Contacts of the helix formed by residues 103 - 128 (chain N) in PDB entry 3V3K


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 103 (chain N).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98N  LEU*     3.9     9.2    -      -       -      +
    101N  GLY      5.9     1.1    -      -       -      -
    102N  MET*     1.3    77.1    -      -       -      +
    104N  ILE*     1.3    65.0    +      -       -      +
    105N  GLU*     3.5    30.3    +      -       -      +
    106N  ASP*     3.1    30.7    +      -       -      +
    107N  ARG      3.7     3.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 104 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25N  THR      5.6     0.2    -      -       -      +
     26N  PRO*     4.6    27.4    -      -       +      +
     98N  LEU*     4.7     4.9    -      -       +      -
    103N  THR*     1.3    72.4    -      -       -      +
    105N  GLU*     1.3    63.9    +      -       +      +
    106N  ASP      3.3     0.2    -      -       -      -
    107N  ARG*     3.2    40.1    +      -       -      +
    108N  ASP*     3.2    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 105 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103N  THR*     3.2    18.6    +      -       -      +
    104N  ILE*     1.3    76.6    -      -       +      +
    106N  ASP*     1.3    62.4    +      -       -      +
    108N  ASP*     3.6     8.5    +      -       -      +
    109N  SER*     3.2    23.9    +      -       -      -
    112N  ARG*     5.1     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 106 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79N  LYS*     4.7     0.2    -      -       -      -
     83N  VAL*     4.0    13.0    -      -       +      +
    101N  GLY      5.1     0.3    -      -       -      +
    102N  MET*     3.6    39.1    -      -       +      +
    103N  THR*     3.1    37.3    +      -       -      +
    104N  ILE      3.3     0.8    -      -       -      -
    105N  GLU*     1.3    74.8    -      -       -      +
    107N  ARG*     1.3    63.5    +      -       -      +
    109N  SER*     2.7    22.3    +      -       -      -
    110N  TYR*     3.4    10.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 107 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25N  THR      3.0    27.9    +      -       -      -
     26N  PRO*     3.4    19.3    +      -       -      +
     27N  GLU      3.6    11.7    -      -       -      +
     28N  SER*     3.6     6.1    +      -       -      +
     29N  VAL*     3.2    27.1    -      -       -      +
     33N  ASN*     4.9     6.3    -      -       -      +
     36N  HIS*     4.3     2.6    +      -       -      -
     83N  VAL*     4.4     2.5    -      -       -      +
     84N  PHE*     3.9    27.0    -      -       +      -
     98N  LEU*     4.2    13.5    -      -       +      -
    103N  THR      3.7     2.4    +      -       -      -
    104N  ILE*     3.2    36.1    +      -       -      +
    106N  ASP*     1.3    78.6    -      -       -      +
    108N  ASP*     1.3    87.2    +      -       -      +
    110N  TYR*     3.3     6.8    +      -       -      +
    111N  ILE*     3.1    33.3    +      -       +      +
    177N  PRO*     4.7     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 108 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33N  ASN*     5.7     0.7    +      -       -      -
     35N  ASN*     4.0    31.8    +      -       +      +
     36N  HIS*     3.1    24.8    +      -       +      +
    104N  ILE*     3.2    21.2    +      -       -      +
    105N  GLU*     4.1     7.2    -      -       -      +
    106N  ASP      3.4     0.4    -      -       -      -
    107N  ARG*     1.3   106.5    +      -       -      +
    109N  SER*     1.3    59.3    +      -       -      +
    111N  ILE*     3.3     7.8    +      -       -      +
    112N  ARG*     2.9    36.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 109 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79N  LYS*     3.3    24.1    +      -       -      -
    105N  GLU      3.2    13.7    +      -       -      -
    106N  ASP*     2.7    30.0    +      -       -      -
    108N  ASP*     1.3    74.1    -      -       -      +
    110N  TYR*     1.3    61.5    +      -       -      +
    112N  ARG*     3.6    29.4    +      -       -      +
    113N  ASP*     3.2    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 110 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76N  LEU*     3.4    55.7    -      -       +      +
