Contacts of the helix formed by residues 1020 - 1047 (chain E) in PDB entry 3U5P


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 ILE1020 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    958E  LEU*     3.4     6.0    -      -       -      +
    959E  SER*     6.4     0.7    -      -       -      -
    962E  ASP*     4.7     6.5    -      -       -      +
   1018E  TYR*     3.3     5.8    -      -       -      +
   1019E  GLN*     1.3    86.0    -      -       +      +
   1021E  PRO*     1.4    73.2    -      -       +      +
   1022E  ASP*     2.9    35.2    -      -       +      +
   1023E  ASP*     2.8    58.4    +      -       -      +
   1024E  PHE*     3.3     4.9    +      -       -      +
   1084E  ARG*     5.3     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO1021 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    958E  LEU*     4.0     8.1    -      -       +      -
    959E  SER      6.0     0.4    -      -       -      +
    962E  ASP*     3.3    38.8    -      -       +      +
    966E  CYS*     4.6     7.2    -      -       -      -
   1020E  ILE*     1.4    97.8    -      -       +      +
   1022E  ASP*     1.3    64.6    +      -       -      +
   1023E  ASP      3.1     1.1    -      -       -      -
   1024E  PHE*     3.9     9.8    -      -       +      +
   1025E  VAL*     3.2    18.0    +      -       -      +
   1081E  TYR*     3.5    16.4    -      -       +      +
   1084E  ARG*     4.8     4.0    -      -       -      +
   1086E  PHE*     3.1    32.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP1022 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1020E  ILE*     2.9    32.0    -      -       +      +
   1021E  PRO*     1.3    76.7    -      -       -      +
   1023E  ASP*     1.3    59.6    +      -       -      +
   1025E  VAL*     4.0     2.3    -      -       -      +
   1026E  ALA*     3.2    27.4    +      -       -      +
   1084E  ARG*     2.7    38.2    +      -       -      -
   1086E  PHE*     3.7    11.3    -      -       +      +
   1087E  ALA*     4.9    12.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP1023 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1018E  TYR*     3.9    25.9    -      -       +      -
   1019E  GLN*     4.2     7.6    +      -       -      +
   1020E  ILE*     2.8    40.6    +      -       -      +
   1022E  ASP*     1.3    77.7    -      -       -      +
   1024E  PHE*     1.3    66.4    +      -       -      +
   1026E  ALA*     3.4     6.8    +      -       -      +
   1027E  ASP*     3.2    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE1024 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    958E  LEU*     6.1     0.2    -      -       +      -
    966E  CYS*     3.3    46.9    -      -       +      -
    969E  LEU*     3.5    33.0    -      -       +      -
    970E  LEU*     4.0     6.5    -      -       +      -
    973E  LEU*     6.4     0.2    -      -       +      -
   1006E  VAL*     3.8    13.7    -      -       +      -
   1010E  LEU*     3.3    28.5    -      -       +      -
   1018E  TYR*     3.4    35.8    -      +       +      -
   1020E  ILE      3.3     4.3    +      -       -      +
   1021E  PRO*     4.0     6.7    -      -       +      +
   1022E  ASP      3.5     0.2    -      -       -      -
   1023E  ASP*     1.3    77.0    -      -       -      +
   1025E  VAL*     1.3    75.9    +      -       +      +
   1027E  ASP*     2.9    16.8    +      -       -      +
   1028E  VAL*     3.1    29.2    +      -       +      +
   1073E  PHE*     4.6     3.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with VAL1025 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    969E  LEU*     5.0     0.7    -      -       +      -
   1021E  PRO*     3.2    18.4    +      -       +      +
   1022E  ASP      4.1     1.3    -      -       -      +
   1024E  PHE*     1.3    92.3    -      -       +      +
   1026E  ALA*     1.3    60.7    +      -       -      +
   1028E  VAL*     3.8     6.7    +      -       -      +
   1029E  ARG*     3.2    57.6    +      -       +      +
   1073E  PHE*     4.5     4.0    -      -       +      -
   1077E  LEU*     3.5    34.3    -      -       +      -
   1081E  TYR*     5.7     1.1    -      -       +      -
   1086E  PHE*     3.7    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA1026 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1022E  ASP      3.2    17.5    +      -       -      +
   1023E  ASP*     3.7     9.0    -      -       -      +
