Contacts of the helix formed by residues 110 - 135 (chain C) in PDB entry 1EZV


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 ARG 110 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105C  SER*     3.3    23.6    +      -       -      +
    106C  TYR      4.1     2.2    -      -       -      -
    107C  ARG      2.7    16.1    +      -       -      +
    109C  PRO*     1.3    86.9    -      -       -      +
    111C  VAL*     1.3    63.8    +      -       -      +
    112C  THR*     3.4     1.8    -      -       -      -
    113C  LEU*     3.2    30.6    +      -       +      +
    114C  TRP*     3.0    21.5    +      -       -      +
    200C  ALA      5.6     1.8    -      -       -      +
    201C  LEU*     6.3     0.2    -      -       -      -
    204C  HIS*     3.6    24.8    +      -       +      +
    205C  GLY      2.7    35.2    +      -       -      -
    206C  SER      3.6    10.7    +      -       -      -
    207C  SER*     4.0    18.0    +      -       -      +
    314C  ARG*     3.8    36.2    -      -       -      +
    402C  HEM      4.8    10.1    -      -       -      -
     52F  GLU*     5.0     4.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 111 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106C  TYR      3.5    19.7    -      -       -      +
    108C  SER*     3.8    21.5    -      -       -      +
    109C  PRO      3.4     3.2    +      -       -      -
    110C  ARG*     1.3    76.3    -      -       -      +
    112C  THR*     1.3    60.0    +      -       -      +
    114C  TRP*     3.1     6.1    +      -       -      +
    115C  ASN*     2.9    46.9    +      -       -      +
    306C  PRO*     3.8    24.0    -      -       +      -
    307C  PHE*     5.3    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 112 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109C  PRO      5.1     0.8    +      -       -      -
    110C  ARG*     3.4     0.4    -      -       -      -
    111C  VAL*     1.3    78.1    -      -       -      +
    113C  LEU*     1.3    63.6    +      -       -      +
    115C  ASN*     3.1     9.4    +      -       +      +
    116C  VAL*     3.0    35.2    +      -       +      +
    200C  ALA*     4.2    16.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 113 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110C  ARG*     3.2    34.8    +      -       +      +
    112C  THR*     1.3    78.9    -      -       -      +
    114C  TRP*     1.3    61.2    +      -       -      +
    116C  VAL*     3.5     1.8    +      -       -      +
    117C  GLY      3.1    17.2    +      -       -      -
    197C  HIS*     3.2    64.8    +      -       +      +
    200C  ALA*     4.1    14.3    -      -       +      +
    201C  LEU*     3.9    29.2    -      -       +      +
    402C  HEM      3.5    39.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 114 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  MET*     4.1    18.4    -      -       +      -
    100C  GLY*     4.2    16.4    -      -       -      -
    101C  LEU*     3.5    32.8    -      -       +      -
    106C  TYR*     3.4    34.6    -      +       +      +
    110C  ARG      3.0    11.9    +      -       -      +
    111C  VAL*     3.1     8.5    +      -       -      +
    113C  LEU*     1.3    74.0    -      -       -      +
    115C  ASN*     1.3    75.2    +      -       -      +
    117C  GLY*     3.1     3.5    +      -       -      -
    118C  VAL*     3.0    30.9    +      -       +      +
    302C  LEU*     2.8    46.3    +      -       +      -
    303C  LEU*     4.8     0.4    -      -       -      -
    305C  LEU*     5.0     2.4    -      -       +      +
    306C  PRO*     4.6     9.6    -      -       +      +
    402C  HEM      3.7    51.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 115 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111C  VAL*     2.9    39.5    +      -       -      +
    112C  THR*     3.1     7.7    +      -       -      +
    114C  TRP*     1.3    81.1    -      -       -      +
    116C  VAL*     1.3    63.9    +      -       +      +
    118C  VAL*     3.1    13.0    +      -       -      +
    119C  ILE*     3.2    20.6    +      -       +      +
    303C  LEU*     3.3    35.8    -      -       +      +
    306C  PRO*     5.4     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 116 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112C  THR*     3.0    30.5    +      -       +      +
    113C  LEU*     3.8     4.7    -      -       -      +
    115C  ASN*     1.3    73.8    -      -       +      +
    117C  GLY*     1.3    65.8    +      -       -      +