     79N  LYS*     3.9    17.0    -      -       +      +
     80N  ARG*     3.7    32.4    -      -       +      -
     83N  VAL*     5.2     0.9    -      -       +      -
     84N  PHE*     3.8    26.2    -      +       +      -
    106N  ASP      3.4     7.4    +      -       -      +
    107N  ARG      3.3     9.5    +      -       -      +
    109N  SER*     1.3    82.8    +      -       -      +
    111N  ILE*     1.3    66.5    +      -       +      +
    113N  ASP*     3.1     5.7    +      -       -      +
    114N  LEU*     2.8    42.0    +      -       +      +
    150N  LEU*     4.7     2.4    -      -       -      +
    153N  ASP*     2.6    29.4    +      -       -      +
    177N  PRO*     4.4     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 111 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29N  VAL*     4.3     0.2    -      -       +      -
     32N  LEU*     4.3     9.0    -      -       +      -
     36N  HIS*     3.2    47.1    -      -       +      +
    107N  ARG*     3.1    37.5    +      -       +      +
    108N  ASP*     3.3     9.2    +      -       -      +
    110N  TYR*     1.3    81.1    -      -       +      +
    112N  ARG*     1.3    56.0    +      -       -      +
    114N  LEU*     3.3     9.0    +      -       +      +
    115N  PHE*     2.8    33.2    +      -       +      +
    157N  MET*     4.8     5.1    -      -       -      +
    176N  VAL*     3.5    33.0    -      -       +      +
    177N  PRO*     4.4     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 112 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35N  ASN      3.2    22.9    +      -       -      +
     36N  HIS      3.8    10.1    +      -       -      +
     37N  PHE      3.5    22.9    -      -       -      +
     38N  LEU*     3.5     8.6    -      -       -      +
     39N  SER*     4.9    16.5    +      -       -      +
     42N  LEU*     4.0    22.5    -      -       +      +
     79N  LYS*     6.0     0.2    -      -       -      +
    105N  GLU      5.1     1.6    +      -       -      -
    108N  ASP*     2.9    18.7    +      -       -      +
    109N  SER*     3.6    30.2    +      -       -      +
    111N  ILE*     1.3    76.5    -      -       -      +
    113N  ASP*     1.3    57.6    +      -       -      +
    115N  PHE*     3.2     4.3    +      -       -      +
    116N  PHE*     3.0    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 113 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42N  LEU*     3.9    18.6    -      -       -      +
     72N  PHE*     3.6    27.4    -      -       +      -
     76N  LEU*     3.5    20.4    -      -       +      +
     79N  LYS*     3.3    25.4    +      -       -      +
    109N  SER      3.2    14.4    +      -       -      +
    110N  TYR      3.1     9.0    +      -       -      +
    112N  ARG*     1.3    77.6    +      -       -      +
    114N  LEU*     1.3    60.3    +      -       -      +
    116N  PHE*     3.5     6.5    -      -       -      +
    117N  LEU*     3.4    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 114 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76N  LEU*     4.4     1.7    -      -       +      +
    110N  TYR*     2.8    33.8    +      -       +      +
    111N  ILE*     3.5    13.9    -      -       +      +
    112N  ARG      3.2     0.2    -      -       -      -
    113N  ASP*     1.3    73.5    -      -       -      +
    115N  PHE*     1.3    63.5    +      -       -      +
    117N  LEU*     3.3    10.9    +      -       +      +
    118N  HIS*     3.2    20.8    +      -       -      +
    150N  LEU*     3.8    23.6    -      -       +      -
    153N  ASP*     3.6    31.2    -      -       +      +
    154N  LEU*     4.3    10.2    -      -       +      +
    157N  MET*     3.4    28.0    -      -       +      -
    176N  VAL      3.4    20.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 115 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32N  LEU*     4.4    13.5    -      -       +      -
     36N  HIS      4.0    17.3    -      -       -      +
     37N  PHE*     4.8    20.0    -      +       -      -
     38N  LEU*     3.6    32.3    -      -       +      -
    111N  ILE*     2.8    20.7    +      -       +      +
    112N  ARG      3.2     6.5    +      -       -      +
    114N  LEU*     1.3    71.0    -      -       -      +
    116N  PHE*     1.3    53.7    +      -       -      +
    118N  HIS*     3.2     4.3    +      -       -      +
    119N  SER*     2.7    51.0    +      -       -      -
    157N  MET*     3.4    34.9    -      -       +      +
