Contacts of the helix formed by residues 102 - 128 (chain L) in PDB entry 1VEQ


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 VAL 102 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42L  VAL*     3.8    17.0    -      -       +      -
     43L  VAL      3.1    13.6    +      -       -      +
     44L  GLY*     3.9    12.3    -      -       -      +
     45L  PRO*     4.7     1.6    -      -       +      -
     46L  ASN*     3.6    37.7    -      -       -      +
     47L  PHE      4.6     0.2    -      -       -      +
     50L  VAL*     3.2    37.5    -      -       +      -
    101L  THR*     1.3    76.8    -      -       -      +
    103L  GLN*     1.3    75.2    +      -       +      +
    105L  HIS*     3.2     2.3    +      -       -      +
    106L  LEU*     3.1    32.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 103 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  PRO*     4.5    18.8    -      -       -      +
     46L  ASN*     4.8     4.5    +      -       -      +
    101L  THR*     3.6    10.1    -      -       -      +
    102L  VAL*     1.3    89.8    -      -       +      +
    104L  ALA*     1.3    66.8    +      -       -      +
    106L  LEU*     3.4     3.7    +      -       -      +
    107L  ALA*     3.0    23.7    +      -       -      +
    155L  HIS*     4.0    20.4    +      -       -      +
    156L  LEU*     4.1    19.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 104 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97L  VAL*     4.8     6.1    -      -       +      -
    100L  ASP*     3.5    28.9    -      -       +      +
    101L  THR*     2.9    24.6    +      -       -      +
    103L  GLN*     1.3    78.6    -      -       -      +
    105L  HIS*     1.3    62.9    +      -       -      +
    107L  ALA*     3.5     4.3    -      -       -      +
    108L  ALA*     3.0    21.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 105 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38L  VAL*     3.9    20.3    -      -       +      +
     41L  ASN*     3.2    28.4    +      -       +      -
     42L  VAL*     3.7    23.1    -      -       +      -
     50L  VAL*     6.5     0.4    -      -       +      -
     95L  TYR*     2.6    40.2    +      +       -      +
     97L  VAL*     3.1    29.6    -      -       +      +
     98L  GLU      3.1    12.4    +      -       -      -
    100L  ASP*     3.6     6.5    +      -       +      -
    101L  THR      3.4    19.3    +      -       -      -
    102L  VAL      3.2     6.0    +      -       -      +
    104L  ALA*     1.3    78.0    -      -       -      +
    106L  LEU*     1.3    56.4    +      -       +      +
    108L  ALA*     2.8     3.4    +      -       -      -
    109L  LEU*     2.5    37.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 106 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38L  VAL*     6.5     0.7    -      -       +      -
     50L  VAL*     3.9    10.8    -      -       +      -
     53L  MET*     4.1    16.6    -      -       +      -
     54L  ILE*     6.2     0.9    -      -       +      -
    102L  VAL*     3.1    36.4    +      -       +      +
    103L  GLN*     3.8     5.6    -      -       -      +
    105L  HIS*     1.3    79.1    -      -       +      +
    107L  ALA*     1.3    57.9    +      -       -      +
    109L  LEU*     4.1     9.6    -      -       +      -
    110L  ASP*     2.8    26.5    +      -       -      +
    152L  VAL*     3.1    41.0    -      -       +      +
    155L  HIS*     3.4    37.2    -      -       +      -
    156L  LEU*     4.0    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 107 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103L  GLN      3.0    18.7    +      -       -      +
    104L  ALA*     3.5     4.7    -      -       -      +
    106L  LEU*     1.3    75.8    -      -       -      +
    108L  ALA*     1.3    61.2    +      -       -      +
    110L  ASP*     3.0     8.0    -      -       -      +
    111L  LEU*     3.0    27.7    -      -       +      +
    156L  LEU*     3.8    21.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 108 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95L  TYR*     3.5    23.1    -      -       +      +
     97L  VAL*     4.0    13.7    -      -       +      -
    104L  ALA      3.0    12.1    +      -       -      +
    105L  HIS      2.8     7.5    +      -       -      +
    107L  ALA*     1.3    75.8    -      -       -      +
    109L  LEU*     1.3    60.9    +      -       -      +
    111L  LEU*     3.4    14.2    +      -       -      +
    112L  VAL*     2.9    25.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 109 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31L  LEU*     5.6     0.4    -      -       +      -
