     2.9    43.5    +      -       -      +
     62A  LYS*     4.4    16.0    -      -       -      +
     66A  HIS*     2.9    27.3    +      -       -      +
     67A  THR*     4.9     2.0    -      -       -      +
     68A  GLY      4.7     0.4    +      -       -      +
     71A  TRP*     2.8    22.9    +      -       -      +
     72A  GLU*     3.3    37.5    -      -       -      +
     74A  ALA*     1.3    76.2    -      -       -      +
     76A  GLN*     1.3    60.2    +      -       +      +
     78A  GLN*     3.0    11.7    +      -       -      +
     79A  GLN*     2.9    26.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72A  GLU*     3.1    20.9    +      -       -      +
     73A  SER*     3.7     9.4    -      -       -      +
     74A  ALA      3.2     0.2    -      -       -      -
     75A  ARG*     1.3    77.5    -      -       +      +
     77A  MET*     1.3    62.6    +      -       -      +
     79A  GLN*     3.2    17.6    +      -       -      +
     80A  LYS*     3.1    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ILE*     6.5     0.9    -      -       -      -
     16A  ILE*     4.0    12.6    -      -       +      -
     17A  ARG*     3.9    35.9    -      -       +      +
     20A  TYR*     3.6    57.5    -      -       +      -
     21A  LYS*     6.1     0.7    -      -       -      -
     73A  SER*     3.0    29.0    +      -       -      +
     74A  ALA*     3.4    11.2    -      -       -      +
     76A  GLN*     1.3    77.4    -      -       -      +
     78A  GLN*     1.3    55.7    +      -       -      +
     80A  LYS*     3.2     4.0    +      -       -      +
     81A  MET*     2.9    34.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 78 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  ILE*     3.5    23.2    -      -       +      +
     56A  GLY      2.9    29.7    +      -       -      +
     57A  ILE*     3.6    13.7    +      -       +      +
     59A  ILE      2.8    27.1    +      -       -      -
     61A  SER*     2.5    27.5    +      -       -      -
     74A  ALA      3.0    12.4    +      -       -      +
     75A  ARG*     3.0    13.9    +      -       -      +
     77A  MET*     1.3    73.4    -      -       -      +
     79A  GLN*     1.3    60.9    +      -       -      +
     81A  MET*     3.7     9.3    -      -       +      +
     82A  LYS*     2.9    41.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 79 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75A  ARG      2.9    12.0    +      -       -      +
     76A  GLN*     3.4    19.8    -      -       -      +
     78A  GLN*     1.3    78.2    -      -       -      +
     80A  LYS*     1.3    70.7    +      -       +      +
     82A  LYS*     3.3    15.2    +      -       -      +
     83A  GLU*     3.2    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 80 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  TYR*     4.1    15.0    -      -       +      +
     76A  GLN*     3.1    17.4    +      -       -      +
     77A  MET*     3.2     7.4    +      -       -      +
     79A  GLN*     1.3    85.7    -      -       +      +
     81A  MET*     1.3    62.5    +      -       -      +
     83A  GLU*     3.3    14.2    +      -       -      +
     84A  THR*     3.1    26.3    +      -       -      -
    321B  PHE*     3.9    30.6    -      -       +      +
    322B  ASP*     2.7    42.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 81 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  ILE*     3.9    28.7    -      -       +      +
     19A  ALA*     4.1     7.0    -      -       -      +
     20A  TYR*     3.7    35.2    -      -       +      -
     53A  LEU*     3.7    33.5    -      -       +      +
     56A  GLY*     3.9    30.1    -      -       -      -
     57A  ILE*     3.7    11.2    -      -       +      -
     77A  MET      2.9    23.2    +      -       -      +
     78A  GLN*     3.2    11.6    +      -       -      +
     80A  LYS*     1.3    78.3    -      -       -      +
     82A  LYS*     1.3    55.3    +      -       -      +
     84A  THR*     3.4     1.3    +      -       -      +
     85A  LEU*     2.8    31.4    +      -       -      +
    321B  PHE*     4.4     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 82 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  ILE*     3.6    36.8    -      -       +      -
     78A  GLN*     2.9    26.3    +      -       -      +
     79A  GLN*     3.3    16.2    +      -       -      +
     81A  MET*     1.3    75.5    -      -       -      +
     83A  GLU*     1.3    63.3    +      -       -      +