   1024E  PHE      3.0     1.2    +      -       -      -
   1025E  VAL*     1.3    74.8    -      -       -      +
   1027E  ASP*     1.3    67.6    +      -       -      +
   1029E  ARG*     3.2    10.5    +      -       -      +
   1030E  LEU*     3.0    20.9    +      -       -      +
   1033E  LYS*     5.3     1.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP1027 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    999E  LYS*     4.8     6.2    +      -       -      -
   1001E  MET*     3.6    20.1    -      -       +      +
   1006E  VAL*     4.1     5.4    -      -       +      -
   1009E  LYS*     2.7    35.5    +      -       -      -
   1018E  TYR*     2.9    31.5    +      -       -      +
   1023E  ASP      3.2     6.0    +      -       -      +
   1024E  PHE      2.9     5.6    +      -       -      +
   1026E  ALA*     1.3    77.4    -      -       -      +
   1028E  VAL*     1.3    59.5    +      -       -      +
   1030E  LEU*     2.6    39.5    +      -       -      +
   1031E  ILE*     3.1     9.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL1028 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    970E  LEU*     5.7     0.7    -      -       +      -
    973E  LEU*     3.8    27.1    -      -       +      -
   1003E  LEU*     5.6     1.6    -      -       +      -
   1006E  VAL*     4.8    11.0    -      -       +      -
   1024E  PHE*     3.1    44.3    +      -       +      +
   1025E  VAL      4.1     2.0    -      -       -      +
   1027E  ASP*     1.3    77.2    -      -       -      +
   1029E  ARG*     1.3    60.3    +      -       -      +
   1030E  LEU      3.4     0.3    +      -       -      -
   1031E  ILE*     3.4    18.2    -      -       +      +
   1032E  PHE*     3.1    24.5    -      -       +      -
   1073E  PHE*     3.7    34.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG1029 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1025E  VAL*     3.2    35.0    +      -       -      +
   1026E  ALA*     3.2     8.9    +      -       -      +
   1027E  ASP      3.0     0.4    -      -       -      -
   1028E  VAL*     1.3    76.8    -      -       -      +
   1030E  LEU*     1.3    60.3    +      -       -      +
   1031E  ILE      3.2     0.2    -      -       -      -
   1032E  PHE*     3.4     7.4    +      -       +      +
   1033E  LYS*     3.0    52.7    +      -       -      +
   1073E  PHE*     4.5    12.1    -      -       +      -
   1074E  GLU*     2.7    30.4    +      -       -      +
   1077E  LEU*     3.4    19.6    -      -       -      +
   1086E  PHE*     3.5    24.5    +      -       -      +
   1087E  ALA      4.8     4.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU1030 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    999E  LYS*     3.3    63.0    -      -       +      +
   1000E  PRO      4.5     1.3    -      -       -      +
   1001E  MET*     3.7    20.4    -      -       +      -
   1026E  ALA      3.0    12.4    +      -       -      +
   1027E  ASP*     2.6    18.6    +      -       -      +
   1029E  ARG*     1.3    76.7    -      -       -      +
   1031E  ILE*     1.3    65.7    +      -       -      +
   1033E  LYS*     3.2    12.7    +      -       +      +
   1034E  ASN*     2.8    40.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE1031 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    982E  PHE*     3.8    34.7    -      -       +      -
   1001E  MET*     3.4    33.9    -      -       +      +
   1002E  ASP*     3.4    30.5    -      -       -      +
   1003E  LEU*     3.6    20.0    -      -       +      +
   1006E  VAL*     4.2    12.1    -      -       +      -
   1027E  ASP      3.1     5.8    +      -       -      +
   1028E  VAL*     3.4    15.3    -      -       +      +
   1030E  LEU*     1.3    79.1    -      -       -      +
   1032E  PHE*     1.3    64.9    +      -       +      +
   1034E  ASN*     3.4     5.6    +      -       -      +
   1035E  CYS*     3.2    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE1032 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    973E  LEU*     4.5     8.3    -      -       +      -
    982E  PHE*     3.9    35.7    -      +       +      -
   1003E  LEU*     5.4     4.3    -      -       +      -
   1028E  VAL*     3.1    41.3    -      -       +      -
   1029E  ARG*     3.4     7.3    +      -       -      +
   1030E  LEU      3.2     0.4    -      -       -      -
   1031E  ILE*     1.3    85.0    -      -       +      +
