Contacts of the helix formed by residues 979 - 1007 (chain A) in PDB entry 1OW8


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 979 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    975A  LEU*     4.5     1.0    -      -       -      +
    976A  PRO*     2.7    27.0    +      -       +      +
    978A  SER*     1.3    79.9    -      -       -      +
    980A  HIS*     1.3    71.0    +      -       -      +
    981A  ARG      2.9     4.5    +      -       -      -
    982A  GLU*     3.3    19.5    +      -       -      +
    983A  ILE*     3.4    20.5    +      -       -      +
   1037A  VAL*     5.6     2.7    -      -       -      -
   1041A  ALA*     3.9    30.7    -      -       +      +
   1044A  LYS*     4.2    25.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 980 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    972A  ILE*     3.2    39.9    +      -       +      +
    973A  PRO*     4.7     5.6    -      -       +      -
    975A  LEU*     2.5    27.8    +      -       +      -
    976A  PRO      3.0    21.7    +      -       -      -
    977A  ALA*     3.1    27.9    +      -       +      +
    979A  THR*     1.3    80.3    +      -       -      +
    981A  ARG*     1.3    58.2    +      -       -      +
    983A  ILE*     3.9     8.7    -      -       +      +
    984A  GLU*     2.8    37.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 981 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    977A  ALA      4.8     0.6    +      -       -      -
    978A  SER      5.1     1.0    +      -       -      -
    979A  THR      2.9     1.0    +      -       -      -
    980A  HIS*     1.3    75.9    -      -       +      +
    982A  GLU*     1.3    68.2    +      -       -      +
    983A  ILE      3.0     1.6    -      -       -      -
    984A  GLU*     3.5    18.2    -      -       +      +
    985A  MET*     2.9    61.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 982 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    978A  SER      5.7     0.2    +      -       -      -
    979A  THR*     3.3    14.4    +      -       -      +
    981A  ARG*     1.3    76.5    -      -       -      +
    983A  ILE*     1.3    57.4    +      -       -      +
    985A  MET*     3.2     7.4    +      -       +      +
    986A  ALA*     3.0    27.4    +      -       -      +
   1037A  VAL*     4.0    32.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 983 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    968A  VAL*     3.8    27.6    -      -       +      -
    972A  ILE*     4.0    15.5    -      -       +      -
    975A  LEU*     4.0    19.5    -      -       +      -
    979A  THR*     3.4    21.1    +      -       -      +
    980A  HIS*     3.9     9.0    -      -       +      +
    981A  ARG      3.0     0.2    -      -       -      -
    982A  GLU*     1.3    74.2    -      -       -      +
    984A  GLU*     1.3    67.0    +      -       -      +
    985A  MET      3.0     1.6    -      -       -      -
    986A  ALA*     3.3     8.6    +      -       -      +
    987A  GLN*     2.9    28.0    +      -       -      +
   1034A  LEU*     4.4     5.4    -      -       +      -
   1037A  VAL*     3.4    25.8    -      -       +      -
   1038A  ILE*     3.6    23.8    -      -       +      -
   1041A  ALA*     4.7     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 984 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    972A  ILE*     4.3    16.0    -      -       -      +
    980A  HIS*     2.8    30.8    +      -       -      +
    981A  ARG*     3.0    22.5    +      -       +      +
    983A  ILE*     1.3    80.2    -      -       -      +
    985A  MET*     1.3    60.1    +      -       +      +
    987A  GLN*     3.4    16.9    +      -       +      +
    988A  LYS*     3.2    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 985 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    981A  ARG*     2.9    48.6    +      -       -      +
    982A  GLU*     3.5     9.6    -      -       -      +
    984A  GLU*     1.3    76.9    -      -       -      +
    986A  ALA*     1.3    66.8    +      -       -      +
    987A  GLN      3.0     1.3    -      -       -      -
    988A  LYS*     3.1    39.9    +      -       +      +
    989A  LEU*     3.0    24.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 986 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    982A  GLU      3.0    13.0    +      -       -      +
    983A  ILE*     3.6     4.3    -      -       -      +
