Contacts of the helix formed by residues 2 - 26 (chain Q) in PDB entry 2JA7


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 2 (chain Q).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3Q  GLN*     1.3    78.7    +      -       +      +
      4Q  GLU      2.8     5.5    +      -       -      -
      5Q  ASN*     3.0    23.0    +      -       -      +
      6Q  GLU*     3.0    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 3 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2Q  ASP*     1.3    83.7    -      -       +      +
      4Q  GLU*     1.3    66.5    +      -       +      +
      6Q  GLU*     3.4    12.1    +      -       -      +
      7Q  ARG*     3.4    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 4 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1218M  GLN*     3.9    21.2    +      -       -      +
      2Q  ASP      2.8     5.2    +      -       -      +
      3Q  GLN*     1.3    81.4    -      -       +      +
      5Q  ASN*     1.3    68.3    +      -       -      +
      6Q  GLU      3.2     0.6    +      -       -      -
      7Q  ARG*     3.4     6.4    +      -       -      +
      8Q  ASN*     3.2    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 5 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2Q  ASP      3.0    15.4    +      -       -      +
      4Q  GLU*     1.3    80.7    +      -       -      +
      6Q  GLU*     1.3    61.0    +      -       -      +
      7Q  ARG      3.3     0.7    -      -       -      -
      8Q  ASN*     3.6    19.4    +      -       +      +
      9Q  ILE*     3.0    34.8    +      -       +      +
     52Q  ARG*     4.4    29.4    -      -       +      +
     53Q  PRO*     6.3     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 6 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2Q  ASP*     3.0    52.9    +      -       -      +
      3Q  GLN*     3.4    11.1    +      -       -      +
      4Q  GLU      3.2     0.2    -      -       -      -
      5Q  ASN*     1.3    78.9    -      -       -      +
      7Q  ARG*     1.3    60.4    +      -       +      +
      9Q  ILE*     3.5     7.5    +      -       -      +
     10Q  SER*     3.1    25.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 7 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1137M  ALA*     6.2     1.8    -      -       -      +
   1320M  PRO*     5.6    14.7    -      -       +      +
      3Q  GLN*     3.4    19.5    +      -       -      +
      4Q  GLU*     3.4     8.2    +      -       -      +
      5Q  ASN      3.3     0.2    -      -       -      -
      6Q  GLU*     1.3    77.0    -      -       +      +
      8Q  ASN*     1.3    58.4    +      -       -      +
      9Q  ILE      3.0     6.5    +      -       -      -
     10Q  SER*     3.9     8.4    -      -       -      -
     11Q  ARG*     3.1    34.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 8 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4Q  GLU      3.2    15.9    +      -       -      +
      5Q  ASN*     3.8    20.9    +      -       +      +
      6Q  GLU      3.4     0.6    -      -       -      -
      7Q  ARG*     1.3    76.4    -      -       -      +
      9Q  ILE*     1.3    61.8    +      -       +      +
     11Q  ARG*     4.2     7.8    -      -       -      +
     12Q  LEU*     3.7    16.4    +      -       -      +
     53Q  PRO*     5.5     1.4    -      -       -      +
     55Q  ARG*     4.1    15.8    +      -       -      -
    113Q  GLN*     5.4     0.7    -      -       -      +
    137Q  GLU*     5.3     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 9 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5Q  ASN*     3.0    21.5    +      -       +      +
      6Q  GLU*     3.7     6.5    -      -       -      +
      7Q  ARG      3.0     0.4    -      -       -      -
      8Q  ASN*     1.3    79.8    -      -       +      +
     10Q  SER*     1.3    55.9    +      -       -      +
     11Q  ARG      2.8     4.7    -      -       -      -
     12Q  LEU*     2.8     6.8    +      -       +      +
     13Q  TRP*     2.7    33.6    +      -       -      +
     39Q  LEU*     5.1     6.3    -      -       +      -
     42Q  PHE*     4.4    20.9    -      -       +      -
     43Q  LYS*     5.7     6.7    -      -       +      -
     47Q  CYS*     5.1     8.3    -      -       -      -
     51Q  GLY      3.7    16.8    -      -       -      +
     52Q  ARG*     4.6     0.7    -      -       +      -
