Contacts of the helix formed by residues 24 - 50 (chain D) in PDB entry 4NFT


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 SER 24 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  ASP*     3.9     1.6    -      -       -      -
     23D  ILE*     1.3    76.4    -      -       -      +
     25D  SER*     1.3    60.3    +      -       -      +
     26D  LYS*     3.5     4.6    +      -       -      +
     27D  ALA*     3.2    21.5    +      -       -      +
     28D  MET*     3.0    26.5    +      -       -      +
    160D  ARG*     3.4    39.2    -      -       -      +
    161D  ILE      3.0    14.6    +      -       -      -
    162D  THR*     4.3     6.7    -      -       -      -
    163D  PRO*     3.7    10.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 25 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  LYS*     6.0     0.9    -      -       -      +
     19C  PRO*     3.9    23.9    +      -       -      +
     20C  ASP*     2.9    31.7    +      -       -      +
     23D  ILE      3.8     0.6    +      -       -      -
     24D  SER*     1.3    73.5    -      -       -      +
     26D  LYS*     1.3    62.3    +      -       -      +
     28D  MET*     3.5     7.0    +      -       -      +
     29D  GLY*     3.2    17.7    +      -       -      -
      8E  VAL*     5.2     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 26 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  ASP*     5.5     0.4    -      -       -      -
     24D  SER*     3.3     4.3    +      -       -      +
     25D  SER*     1.3    76.6    -      -       -      +
     27D  ALA*     1.3    64.8    +      -       -      +
     29D  GLY*     3.1     3.1    +      -       -      -
     30D  ILE*     3.0    25.3    +      -       +      +
    163D  PRO*     4.1    15.9    -      -       +      -
      8E  VAL*     3.7    27.3    -      -       +      +
     12E  TYR*     2.8    48.7    +      -       +      +
     15E  LYS*     5.4     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 27 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  ILE*     3.6    13.0    -      -       +      -
     24D  SER*     3.2    18.2    +      -       -      +
     26D  LYS*     1.3    78.0    -      -       -      +
     28D  MET*     1.3    56.3    +      -       -      +
     30D  ILE*     3.1     6.3    +      -       -      +
     31D  MET*     3.0    30.0    +      -       -      +
    161D  ILE*     3.6    19.5    -      -       +      +
    162D  THR      3.8    17.3    -      -       -      +
    163D  PRO*     3.9     6.5    -      -       -      +
    166D  LEU*     3.6    14.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 28 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11C  TYR*     4.7     7.0    -      -       +      +
      7D  SER*     3.4    52.5    -      -       -      +
     10D  VAL*     3.8    20.4    -      -       +      -
     11D  TYR*     4.0    20.9    -      -       +      +
     14D  LEU*     5.8     0.2    -      -       +      -
     23D  ILE*     3.6    32.5    -      -       +      +
     24D  SER      3.0    17.1    +      -       -      +
     25D  SER*     3.7     7.4    -      -       -      +
     27D  ALA*     1.3    72.7    -      -       -      +
     29D  GLY*     1.3    56.3    +      -       -      +
     31D  MET*     3.1     3.3    +      -       -      +
     32D  ASN*     2.8    33.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 29 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7D  SER*     5.6     0.7    -      -       -      -
     25D  SER      3.2     7.4    +      -       -      -
     26D  LYS      3.1     8.1    +      -       -      -
     28D  MET*     1.3    79.2    -      -       -      +
     30D  ILE*     1.3    61.2    +      -       -      +
     32D  ASN*     3.2    10.2    +      -       -      +
     33D  SER*     3.1    25.1    +      -       -      -
      7E  GLU*     5.9     1.6    -      -       -      +
      8E  VAL*     3.4    20.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 30 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26D  LYS*     3.0    12.4    +      -       +      +
     27D  ALA      3.1     8.0    +      -       -      +
     29D  GLY*     1.3    73.5    -      -       -      +
     31D  MET*     1.3    62.6    +      -       -      +
     33D  SER*     3.1     6.1    +      -       -      -
     34D  PHE*     2.9    26.4    +      -       +      +
    163D  PRO*     4.0    18.8    -      -       +      -
    166D  LEU*     3.8    16.8    -      -       +      -