     85A  LEU*     3.4     4.4    +      -       +      +
     86A  GLN*     3.2    35.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 83 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79A  GLN*     3.2    17.8    +      -       -      +
     80A  LYS*     3.6    16.4    +      -       -      +
     82A  LYS*     1.3    79.2    -      -       -      +
     84A  THR*     1.3    61.9    +      -       -      +
     86A  GLN*     3.3    17.4    +      -       -      +
     87A  ASN*     3.2    26.2    +      -       -      +
    322B  ASP*     4.8    10.7    -      -       -      +
    325B  SER*     3.4    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 84 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  VAL*     4.2    15.0    -      -       +      -
     53A  LEU*     4.0    10.8    -      -       +      -
     80A  LYS      3.1    12.5    +      -       -      -
     81A  MET      3.9     2.7    -      -       -      -
     83A  GLU*     1.3    73.9    -      -       -      +
     85A  LEU*     1.3    61.4    +      -       -      +
     87A  ASN*     3.1     9.3    +      -       -      +
     88A  VAL*     2.8    45.7    +      -       +      +
    321B  PHE*     3.1    45.5    +      -       +      +
    324B  LEU*     4.2     5.9    -      -       +      +
    325B  SER*     4.5     4.5    +      -       -      -
    328B  PHE*     4.9     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 85 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  ILE*     4.0    22.4    -      -       +      -
     53A  LEU*     3.7    20.4    -      -       +      +
     54A  LEU*     3.8    22.9    -      -       +      -
     57A  ILE*     3.7    23.1    -      -       +      -
     81A  MET      2.8    18.7    +      -       -      +
     82A  LYS*     3.7     5.8    -      -       -      +
     84A  THR*     1.3    77.6    -      -       -      +
     86A  GLN*     1.3    63.7    +      -       +      +
     88A  VAL*     3.9     1.0    -      -       -      +
     89A  ARG*     2.9    63.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 86 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82A  LYS*     3.2    23.9    +      -       -      +
     83A  GLU*     3.5    12.7    -      -       -      +
     84A  THR      3.2     0.2    -      -       -      -
     85A  LEU*     1.3    79.5    -      -       +      +
     87A  ASN*     1.3    66.1    +      -       -      +
     89A  ARG*     3.8     5.3    -      -       -      +
     90A  THR*     3.1    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 87 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83A  GLU*     3.2    20.2    +      -       -      +
     84A  THR*     3.1     8.7    +      -       -      +
     86A  GLN*     1.3    81.7    -      -       -      +
     88A  VAL*     1.3    61.6    +      -       -      +
     90A  THR*     3.4     7.3    +      -       -      -
     91A  ARG*     3.0    23.6    +      -       -      +
    325B  SER*     3.4    37.2    +      -       -      +
    328B  PHE*     3.7    30.4    -      -       +      +
    329B  GLU*     5.2     6.2    -      -       -      +
    332B  LYS*     5.7     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 88 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  VAL*     3.8    16.8    -      -       +      -
     46A  TYR*     3.7    35.4    -      -       +      +
     50A  ILE*     3.7    25.1    -      -       +      +
     53A  LEU*     4.4     2.2    -      -       +      -
     84A  THR*     2.8    38.9    +      -       +      +
     85A  LEU*     4.0     3.1    -      -       -      +
     87A  ASN*     1.3    69.2    -      -       -      +
     89A  ARG*     1.3    61.0    +      -       -      +
     91A  ARG*     3.3     1.0    +      -       -      +
     92A  LEU*     2.8    29.3    +      -       -      +
    328B  PHE*     3.6    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 89 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  ILE*     3.8    24.3    -      -       +      +
     54A  LEU*     3.8    33.8    -      -       -      +
     85A  LEU*     2.9    47.8    +      -       +      +
     86A  GLN*     3.8     5.8    -      -       -      +
     88A  VAL*     1.3    77.5    -      -       -      +
     90A  THR*     1.3    63.0    +      -       -      +
     92A  LEU*     3.5     5.9    +      -       -      +
     93A  GLU*     3.1    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 90 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86A  GLN      3.1    15.1    +      -       -      -
