Contacts of the helix formed by residues 38 - 64 (chain T) in PDB entry 1BFR


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 LYS 38 (chain T).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39R  ARG*     5.1     9.5    -      -       -      +
    157R  GLU*     3.0    28.7    +      -       -      +
     33T  LYS*     5.4     6.7    -      -       +      +
     36T  GLY*     3.0    18.3    +      -       -      +
     37T  LEU*     1.3    70.1    -      -       -      +
     39T  ARG*     1.3    63.8    +      -       -      +
     41T  ASN*     3.1     9.1    +      -       -      +
     42T  ASP*     3.0    28.7    +      -       -      +
    153T  GLN      3.1     5.9    +      -       -      +
    154T  ILE      3.0    23.0    +      -       -      +
    156T  GLU*     3.6    32.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 39 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38N  LYS*     5.0     9.7    -      -       -      +
    154N  ILE*     5.9     9.0    -      -       -      +
    155N  ARG*     3.2    25.6    -      -       -      +
     38T  LYS*     1.3    72.0    -      -       -      +
     40T  LEU*     1.3    70.4    +      -       -      +
     42T  ASP*     3.2     5.4    +      -       -      +
     43T  VAL*     3.1    32.9    +      -       +      +
    133T  TRP*     3.9    13.9    -      -       -      +
    137T  GLU*     3.1    39.4    +      -       -      -
    152T  ALA*     4.0     1.6    -      -       -      -
    153T  GLN*     2.6    56.1    +      -       -      +
    155T  ARG      3.7    13.3    +      -       -      +
    156T  GLU*     4.5     7.6    -      -       +      +
    157T  GLU*     4.2    24.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 40 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32T  PHE*     3.7    38.1    -      -       +      -
     37T  LEU*     3.1    15.7    +      -       +      +
     39T  ARG*     1.3    85.7    -      -       -      +
     41T  ASN*     1.3    65.1    +      -       -      +
     43T  VAL*     4.7     1.6    -      -       -      +
     44T  GLU*     3.0    30.0    +      -       -      +
     83T  VAL*     4.2    12.1    -      -       +      -
     87T  LEU*     5.0     3.1    -      -       +      -
    133T  TRP*     4.1    20.6    -      -       +      -
    149T  TYR*     3.6    26.9    -      -       +      +
    150T  LEU*     5.7     0.2    -      -       +      -
    153T  GLN*     3.5    38.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 41 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29T  ALA*     3.1    32.9    -      -       -      +
     30T  ARG*     2.9    27.7    +      -       -      +
     32T  PHE*     3.7     1.4    -      -       -      +
     33T  LYS*     3.4    38.4    -      -       +      +
     37T  LEU      3.0     9.4    +      -       -      +
     38T  LYS*     3.4    10.0    -      -       -      +
     40T  LEU*     1.3    76.1    -      -       -      +
     42T  ASP*     1.3    76.4    +      -       -      +
     45T  TYR*     2.9    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 42 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38T  LYS*     3.0    15.4    +      -       -      +
     39T  ARG*     3.2     5.3    +      -       -      +
     41T  ASN*     1.3    90.9    +      -       -      +
     43T  VAL*     1.3    61.2    +      -       +      +
     45T  TYR*     3.8     3.3    -      -       -      +
     46T  HIS*     2.7    44.6    +      -       +      +
    156T  GLU*     3.3    36.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 43 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39T  ARG*     3.1    27.8    +      -       +      +
     40T  LEU      4.4     0.9    -      -       -      +
     42T  ASP*     1.3    74.5    -      -       +      +
     44T  GLU*     1.3    62.7    +      -       -      +
     46T  HIS*     3.2     9.2    +      -       +      +
     47T  GLU*     3.0    29.5    +      -       +      +
    133T  TRP*     3.5    55.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 44 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25T  TYR*     3.5    25.4    -      -       -      +
     28T  HIS*     3.3    19.9    -      -       -      +
     29T  ALA*     3.9    18.8    -      -       +      +
     32T  PHE*     3.8    18.3    -      -       +      -
     40T  LEU      3.0    18.8    +      -       -      +
     43T  VAL*     1.3    74.5    -      -       -      +
     45T  TYR*     1.3    64.2    +      -       -      +
     47T  GLU*     3.1     8.1    +      -       -      +
     48T  SER*     2.9    21.8    +      -       -      -