      8E  VAL*     4.1    14.1    -      -       +      -
      9E  GLY      3.9    15.9    -      -       -      +
     10E  LEU*     4.1     4.7    -      -       +      +
     12E  TYR*     3.8    34.8    -      -       +      -
     13E  LEU*     4.0    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 31 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10D  VAL*     4.1    17.5    -      -       +      -
     23D  ILE*     4.2     8.3    -      -       +      -
     27D  ALA      3.0    16.9    +      -       -      +
     28D  MET*     3.1     8.2    +      -       -      +
     30D  ILE*     1.3    77.5    -      -       -      +
     32D  ASN*     1.3    57.6    +      -       -      +
     34D  PHE*     3.3    33.0    +      -       +      +
     35D  VAL*     3.0    34.7    +      -       +      +
    142D  THR*     4.2    24.7    -      -       +      -
    145D  VAL*     3.8    30.3    -      -       +      -
    146D  LEU*     4.2    19.1    -      -       +      -
    166D  LEU*     3.9    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 32 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5D  SER*     4.3    11.1    +      -       -      +
      6D  TYR*     2.8    33.1    +      -       -      +
      7D  SER*     4.0    14.8    +      -       -      +
     10D  VAL*     5.1     4.2    -      -       -      +
     28D  MET      2.8    13.8    +      -       -      +
     29D  GLY*     3.3    13.1    +      -       -      +
     30D  ILE      3.2     0.2    -      -       -      -
     31D  MET*     1.3    77.7    -      -       -      +
     33D  SER*     1.3    62.5    +      -       -      +
     35D  VAL*     3.4     5.2    +      -       -      +
     36D  ASN*     3.0    43.7    +      -       -      +
      7E  GLU*     5.9     4.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 33 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  GLY      3.1     6.4    +      -       -      -
     30D  ILE      3.5     7.6    -      -       -      -
     32D  ASN*     1.3    77.2    +      -       -      +
     34D  PHE*     1.3    55.6    +      -       -      +
     36D  ASN*     3.2     6.1    +      -       -      +
     37D  ASP*     2.8    49.3    +      -       -      -
      7E  GLU*     4.5     9.9    -      -       -      +
      8E  VAL      2.8    23.4    +      -       -      -
      9E  GLY*     3.4    20.6    -      -       -      -
     10E  LEU*     3.9     7.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 34 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  ILE*     2.9    14.4    +      -       +      +
     31D  MET*     3.4    34.8    -      -       +      +
     33D  SER*     1.3    76.7    -      -       -      +
     35D  VAL*     1.3    69.0    +      -       +      +
     37D  ASP*     4.6     0.2    -      -       -      +
     38D  ILE*     3.2    59.9    +      -       +      +
    138D  LEU      5.5     0.2    -      -       -      -
    141D  LEU*     3.9    18.4    -      -       +      -
    142D  THR*     4.1    22.0    -      -       -      -
    145D  VAL*     4.0    17.5    -      -       +      -
    170D  ILE*     5.4     3.4    -      -       +      -
    179D  LEU*     4.0     7.9    -      -       +      -
    180D  ILE*     4.0    24.5    -      -       +      -
     10E  LEU*     3.6    29.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 35 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  TYR*     3.8    29.4    -      -       +      -
     10D  VAL*     4.2    12.8    -      -       +      -
     31D  MET*     3.0    17.2    +      -       +      +
     32D  ASN      3.9     3.4    -      -       -      +
     34D  PHE*     1.3    81.9    -      -       +      +
     36D  ASN*     1.3    64.5    +      -       -      +
     38D  ILE*     4.0     2.4    -      -       -      +
     39D  PHE*     3.1    23.3    +      -       +      +
    107D  PHE*     3.8    28.0    -      -       +      -
    138D  LEU*     4.4    16.6    -      -       +      +
    142D  THR*     3.7    23.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 36 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5D  SER      4.7     7.5    +      -       -      +
      6D  TYR*     3.7    22.8    -      -       -      -
     32D  ASN*     3.0    47.3    +      -       -      +
     33D  SER*     3.7     5.1    -      -       -      +
     35D  VAL*     1.3    76.5    -      -       -      +
     37D  ASP*     1.3    64.1    +      -       -      +
     39D  PHE*     3.2     8.1    +      -       -      +