    985A  MET*     1.3    77.2    -      -       -      +
    987A  GLN*     1.3    62.5    +      -       -      +
    989A  LEU*     3.4    12.1    +      -       -      +
    990A  LEU*     3.2    28.4    +      -       -      +
   1030A  ASP*     5.3     2.7    -      -       -      +
   1033A  ASN*     5.0     9.0    -      -       -      +
   1034A  LEU*     3.5    36.1    -      -       +      +
   1037A  VAL*     5.1     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 987 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    965A  LEU*     3.4    43.8    +      -       +      +
    968A  VAL*     3.9    23.0    -      -       +      +
    969A  ASP*     3.0    25.0    +      -       -      +
    972A  ILE*     3.7    20.6    -      -       -      +
    983A  ILE*     2.9    15.0    +      -       -      +
    984A  GLU*     3.4    21.3    -      -       -      +
    985A  MET      3.0     0.4    -      -       -      -
    986A  ALA*     1.3    76.5    -      -       -      +
    988A  LYS*     1.3    64.0    +      -       -      +
    989A  LEU      3.3     0.3    +      -       -      -
    990A  LEU*     3.3     7.6    +      -       -      +
    991A  ASN*     3.3    23.7    +      -       -      +
   1034A  LEU*     4.5     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 988 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    984A  GLU      3.2    13.0    +      -       -      +
    985A  MET*     3.1    46.5    +      -       -      +
    987A  GLN*     1.3    77.1    -      -       -      +
    989A  LEU*     1.3    57.2    +      -       -      +
    991A  ASN*     3.0    12.0    +      -       +      +
    992A  SER*     2.9    29.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 989 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    985A  MET      3.0    12.6    +      -       -      +
    986A  ALA*     3.4    14.8    -      -       -      +
    988A  LYS*     1.3    75.1    -      -       -      +
    990A  LEU*     1.3    66.2    +      -       -      +
    992A  SER*     3.0    13.7    +      -       -      +
    993A  ASP*     2.9    36.9    +      -       -      +
   1030A  ASP*     3.0    36.3    -      -       +      +
   1033A  ASN*     6.1     1.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 990 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    931A  LEU*     4.8     0.2    -      -       +      -
    961A  LEU*     3.7    25.1    -      -       +      +
    964A  LEU*     4.3     4.3    -      -       +      -
    965A  LEU*     4.1    12.1    -      -       +      -
    986A  ALA      3.2    11.1    +      -       -      +
    987A  GLN      3.5     7.0    -      -       -      +
    989A  LEU*     1.3    79.2    -      -       -      +
    991A  ASN*     1.3    61.5    +      -       -      +
    993A  ASP*     3.1     2.7    +      -       -      -
    994A  LEU      3.1    18.0    +      -       -      -
   1027A  LEU*     3.6    32.9    -      -       +      +
   1030A  ASP*     3.7     9.4    -      -       +      +
   1031A  ALA*     3.3    39.7    -      -       +      +
   1034A  LEU*     3.5    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 991 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    961A  LEU*     4.3     8.1    -      -       -      +
    965A  LEU*     3.5    30.4    -      -       -      +
    987A  GLN*     3.3    11.9    +      -       -      +
    988A  LYS*     3.0    13.6    +      -       -      +
    990A  LEU*     1.3    79.0    -      -       -      +
    992A  SER*     1.3    59.5    +      -       -      +
    994A  LEU*     3.4     6.6    +      -       -      +
    995A  GLY*     2.9    24.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 992 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    988A  LYS      2.9    11.8    +      -       -      -
    989A  LEU*     3.2    18.8    -      -       -      +
    991A  ASN*     1.3    78.7    -      -       -      +
    993A  ASP*     1.3    56.7    +      -       -      -
    995A  GLY*     2.9     4.6    +      -       -      -
    996A  GLU*     2.9    39.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 993 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    989A  LEU*     2.9    33.9    +      -       -      +
    990A  LEU      3.1     0.6    +      -       -      +
    992A  SER*     1.3    73.0    +      -       -      +
    994A  LEU*     1.3    62.6    +      -       -      +
    995A  GLY      2.9     2.0    -      -       -      -
