Contacts of the helix formed by residues 85 - 109 (chain X) in PDB entry 1V7M


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 CYS 85 (chain X).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25X  ARG      5.5     0.7    -      -       -      -
     28X  GLN*     4.2    12.3    -      -       -      -
     29X  CYS*     2.1    57.9    -      -       +      -
     30X  PRO*     4.6     8.3    -      -       +      -
     84X  THR*     1.3    79.0    -      -       -      +
     86X  LEU*     1.3    62.4    +      -       -      +
     87X  SER      3.2     1.6    -      -       -      -
     88X  SER*     2.7    28.7    +      -       -      -
     89X  LEU*     3.0     9.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 86 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26X  LEU*     4.7    15.3    -      -       +      -
     29X  CYS*     3.5    11.2    -      -       -      -
     31X  GLU      5.0     3.6    -      -       -      +
     32X  VAL*     4.6    19.1    -      -       +      -
     33X  HIS*     4.7     8.7    -      -       +      +
     35X  LEU*     4.9     5.4    -      -       +      -
     81X  LEU*     4.0    19.1    -      -       +      -
     84X  THR*     3.7     4.9    +      -       -      +
     85X  CYS*     1.3    79.5    -      -       -      +
     87X  SER*     1.3    51.4    +      -       -      +
     89X  LEU*     2.9     8.2    +      -       +      +
     90X  LEU*     2.8    59.8    +      -       +      -
    124X  PRO*     3.9    32.3    -      -       +      -
    128X  PHE*     5.7     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 87 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78X  ARG*     2.6    61.8    +      -       -      +
     81X  LEU*     3.9    13.2    +      -       -      -
     82X  GLY      3.4    25.3    +      -       -      -
     83X  PRO*     5.0     2.2    -      -       -      +
     84X  THR*     3.6     7.8    +      -       -      -
     85X  CYS      3.2     0.4    -      -       -      -
     86X  LEU*     1.3    77.1    -      -       -      +
     88X  SER*     1.3    68.8    +      -       -      +
     90X  LEU*     4.2     7.2    -      -       -      -
     91X  GLY      3.3     5.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 88 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78X  ARG*     4.7     2.6    +      -       -      +
     83X  PRO*     5.3     0.6    -      -       -      +
     84X  THR      3.6    16.6    +      -       -      -
     85X  CYS*     2.7    24.2    +      -       -      -
     87X  SER*     1.3    81.3    -      -       -      +
     89X  LEU*     1.3    66.0    +      -       -      +
     91X  GLY*     3.3     6.2    +      -       -      -
     92X  GLN*     2.4    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 89 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22X  LEU*     3.4    39.6    -      -       +      +
     25X  ARG*     3.6    19.3    -      -       +      +
     26X  LEU*     3.6    32.3    -      -       +      +
     29X  CYS*     5.8     2.7    -      -       -      -
     85X  CYS*     3.0     8.2    +      -       -      +
     86X  LEU*     2.9     9.9    +      -       +      +
     88X  SER*     1.3    82.0    +      -       -      +
     90X  LEU*     1.3    67.2    +      -       -      +
     91X  GLY      3.2     2.0    -      -       -      -
     92X  GLN*     3.2    33.5    +      -       -      +
     93X  LEU*     3.3    12.8    +      -       -      +
    128X  PHE*     4.3    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 90 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35X  LEU*     5.8     0.4    -      -       +      -
     74X  VAL*     3.6    10.3    -      -       +      +
     77X  ALA*     3.7    29.8    -      -       +      -
     78X  ARG*     4.0    22.4    +      -       +      +
     81X  LEU*     5.2     2.5    -      -       +      -
     86X  LEU*     2.8    37.2    +      -       +      +
     87X  SER*     4.1     3.1    -      -       -      +
     88X  SER      3.4     0.2    -      -       -      -
     89X  LEU*     1.3    77.1    -      -       -      +
     91X  GLY*     1.3    54.8    +      -       -      +
     92X  GLN      3.3     0.4    -      -       -      -
     93X  LEU*     3.5     7.2    -      -       +      +
     94X  SER*     3.2    26.9    +      -       -      -
    124X  PRO*     5.0     4.0    -      -       +      +
    127X  ILE*     3.2    33.9    -      -       +      -