    119C  ILE*     3.1    15.8    +      -       +      +
    120C  ILE*     3.0    23.9    +      -       +      +
    193C  MET*     3.6    33.2    -      -       +      +
    196C  MET*     4.4    19.1    -      -       +      +
    197C  HIS*     3.9    19.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 117 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113C  LEU      3.1    13.8    +      -       -      -
    114C  TRP      3.1     5.8    +      -       -      -
    116C  VAL*     1.3    79.3    -      -       -      +
    118C  VAL*     1.3    59.5    +      -       -      +
    120C  ILE*     3.3     4.9    +      -       -      +
    121C  PHE      3.1    18.9    +      -       -      -
    197C  HIS*     4.1     4.0    -      -       -      -
    402C  HEM      3.1    44.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 118 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  TRP*     3.0    24.1    +      -       -      +
    115C  ASN      3.1     7.6    +      -       -      +
    117C  GLY*     1.3    75.1    -      -       -      +
    119C  ILE*     1.3    65.1    +      -       +      +
    121C  PHE*     3.3     8.1    +      -       +      +
    122C  THR*     3.1    23.3    +      -       -      +
    299C  ILE*     4.5    24.2    -      -       +      +
    300C  LEU*     5.4     4.5    -      -       +      -
    302C  LEU*     4.0    25.4    -      -       +      -
    303C  LEU*     4.2    29.4    -      -       +      -
    402C  HEM      3.8    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 119 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115C  ASN*     3.2    15.1    +      -       +      +
    116C  VAL*     3.1    18.3    +      -       +      +
    118C  VAL*     1.3    79.4    -      -       +      +
    120C  ILE*     1.3    62.0    +      -       -      +
    122C  THR*     3.2     9.0    +      -       -      -
    123C  LEU*     3.0    40.4    +      -       +      +
    193C  MET*     4.4    18.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 120 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93C  MET*     4.2     3.4    -      -       +      -
    116C  VAL*     3.0    19.2    +      -       +      +
    117C  GLY*     3.6     9.2    -      -       -      +
    119C  ILE*     1.3    74.1    -      -       -      +
    121C  PHE*     1.3    50.4    -      -       -      +
    123C  LEU*     3.1    10.2    +      -       -      +
    124C  THR*     2.7    47.4    +      -       -      +
    190C  ILE*     4.4     9.2    -      -       +      +
    193C  MET*     3.7    44.9    -      -       +      +
    194C  VAL*     4.0    10.3    -      -       +      +
    197C  HIS*     4.0    21.1    -      -       +      +
    402C  HEM      3.5    38.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 121 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  PHE*     4.8     6.7    -      +       -      -
     93C  MET*     3.7    27.6    -      -       +      -
     94C  PHE*     4.1    20.0    -      +       -      -
     97C  MET*     3.8    32.1    -      -       +      -
    117C  GLY      3.1    12.8    +      -       -      +
    118C  VAL*     3.4    10.8    -      -       -      +
    120C  ILE*     1.3    72.7    -      -       -      +
    122C  THR*     1.3    66.4    +      -       -      +
    124C  THR*     3.3     0.9    +      -       -      -
    125C  ILE*     3.0    52.6    +      -       +      +
    278C  PHE*     3.9    27.6    -      +       -      -
    299C  ILE*     4.3    24.2    -      -       +      -
    302C  LEU*     4.7     6.7    -      -       +      -
    402C  HEM      4.0     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 122 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118C  VAL*     3.1    15.9    +      -       -      +
    119C  ILE*     3.6    10.9    -      -       -      -
    121C  PHE*     1.3    75.6    -      -       -      +
    123C  LEU*     1.3    60.9    +      -       +      +
    125C  ILE*     3.3    10.5    +      -       -      +
    126C  ALA*     3.0    27.6    +      -       +      +
    296C  PHE*     6.5     0.4    -      -       +      -
    299C  ILE*     4.0    23.0    -      -       +      +
    300C  LEU*     5.9     2.1    -      -       -      +
    505C  SMA      3.8    15.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 123 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119C  ILE*     3.0    29.6    +      -       +      +
    120C  ILE*     3.1     9.2    +      -       -      +
    122C  THR*     1.3    79.6    -      -       +      +
    124C  THR*     1.3    58.2    +      -       -      +
    126C  ALA*     3.3     8.0    +      -       +      +