     87A  ASN*     3.6    10.7    -      -       -      -
     88A  VAL      3.2     0.2    -      -       -      -
     89A  ARG*     1.3    77.9    -      -       -      +
     91A  ARG*     1.3    63.5    +      -       -      +
     93A  GLU*     3.2     7.4    +      -       -      +
     94A  ILE*     3.0    32.6    +      -       +      +
    332B  LYS*     4.8    21.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 91 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  ASP*     2.7    42.8    +      -       -      +
     39A  LYS*     5.0     2.8    -      -       -      +
     46A  TYR*     3.6    17.7    -      -       +      +
     87A  ASN      3.0    17.5    +      -       -      +
     88A  VAL      3.9     2.0    -      -       -      +
     90A  THR*     1.3    77.6    -      -       -      +
     92A  LEU*     1.3    58.4    +      -       -      +
     94A  ILE*     3.2    22.6    +      -       -      +
     95A  LEU*     2.9    47.9    +      -       +      +
    100A  ALA*     3.9    15.0    -      -       -      +
    101A  THR*     5.0     4.8    +      -       -      +
    328B  PHE*     3.7    19.3    -      -       +      -
    331B  LEU*     3.8    42.5    +      -       -      +
    332B  LYS*     5.3     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 92 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LYS*     3.9    41.3    -      -       +      +
     46A  TYR*     4.4    11.6    -      -       +      -
     47A  LYS*     3.6    26.2    -      -       +      +
     50A  ILE*     3.7    21.5    -      -       +      -
     88A  VAL      2.8    18.8    +      -       -      +
     89A  ARG*     3.8     5.2    -      -       -      +
     91A  ARG*     1.3    78.6    -      -       -      +
     93A  GLU*     1.3    56.7    +      -       -      +
     95A  LEU*     3.3     2.8    +      -       -      -
     96A  GLU*     2.9    57.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 93 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  ARG      3.1    18.6    +      -       -      +
     90A  THR*     3.8     5.6    -      -       -      +
     92A  LEU*     1.3    76.6    -      -       -      +
     94A  ILE*     1.3    63.6    +      -       +      +
     96A  GLU*     3.3    11.1    +      -       -      +
     97A  LYS*     3.0    54.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 94 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90A  THR*     3.0    27.8    +      -       +      +
     91A  ARG*     3.5    26.5    -      -       -      +
     92A  LEU      3.2     0.2    -      -       -      -
     93A  GLU*     1.3    79.2    -      -       +      +
     95A  LEU*     1.3    60.3    +      -       -      +
     97A  LYS*     3.4     1.9    +      -       -      -
     98A  GLY      3.1     4.2    +      -       -      -
     99A  LEU*     2.9    54.5    +      -       +      +
    100A  ALA*     3.8    26.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 95 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  ASP*     3.8    19.3    -      -       -      +
     39A  LYS*     3.8    27.5    -      -       +      +
     42A  ALA*     4.3     9.4    -      -       +      -
     43A  LYS*     3.9    37.4    +      -       +      -
     46A  TYR*     3.8    19.5    -      -       +      -
     91A  ARG*     2.9    32.9    +      -       -      +
     92A  LEU*     3.8     4.0    -      -       -      +
     94A  ILE*     1.3    73.7    -      -       -      +
     96A  GLU*     1.3    65.6    +      -       -      +
     98A  GLY*     3.2    13.2    +      -       -      +
     99A  LEU      5.0     0.4    -      -       -      +
    100A  ALA*     3.8    26.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 96 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LYS*     3.9    24.3    +      -       +      +
     47A  LYS*     4.5    10.2    -      -       -      +
     92A  LEU*     2.9    44.7    +      -       +      +
     93A  GLU*     3.8    12.3    -      -       +      +
     95A  LEU*     1.3    77.2    -      -       -      +
     97A  LYS*     1.3    64.7    +      -       +      +
     98A  GLY      3.2     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 97 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93A  GLU*     3.0    44.8    +      -       +      +
     94A  ILE      4.2     0.2    -      -       -      +
     96A  GLU*     1.3    80.3    -      -       +      +
     98A  GLY*     1.3    63.2    +      -       -      +
     99A  LEU*     3.3    31.4    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il