     40D  GLU*     2.8    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 37 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  SER*     2.8    35.9    +      -       -      +
     36D  ASN*     1.3    75.7    -      -       -      +
     38D  ILE*     1.3    64.5    +      -       -      +
     40D  GLU*     3.8    16.1    -      -       -      +
     41D  ARG*     3.1    26.9    +      -       -      +
    183D  THR*     3.8    21.7    -      -       +      +
      9E  GLY*     5.6     0.5    -      -       -      -
     10E  LEU*     4.2    16.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 38 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34D  PHE*     3.2    58.2    +      -       +      +
     35D  VAL*     4.0     1.8    -      -       -      +
     37D  ASP*     1.3    76.5    -      -       -      +
     39D  PHE*     1.3    59.3    +      -       -      +
     41D  ARG*     3.3     3.3    +      -       -      +
     42D  ILE*     2.9    48.2    +      -       +      +
     70D  LEU*     4.0    12.7    -      -       +      +
    138D  LEU*     3.9    14.8    -      -       +      -
    141D  LEU*     4.2    14.1    -      -       +      -
    179D  LEU*     4.0    17.5    -      -       +      -
    183D  THR*     4.0    22.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 39 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6D  TYR*     4.0    24.0    -      +       +      -
     35D  VAL*     3.1    20.1    +      -       +      +
     36D  ASN*     3.5     6.5    -      -       -      +
     38D  ILE*     1.3    76.1    -      -       -      +
     40D  GLU*     1.3    59.9    +      -       -      +
     42D  ILE*     4.5     8.1    -      -       +      +
     43D  ALA*     2.8    46.6    +      -       +      +
    112D  ILE*     3.7    38.8    -      -       +      -
    115D  HIS*     3.3    40.6    -      +       +      -
    116D  LEU*     4.2    11.0    -      -       +      -
    134D  SER*     4.5     9.4    -      -       -      -
    138D  LEU*     3.7    27.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 40 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36D  ASN*     2.8    18.9    +      -       -      +
     37D  ASP*     3.8    19.3    -      -       -      +
     38D  ILE      3.3     0.2    -      -       -      -
     39D  PHE*     1.3    73.9    -      -       -      +
     41D  ARG*     1.3    60.8    +      -       -      +
     44D  GLY*     3.1    20.4    +      -       -      -
    115D  HIS*     5.0     5.2    -      -       +      +
    119D  ARG*     3.5    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 41 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  ASP      3.1    13.0    +      -       -      +
     38D  ILE      3.6     8.1    -      -       -      +
     40D  GLU*     1.3    76.4    -      -       +      +
     42D  ILE*     1.3    66.5    +      -       -      +
     44D  GLY*     4.0     0.6    -      -       -      -
     45D  GLU*     3.1    35.5    +      -       -      +
     69D  LEU*     4.6    11.3    +      -       -      +
     70D  LEU*     4.3    28.5    -      -       +      +
    182D  ALA*     2.8    31.7    +      -       -      +
    183D  THR*     4.0    11.3    -      -       +      +
    186D  GLY*     3.1    38.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 42 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38D  ILE*     2.9    38.0    +      -       +      +
     39D  PHE*     4.0     9.9    -      -       +      +
     41D  ARG*     1.3    76.3    -      -       -      +
     43D  ALA*     1.3    59.7    +      -       -      +
     45D  GLU*     4.8     0.2    -      -       -      -
     46D  ALA*     2.9    28.8    +      -       -      +
     63D  ILE*     4.3    20.4    -      -       +      -
     66D  ALA*     3.6    16.5    -      -       +      +
     67D  VAL*     3.8    40.4    -      -       +      +
     70D  LEU*     4.4    13.9    -      -       +      -
     71D  LEU*     5.3     2.2    -      -       +      -
    134D  SER*     5.3     3.1    -      -       -      +
    137D  ILE*     4.6    12.3    -      -       +      -
    138D  LEU*     4.8     6.5    -      -       +      -
    141D  LEU*     5.5     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 43 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  PHE*     2.8    32.9    +      -       +      +
     42D  ILE*     1.3    75.9    -      -       -      +
     44D  GLY*     1.3    62.8    +      -       -      +
     46D  ALA*     3.9     2.8    -      -       -      +