     87T  LEU*     4.6     2.5    -      -       -      -
     90T  ASP*     2.8    28.5    -      -       -      +
    133T  TRP*     3.5    27.5    -      -       +      -
    134T  LEU*     4.1     3.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 45 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26T  PHE*     3.6    33.0    -      +       -      -
     29T  ALA*     3.5    11.2    -      -       +      +
     30T  ARG*     3.7    29.2    -      -       -      +
     41T  ASN*     2.9    20.8    +      -       -      +
     42T  ASP*     3.8     3.1    -      -       -      +
     44T  GLU*     1.3    74.8    -      -       -      +
     46T  HIS*     1.3    83.3    +      +       -      +
     48T  SER*     3.1     8.7    -      -       -      -
     49T  ILE*     3.0    44.2    +      -       +      +
    200T  HEM      3.6    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 46 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42T  ASP*     2.7    35.2    +      -       +      +
     43T  VAL*     3.7     8.7    -      -       +      +
     45T  TYR*     1.3    96.1    -      +       -      +
     47T  GLU*     1.3    64.7    +      -       +      +
     49T  ILE*     3.1    11.0    +      -       +      +
     50T  ASP*     2.9    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 47 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25T  TYR*     3.2    39.0    +      -       +      -
     43T  VAL*     3.0    21.6    +      -       +      +
     44T  GLU*     3.1    10.3    +      -       -      +
     46T  HIS*     1.3    74.4    -      -       +      +
     48T  SER*     1.3    63.1    +      -       -      +
     50T  ASP*     3.2     6.6    +      -       -      +
     51T  GLU*     3.0    28.6    +      -       -      +
    130T  HIS*     3.5    44.1    -      -       +      +
    133T  TRP*     3.8    32.5    -      -       -      +
    134T  LEU*     4.6     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 48 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22T  ILE*     3.2    20.9    +      -       -      +
     25T  TYR*     3.9     9.4    -      -       -      +
     26T  PHE*     3.4    28.2    -      -       -      -
     44T  GLU      2.9    11.8    +      -       -      -
     45T  TYR*     3.1    12.3    -      -       -      -
     47T  GLU*     1.3    74.6    -      -       -      +
     49T  ILE*     1.3    62.4    +      -       -      +
     51T  GLU*     3.1     8.3    +      -       -      +
     52T  MET*     3.0    41.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 49 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45T  TYR*     3.0    55.6    +      -       +      +
     46T  HIS*     3.1    12.3    +      -       +      +
     48T  SER*     1.3    74.5    -      -       -      +
     50T  ASP*     1.3    61.6    +      -       -      +
     52T  MET*     3.2    24.7    -      -       +      +
     53T  LYS*     2.9    31.4    +      -       -      +
    200T  HEM      3.8    53.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 50 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46T  HIS*     2.9    22.3    +      -       -      +
     47T  GLU*     3.2     9.7    +      -       -      +
     49T  ILE*     1.3    72.4    -      -       -      +
     51T  GLU*     1.3    58.5    +      -       -      +
     53T  LYS*     3.4    16.1    +      -       -      +
     54T  HIS*     2.9    41.5    +      -       +      +
    126T  ASP*     5.1     6.9    -      -       -      +
    130T  HIS*     2.8    33.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 51 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18T  GLU*     2.8    12.0    -      -       -      +
     21T  ALA*     3.9    14.8    -      -       +      +
     22T  ILE*     3.6    23.2    -      -       +      +
     25T  TYR*     3.6    10.6    -      -       +      -
     47T  GLU      3.0    14.5    +      -       -      +
     48T  SER      3.1     3.1    +      -       -      +
     50T  ASP*     1.3    71.8    -      -       -      +
     52T  MET*     1.3    61.3    +      -       -      +
     54T  HIS*     2.8    15.1    +      -       -      +
     55T  ALA*     2.8    31.0    +      -       -      +
     94T  GLU*     3.2     6.9    -      -       -      +
    127T  GLU*     2.9     2.6    -      -       -      +
    130T  HIS*     3.4     5.0    +      -       -      -
    201T   MN      2.0    34.8    +      -       -      -
    202T   MN      2.0    34.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 52 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22T  ILE*     3.6    22.2    -      -       +      +