    128X  PHE*     3.6    24.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 91 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     78X  ARG*     3.3    30.5    -      -       -      +
     87X  SER      3.3     9.5    +      -       -      -
     88X  SER      3.3     2.7    +      -       -      -
     89X  LEU      3.2     0.8    -      -       -      -
     90X  LEU*     1.3    72.7    -      -       -      +
     92X  GLN*     1.3    63.9    +      -       -      +
     94X  SER*     3.0    18.5    +      -       -      -
     95X  GLY*     3.4     7.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 92 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22X  LEU*     3.6    35.1    -      -       +      +
     88X  SER*     2.4    31.7    +      -       -      +
     89X  LEU*     3.2    27.4    +      -       -      +
     91X  GLY*     1.3    77.5    -      -       -      +
     93X  LEU*     1.3    59.4    +      -       -      +
     95X  GLY*     3.2     4.8    +      -       -      +
     96X  GLN*     3.0    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 93 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19X  SER*     5.5     5.4    -      -       -      +
     22X  LEU*     3.9     9.8    -      -       +      +
     70X  LEU*     5.2     0.7    -      -       +      -
     74X  VAL*     4.1    17.9    -      -       +      -
     89X  LEU      3.3     9.3    +      -       -      +
     90X  LEU*     3.5    11.0    -      -       -      +
     92X  GLN*     1.3    74.0    -      -       -      +
     94X  SER*     1.3    57.0    +      -       -      +
     96X  GLN*     2.6    31.9    +      -       +      +
     97X  VAL*     2.9    18.0    +      -       +      +
    127X  ILE*     3.4    42.2    -      -       +      +
    128X  PHE*     3.9    31.2    -      -       +      +
    131X  PHE*     3.7    33.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 94 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71X  LEU*     4.6     2.5    -      -       -      -
     74X  VAL*     4.0    17.0    -      -       -      +
     75X  MET*     4.6    10.9    -      -       -      -
     78X  ARG*     4.7     2.6    +      -       -      -
     90X  LEU      3.2    10.1    +      -       -      -
     91X  GLY*     3.0    21.7    +      -       -      -
     93X  LEU*     1.3    77.4    -      -       -      +
     95X  GLY*     1.3    65.2    +      -       -      -
     97X  VAL*     3.1    11.6    +      -       -      +
     98X  ARG*     3.0    49.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 95 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91X  GLY      3.4     8.6    +      -       -      -
     92X  GLN*     3.2     8.9    +      -       -      -
     93X  LEU      3.0     2.0    +      -       -      -
     94X  SER*     1.3    82.6    +      -       -      +
     96X  GLN*     1.3    61.9    +      -       -      +
     98X  ARG*     3.5    17.3    +      -       -      +
     99X  LEU*     3.5    20.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 96 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14X  LYS*     6.3     1.3    -      -       -      -
     15X  LEU*     3.8    22.6    -      -       +      +
     18X  ASP*     3.1    31.1    +      -       -      +
     19X  SER*     3.1    32.1    +      -       -      -
     22X  LEU*     3.4    25.3    -      -       -      +
     92X  GLN      3.0     7.6    +      -       -      +
     93X  LEU*     2.6    19.5    +      -       -      +
     95X  GLY*     1.3    73.1    -      -       -      -
     97X  VAL*     1.3    58.3    +      -       -      +
     99X  LEU*     3.3    22.9    +      -       +      +
    100X  LEU*     3.8     2.9    +      -       -      +
    131X  PHE*     4.2    20.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 97 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67X  VAL*     3.8    18.8    -      -       +      -
     70X  LEU*     3.5    36.1    -      -       +      -
     71X  LEU*     3.8    24.9    -      -       +      -
     74X  VAL*     4.9     3.1    -      -       +      -
     93X  LEU*     2.9    28.7    +      -       +      +
     94X  SER*     3.1     8.7    +      -       -      +
     96X  GLN*     1.3    71.9    -      -       -      +
     98X  ARG*     1.3    55.4    +      -       -      +
     99X  LEU      3.0     5.4    -      -       -      -
    100X  LEU*     2.9    19.9    +      -       -      +
    101X  LEU*     2.9    12.4    +      -       +      +
    131X  PHE*     4.2    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 98 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28I  THR*     3.8    11.1    +      -       -      +
