Contacts of the helix formed by residues 109 - 139 (chain X) in PDB entry 2DE0


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLY 109 (chain X).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108X  LEU*     1.3    77.6    -      -       -      +
    110X  LYS*     1.3    71.4    +      -       -      +
    111X  ASP      3.4     1.3    -      -       -      -
    112X  HIS*     3.3     4.5    +      -       -      +
    113X  GLU*     3.3    23.9    +      -       -      +
    174X  ASP*     3.3    36.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 110 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108X  LEU      3.8     1.6    +      -       -      -
    109X  GLY*     1.3    75.3    -      -       -      +
    111X  ASP*     1.3    74.4    +      -       -      +
    112X  HIS      3.1     0.2    +      -       -      -
    113X  GLU*     3.1     4.0    +      -       -      +
    114X  ILE*     3.1    42.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 111 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109X  GLY      3.4     0.2    -      -       -      -
    110X  LYS*     1.3    89.3    +      -       -      +
    112X  HIS*     1.3    62.2    +      -       -      +
    114X  ILE*     3.8    12.4    -      -       -      +
    115X  LEU*     2.9    33.8    +      -       +      +
    173X  THR*     3.2    29.9    -      -       +      +
    174X  ASP*     5.4     1.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 112 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108X  LEU*     4.2    10.1    -      -       +      +
    109X  GLY*     3.3    12.6    +      -       -      +
    110X  LYS      3.1     0.6    +      -       -      -
    111X  ASP*     1.3    79.1    -      -       -      +
    113X  GLU*     1.3    76.8    +      -       -      +
    116X  ARG*     2.7    47.9    +      -       +      +
    170X  LEU*     3.4    37.9    -      -       +      +
    173X  THR*     3.8    19.1    +      -       -      +
    174X  ASP*     4.0    21.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 113 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108X  LEU*     3.1    39.3    -      -       +      +
    109X  GLY      3.3    14.4    -      -       -      +
    110X  LYS*     3.1     6.6    +      -       -      +
    112X  HIS*     1.3    95.0    +      -       -      +
    114X  ILE*     1.3    68.1    +      -       +      +
    116X  ARG*     3.2    32.9    +      -       -      +
    117X  ARG*     3.0    49.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 114 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110X  LYS*     3.1    39.8    +      -       +      +
    111X  ASP*     3.8    14.8    -      -       -      +
    113X  GLU*     1.3    78.3    -      -       +      +
    115X  LEU*     1.3    55.0    +      -       +      +
    117X  ARG*     3.1    19.5    +      -       -      +
    118X  ARG*     2.8    59.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 115 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111X  ASP*     2.9    29.1    +      -       +      +
    112X  HIS      3.7     2.9    -      -       -      +
    114X  ILE*     1.3    73.3    -      -       +      +
    116X  ARG*     1.3    65.8    +      -       -      +
    117X  ARG      3.1     0.2    +      -       -      -
    118X  ARG*     3.1    20.4    +      -       -      +
    119X  ILE*     2.8    30.1    +      -       +      +
    166X  ASP*     4.0    26.0    -      -       -      +
    169X  TYR*     3.6    45.1    -      -       +      +
    170X  LEU*     3.8    16.2    -      -       +      +
    173X  THR*     4.0    17.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 116 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112X  HIS*     2.7    30.2    +      -       +      +
    113X  GLU*     3.2    33.1    +      -       -      +
    114X  ILE      3.3     0.4    -      -       -      -
    115X  LEU*     1.3    76.1    -      -       -      +
    117X  ARG*     1.3    83.1    +      -       -      +
    119X  ILE*     3.2    11.2    +      -       +      +
    120X  GLU*     3.1    49.5    +      -       +      +
    170X  LEU*     4.2    11.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 117 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113X  GLU*     3.0    45.8    +      -       -      +
    114X  ILE*     3.7    24.6    -      -       -      +
    116X  ARG*     1.3    93.5    -      -       -      +
    118X  ARG*     1.3    57.3    +      -       -      +
    120X  GLU*     3.3    12.7    +      -       -      +
    121X  ASN*     2.6    39.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 118 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114X  ILE*     2.8    44.2    +      -       +      +
    115X  LEU*     3.8    17.4    -      -       -      +
    117X  ARG*     1.3    75.6    -      -       -      +
    119X  ILE*     1.3    52.8    +      -       -      +
    121X  ASN*     4.3     4.9    -      -       +      +
    122X  GLY*     2.7    32.6    +      -       -      +
    166X  ASP*     3.1    34.2    +      -       -      +
    169X  TYR*     5.8     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 119 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115X  LEU      2.8    27.4    +      -       -      +
    116X  ARG*     3.5     9.0    -      -       -      +
