Contacts of the helix formed by residues 101 - 128 (chain E) in PDB entry 2YW7


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 101 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155D  HIS      6.1     1.3    -      -       -      +
     42E  VAL*     4.6     0.7    -      -       -      -
     43E  VAL*     3.4    11.0    -      -       +      +
     44E  GLY*     5.9     1.6    -      -       -      -
     45E  PRO*     6.4     1.1    -      -       -      -
    100E  ASP*     1.3    91.3    +      -       -      +
    102E  VAL*     1.3    60.5    +      -       -      +
    103E  GLN*     3.6     9.1    +      -       -      +
    104E  ALA*     3.2    20.6    +      -       -      +
    105E  HIS*     3.0    34.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 102 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42E  VAL*     4.1    16.4    -      -       +      -
     43E  VAL      3.8    13.7    -      -       -      +
     45E  PRO*     4.5    14.4    -      -       +      -
     46E  ASN*     4.8    12.3    -      -       -      +
     47E  PHE*     4.1    17.9    -      -       +      +
     50E  VAL*     3.5    13.7    -      -       +      -
    101E  THR*     1.3    70.1    -      -       -      +
    103E  GLN*     1.3    72.9    +      -       +      +
    104E  ALA      2.9     4.8    +      -       -      -
    105E  HIS      3.3     0.3    +      -       -      -
    106E  LEU*     2.9    62.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 103 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46E  ASN*     5.8     3.6    +      -       -      +
    101E  THR*     3.5     8.6    +      -       -      +
    102E  VAL*     1.3    89.4    -      -       +      +
    104E  ALA*     1.3    56.8    +      -       -      +
    106E  LEU*     4.8     5.8    -      -       -      +
    107E  ALA*     3.1    22.8    -      -       -      +
    154E  ALA      4.9     2.9    +      -       -      +
    155E  HIS*     4.0    23.7    -      -       -      +
     45H  PRO*     5.1    15.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 104 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97E  VAL*     4.0     7.8    -      -       +      +
    100E  ASP*     3.5    31.4    -      -       +      +
    101E  THR*     3.2    22.9    +      -       -      +
    102E  VAL      2.9     0.6    -      -       -      -
    103E  GLN*     1.3    78.0    -      -       -      +
    105E  HIS*     1.3    65.9    +      -       -      +
    107E  ALA*     3.5     4.8    -      -       -      +
    108E  ALA*     3.4    18.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 105 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38E  VAL*     3.7    18.6    -      -       +      +
     41E  ASN*     3.2    23.1    +      -       +      -
     42E  VAL*     3.5    30.3    -      -       +      -
     95E  TYR*     2.9    29.3    +      +       -      +
     97E  VAL*     3.5    24.6    -      -       +      +
     98E  GLU      2.9    29.5    +      -       -      -
    100E  ASP      3.7     4.5    +      -       -      -
    101E  THR      3.0    26.9    +      -       -      +
    102E  VAL      4.2     1.1    -      -       -      +
    104E  ALA*     1.3    73.9    -      -       -      +
    106E  LEU*     1.3    57.8    +      -       +      +
    108E  ALA*     2.8     5.0    +      -       -      -
    109E  LEU*     2.6    36.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 106 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50E  VAL*     4.4     8.5    -      -       +      -
     53E  MET*     3.5    34.3    -      -       +      -
    102E  VAL*     2.9    44.4    +      -       +      +
    103E  GLN*     4.8     4.7    -      -       -      +
    105E  HIS*     1.3    76.6    -      -       -      +
    107E  ALA*     1.3    62.6    +      -       -      +
    109E  LEU*     4.1    16.6    -      -       +      -
    110E  ASP*     3.0    24.1    +      -       -      +
    152E  VAL*     3.5    38.2    -      -       +      +
    154E  ALA*     5.2     9.4    -      -       +      +
    155E  HIS      5.1     9.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 107 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103E  GLN      3.1    25.2    +      -       -      +
    104E  ALA*     3.5     7.8    +      -       -      +
    105E  HIS      3.1     0.4    -      -       -      -
    106E  LEU*     1.3    76.5    -      -       -      +
    108E  ALA*     1.3    62.3    +      -       -      +
    110E  ASP*     3.2    20.0    -      -       -      +