     30I  SER*     5.8     1.4    +      -       -      -
     31I  ASP*     3.1    39.3    +      -       -      +
     55I  VAL*     3.2    26.3    -      -       +      +
     71X  LEU*     3.2    25.1    -      -       +      +
     75X  MET*     3.6    24.4    -      -       -      +
     94X  SER*     3.0    38.2    +      -       -      +
     95X  GLY*     3.7    12.6    -      -       -      +
     96X  GLN      3.4     0.6    -      -       -      -
     97X  VAL*     1.3    74.2    -      -       -      +
     99X  LEU*     1.3    58.8    +      -       +      +
    100X  LEU      3.4     0.2    -      -       -      -
    101X  LEU*     3.9    12.0    -      -       +      +
    102X  GLY      3.1    19.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 99 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55I  VAL*     5.0     8.7    -      -       +      -
     11X  VAL*     6.0     0.7    -      -       -      +
     15X  LEU*     4.5    18.6    -      -       +      -
     95X  GLY      3.5    20.6    -      -       -      +
     96X  GLN*     3.3    13.4    +      -       +      +
     97X  VAL      3.0     0.8    -      -       -      -
     98X  ARG*     1.3    80.2    -      -       +      +
    100X  LEU*     1.3    62.4    +      -       -      +
    102X  GLY*     3.7     1.7    +      -       -      -
    103X  ALA*     3.3    21.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 100 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11X  VAL*     5.4     2.5    -      -       +      -
     15X  LEU*     4.3    24.1    -      -       +      +
     67X  VAL*     3.2    37.0    -      -       +      -
     96X  GLN      3.8     3.0    +      -       -      +
     97X  VAL*     2.9    11.9    +      -       -      +
     99X  LEU*     1.3    75.2    -      -       -      +
    101X  LEU*     1.3    69.0    -      -       -      +
    103X  ALA*     3.1     8.7    +      -       +      +
    104X  LEU*     3.1    43.3    +      -       +      +
    131X  PHE*     4.5    14.1    -      -       +      -
    134X  LEU*     5.6     2.2    -      -       +      -
    135X  LEU*     4.3     9.9    -      -       +      -
    139X  VAL*     4.4    25.6    -      -       +      -
    143X  MET*     5.0     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 101 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31I  ASP*     4.8    13.9    -      -       -      +
     55I  VAL*     5.6     5.6    -      -       +      -
    101I  TRP*     4.7     9.6    -      -       +      -
     64X  LEU*     4.1     3.1    -      -       +      -
     67X  VAL*     4.1    14.2    -      -       +      +
     68X  THR*     3.0    44.9    -      -       +      -
     71X  LEU*     4.7    19.3    -      -       +      -
     97X  VAL*     2.9    14.9    +      -       +      +
     98X  ARG*     4.0    12.1    -      -       +      +
    100X  LEU*     1.3    76.9    -      -       -      +
    102X  GLY*     1.3    64.1    +      -       -      +
    104X  LEU*     3.5     4.1    +      -       -      +
    105X  GLN*     2.9    60.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 102 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55I  VAL*     4.3    14.1    -      -       -      -
     56I  ASN*     3.1    21.2    -      -       -      +
     98X  ARG      3.1    18.9    +      -       -      -
     99X  LEU*     3.9     2.5    -      -       -      -
    100X  LEU      3.3     0.2    -      -       -      -
    101X  LEU*     1.3    76.8    -      -       -      +
    103X  ALA*     1.3    55.5    +      -       -      +
    105X  GLN*     4.3     4.3    -      -       -      -
    106X  SER*     3.1    26.2    +      -       -      -
    151X  CYS      5.3     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 103 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11X  VAL*     5.1    11.0    -      -       +      -
     99X  LEU      3.3    13.1    +      -       -      +
    100X  LEU*     3.1    15.7    +      -       +      +
    102X  GLY*     1.3    71.2    -      -       -      +
    104X  LEU*     1.3    68.2    +      -       +      +
    106X  SER*     3.3     4.5    +      -       -      -
    107X  LEU*     2.9    24.9    +      -       -      +
    150X  LEU*     5.1    12.1    -      -       +      -
    151X  CYS*     4.3    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 104 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60X  ALA*     4.4    23.8    -      -       +      +