     26T  PHE*     4.1     4.0    -      -       +      -
     48T  SER*     3.0    33.7    +      -       -      +
     49T  ILE*     3.2    24.5    -      -       +      +
     51T  GLU*     1.3    75.2    -      -       -      +
     53T  LYS*     1.3    57.7    +      -       -      +
     55T  ALA*     3.2     3.3    +      -       -      +
     56T  ASP*     2.9    27.0    +      -       -      +
    200T  HEM      2.2   100.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 53 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49T  ILE*     2.9    27.1    +      -       -      +
     50T  ASP*     3.6    18.0    +      -       -      +
     52T  MET*     1.3    73.2    -      -       -      +
     54T  HIS*     1.3    63.5    +      -       +      +
     56T  ASP*     3.4     8.8    +      -       -      +
     57T  ARG*     3.1    25.5    +      -       -      +
    200T  HEM      3.5    44.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 54 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18T  GLU*     3.6    15.5    -      -       +      +
     50T  ASP*     2.9    27.5    +      -       +      +
     51T  GLU*     2.8    11.9    +      -       -      +
     53T  LYS*     1.3    73.5    -      -       +      +
     55T  ALA*     1.3    65.8    +      -       -      +
     57T  ARG*     3.0    24.5    +      -       -      +
     58T  TYR*     3.1    17.5    +      -       +      -
    123T  ILE*     3.6    29.1    -      -       +      +
    126T  ASP*     2.8    39.1    +      -       +      -
    127T  GLU*     3.1    18.4    -      -       -      -
    130T  HIS*     4.9     0.7    -      +       -      -
    202T   MN      2.5    23.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 55 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15T  LEU*     3.8    21.9    -      -       +      +
     18T  GLU*     4.2     7.7    -      -       +      +
     19T  LEU*     4.6     3.4    -      -       +      -
     22T  ILE*     4.0    13.5    -      -       +      -
     51T  GLU      2.8    16.9    +      -       -      +
     52T  MET      3.4     9.0    -      -       -      +
     54T  HIS*     1.3    69.0    -      -       -      +
     56T  ASP*     1.3    58.6    +      -       -      +
     58T  TYR*     3.2     8.6    +      -       -      +
     59T  ILE*     2.9    34.1    +      -       +      +
    200T  HEM      4.0    14.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 56 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26S  PHE*     3.4    25.5    -      -       +      -
     30S  ARG*     2.9    45.1    +      -       -      +
     52T  MET      2.9    13.3    +      -       -      +
     53T  LYS*     3.5    12.6    -      -       -      +
     55T  ALA*     1.3    75.3    -      -       -      +
     57T  ARG*     1.3    60.8    +      -       +      +
     59T  ILE*     3.5     1.9    +      -       -      +
     60T  GLU*     3.0    34.4    +      -       -      +
    200T  HEM      4.3     9.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 57 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53T  LYS*     3.1    14.7    +      -       -      +
     54T  HIS*     3.0    16.3    +      -       -      +
     56T  ASP*     1.3    73.8    -      -       +      +
     58T  TYR*     1.3    62.6    +      -       -      +
     60T  GLU*     3.4     4.6    +      -       -      +
     61T  ARG*     3.0    23.7    +      -       -      +
    119T  MET*     3.6    39.6    -      -       +      +
    122T  GLU*     3.0    49.2    +      -       -      +
    123T  ILE*     4.1    18.9    -      -       +      +
    126T  ASP*     5.8     1.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 58 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11T  LEU*     4.2    20.2    -      -       +      +
     14T  LEU*     3.8    30.0    -      -       +      +
     15T  LEU*     4.0    26.9    -      -       +      -
     18T  GLU*     3.7    26.6    +      -       +      -
     54T  HIS      3.1    20.8    +      -       -      -
     55T  ALA*     3.7     4.3    -      -       -      +
     57T  ARG*     1.3    73.1    -      -       -      +
     59T  ILE*     1.4    58.7    +      -       -      +
     61T  ARG*     3.1     4.8    +      -       -      -
     62T  ILE*     2.9    38.9    +      -       +      +
    101T  LEU*     3.7    22.9    -      -       -      +
    119T  MET*     3.5    27.6    -      -       +      -
    120T  MET*     4.4     3.1    -      -       +      +
    123T  ILE*     3.5    27.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 59 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26S  PHE*     3.8    28.7    -      -       +      -