     53Q  PRO*     3.3    43.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 10 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6Q  GLU      3.1    15.3    +      -       -      -
      7Q  ARG*     3.5    10.5    +      -       -      -
      9Q  ILE*     1.3    79.5    -      -       -      +
     11Q  ARG*     1.3    58.6    +      -       -      +
     13Q  TRP*     3.5    20.8    -      -       -      +
     14Q  ARG*     3.1    30.4    +      -       -      +
     39Q  LEU*     4.6    15.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 11 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1318M  THR*     3.6    31.0    +      -       -      +
   1320M  PRO*     6.5     0.7    -      -       +      -
      7Q  ARG*     3.1    22.1    +      -       +      +
      8Q  ASN*     4.5     7.2    -      -       -      +
      9Q  ILE      2.8     1.2    +      -       -      -
     10Q  SER*     1.3    77.8    -      -       -      +
     12Q  LEU*     1.3    57.3    +      -       -      +
     13Q  TRP      2.9     4.4    +      -       -      -
     14Q  ARG*     3.1     7.9    +      -       -      +
     15Q  ALA*     2.7    34.0    +      -       -      +
    137Q  GLU*     5.6     2.0    -      -       -      +
    138Q  ALA*     3.7    23.2    -      -       -      +
    141Q  VAL*     3.5    34.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 12 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8Q  ASN      3.7    14.5    +      -       -      +
      9Q  ILE*     2.8    13.9    +      -       +      +
     11Q  ARG*     1.3    75.4    -      -       -      +
     13Q  TRP*     1.3    62.1    +      -       -      +
     15Q  ALA*     4.1     7.0    -      -       +      -
     16Q  PHE*     3.0    19.8    +      -       -      +
     42Q  PHE*     4.8     4.9    -      -       +      -
     53Q  PRO*     3.8    27.8    -      -       +      -
     55Q  ARG*     3.8    24.9    -      -       +      +
     58Q  MET*     3.7    34.3    -      -       +      -
     82Q  PHE*     4.5    12.1    -      -       +      -
    137Q  GLU*     3.7    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 13 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9Q  ILE      2.7    14.7    +      -       -      +
     10Q  SER*     3.5    19.5    -      -       -      +
     11Q  ARG      2.9     0.6    -      -       -      -
     12Q  LEU*     1.3    74.8    -      -       -      +
     14Q  ARG*     1.3    82.1    -      -       +      +
     16Q  PHE*     2.7    28.1    +      +       +      +
     17Q  ARG*     2.9    28.1    +      -       +      +
     35Q  VAL      5.4     1.6    +      -       -      -
     36Q  GLU      5.6     0.7    -      -       -      -
     37Q  LEU*     3.1    25.4    +      -       +      +
     38Q  PRO*     3.8     4.4    -      -       +      -
     39Q  LEU*     3.5    53.2    -      -       +      -
     42Q  PHE*     3.7    39.7    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 14 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1121M  GLU*     5.0     9.1    +      -       -      -
   1317M  MET      4.6     0.6    +      -       -      -
   1318M  THR*     3.2    29.1    +      -       -      +
   1319M  VAL      4.5     8.8    +      -       -      -
   1320M  PRO*     5.1     6.3    -      -       -      +
   1322M  ILE      5.9     0.4    +      -       -      -
   1324M  PRO*     5.3     9.7    -      -       -      +
     10Q  SER*     3.1    20.6    +      -       -      +
     11Q  ARG*     3.1     7.5    +      -       -      +
     13Q  TRP*     1.3    95.4    -      -       +      +
     15Q  ALA*     1.3    66.5    +      -       -      +
     17Q  ARG*     2.7    33.2    +      -       -      +
     18Q  THR*     3.1     7.4    +      -       -      -
    141Q  VAL*     3.2    44.3    +      -       +      +
    142Q  VAL*     3.9     9.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 15 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11Q  ARG      2.7    22.2    +      -       -      +
     12Q  LEU*     3.8    12.8    -      -       +      +
     14Q  ARG*     1.3    72.7    -      -       -      +
     16Q  PHE*     1.3    62.6    +      -       -      +
     18Q  THR*     3.6     4.3    +      -       -      -
     19Q  VAL*     2.9    24.4    +      -       -      +
     82Q  PHE*     5.6     1.6    -      -       +      -
    111Q  VAL*     6.5     0.2    -      -       +      -
    137Q  GLU*     4.3    21.5    -      -       +      +