    996A  GLU*     3.3    14.9    +      -       -      +
    997A  LEU*     2.9    28.1    +      -       -      +
   1023A  ALA*     4.5     7.1    -      -       -      +
   1026A  ALA*     3.0    26.0    -      -       -      +
   1027A  LEU*     3.5    28.2    -      -       +      +
   1030A  ASP*     2.8    23.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 994 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    954A  VAL*     4.6     5.2    -      -       +      +
    957A  VAL*     4.3     9.4    -      -       +      -
    958A  GLY*     3.7    31.6    -      -       -      +
    961A  LEU*     3.8    21.8    -      -       +      -
    962A  ARG*     5.2     6.5    -      -       +      +
    990A  LEU      3.1    15.0    +      -       -      +
    991A  ASN*     3.8     7.2    -      -       -      +
    993A  ASP*     1.3    77.3    -      -       -      +
    995A  GLY*     1.3    63.6    +      -       -      +
    997A  LEU*     4.3    20.2    -      -       +      -
    998A  ILE*     3.0    47.9    +      -       +      +
   1027A  LEU*     4.4     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 995 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    991A  ASN      2.9    14.6    +      -       -      -
    992A  SER*     2.9     8.2    +      -       -      -
    994A  LEU*     1.3    79.7    -      -       -      +
    996A  GLU*     1.3    62.2    +      -       -      -
    997A  LEU      3.0     0.5    +      -       -      -
    998A  ILE*     3.1     6.3    +      -       -      +
    999A  ASN*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 996 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    992A  SER*     2.9    27.3    +      -       -      +
    993A  ASP*     3.3    15.9    +      -       -      +
    995A  GLY*     1.3    70.6    -      -       -      +
    997A  LEU*     1.3    59.9    +      -       -      +
    998A  ILE      3.3     0.2    -      -       -      -
    999A  ASN*     3.4    15.0    -      -       -      +
   1000A  LYS*     3.0    39.2    +      -       +      +
   1023A  ALA*     4.2    11.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 997 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    938A  MET*     3.9    25.6    -      -       +      -
    954A  VAL*     4.3    25.1    -      -       +      -
    957A  VAL*     4.2    19.7    -      -       +      -
    993A  ASP      2.9    16.3    +      -       -      +
    994A  LEU*     3.8    10.1    -      -       +      +
    995A  GLY      3.1     0.4    -      -       -      -
    996A  GLU*     1.3    75.2    -      -       -      +
    998A  ILE*     1.3    67.8    +      -       -      +
   1000A  LYS*     3.2     1.9    +      -       -      -
   1001A  MET*     2.9    20.6    +      -       -      +
   1020A  MET*     3.7    39.7    -      -       +      +
   1023A  ALA*     3.6    12.8    -      -       +      -
   1024A  ALA*     4.4     9.9    -      -       -      +
   1027A  LEU*     4.5     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 998 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    954A  VAL*     4.1    20.2    -      -       +      -
    994A  LEU*     3.0    40.7    +      -       +      +
    995A  GLY*     3.6     5.2    -      -       -      +
    997A  LEU*     1.3    76.9    -      -       -      +
    999A  ASN*     1.3    67.7    +      -       -      +
   1001A  MET*     3.1    18.2    +      -       +      +
   1002A  LYS*     3.1    47.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 999 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    995A  GLY      3.0    16.5    +      -       -      +
    996A  GLU*     3.4    20.8    -      -       -      +
    998A  ILE*     1.3    80.7    -      -       -      +
   1000A  LYS*     1.3    68.3    +      -       +      +
   1002A  LYS*     3.1    18.5    +      -       -      +
   1003A  LEU*     3.2    20.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS1000 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    996A  GLU*     3.0    24.5    -      -       -      +
    997A  LEU*     3.2     4.5    +      -       -      +
    999A  ASN*     1.3    75.5    -      -       +      +
   1001A  MET*     1.3    66.1    +      -       -      +
   1002A  LYS      3.0     1.3    -      -       -      -
   1003A  LEU*     3.3    19.3    +      -       +      +
   1004A  ALA*     3.0    23.9    +      -       -      +
   1016A  TYR*     4.5     6.4    -      -       +      +
   1019A  GLN*     3.0    51.9    +      -       +      +