     34L  THR*     4.7     9.0    -      -       +      -
     35L  LEU*     3.9    29.2    -      -       +      -
     38L  VAL*     4.2    31.6    -      -       +      -
     54L  ILE*     5.4     2.9    -      -       +      -
     95L  TYR*     4.1     7.4    -      -       +      -
    105L  HIS      2.5    18.9    +      -       -      +
    106L  LEU*     3.5    14.4    -      -       +      +
    108L  ALA*     1.3    71.8    -      -       -      +
    110L  ASP*     1.3    65.6    +      -       -      +
    112L  VAL*     2.9    28.5    +      -       +      +
    113L  TYR*     3.0    28.7    +      -       +      -
    148L  PHE*     4.2    17.7    -      -       +      -
    152L  VAL*     4.3     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 110 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106L  LEU      2.8    14.3    +      -       -      +
    107L  ALA*     3.0    16.8    -      -       -      +
    109L  LEU*     1.3    77.8    -      -       -      +
    111L  LEU*     1.3    67.3    +      -       +      +
    113L  TYR*     3.3     2.8    +      -       -      +
    114L  ASN*     2.9    27.6    +      -       -      +
    149L  GLN*     3.4     8.9    +      -       -      +
    152L  VAL*     4.2     8.7    -      -       +      +
    153L  ARG*     2.7    47.8    +      -       -      +
    156L  LEU*     4.6    10.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 111 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107L  ALA*     3.0    20.9    -      -       +      +
    108L  ALA*     3.4    12.1    +      -       -      +
    109L  LEU      3.1     0.4    -      -       -      -
    110L  ASP*     1.3    84.2    -      -       +      +
    112L  VAL*     1.3    67.1    +      -       +      +
    114L  ASN*     2.9    29.7    +      -       +      +
    115L  GLY      3.1     5.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 112 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30L  ASP*     5.0    11.7    -      -       -      +
     31L  LEU*     4.7    16.6    -      -       +      -
     34L  THR*     5.3     8.7    -      -       +      -
     92L  TRP*     5.7     6.5    -      -       +      -
     95L  TYR*     4.4    13.7    -      -       +      -
    108L  ALA      2.9    20.6    -      -       -      +
    109L  LEU*     2.9    25.1    +      -       +      +
    111L  LEU*     1.3    75.5    -      -       +      +
    113L  TYR*     1.3    63.3    +      -       +      +
    115L  GLY*     3.3     3.1    +      -       -      -
    116L  VAL*     3.1    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 113 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31L  LEU*     3.4    30.2    -      -       +      +
     35L  LEU*     3.5    17.3    -      -       +      +
     57L  GLN*     3.2    27.4    +      -       -      +
    109L  LEU*     3.0    27.1    +      -       +      +
    110L  ASP      3.6     4.5    -      -       -      +
    112L  VAL*     1.3    75.3    -      -       +      +
    114L  ASN*     1.3    58.2    +      -       -      +
    116L  VAL*     4.2     5.8    -      -       +      -
    117L  ILE*     2.7    42.6    +      -       +      +
    145L  LEU*     3.6    44.4    -      -       +      -
    148L  PHE*     3.4    33.0    -      +       -      -
    149L  GLN*     3.4    27.6    -      -       +      +
    152L  VAL*     5.5     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 114 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7J  PRO*     3.7    28.4    -      -       +      +
    110L  ASP*     2.9    21.7    +      -       -      +
    111L  LEU*     2.9    20.1    +      -       -      +
    113L  TYR*     1.3    76.4    -      -       -      +
    115L  GLY*     1.3    58.0    +      -       -      +
    117L  ILE      3.9     0.2    -      -       -      -
    118L  GLU*     2.9    35.0    +      -       -      +
    149L  GLN*     3.0    12.0    +      -       -      +
    153L  ARG*     3.1    15.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 115 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92L  TRP*     4.3    14.3    -      -       -      -
    111L  LEU      3.1     6.8    +      -       -      -
    112L  VAL*     3.7     4.7    -      -       -      -
    113L  TYR      3.2     0.2    -      -       -      -
    114L  ASN*     1.3    80.3    -      -       -      +
    116L  VAL*     1.3    60.2    +      -       -      +
    118L  GLU*     4.1     7.2    -      -       -      -
    119L  ASP*     3.2    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 116 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27L  THR*     3.9    30.7    -      -       +      +
     28L  TYR*     4.7     7.4    -      -       +      -