    140Q  LEU*     3.5    18.5    -      -       +      +
    141Q  VAL*     3.8    16.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 16 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12Q  LEU      3.0    14.4    +      -       -      +
     13Q  TRP*     2.7    26.0    +      +       -      +
     15Q  ALA*     1.3    70.9    -      -       -      +
     17Q  ARG*     1.3    55.8    +      -       -      +
     19Q  VAL*     2.6    40.8    +      -       +      +
     20Q  LYS*     3.1    46.5    +      -       +      -
     34Q  GLU      5.3     0.9    -      -       -      -
     37Q  LEU*     4.8    14.6    -      -       +      -
     42Q  PHE*     4.9     6.3    -      +       -      -
     46Q  TYR*     4.4    19.5    -      +       -      -
     58Q  MET*     4.0    35.7    -      -       +      -
     60Q  PHE*     5.5     9.0    -      +       -      -
     82Q  PHE*     3.6    34.1    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 17 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13Q  TRP*     2.9    27.1    +      -       -      +
     14Q  ARG*     2.7    22.8    +      -       -      +
     16Q  PHE*     1.3    79.9    -      -       -      +
     18Q  THR*     1.3    65.6    +      -       -      +
     20Q  LYS*     3.0    19.1    +      -       -      +
     21Q  GLU*     3.0    43.1    +      -       -      +
     32Q  GLN*     5.6     2.8    -      -       -      +
     35Q  VAL*     4.2    25.9    +      -       +      +
     36Q  GLU*     4.6    26.1    -      -       -      +
    146Q  HIS*     5.6     2.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 18 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14Q  ARG      3.1     4.7    +      -       -      -
     15Q  ALA      3.7     2.7    -      -       -      -
     16Q  PHE      2.9     1.4    +      -       -      -
     17Q  ARG*     1.3    76.0    -      -       -      +
     19Q  VAL*     1.3    67.5    +      -       -      +
     20Q  LYS      2.8     1.0    +      -       -      -
     21Q  GLU*     2.8    14.1    +      -       -      -
     22Q  MET*     2.7    25.4    +      -       +      +
    140Q  LEU*     2.7    46.9    +      -       +      +
    141Q  VAL      3.9     3.3    +      -       -      -
    142Q  VAL*     3.8     1.1    -      -       -      +
    143Q  ASN*     3.7    40.9    +      -       +      +
    187Q  TYR*     4.5     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 19 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15Q  ALA      2.9    21.5    -      -       -      +
     16Q  PHE*     2.6    22.6    +      -       +      +
     18Q  THR*     1.3    73.9    -      -       -      +
     20Q  LYS*     1.3    53.2    +      -       -      +
     22Q  MET*     3.8     9.6    -      -       +      +
     23Q  VAL*     2.7    38.1    +      -       +      +
     60Q  PHE*     5.2     3.6    -      -       +      -
     80Q  VAL*     3.7    35.9    -      -       +      -
     82Q  PHE*     4.1    16.4    -      -       +      -
    109Q  ILE*     5.1     5.8    -      -       +      -
    111Q  VAL*     4.8     5.2    -      -       +      -
    140Q  LEU*     4.0    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 20 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16Q  PHE*     3.1    47.9    -      -       +      +
     17Q  ARG*     3.0    13.8    +      -       -      +
     18Q  THR      2.8     1.4    +      -       -      -
     19Q  VAL*     1.3    76.1    -      -       +      +
     21Q  GLU*     1.3    60.5    +      -       -      +
     23Q  VAL*     2.6    28.0    +      -       -      +
     24Q  LYS      3.0     8.3    +      -       -      -
     30Q  ILE*     3.4    16.8    -      -       +      +
     34Q  GLU*     3.3    49.3    +      -       +      +
     35Q  VAL*     4.3    16.4    -      -       +      -
     37Q  LEU*     6.2     0.7    -      -       -      -
     46Q  TYR*     5.5     2.0    +      -       -      -
     60Q  PHE*     3.3    34.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 21 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17Q  ARG*     3.3    41.6    +      -       -      +
     18Q  THR*     2.8    19.9    +      -       -      +
     20Q  LYS*     1.3    73.0    -      -       -      +
     22Q  MET*     1.3    65.0    +      -       -      +
     24Q  LYS*     2.8    26.7    +      -       +      +
     25Q  ASP*     3.0    16.8    +      -       -      +