    127C  THR*     2.8    33.1    +      -       -      -
    186C  VAL*     4.1    15.8    -      -       +      +
    189C  ILE*     4.1    17.3    -      -       +      -
    190C  ILE*     3.7    20.0    -      -       +      -
    193C  MET*     3.9    28.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 124 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89C  PHE*     4.2    24.3    -      -       +      -
     90C  PHE*     3.8    20.9    -      -       +      -
     93C  MET*     3.6    30.0    -      -       +      +
    120C  ILE*     2.7    27.9    +      -       -      +
    121C  PHE      3.7     4.0    -      -       -      -
    122C  THR      3.2     0.2    -      -       -      -
    123C  LEU*     1.3    74.5    -      -       -      +
    125C  ILE*     1.3    66.1    +      -       -      +
    127C  THR*     3.2     2.5    +      -       -      -
    128C  ALA*     3.0    24.6    +      -       -      +
    190C  ILE*     3.9    17.8    -      -       +      +
    401C  HEM      4.8     4.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 125 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     90C  PHE*     3.9    23.8    -      -       +      -
    121C  PHE*     3.0    55.3    +      -       +      +
    122C  THR*     3.6     5.6    -      -       -      +
    124C  THR*     1.3    76.6    -      -       -      +
    126C  ALA*     1.3    62.0    +      -       -      +
    128C  ALA*     3.4     2.4    +      -       -      +
    129C  PHE*     3.2    20.8    +      -       -      +
    275C  LEU*     4.0    22.9    -      -       +      +
    278C  PHE*     4.7     9.6    -      -       +      -
    299C  ILE*     4.4    14.8    -      -       +      -
    505C  SMA      3.7    38.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 126 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122C  THR*     3.0    17.8    +      -       +      +
    123C  LEU*     3.7     9.9    -      -       +      +
    125C  ILE*     1.3    76.7    -      -       -      +
    127C  THR*     1.3    62.1    +      -       -      +
    129C  PHE*     3.4     7.4    +      -       -      +
    130C  LEU*     3.1    34.1    +      -       +      +
    186C  VAL*     5.7     3.6    -      -       +      -
    505C  SMA      3.8    34.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 127 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123C  LEU      2.8    23.5    +      -       -      -
    124C  THR*     3.2     5.8    +      -       -      -
    126C  ALA*     1.3    76.3    -      -       -      +
    128C  ALA*     1.3    61.8    +      -       -      +
    130C  LEU*     3.3     8.9    +      -       -      +
    131C  GLY      3.1     6.1    +      -       -      -
    183C  HIS*     2.9    35.2    +      -       +      +
    186C  VAL*     3.1    22.8    -      -       +      +
    187C  PRO*     3.8    16.6    -      -       +      -
    190C  ILE*     3.3    10.3    -      -       -      +
    401C  HEM      3.7    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 128 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86C  ALA*     5.3     0.2    -      -       +      -
     90C  PHE*     3.8    25.6    -      -       +      -
    124C  THR      3.0    15.4    +      -       -      +
    125C  ILE      3.9     3.8    -      -       -      +
    127C  THR*     1.3    74.4    -      -       -      +
    129C  PHE*     1.3    60.4    +      -       -      +
    131C  GLY      3.3     0.5    +      -       -      -
    132C  TYR*     2.9    30.4    +      -       -      +
    272C  GLU*     5.5     0.7    -      -       -      -
    274C  TYR*     3.9    18.3    +      -       +      +
    401C  HEM      3.6    29.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 129 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125C  ILE      3.2    14.5    +      -       -      +
    126C  ALA      3.7    10.5    -      -       -      +
    128C  ALA*     1.3    76.3    -      -       -      +
    130C  LEU*     1.3    77.4    +      -       +      +
    132C  TYR*     3.3     8.9    +      +       +      +
    133C  CYS*     3.1    54.0    +      -       -      -
    143C  GLY*     3.9     2.2    -      -       -      -
    144C  ALA*     3.8    18.2    -      -       -      -
    147C  ILE*     3.5    38.6    -      -       +      -
    148C  THR*     4.8     1.8    -      -       +      -
    179C  PHE*     3.9    15.7    -      +       -      -
    272C  GLU*     4.9     7.6    -      -       -      +
    275C  LEU*     5.5     3.8    -      -       +      -