    111E  LEU*     3.6    11.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 108 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95E  TYR*     4.0    11.2    -      -       +      -
     96E  SER*     6.2     1.3    -      -       -      +
     97E  VAL*     3.9    20.0    -      -       +      -
    104E  ALA      3.4     9.1    +      -       -      +
    105E  HIS      2.8    11.7    +      -       -      +
    107E  ALA*     1.3    73.9    -      -       -      +
    109E  LEU*     1.3    58.3    +      -       -      +
    111E  LEU*     2.9    21.0    +      -       +      +
    112E  VAL*     2.9    29.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 109 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31E  LEU*     5.5     0.2    -      -       +      -
     34E  THR*     4.9     3.6    -      -       +      -
     35E  LEU*     3.9    24.5    -      -       +      -
     38E  VAL*     4.2    31.0    -      -       +      -
     54E  ILE*     4.6     7.4    -      -       +      -
     95E  TYR*     4.2     4.4    -      -       +      +
    105E  HIS      2.6    19.8    +      -       -      +
    106E  LEU*     3.9    22.4    -      -       +      +
    108E  ALA*     1.3    69.7    -      -       -      +
    110E  ASP*     1.3    67.1    +      -       -      +
    112E  VAL*     3.3    17.9    -      -       +      +
    113E  TYR*     3.1    40.9    +      -       +      -
    148E  PHE*     4.1    22.2    -      -       +      -
    152E  VAL*     4.5     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 110 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106E  LEU      3.0    13.7    +      -       -      +
    107E  ALA*     3.2    14.9    -      -       -      +
    109E  LEU*     1.3    72.7    -      -       -      +
    111E  LEU*     1.3    55.9    +      -       +      +
    113E  TYR*     2.8    26.9    +      -       -      +
    114E  ASN*     2.7    26.9    +      -       -      +
    149E  GLN*     2.4    37.2    +      -       -      +
    152E  VAL*     4.0    12.0    -      -       +      +
    153E  ARG*     3.0    23.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 111 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107E  ALA      3.9    13.2    -      -       -      +
    108E  ALA*     2.9    17.9    +      -       +      +
    110E  ASP*     1.3    78.0    -      -       +      +
    112E  VAL*     1.3    64.4    +      -       +      +
    114E  ASN*     3.1    21.8    -      -       +      +
    115E  GLY*     3.0    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 112 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30E  ASP*     5.6     5.6    -      -       -      +
     31E  LEU*     5.1     7.6    -      -       +      -
     34E  THR*     4.8    11.9    -      -       +      -
     92E  TRP*     6.0     4.0    -      -       +      +
     95E  TYR*     3.8    23.3    -      -       +      -
    108E  ALA*     2.9    21.7    +      -       +      +
    109E  LEU*     3.3    24.0    -      -       +      +
    111E  LEU*     1.3    73.9    -      -       +      +
    113E  TYR*     1.3    64.1    +      -       +      +
    115E  GLY*     2.8    19.6    +      -       -      -
    116E  VAL*     3.0    22.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 113 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31E  LEU*     3.5    31.0    -      -       +      +
     35E  LEU*     3.7     1.1    -      -       +      +
     57E  GLN*     2.7    43.8    +      -       -      +
    109E  LEU*     3.1    29.1    +      -       +      +
    110E  ASP*     2.8    10.1    +      -       -      +
    112E  VAL*     1.3    76.8    -      -       +      +
    114E  ASN*     1.3    59.8    +      -       -      +
    116E  VAL*     2.9     9.1    +      -       +      -
    117E  ILE*     2.8    39.6    +      -       +      +
    145E  LEU*     3.5    36.3    -      -       +      -
    148E  PHE*     3.1    35.1    -      +       -      -
    149E  GLN*     3.3    21.8    -      -       +      -
    152E  VAL*     5.3     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 114 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110E  ASP*     2.7    44.9    +      -       -      +
    111E  LEU*     3.1    25.0    -      -       +      +
    113E  TYR*     1.3    72.7    -      -       -      +
    115E  GLY*     1.3    64.2    +      -       -      +
    117E  ILE*     5.0     1.6    -      -       -      -
    118E  GLU*     3.1    34.5    +      -       -      +
    149E  GLN*     3.3    12.5    +      -       -      +