    118X  ARG*     1.3    75.5    -      -       -      +
    120X  GLU*     1.3    67.4    +      -       -      +
    122X  GLY*     3.2     2.3    +      -       -      -
    123X  ALA*     3.0    24.0    +      -       +      +
    163X  ILE*     4.2    22.8    -      -       +      +
    166X  ASP*     3.5    26.0    -      -       +      +
    167X  LEU*     3.6    47.6    -      -       +      +
    170X  LEU*     4.3    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 120 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116X  ARG*     3.1    35.8    +      -       +      +
    117X  ARG*     3.6    12.2    -      -       -      +
    119X  ILE*     1.3    80.4    -      -       -      +
    121X  ASN*     1.3    61.5    +      -       -      +
    123X  ALA*     3.4     6.1    +      -       -      +
    124X  LYS*     3.2    28.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 121 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117X  ARG*     2.6    22.4    +      -       +      +
    118X  ARG*     4.2     4.7    -      -       +      +
    120X  GLU*     1.3    74.3    -      -       -      +
    122X  GLY*     1.3    57.7    +      -       -      +
    124X  LYS*     3.2    26.4    +      -       -      +
    125X  GLU*     2.9    47.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 122 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118X  ARG*     2.7    25.2    +      -       -      +
    119X  ILE      3.6     1.6    -      -       -      -
    121X  ASN*     1.3    72.8    -      -       -      +
    123X  ALA*     1.3    55.0    +      -       -      +
    125X  GLU*     3.6     2.6    +      -       -      -
    126X  LEU*     3.0    10.2    +      -       -      +
    159X  HIS*     2.8    31.0    +      -       -      -
    162X  SER*     5.9     1.1    -      -       -      -
    163X  ILE*     3.6    14.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 123 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119X  ILE*     3.0    16.9    +      -       +      +
    120X  GLU*     3.9     5.8    -      -       -      +
    121X  ASN      3.3     0.4    -      -       -      -
    122X  GLY*     1.3    73.1    -      -       -      +
    124X  LYS*     1.3    60.2    +      -       -      +
    126X  LEU*     3.7     6.8    -      -       +      +
    127X  TRP*     2.9    27.3    +      -       -      +
    163X  ILE*     3.6    16.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 124 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120X  GLU*     3.2    19.9    +      -       +      +
    121X  ASN*     3.5    26.5    -      -       -      +
    123X  ALA*     1.3    72.5    -      -       -      +
    125X  GLU*     1.3    68.0    +      -       -      +
    127X  TRP*     2.8    12.2    +      -       +      +
    128X  PHE*     2.8    57.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 125 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121X  ASN*     2.9    38.9    +      -       -      +
    122X  GLY*     3.9     5.4    -      -       -      +
    124X  LYS*     1.3    75.9    -      -       -      +
    126X  LEU*     1.3    62.2    +      -       -      +
    128X  PHE*     2.9    32.0    +      -       -      +
    129X  PHE*     2.8    24.4    +      -       -      +
    159X  HIS*     3.8    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 126 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122X  GLY      3.0    19.5    +      -       -      +
    123X  ALA*     3.7     8.7    -      -       +      +
    125X  GLU*     1.3    73.1    -      -       -      +
    127X  TRP*     1.3    57.0    +      -       -      +
    129X  PHE*     3.3     5.1    +      -       +      +
    130X  LEU*     2.8    46.7    +      -       +      +
    156X  LEU*     3.7    34.1    -      -       +      +
    159X  HIS*     3.2    34.9    -      -       +      +
    160X  GLU*     5.0    11.0    -      -       +      +
    163X  ILE*     4.3    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 127 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123X  ALA      2.9    17.7    +      -       -      +
    124X  LYS*     2.8    15.0    +      -       +      +
    126X  LEU*     1.3    73.4    -      -       -      +
    128X  PHE*     1.3    65.6    +      +       -      +
    130X  LEU*     3.7    27.4    -      -       +      -
    131X  GLN*     2.7    71.8    +      -       +      +
    134X  LEU*     6.2     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 128 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121X  ASN*     6.0     0.2    -      -       -      -
    124X  LYS*     2.8    58.2    +      -       +      -
    125X  GLU*     2.9    35.6    +      -       -      +
    127X  TRP*     1.3    77.7    -      +       -      +
    129X  PHE*     1.3    63.9    +      -       -      +
    131X  GLN*     3.3    15.8    +      -       -      +
    132X  SER*     3.0    25.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 129 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125X  GLU      2.8    16.5    +      -       -      +
    126X  LEU*     3.5     7.0    -      -       +      +
    128X  PHE*     1.3    75.5    -      -       -      +
    130X  LEU*     1.3    58.0    +      -       -      +
    132X  SER*     4.4     4.7    -      -       -      -
    133X  GLU*     2.9    67.7    +      -       +      +