   1033E  LYS*     1.3    63.3    +      -       -      +
   1035E  CYS*     3.6     4.4    -      -       -      +
   1036E  GLU*     3.1    24.7    +      -       -      +
   1066E  GLY*     3.8    15.8    -      -       -      +
   1069E  VAL*     3.3    38.4    -      -       +      -
   1070E  ALA*     3.6    34.8    -      -       +      -
   1073E  PHE*     5.0     2.7    -      +       +      -
----------------------------------------------------------
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Residues in contact with LYS1033 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1026E  ALA*     5.3     1.8    +      -       -      +
   1029E  ARG*     3.0    44.4    +      -       -      +
   1030E  LEU*     3.7    12.3    -      -       +      +
   1032E  PHE*     1.3    72.6    -      -       -      +
   1034E  ASN*     1.3    69.4    +      -       -      +
   1036E  GLU*     3.0    13.9    +      -       -      +
   1037E  ARG*     2.8    27.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN1034 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    993E  TYR*     4.0    15.3    +      -       -      +
    997E  ILE*     3.6    28.6    -      -       +      +
    999E  LYS*     3.1    24.3    +      -       -      +
   1000E  PRO*     3.6    14.3    -      -       -      +
   1001E  MET*     3.7     9.2    +      -       -      +
   1030E  LEU*     2.8    33.8    +      -       -      +
   1031E  ILE*     3.5     5.8    -      -       -      +
   1033E  LYS*     1.3    76.6    -      -       -      +
   1035E  CYS*     1.3    58.1    +      -       -      +
   1037E  ARG*     3.6     2.5    -      -       -      +
   1038E  PHE*     2.8    33.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS1035 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    982E  PHE*     3.6    30.7    -      -       +      -
    993E  TYR*     5.4     0.4    -      -       -      -
   1031E  ILE      3.2    13.7    +      -       -      +
   1032E  PHE*     3.6     9.4    -      -       -      +
   1034E  ASN*     1.3    79.1    -      -       -      +
   1036E  GLU*     1.3    63.5    +      -       -      +
   1038E  PHE*     3.4     2.3    +      -       -      +
   1039E  ASN*     3.3    22.3    +      -       -      +
   1062E  VAL*     3.7    19.7    -      -       -      -
   1063E  ALA*     3.9    12.3    -      -       -      -
   1066E  GLY*     4.2     6.7    -      -       -      -
     18M  ALY      3.8    22.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU1036 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1032E  PHE      3.1    13.4    +      -       -      +
   1033E  LYS*     3.0    11.7    +      -       -      +
   1035E  CYS*     1.3    78.6    -      -       -      +
   1037E  ARG*     1.3    74.5    +      -       -      +
   1039E  ASN*     3.4     7.7    +      -       -      +
   1040E  GLU*     2.8    37.9    +      -       +      +
   1063E  ALA*     5.4     4.7    -      -       -      +
   1067E  LYS*     6.5     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG1037 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    996E  ILE*     4.6     4.4    -      -       +      +
    997E  ILE*     4.0    16.4    -      -       +      -
   1033E  LYS*     2.8    18.7    +      -       +      +
   1034E  ASN*     3.6     6.1    -      -       -      +
   1036E  GLU*     1.3    93.0    +      -       -      +
   1038E  PHE*     1.3    62.2    +      -       -      +
   1040E  GLU*     3.2    29.8    +      -       -      +
   1041E  MET*     3.0    43.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE1038 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    990E  ILE*     3.9    25.8    -      -       +      -
    991E  PRO      3.9     5.6    -      -       -      -
    992E  ASN      4.1     0.7    -      -       -      -
    993E  TYR*     3.5    50.9    -      +       +      -
    996E  ILE*     4.0    29.6    -      -       +      -
    997E  ILE*     4.3     4.9    -      -       +      -
   1034E  ASN      2.8    17.7    +      -       -      +
   1035E  CYS      4.0     3.8    -      -       -      +
   1036E  GLU      3.2     0.2    -      -       -      -
   1037E  ARG*     1.3    77.4    -      -       -      +
   1039E  ASN*     1.3    59.2    +      -       +      +
   1041E  MET*     3.1     2.9    +      -       -      -
   1042E  MET*     2.9    62.8    +      -       +      +