   1020A  MET*     4.0    24.3    -      -       +      +
   1023A  ALA*     5.2     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET1001 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    950A  TYR*     4.0    20.5    -      -       +      -
    951A  VAL*     3.4    42.0    -      -       +      -
    954A  VAL*     3.9    18.2    -      -       +      -
    997A  LEU      2.9    13.0    +      -       -      +
    998A  ILE*     3.1    34.5    +      -       +      +
   1000A  LYS*     1.3    79.8    -      -       -      +
   1002A  LYS*     1.3    74.1    +      -       +      +
   1004A  ALA*     3.6     3.0    +      -       -      +
   1005A  GLN*     3.2    25.6    +      -       -      +
   1020A  MET*     3.8    22.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS1002 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    998A  ILE*     3.1    37.0    +      -       +      +
    999A  ASN*     3.6    11.4    -      -       -      +
   1000A  LYS      3.0     0.8    -      -       -      -
   1001A  MET*     1.3    85.7    -      -       +      +
   1003A  LEU*     1.3    70.2    +      -       -      +
   1005A  GLN*     3.1    18.6    +      -       -      +
   1006A  GLN*     3.0    23.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU1003 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    999A  ASN*     3.2    14.9    +      -       +      +
   1000A  LYS*     3.6    21.5    -      -       +      +
   1002A  LYS*     1.3    78.5    -      -       -      +
   1004A  ALA*     1.3    63.7    +      -       -      +
   1006A  GLN*     2.9    34.0    +      -       -      +
   1007A  TYR*     3.1    30.6    +      -       +      +
   1016A  TYR*     3.8    38.8    -      -       +      +
   1019A  GLN*     5.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA1004 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    950A  TYR*     3.1    25.6    +      -       +      +
   1000A  LYS      3.0    15.5    +      -       -      +
   1001A  MET      3.7     8.7    -      -       -      +
   1002A  LYS      3.4     0.2    -      -       -      -
   1003A  LEU*     1.3    72.1    -      -       -      +
   1005A  GLN*     1.3    60.0    +      -       -      +
   1007A  TYR*     3.5     4.9    +      -       -      +
   1008A  VAL*     3.2    19.8    +      -       -      -
   1013A  GLN*     4.8     9.0    -      -       +      +
   1016A  TYR*     3.8    21.0    -      -       +      +
   1017A  LYS*     4.5     7.6    -      -       +      +
   1020A  MET*     4.4    11.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN1005 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    947A  PRO*     3.9    27.5    -      -       +      +
    950A  TYR*     3.3     9.7    +      -       +      +
    951A  VAL*     4.0    23.5    -      -       +      +
   1001A  MET*     3.2    21.0    +      -       -      +
   1002A  LYS*     3.1    22.1    +      -       -      +
   1003A  LEU      3.0     1.6    +      -       -      -
   1004A  ALA*     1.3    73.3    -      -       -      +
   1006A  GLN*     1.3    66.2    +      -       -      +
   1007A  TYR      3.3     0.3    +      -       -      -
   1008A  VAL*     3.3    20.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN1006 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1002A  LYS*     3.0     9.6    +      -       -      +
   1003A  LEU*     2.9    31.4    +      -       -      +
   1005A  GLN*     1.3    76.5    -      -       -      +
   1007A  TYR*     1.3    89.2    +      -       +      +
   1008A  VAL*     3.7     2.3    +      -       -      +
   1010A  THR*     5.2     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR1007 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1003A  LEU*     3.1    34.8    +      -       +      +
   1004A  ALA      3.6     5.6    -      -       -      +
   1005A  GLN      3.2     0.2    -      -       -      -
   1006A  GLN*     1.3   102.2    +      -       +      +
   1008A  VAL*     1.3    64.0    +      -       -      +
   1009A  MET      3.5     0.2    +      -       -      -
   1010A  THR*     3.1    39.3    +      -       +      +
   1012A  LEU*     4.5    18.8    -      -       +      -
   1013A  GLN*     3.5    11.7    -      -       -      +
   1016A  TYR*     3.2    42.9    +      +       +      -
----------------------------------------------------------
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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