     27S  LEU*     4.0     9.2    -      -       +      +
     30S  ARG*     3.9    18.2    -      -       +      -
     15T  LEU*     4.0    18.8    -      -       +      -
     55T  ALA      2.9    25.5    +      -       -      +
     56T  ASP*     3.8     4.9    -      -       -      +
     58T  TYR*     1.4    71.8    -      -       -      +
     60T  GLU*     1.3    62.8    +      -       -      +
     62T  ILE*     3.5     0.8    +      -       -      +
     63T  LEU*     3.1    41.2    +      -       +      +
     69T  PRO*     3.8    18.7    -      -       +      +
     71T  LEU*     3.9    26.2    -      -       +      -
    200T  HEM      4.4     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 60 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30S  ARG*     3.2    26.1    +      -       +      +
     33S  LYS*     3.4    30.4    +      -       -      -
     56T  ASP*     3.0    42.7    +      -       -      +
     57T  ARG*     3.9     4.7    -      -       -      +
     59T  ILE*     1.3    77.2    -      -       -      +
     61T  ARG*     1.3    60.9    +      -       -      +
     63T  LEU*     3.5     5.9    +      -       -      +
     64T  PHE*     3.1    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 61 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128K  GLU*     3.0    32.5    +      -       -      +
      1T  MET*     5.0     0.6    -      -       -      +
     11T  LEU*     3.9    19.7    -      -       +      -
     57T  ARG      3.0    17.9    +      -       -      +
     58T  TYR      3.8     2.7    -      -       -      +
     60T  GLU*     1.3    74.4    -      -       -      +
     62T  ILE*     1.3    63.8    +      -       -      +
     64T  PHE*     3.2    26.6    +      -       -      +
     65T  LEU*     2.9    42.8    +      -       +      +
    113T  ASP*     3.1    24.9    +      -       -      -
    115T  VAL*     3.7    15.5    -      -       -      +
    116T  SER*     3.0    21.4    +      -       -      +
    119T  MET*     4.0    26.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 62 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8T  ILE*     4.0    12.1    -      -       +      +
     11T  LEU*     3.7    27.6    -      -       +      +
     12T  ASN*     3.6    38.1    -      -       -      +
     15T  LEU*     4.2    10.3    -      -       +      -
     58T  TYR      2.9    28.8    +      -       -      +
     59T  ILE      4.0     2.9    -      -       -      +
     61T  ARG*     1.3    70.0    -      -       -      +
     63T  LEU*     1.3    61.9    +      -       -      +
     65T  LEU*     3.3     7.2    +      -       -      +
     66T  GLU      3.2     4.5    +      -       -      -
     67T  GLY*     2.9    50.6    +      -       -      -
     68T  LEU      3.7    15.0    -      -       -      +
     69T  PRO*     3.7     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 63 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27S  LEU*     4.5     0.9    -      -       +      -
     30S  ARG*     3.9    31.0    -      -       +      +
     31S  MET*     4.1    21.3    -      -       +      +
     34S  ASN*     3.9    29.9    +      -       +      +
     59T  ILE*     3.1    41.5    +      -       +      +
     60T  GLU*     3.7     5.4    -      -       -      +
     62T  ILE*     1.3    74.8    -      -       -      +
     64T  PHE*     1.3    62.0    +      -       -      +
     66T  GLU*     3.0    16.6    +      -       -      +
     67T  GLY      4.0     9.1    -      -       -      +
     68T  LEU*     5.8     1.8    -      -       +      -
     69T  PRO*     3.4    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 64 (chain T). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128K  GLU*     3.8    23.3    -      -       +      -
    131K  ILE*     4.7     1.8    -      -       +      -
    132K  ASP*     3.7    46.0    -      -       +      +
    135K  GLU*     4.0    12.1    -      -       -      -
     34S  ASN*     4.2     9.7    +      -       -      +
      1T  MET*     2.9    71.6    +      -       +      +
     60T  GLU      3.1    13.9    +      -       -      +
     61T  ARG*     3.2    38.6    -      -       -      +
     63T  LEU*     1.3    74.6    -      -       -      +
     65T  LEU*     1.3    62.1    +      -       +      +
     66T  GLU*     3.0     4.6    +      -       -      +
----------------------------------------------------------
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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