    161N  VAL*     4.1    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 116 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38N  LEU*     3.6    10.4    -      -       +      +
     42N  LEU*     3.8    25.8    -      -       +      -
     45N  LYS*     4.1    10.5    -      -       +      -
     46N  LEU*     3.6    36.8    -      -       +      -
     49N  MET*     3.7    19.3    -      -       +      -
     69N  LEU*     4.3    10.5    -      -       +      -
     72N  PHE*     3.6    35.4    -      +       +      -
    112N  ARG      3.0    12.7    +      -       -      +
    113N  ASP*     3.5    11.7    -      -       -      +
    115N  PHE*     1.3    75.0    -      -       -      +
    117N  LEU*     1.3    60.8    +      -       +      +
    119N  SER*     3.1     6.6    +      -       -      -
    120N  LEU*     2.9    62.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 117 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69N  LEU*     4.4     9.0    -      -       +      -
     72N  PHE*     3.9    23.1    -      -       +      -
     73N  VAL*     4.0    15.3    -      -       +      -
     76N  LEU*     4.0    23.3    -      -       +      -
    113N  ASP      3.4    15.4    +      -       -      +
    114N  LEU*     3.3    11.4    +      -       +      +
    115N  PHE      3.3     0.4    -      -       -      -
    116N  PHE*     1.3    78.3    -      -       +      +
    118N  HIS*     1.3    58.1    +      -       -      +
    120N  LEU*     4.0     1.5    -      -       -      -
    121N  LYS*     3.1    28.4    +      -       -      +
    142N  LEU*     3.5    31.3    -      -       +      +
    150N  LEU*     4.1    26.0    -      -       +      -
    154N  LEU*     4.0    13.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 118 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114N  LEU      3.2     8.9    +      -       -      +
    115N  PHE*     3.2     9.0    +      -       -      +
    117N  LEU*     1.3    76.2    -      -       -      +
    119N  SER*     1.3    60.9    +      -       -      +
    121N  LYS*     3.4    13.8    +      -       +      +
    122N  VAL*     3.0    49.1    +      -       +      +
    154N  LEU*     4.2    17.8    -      -       +      +
    157N  MET*     3.8    20.0    -      -       +      +
    158N  LYS*     3.8    34.4    -      -       +      +
    161N  VAL*     3.5    39.2    -      -       +      +
    162N  GLU*     3.8    16.5    +      -       +      -
----------------------------------------------------------
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Residues in contact with SER 119 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38N  LEU*     3.9     2.0    -      -       -      +
     46N  LEU*     3.2    21.0    -      -       -      +
    115N  PHE*     2.7    42.6    +      -       -      -
    116N  PHE*     3.1    13.0    +      -       -      -
    118N  HIS*     1.3    76.3    +      -       -      +
    120N  LEU*     1.3    60.8    +      -       -      +
    122N  VAL*     3.4     9.3    +      -       -      +
    123N  LYS*     3.3    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46N  LEU*     4.1    15.6    -      -       +      +
     49N  MET*     3.7    31.0    -      -       +      -
     50N  VAL*     5.2     6.0    -      -       +      +
     69N  LEU*     4.1    15.5    -      -       +      -
    116N  PHE*     2.9    53.6    +      -       +      +
    117N  LEU*     4.1     3.8    -      -       -      +
    119N  SER*     1.3    73.8    +      -       -      +
    121N  LYS*     1.3    59.7    +      -       -      +
    123N  LYS*     3.7     4.6    +      -       -      +
    124N  ILE*     3.2    57.4    +      -       +      +
    142N  LEU*     3.3    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 121 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117N  LEU      3.1    19.7    +      -       -      +
    118N  HIS*     3.5    13.2    -      -       +      +
    119N  SER      3.3     0.2    -      -       -      -
    120N  LEU*     1.3    74.8    -      -       -      +
    122N  VAL*     1.3    59.5    +      -       +      +
    124N  ILE*     3.4     3.1    +      -       -      +
    125N  GLU*     3.0    51.2    +      -       -      +
    139N  TYR*     4.2     7.6    -      -       +      -
    142N  LEU*     3.4    47.0    +      -       +      +
    143N  CYS*     3.8    19.0    -      -       -      +
    144N  PRO*     5.9     0.4    -      -       -      +
    154N  LEU*     5.6    12.7    -      -       +      +