    153E  ARG*     4.1    10.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 115 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27E  THR*     5.7     0.7    -      -       -      -
    111E  LEU      3.0     7.7    +      -       -      -
    112E  VAL      2.8    10.9    +      -       -      -
    114E  ASN*     1.3    77.3    -      -       -      +
    116E  VAL*     1.3    63.4    +      -       -      +
    118E  GLU*     4.2     7.1    -      -       -      +
    119E  ASP*     3.2    27.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 116 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24E  GLN*     5.4     0.2    -      -       -      +
     27E  THR*     4.1    27.4    -      -       +      +
     28E  TYR*     5.1     5.6    -      -       +      -
     31E  LEU*     3.9    33.4    -      -       +      -
    112E  VAL*     3.0    19.0    +      -       +      +
    113E  TYR*     2.9    18.5    +      -       +      +
    115E  GLY*     1.3    75.1    -      -       -      +
    117E  ILE*     1.3    50.6    +      -       -      +
    119E  ASP*     3.1     6.2    +      -       -      +
    120E  THR*     2.7    44.9    +      -       -      +
    145E  LEU*     4.0    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 117 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113E  TYR*     2.8    21.2    +      -       +      +
    114E  ASN*     4.5     1.3    -      -       -      +
    116E  VAL*     1.3    67.6    -      -       -      +
    118E  GLU*     1.3    67.9    +      -       -      +
    120E  THR*     2.8    21.6    +      -       -      -
    121E  ARG*     2.8    22.0    +      -       +      +
    142E  ALA*     5.9     1.3    -      -       +      -
    145E  LEU*     4.3    11.4    -      -       +      +
    146E  GLU*     3.3    53.6    -      -       +      +
    149E  GLN*     3.0    48.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 118 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114E  ASN*     3.1    24.3    +      -       -      +
    115E  GLY*     4.2     5.4    -      -       -      +
    117E  ILE*     1.3    79.1    -      -       -      +
    119E  ASP*     1.3    61.3    +      -       -      +
    121E  ARG*     3.8     7.9    -      -       -      +
    122E  LYS*     3.3    32.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 119 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24E  GLN*     4.9     6.6    +      -       -      +
     27E  THR*     5.4     8.5    -      -       +      +
     91E  THR*     5.1    11.1    -      -       -      +
     92E  TRP*     5.4     5.2    -      -       -      -
    115E  GLY      3.2    19.7    +      -       -      +
    116E  VAL*     3.1     4.9    +      -       -      +
    117E  ILE      3.0     0.4    -      -       -      -
    118E  GLU*     1.3    79.5    -      -       -      +
    120E  THR*     1.3    65.1    +      -       -      +
    122E  LYS*     3.2    22.9    +      -       -      +
    123E  SER*     3.2    27.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 120 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24E  GLN*     3.6    30.8    +      -       -      +
     28E  TYR*     4.8     2.2    -      -       -      +
    116E  VAL*     2.7    34.6    +      -       -      +
    117E  ILE*     2.8    16.0    +      -       -      -
    119E  ASP*     1.3    71.5    -      -       -      +
    121E  ARG*     1.3    61.6    +      -       -      -
    123E  SER*     3.2     5.4    +      -       -      -
    124E  ILE*     3.0    27.4    +      -       +      +
    138E  LEU*     4.2    16.3    -      -       +      +
    142E  ALA*     4.0    32.5    -      -       +      +
    145E  LEU*     5.0     5.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 121 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117E  ILE*     2.8    28.2    +      -       +      +
    118E  GLU*     3.8     7.2    -      -       -      +
    120E  THR*     1.3    74.0    -      -       -      +
    122E  LYS*     1.3    66.0    +      -       -      +
    124E  ILE*     3.0    30.7    +      -       -      +
    125E  GLU*     3.1    29.0    +      -       -      +
    142E  ALA*     5.5     0.9    -      -       +      -
    146E  GLU*     2.8    27.6    +      -       -      -
     71J  ARG*     3.1    24.9    -      -       -      +
     75J  LEU*     4.4     7.1    -      -       -      +
    130J  LEU      5.0     2.8    +      -       -      -
    131J  ASP*     3.7    24.2    +      -       -      +
    132J  LEU*     4.5     2.2    -      -       -      +