     47D  SER*     3.1    25.8    +      -       -      -
     58D  ILE*     5.0     1.7    -      -       -      +
    115D  HIS*     4.3     6.1    -      -       +      -
    116D  LEU*     4.0    22.2    -      -       +      -
    119D  ARG*     3.8    29.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 44 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40D  GLU      3.1    15.5    +      -       -      -
     41D  ARG      4.0     0.4    -      -       -      -
     43D  ALA*     1.3    75.6    -      -       -      +
     45D  GLU*     1.3    61.0    +      -       -      +
     47D  SER*     3.0    21.2    +      -       -      -
     48D  ARG*     3.2    11.4    +      -       -      +
    119D  ARG*     3.5    24.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 45 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41D  ARG*     3.1    28.1    +      -       -      +
     42D  ILE*     3.8     2.7    -      -       -      +
     44D  GLY*     1.3    72.6    -      -       -      +
     46D  ALA*     1.3    61.1    +      -       -      +
     48D  ARG*     3.1    43.8    +      -       -      +
     49D  LEU*     2.9    32.4    +      -       +      +
     66D  ALA*     3.9    15.0    -      -       +      +
     69D  LEU*     3.8    32.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 46 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42D  ILE      2.9    19.2    +      -       -      +
     43D  ALA*     3.9     3.6    -      -       -      +
     45D  GLU*     1.3    77.6    -      -       -      +
     47D  SER*     1.3    56.6    +      -       -      +
     49D  LEU*     3.2     4.3    +      -       -      +
     50D  ALA*     2.9    31.3    +      -       -      +
     58D  ILE*     4.2     9.2    -      -       +      -
     62D  GLU*     3.8    29.2    -      -       -      +
     63D  ILE*     4.0    24.0    -      -       +      +
     66D  ALA*     3.8     3.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 47 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43D  ALA      3.1    14.7    +      -       -      -
     44D  GLY*     3.0    14.0    +      -       -      -
     46D  ALA*     1.3    72.7    -      -       -      +
     48D  ARG*     1.3    69.4    +      -       -      +
     50D  ALA*     3.1     2.4    +      -       -      +
     51D  HIS*     3.0    22.7    +      -       -      +
     56D  SER      5.3     0.7    -      -       -      +
     58D  ILE*     3.7    27.5    -      -       -      +
    119D  ARG*     3.8    25.4    +      -       -      +
    120D  THR*     5.2     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 48 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44D  GLY      3.2     9.5    +      -       -      +
     45D  GLU*     3.1    33.0    +      -       -      +
     47D  SER*     1.3    82.3    +      -       -      +
     49D  LEU*     1.3    79.3    +      -       -      +
     51D  HIS*     3.1    22.3    +      -       -      +
     52D  TYR*     5.7     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 49 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45D  GLU*     2.9    31.2    +      -       +      +
     46D  ALA      3.2     5.1    +      -       -      +
     48D  ARG*     1.3    96.7    -      -       -      +
     50D  ALA*     1.3    56.9    +      -       -      +
     51D  HIS      3.3     1.5    +      -       -      -
     52D  TYR*     4.7     2.4    +      -       -      +
     53D  ASN*     4.8     3.6    -      -       -      +
     62D  GLU*     3.8    31.8    -      -       +      +
     65D  THR*     3.2    30.1    -      -       +      +
     66D  ALA*     4.0     7.6    -      -       -      +
     69D  LEU*     4.6     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 50 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46D  ALA      2.9    16.9    +      -       -      +
     47D  SER      3.6     4.5    -      -       -      +
     48D  ARG      3.1     0.4    -      -       -      -
     49D  LEU*     1.3    76.8    -      -       -      +
     51D  HIS*     1.3    65.3    +      -       -      +
     52D  TYR      3.1     3.1    -      -       -      -
     53D  ASN*     3.0    22.3    +      -       -      +
     56D  SER*     3.3    18.4    -      -       -      +
     57D  THR      3.2    29.2    -      -       -      +
     58D  ILE*     3.9     8.3    -      -       +      -
     62D  GLU*     3.8     7.2    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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