     31L  LEU*     4.5    31.2    -      -       +      -
     92L  TRP*     4.7     7.4    -      -       +      -
    112L  VAL*     3.1    22.4    -      -       +      +
    113L  TYR*     3.0    11.5    +      -       +      +
    115L  GLY*     1.3    77.4    -      -       -      +
    117L  ILE*     1.3    62.0    +      -       +      +
    119L  ASP*     3.8     1.8    +      -       -      +
    120L  THR*     2.7    39.2    +      -       -      +
    145L  LEU*     4.7    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 117 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6J  ILE*     4.2    10.3    -      -       +      -
      7J  PRO*     4.3    10.5    -      -       +      +
    113L  TYR*     2.7    25.8    +      -       +      +
    114L  ASN      4.0     1.6    -      -       -      +
    116L  VAL*     1.3    73.8    -      -       +      +
    118L  GLU*     1.3    58.0    +      -       -      +
    120L  THR*     3.3     6.8    +      -       -      -
    121L  ARG*     2.9    36.4    +      -       +      +
    142L  ALA*     5.6     3.4    -      -       +      +
    145L  LEU*     4.5    11.9    -      -       +      -
    146L  GLU*     3.5    55.0    -      -       +      +
    149L  GLN*     3.5    38.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 118 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7J  PRO*     3.9    30.5    +      -       +      +
      8J  GLY*     5.2     2.9    -      -       -      -
    114L  ASN*     2.9    20.3    +      -       -      +
    115L  GLY*     4.4     5.4    -      -       -      +
    117L  ILE*     1.3    74.2    -      -       -      +
    119L  ASP*     1.3    71.3    +      -       -      +
    120L  THR      3.0     1.0    +      -       -      -
    121L  ARG*     3.2     4.9    +      -       +      +
    122L  LYS*     3.1    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 119 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23L  LYS*     3.3    34.5    +      -       +      -
     24L  GLN*     4.7     7.4    -      -       -      +
     27L  THR*     5.2     9.2    +      -       +      +
     91L  THR*     5.0     4.1    +      -       -      -
     92L  TRP*     5.0    11.0    -      -       -      -
    115L  GLY*     3.2    23.9    +      -       -      +
    116L  VAL*     4.2     3.6    -      -       -      +
    118L  GLU*     1.3    84.0    -      -       -      +
    120L  THR*     1.3    60.5    +      -       -      +
    122L  LYS*     3.8     6.4    +      -       -      +
    123L  SER*     3.1    26.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 120 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24L  GLN*     2.6    24.9    +      -       -      +
     28L  TYR*     4.8     1.9    +      -       -      +
    116L  VAL*     2.7    26.8    +      -       -      +
    117L  ILE*     3.3     7.1    -      -       -      -
    118L  GLU      3.0     0.6    +      -       -      -
    119L  ASP*     1.3    75.3    -      -       -      +
    121L  ARG*     1.3    68.7    +      -       +      +
    123L  SER*     2.8    16.2    +      -       -      -
    124L  ILE*     2.8    29.0    +      -       +      +
    138L  LEU*     3.6    28.5    -      -       +      +
    141L  HIS*     5.7     0.4    -      -       +      -
    142L  ALA*     4.4    14.4    -      -       +      +
    145L  LEU*     5.7     4.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 121 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6J  ILE*     3.5    19.2    -      -       -      +
      7J  PRO      4.3     9.4    -      -       -      +
      8J  GLY*     5.2     9.3    +      -       -      -
      9J  LEU*     4.3    18.8    -      -       -      +
     71J  ARG*     3.7     5.9    -      -       -      +
    131J  ASP*     2.6    33.8    +      -       -      +
    132J  LEU*     4.7     3.2    -      -       -      +
    133J  VAL*     3.9    10.6    -      -       -      +
    117L  ILE*     2.9    30.5    +      -       +      +
    118L  GLU*     3.5     5.8    -      -       +      +
    120L  THR*     1.3    72.9    -      -       +      +
    122L  LYS*     1.3    63.9    +      -       -      +
    124L  ILE*     2.9    25.3    +      -       -      +
    125L  GLU*     3.0    15.0    +      -       -      +
    142L  ALA*     5.8     0.7    -      -       +      -
    146L  GLU*     2.9    39.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 122 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118L  GLU      3.1    12.8    +      -       -      +
    119L  ASP*     3.9     6.1    -      -       -      +
    121L  ARG*     1.3    78.3    -      -       -      +
    123L  SER*     1.3    64.0    +      -       -      +