    158N  LYS*     5.7     8.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 122 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118N  HIS*     3.0    45.2    +      -       +      +
    119N  SER*     3.6     9.6    -      -       -      +
    120N  LEU      3.4     0.4    -      -       -      -
    121N  LYS*     1.3    76.7    -      -       +      +
    123N  LYS*     1.3    59.5    +      -       +      +
    125N  GLU*     3.3    14.2    +      -       -      +
    126N  GLU*     3.0    45.3    +      -       +      +
    162N  GLU*     4.0    12.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 123 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43N  GLN*     4.6     5.7    -      -       -      +
     46N  LEU*     3.2    26.5    -      -       +      +
     47N  ASP*     4.1     8.7    +      -       -      -
     50N  VAL*     3.5    44.2    -      -       +      +
    119N  SER*     3.3    16.3    +      -       -      +
    120N  LEU      4.2     1.6    -      -       -      +
    122N  VAL*     1.3    75.6    -      -       +      +
    124N  ILE*     1.3    60.8    +      -       -      +
    126N  GLU*     3.4    19.4    +      -       -      +
    127N  SER*     3.0    30.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 124 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50N  VAL*     6.1     3.8    -      -       +      -
     53N  TYR*     3.6    42.0    -      -       +      +
     65N  ILE*     6.4     0.2    -      -       +      -
    120N  LEU*     3.2    42.8    +      -       +      +
    121N  LYS*     3.8     4.9    -      -       -      +
    123N  LYS*     1.3    72.6    -      -       +      +
    125N  GLU*     1.3    60.4    +      -       -      +
    127N  SER*     3.3     7.9    +      -       -      -
    128N  ARG*     2.9    30.4    +      -       -      +
    138N  VAL*     4.4    19.5    -      -       +      -
    139N  TYR*     3.6    29.8    -      -       +      -
    142N  LEU*     4.0     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 125 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121N  LYS*     3.0    39.5    +      -       -      +
    122N  VAL*     3.3    13.9    +      -       -      +
    124N  ILE*     1.3    77.6    -      -       -      +
    126N  GLU*     1.3    57.1    +      -       -      +
    128N  ARG*     3.1    26.0    -      -       -      +
    129N  GLN*     4.0     5.5    +      -       -      +
    139N  TYR*     3.1    34.1    +      -       +      +
    158N  LYS*     5.6     5.1    +      -       -      -
    162N  GLU*     5.8     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 126 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122N  VAL*     3.0    36.1    +      -       +      +
    123N  LYS*     3.5    19.7    -      -       -      +
    124N  ILE      3.3     0.2    -      -       -      -
    125N  GLU*     1.3    76.6    -      -       -      +
    127N  SER*     1.3    60.2    -      -       -      +
    129N  GLN*     3.0    39.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 127 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50N  VAL*     4.9     7.1    +      -       -      +
     53N  TYR*     4.2    21.9    -      -       -      -
     54N  SER*     3.9    23.6    -      -       -      -
    123N  LYS      3.0    15.3    +      -       -      -
    124N  ILE      3.3     9.1    +      -       -      -
    126N  GLU*     1.3    79.3    -      -       -      +
    128N  ARG*     1.3    58.2    +      -       -      +
    129N  GLN*     3.2     6.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 128 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53N  TYR*     3.4    25.6    -      -       +      +
    124N  ILE*     2.9    20.5    +      -       -      +
    125N  GLU*     3.1    15.1    -      -       -      +
    126N  GLU      3.5     0.2    -      -       -      -
    127N  SER*     1.3    73.8    -      -       -      +
    129N  GLN*     1.3    59.1    +      -       -      +
    130N  GLY      3.8     0.9    -      -       -      +
    131N  LYS      4.2    13.4    +      -       -      +
    132N  GLU*     2.8    30.9    +      -       -      +
    134N  SER*     3.6    29.5    +      -       -      +
    135N  LYS*     3.9     5.1    -      -       -      +
    136N  CYS*     3.5    15.3    -      -       -      +
    139N  TYR*     3.3    46.0    -      -       -      +
----------------------------------------------------------
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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