    152X  PHE*     3.9    20.6    -      +       -      -
    155X  ASP*     3.9    33.2    -      -       +      -
    156X  LEU*     4.1    21.3    -      -       +      -
    159X  HIS*     4.7    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 130 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126X  LEU*     2.8    38.0    +      -       +      +
    127X  TRP*     3.5    34.3    -      -       +      +
    128X  PHE      3.1     0.2    -      -       -      -
    129X  PHE*     1.3    77.4    -      -       -      +
    131X  GLN*     1.3    59.8    +      -       -      +
    133X  GLU*     3.8     0.7    -      -       -      +
    134X  LEU*     2.9    43.5    +      -       +      +
    152X  PHE*     4.1    13.6    -      -       +      -
    156X  LEU*     3.6    27.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 131 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127X  TRP*     2.7    70.8    +      -       +      +
    128X  PHE*     3.7    16.6    -      -       -      +
    130X  LEU*     1.3    74.6    -      -       -      +
    132X  SER*     1.3    63.9    +      -       -      +
    134X  LEU*     4.0     7.5    -      -       -      +
    135X  LYS*     3.2    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 132 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128X  PHE      3.0    19.9    +      -       -      -
    129X  PHE*     3.7     6.7    -      -       -      -
    131X  GLN*     1.3    76.2    -      -       -      +
    133X  GLU*     1.3    65.1    +      -       -      +
    135X  LYS*     2.8    22.9    +      -       -      +
    136X  LYS*     3.2    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 133 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129X  PHE*     2.9    56.9    +      -       +      +
    132X  SER*     1.3    73.6    -      -       -      +
    134X  LEU*     1.3    61.5    +      -       -      +
    135X  LYS      3.2     0.2    -      -       -      -
    136X  LYS*     3.4    30.2    +      -       -      +
    137X  LEU*     3.1    20.3    +      -       -      +
    148X  HIS*     3.2    32.8    +      -       +      -
    152X  PHE*     3.7    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 134 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127X  TRP*     6.2     3.1    -      -       +      -
    130X  LEU*     2.9    32.1    +      -       +      +
    131X  GLN*     4.1     7.2    -      -       -      +
    133X  GLU*     1.3    78.4    -      -       -      +
    135X  LYS*     1.3    61.6    +      -       -      +
    137X  LEU*     3.4    22.3    +      -       +      +
    138X  LYS*     3.3    19.3    +      -       -      +
    152X  PHE*     3.5    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 135 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131X  GLN      3.2    15.9    +      -       -      +
    132X  SER*     2.8     6.7    +      -       -      +
    134X  LEU*     1.3    76.1    -      -       -      +
    136X  LYS*     1.3    66.7    +      -       -      +
    138X  LYS*     3.5    36.0    +      -       -      +
    139X  ASN*     3.4    18.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 136 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132X  SER*     3.2    20.5    +      -       -      +
    133X  GLU*     3.4    38.9    +      -       -      +
    134X  LEU      3.3     0.2    -      -       -      -
    135X  LYS*     1.3    77.0    -      -       -      +
    137X  LEU*     1.3    62.2    +      -       -      +
    139X  ASN*     3.0    24.3    +      -       -      +
    140X  LEU*     3.3    16.2    -      -       +      +
    148X  HIS*     3.8    13.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 137 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133X  GLU      3.1     8.3    +      -       -      +
    134X  LEU*     3.7    26.5    -      -       +      +
    135X  LYS      3.4     0.4    -      -       -      -
    136X  LYS*     1.3    75.4    -      -       -      +
    138X  LYS*     1.3    61.4    +      -       +      +
    139X  ASN      3.2     0.9    +      -       -      -
    140X  LEU*     3.3    20.1    +      -       +      +
    145X  LEU*     3.4    40.4    -      -       +      +
    148X  HIS*     2.9    33.2    +      -       +      +
    149X  ALA*     4.0    12.8    -      -       +      +
    152X  PHE*     3.6    30.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 138 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134X  LEU      3.3    17.5    -      -       -      +
    135X  LYS*     3.6    34.2    -      -       -      +
    136X  LYS      3.1     0.4    +      -       -      -
    137X  LEU*     1.3    76.4    -      -       +      +
    139X  ASN*     1.3    65.2    +      -       -      +
    140X  LEU      3.4     4.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 139 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135X  LYS*     3.4    21.4    +      -       -      +
    136X  LYS*     3.0    10.4    +      -       -      +
    138X  LYS*     1.3    84.8    -      -       -      +
    140X  LEU*     1.3    71.6    +      -       -      +
    141X  GLU*     5.8     0.9    -      -       -      -
----------------------------------------------------------
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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