    124L  ILE      3.1     0.3    +      -       -      -
    125L  GLU*     3.3     5.9    +      -       -      +
    126L  LYS*     2.9    38.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 123 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20L  LEU*     3.3    30.8    +      -       -      +
     23L  LYS*     5.8     3.1    -      -       -      +
     24L  GLN*     4.2    11.4    +      -       -      -
    119L  ASP      3.1    13.9    +      -       -      -
    120L  THR*     2.8    16.9    +      -       -      -
    122L  LYS*     1.3    74.3    -      -       -      +
    124L  ILE*     1.3    59.3    +      -       -      +
    126L  LYS*     3.9     7.9    -      -       -      +
    127L  LEU*     3.0    33.5    +      -       -      +
    138L  LEU*     5.0     9.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 124 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132J  LEU*     4.6    13.0    -      -       +      -
    133J  VAL*     5.0     6.5    -      -       +      -
    120L  THR*     2.8    31.4    +      -       +      +
    121L  ARG*     2.9    16.6    +      -       -      +
    123L  SER*     1.3    76.2    -      -       -      +
    125L  GLU*     1.3    58.9    +      -       -      +
    127L  LEU*     2.7    34.8    +      -       -      +
    128L  GLU      3.3     5.0    +      -       -      -
    135L  GLN*     3.5    28.2    +      -       +      +
    138L  LEU*     4.0    15.5    -      -       +      +
    139L  ILE*     3.8    37.5    -      -       +      +
    142L  ALA*     4.5     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 125 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132J  LEU*     4.6    19.9    -      -       +      +
    121L  ARG      3.0     8.3    +      -       -      +
    122L  LYS*     3.8     8.5    -      -       -      +
    124L  ILE*     1.3    81.5    -      -       -      +
    126L  LYS*     1.3    62.2    +      -       -      +
    127L  LEU      3.2     0.7    +      -       -      -
    128L  GLU*     3.4    25.6    +      -       -      +
    129L  ASP*     4.6     6.6    -      -       -      +
    135L  GLN*     5.1     2.0    -      -       -      +
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Residues in contact with LYS 126 (chain L). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
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     20L  LEU*     4.5    26.0    -      -       +      +
    122L  LYS*     2.9    26.9    +      -       -      +
    123L  SER*     3.9     7.0    -      -       -      +
    124L  ILE      3.0     0.2    +      -       -      -
    125L  GLU*     1.3    76.6    -      -       -      +
    127L  LEU*     1.3    61.2    +      -       -      +
    128L  GLU      3.8     0.2    +      -       -      -
    129L  ASP*     4.1     9.3    +      -       -      +
    130L  LEU*     3.6    19.1    +      -       +      +
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Residues in contact with LEU 127 (chain L). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17L  VAL*     3.9    29.8    -      -       +      -
     20L  LEU*     4.1    10.5    -      -       +      -
     21L  LEU*     5.0     7.2    -      -       +      -
    123L  SER*     3.0    24.5    +      -       -      +
    124L  ILE*     2.7    20.3    +      -       -      +
    126L  LYS*     1.3    70.5    -      -       -      +
    128L  GLU*     1.3    55.7    +      -       -      +
    129L  ASP      2.9     5.8    -      -       -      -
    130L  LEU*     2.8    39.6    +      -       +      +
    131L  ASP      3.2    25.1    +      -       -      +
    134L  SER*     3.2    29.6    -      -       -      +
    135L  GLN*     4.2     9.9    -      -       +      -
    138L  LEU*     4.5    11.2    -      -       +      -
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Residues in contact with GLU 128 (chain L). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128J  GLU*     4.0    14.5    -      -       -      +
    132J  LEU*     4.8    14.6    -      -       -      +
    128K  GLU*     4.0    19.4    -      -       -      +
    124L  ILE      3.3     6.0    +      -       -      +
    125L  GLU*     3.4    23.4    +      -       -      +
    127L  LEU*     1.3    74.9    -      -       -      +
    129L  ASP*     1.3    65.1    +      -       -      +
    130L  LEU      5.2     0.2    -      -       -      -
    132L  LEU*     4.5    22.1    -      -       +      +
    135L  GLN*     3.3    30.5    +      -       -      +
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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) +   -    +    +   +   +    +    -
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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