     18M  ALY      4.4    16.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN1039 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1035E  CYS      3.3     7.5    +      -       -      +
   1036E  GLU*     3.7     7.7    +      -       -      +
   1038E  PHE*     1.3    78.6    -      -       +      +
   1040E  GLU*     1.3    65.2    +      -       -      +
   1042E  MET*     3.9     8.5    -      -       -      +
   1043E  LYS*     3.2    52.1    +      -       -      +
   1060E  SER*     3.3    29.4    +      -       -      +
   1063E  ALA*     3.4    33.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU1040 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1036E  GLU*     2.8    27.3    +      -       +      +
   1037E  ARG*     3.4    37.7    +      -       -      +
   1039E  ASN*     1.3    80.2    +      -       -      +
   1041E  MET*     1.3    62.9    +      -       +      +
   1043E  LYS*     2.3    48.8    +      -       -      +
   1044E  VAL*     3.4    12.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET1041 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    996E  ILE*     3.4    37.7    -      -       +      -
   1037E  ARG*     3.0    46.0    +      -       +      +
   1038E  PHE      3.1     3.8    +      -       -      +
   1040E  GLU*     1.3    74.1    -      -       -      +
   1042E  MET*     1.3    60.2    +      -       -      +
   1044E  VAL*     2.7    40.2    +      -       +      +
   1045E  VAL*     2.9    19.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET1042 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    991E  PRO*     4.9     3.4    -      -       +      +
    992E  ASN*     4.8    12.8    -      -       -      +
    996E  ILE*     4.6     7.2    -      -       -      -
   1038E  PHE*     2.9    55.8    +      -       +      +
   1039E  ASN*     3.9    10.8    -      -       -      +
   1041E  MET*     1.3    74.8    -      -       -      +
   1043E  LYS*     1.3    52.7    +      -       +      +
   1045E  VAL*     3.7    23.2    -      -       +      +
   1046E  GLN*     2.8    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS1043 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1039E  ASN*     3.2    37.9    +      -       -      +
   1040E  GLU*     2.3    46.4    +      -       -      +
   1041E  MET      3.0     0.8    -      -       -      -
   1042E  MET*     1.3    76.8    -      -       +      +
   1044E  VAL*     1.3    62.6    +      -       +      +
   1046E  GLN*     3.5    10.3    +      -       +      +
   1047E  VAL*     3.4    17.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL1044 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1040E  GLU*     3.7    13.5    -      -       -      +
   1041E  MET*     2.7    28.2    +      -       +      +
   1043E  LYS*     1.3    73.9    -      -       +      +
   1045E  VAL*     1.3    60.1    +      -       +      +
   1047E  VAL*     3.0    33.4    -      -       +      +
   1048E  TYR*     3.8     9.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL1045 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    992E  ASN*     4.6    16.2    -      -       -      +
    996E  ILE*     4.9     6.1    -      -       +      -
   1041E  MET*     2.9    29.3    +      -       +      +
   1042E  MET*     3.7    28.5    -      -       +      +
   1044E  VAL*     1.3    74.6    -      -       +      +
   1046E  GLN*     1.3    62.5    +      -       -      +
   1048E  TYR*     3.4    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN1046 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1042E  MET*     2.8    23.3    +      -       +      +
   1043E  LYS*     3.6    11.0    -      -       +      +
   1044E  VAL      3.2     0.2    -      -       -      -
   1045E  VAL*     1.3    74.4    -      -       -      +
   1047E  VAL*     1.3    56.1    +      -       -      +
   1048E  TYR*     2.8    19.7    +      -       -      +
   1049E  ALA*     4.2    12.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL1047 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1043E  LYS      3.4     9.5    +      -       -      +
   1044E  VAL*     3.0    26.7    +      -       +      +
   1046E  GLN*     1.3    75.1    -      -       -      +
   1048E  TYR*     1.3    83.4    +      -       +      +
   1049E  ALA      4.0     2.1    +      -       -      -
----------------------------------------------------------
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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