    133J  VAL*     3.6    18.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 122 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118E  GLU*     3.3    22.7    +      -       +      +
    119E  ASP*     3.2    26.0    +      -       -      +
    121E  ARG*     1.3    76.1    -      -       -      +
    123E  SER*     1.3    58.6    +      -       -      +
    125E  GLU*     3.6     7.2    +      -       -      +
    126E  LYS*     3.0    53.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 123 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  LEU*     4.9    19.3    +      -       -      +
     24E  GLN*     4.3    12.6    +      -       -      -
    119E  ASP*     3.2    14.3    +      -       -      -
    120E  THR*     3.5     9.2    -      -       -      -
    121E  ARG      3.1     0.8    -      -       -      -
    122E  LYS*     1.3    74.8    -      -       -      +
    124E  ILE*     1.3    57.3    +      -       -      +
    126E  LYS*     2.9     8.6    +      -       -      +
    127E  LEU*     2.8    42.7    +      -       -      +
    138E  LEU*     4.1    17.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 124 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120E  THR*     3.0    16.0    +      -       +      +
    121E  ARG*     3.0    23.4    +      -       -      +
    123E  SER*     1.3    72.8    -      -       -      +
    125E  GLU*     1.3    65.8    +      -       +      +
    127E  LEU*     3.0    16.9    +      -       -      +
    128E  GLU      3.0    10.6    +      -       -      -
    135E  GLN*     3.2    22.4    +      -       +      +
    138E  LEU*     4.1    18.8    -      -       +      +
    139E  ILE*     3.4    39.9    -      -       +      +
    142E  ALA*     3.8    28.9    -      -       +      -
    132J  LEU*     4.9    11.4    -      -       +      -
    133J  VAL*     4.9     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 125 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121E  ARG*     3.1    22.1    +      -       +      +
    122E  LYS*     3.9     8.7    +      -       -      +
    124E  ILE*     1.3    84.2    -      -       +      +
    126E  LYS*     1.3    59.5    +      -       -      +
    128E  GLU*     3.4    32.2    -      -       -      +
    129E  ASP*     4.8     1.6    +      -       -      +
    132J  LEU*     5.5     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 126 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  LEU*     4.1    30.5    -      -       +      +
    122E  LYS*     3.0    43.3    +      -       -      +
    123E  SER*     2.9     9.4    +      -       -      +
    125E  GLU*     1.3    76.9    -      -       -      +
    127E  LEU*     1.3    53.1    +      -       -      +
    129E  ASP*     4.4     2.7    +      -       -      +
    130E  LEU*     2.7    31.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 127 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17E  VAL*     3.6    32.1    -      -       +      -
     20E  LEU*     3.5    26.9    -      -       +      -
     21E  LEU*     4.8     4.5    -      -       +      -
    123E  SER*     2.8    16.5    +      -       -      +
    124E  ILE      3.7     3.6    -      -       -      +
    126E  LYS*     1.3    74.0    -      -       -      +
    128E  GLU*     1.3    52.8    +      -       -      +
    129E  ASP      2.6     8.6    +      -       -      -
    130E  LEU*     2.6    37.0    +      -       +      -
    131E  ASP      3.2    14.5    +      -       -      +
    132E  LEU      4.5     0.7    +      -       -      -
    134E  SER*     4.2    17.9    -      -       -      -
    135E  GLN*     4.2    17.0    -      -       +      +
    138E  LEU*     3.4    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 128 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128C  GLU*     5.9     3.1    -      -       -      +
    124E  ILE      3.0     5.4    +      -       -      +
    125E  GLU*     3.4    30.9    -      -       -      +
    126E  LYS      3.5     0.4    -      -       -      -
    127E  LEU*     1.3    75.1    -      -       -      +
    129E  ASP*     1.3    67.7    +      -       +      +
    130E  LEU      3.6     0.6    +      -       -      -
    132E  LEU*     4.4    16.0    -      -       +      +
    135E  GLN*     3.3    25.7    -      -       -      +
    128J  GLU*     3.9    23.7    -      -       -      +
    132J  LEU*     4.0    19.2    -      -       +      +
----------------------------------------------------------
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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