    505C  SMA      3.6    50.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 130 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126C  ALA*     3.1    22.1    +      -       +      +
    127C  THR*     3.5     7.4    -      -       -      +
    129C  PHE*     1.3    88.9    -      -       +      +
    131C  GLY*     1.3    63.3    +      -       -      +
    133C  CYS*     3.4    14.7    +      -       -      +
    134C  CYS*     3.4    16.5    +      -       -      -
    179C  PHE*     3.7    41.3    -      -       +      +
    182C  LEU*     3.9    30.1    -      -       +      +
    183C  HIS*     3.8    15.7    -      -       +      -
    186C  VAL*     4.3    13.7    -      -       +      -
    505C  SMA      4.1    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 131 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127C  THR      3.1    10.7    +      -       -      -
    128C  ALA      3.3     1.8    +      -       -      -
    129C  PHE      3.2     0.2    -      -       -      -
    130C  LEU*     1.3    73.1    -      -       -      +
    132C  TYR*     1.3    67.7    +      -       -      +
    134C  CYS*     2.9    20.4    +      -       -      +
    135C  VAL      3.8     1.7    +      -       -      -
    183C  HIS*     3.3    28.9    +      -       -      -
    401C  HEM      3.5    25.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 132 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128C  ALA      2.9    17.0    +      -       -      +
    129C  PHE*     3.6     7.4    -      +       +      +
    131C  GLY*     1.3    75.7    -      -       -      +
    133C  CYS*     1.3    55.2    +      -       -      +
    134C  CYS      3.3     0.7    +      -       -      -
    135C  VAL*     3.6     9.2    +      -       -      +
    139C  MET*     3.4    46.0    -      -       +      +
    140C  SER*     2.6    28.6    +      -       -      -
    143C  GLY*     5.9     2.0    -      -       -      -
    252C  GLY*     5.8     0.2    -      -       -      -
    253C  HIS*     4.0    16.4    +      -       -      +
    256C  ASN*     3.4    23.2    +      -       +      +
    270C  VAL      5.5     1.4    +      -       -      -
    272C  GLU*     3.4    49.5    +      -       +      +
    274C  TYR*     5.2     0.9    -      -       -      +
    401C  HEM      3.7    33.5    -      -       +      -
    505C  SMA      5.0     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 133 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129C  PHE*     3.1    58.0    +      -       -      -
    130C  LEU      3.6     8.1    -      -       -      +
    131C  GLY      3.2     0.2    -      -       -      -
    132C  TYR*     1.3    77.0    -      -       -      +
    134C  CYS*     1.3    62.8    +      -       -      +
    135C  VAL      3.3     0.4    -      -       -      -
    136C  TYR*     3.2    15.9    +      -       -      +
    140C  SER*     3.8    12.9    -      -       -      +
    143C  GLY*     4.9     0.4    -      -       -      -
    144C  ALA*     3.7    23.1    -      -       +      -
    176C  ILE*     3.7    19.5    -      -       +      +
    179C  PHE*     3.9    18.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 134 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54C  TYR*     2.7    40.2    +      -       +      +
     61C  ALA*     3.7     7.3    -      -       -      +
    130C  LEU      3.4    17.5    -      -       -      -
    131C  GLY*     2.9    15.6    +      -       -      +
    133C  CYS*     1.3    75.0    -      -       -      +
    135C  VAL*     1.3    62.1    +      -       -      +
    136C  TYR*     3.1     2.4    +      -       -      -
    176C  ILE*     4.7     6.3    -      -       -      -
    179C  PHE*     4.3     2.0    -      -       -      -
    180C  PHE*     3.6    46.9    -      -       -      -
    183C  HIS*     4.5     4.0    -      -       -      -
    401C  HEM      4.3    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 135 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  PHE*     3.3    28.5    +      -       +      -
     65C  VAL*     4.4    14.1    -      -       +      +
     79C  ARG*     4.3    12.8    -      -       -      +
    131C  GLY      4.2     0.4    -      -       -      +
    132C  TYR      3.6    10.3    -      -       -      +
    134C  CYS*     1.3    77.7    -      -       -      +
    136C  TYR*     1.3    65.7    +      -       -      +
    137C  GLY      3.9     6.1    -      -       -      +
    140C  SER*     3.6     8.5    -      -       -      +
    256C  ASN*     3.9    28.9    -      -       +      +
    401C  HEM      3.3    48.9    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il