     32Q  GLN*     5.7     1.6    +      -       -      +
     35Q  VAL*     3.9    19.5    -      -       +      +
    143Q  ASN*     3.3    22.2    +      -       -      +
    146Q  HIS*     3.5    24.2    +      -       +      -
    187Q  TYR*     3.7    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 22 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18Q  THR*     2.7    19.1    +      -       +      +
     19Q  VAL*     3.8     8.3    -      -       +      +
     21Q  GLU*     1.3    72.9    -      -       -      +
     23Q  VAL*     1.3    65.6    +      -       +      +
     24Q  LYS      3.1     0.2    +      -       -      -
     25Q  ASP*     3.3     1.0    +      -       -      +
     26Q  ARG*     2.8    68.1    +      -       +      +
    109Q  ILE*     3.7    20.0    -      -       +      -
    135Q  PHE*     3.6    28.9    -      -       +      -
    140Q  LEU*     5.1     5.2    -      -       -      -
    187Q  TYR*     2.9    62.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 23 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19Q  VAL*     2.7    27.9    +      -       +      +
     20Q  LYS*     2.6    15.4    +      -       -      +
     22Q  MET*     1.3    73.8    -      -       +      +
     24Q  LYS*     1.3    57.3    +      -       -      +
     26Q  ARG*     3.8     8.2    -      -       -      +
     28Q  TYR*     2.9    46.2    +      -       +      +
     30Q  ILE*     3.7    13.2    -      -       +      -
     60Q  PHE*     4.5     4.7    -      -       +      -
     62Q  ALA*     3.9    14.8    -      -       +      -
     78Q  LEU*     3.7    14.8    -      -       +      -
     80Q  VAL*     4.2    22.0    -      -       +      -
    109Q  ILE*     4.7     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 24 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20Q  LYS      3.0     3.6    +      -       -      +
     21Q  GLU*     2.8    25.1    +      -       -      +
     23Q  VAL*     1.3    69.2    -      -       -      +
     25Q  ASP*     1.3    74.7    +      -       -      +
     26Q  ARG      3.0     1.1    -      -       -      -
     27Q  GLY*     2.8    19.6    +      -       -      -
     28Q  TYR      3.1    20.2    +      -       -      +
     30Q  ILE*     3.8    45.1    +      -       +      +
     31Q  THR      4.9     0.4    -      -       -      -
     32Q  GLN*     3.8    28.7    +      -       -      +
     35Q  VAL*     5.5     4.7    -      -       +      -
     65Q  THR*     5.7     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 25 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21Q  GLU*     3.0    13.2    +      -       -      +
     22Q  MET      3.9     2.9    -      -       -      +
     24Q  LYS*     1.3    91.6    -      -       -      +
     26Q  ARG*     1.3    61.9    +      -       -      +
     27Q  GLY*     3.1     2.3    +      -       -      -
    143Q  ASN*     4.8     0.9    +      -       -      -
    145Q  THR*     5.2     0.7    +      -       -      -
    146Q  HIS*     5.8     1.9    -      -       -      -
    187Q  TYR*     2.9    36.5    +      -       +      -
    188Q  LEU*     4.8    12.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 26 (chain Q). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22Q  MET*     2.8    61.9    +      -       -      +
     23Q  VAL*     3.8     9.6    -      -       -      +
     24Q  LYS      3.0     0.2    -      -       -      -
     25Q  ASP*     1.3    77.4    -      -       -      +
     27Q  GLY*     1.3    57.3    +      -       -      +
     28Q  TYR*     4.1    16.8    -      -       +      -
     72Q  PHE*     5.7     2.8    -      -       -      -
     75Q  MET*     3.7    17.3    -      -       +      +
     78Q  LEU*     4.9     3.1    -      -       -      -
    107Q  THR*     4.5    11.3    -      -       -      +
    109Q  ILE*     4.1     8.1    -      -       -      +
    133Q  GLU*     2.7    45.5    +      -       -      -
    135Q  PHE*     3.8     2.6    -      -       -      -
    155Q  ARG*     4.9    14.7    +      -       -      +
    186Q  LEU      3.4     8.9    +      -       -      -
    187Q  TYR      3.5    13.0    +      -       -      +
    188Q  LEU*     3.7    29.7    +      -       -      +
    189Q  GLY*     4.0     3.6    +      -       -      -
----------------------------------------------------------
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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