     63X  ILE*     3.3    32.5    -      -       +      -
     64X  LEU*     3.7    28.7    -      -       +      -
     67X  VAL*     3.7    15.9    -      -       +      -
    100X  LEU*     3.1    27.8    +      -       +      +
    101X  LEU      3.7     2.5    -      -       -      +
    103X  ALA*     1.3    77.0    -      -       +      +
    105X  GLN*     1.3    57.8    +      -       -      +
    107X  LEU*     3.0    11.8    +      -       +      +
    108X  LEU*     2.9    34.5    +      -       +      +
    142X  LEU*     5.1    10.8    -      -       +      -
    150X  LEU*     6.1     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 105 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31I  ASP      5.1     0.5    -      -       -      +
     33I  TRP*     3.6    17.5    +      -       +      -
     53I  SER*     4.6     1.2    +      -       -      -
     55I  VAL*     5.8     0.3    -      -       -      +
     56I  ASN*     3.0    21.4    +      -       -      +
    101I  TRP*     4.3     0.2    -      -       -      -
     64X  LEU*     3.6    16.6    -      -       +      +
     68X  THR*     4.3     2.4    -      -       -      +
    101X  LEU*     2.9    60.6    +      -       -      +
    102X  GLY      3.9     3.1    +      -       -      +
    104X  LEU*     1.3    73.3    -      -       -      +
    106X  SER*     1.3    52.4    +      -       -      +
    108X  LEU      4.6     0.2    -      -       -      +
    109X  GLY*     2.8    29.6    +      -       -      -
    110X  THR      3.5    25.5    +      -       -      +
    111X  GLN*     2.8    35.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 106 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52I  ARG*     4.7    14.4    +      -       -      +
     56I  ASN*     3.9    10.3    +      -       -      -
    102X  GLY      3.1    19.1    +      -       -      -
    103X  ALA*     3.7     5.6    -      -       -      -
    104X  LEU      3.2     0.2    -      -       -      -
    105X  GLN*     1.3    74.1    -      -       -      +
    107X  LEU*     1.3    67.8    +      -       -      +
    108X  LEU      3.4     0.2    +      -       -      -
    109X  GLY*     3.5     8.7    +      -       -      -
    151X  CYS      5.4     8.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 107 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57X  GLU*     6.5     0.4    -      -       +      -
     60X  ALA*     4.3    24.5    -      -       +      -
    103X  ALA      2.9    14.3    +      -       -      +
    104X  LEU*     3.5    12.6    -      -       +      +
    106X  SER*     1.3    76.8    +      -       -      +
    108X  LEU*     1.3    68.0    +      -       +      +
    109X  GLY      3.8     0.2    +      -       -      -
    142X  LEU*     5.1    10.3    -      -       +      -
    147X  GLY*     5.3     9.9    -      -       -      -
    148X  SER*     3.4    39.5    -      -       -      +
    149X  THR      4.8     4.9    -      -       -      +
    150X  LEU*     5.9     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 108 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90M  ARG      5.2     4.3    -      -       -      +
     57X  GLU*     4.0    44.7    -      -       +      +
     60X  ALA*     4.0    15.9    -      -       +      +
     61X  GLN*     3.8    34.8    -      -       +      +
     64X  LEU*     3.7    26.9    -      -       +      -
    104X  LEU*     2.9    17.5    +      -       +      +
    105X  GLN      4.2     2.0    -      -       -      +
    107X  LEU*     1.3    89.2    -      -       +      +
    109X  GLY*     1.3    60.5    +      -       -      +
    110X  THR*     3.1    20.6    +      -       +      +
    112X  LEU*     4.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 109 (chain X). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33I  TRP*     3.6     7.1    -      -       -      -
     52I  ARG*     4.2    13.5    -      -       -      -
     90M  ARG      5.5     1.8    -      -       -      -
     93M  TYR*     3.4    10.3    +      -       -      -
     95M  ARG*     3.2    24.7    +      -       -      -
    105X  GLN      2.8    13.6    +      -       -      -
    106X  SER      3.5     9.0    +      -       -      -
    107X  LEU      3.8     0.2    +      -       -      -
    108X  LEU*     1.3    74.5    -      -       -      +
    110X  THR*     1.3    62.0    +      -       -      +
----------------------------------------------------------
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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