Contacts of the helix formed by residues 55 - 77 (chain A) in PDB entry 2CUY


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 LEU 55 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  GLU      3.3     7.6    +      -       -      +
     52A  ALA*     3.3    21.3    -      -       +      +
     53A  LEU      3.1     1.2    -      -       -      +
     54A  THR*     1.3    74.3    -      -       -      +
     56A  THR*     1.3    67.0    +      -       -      +
     57A  GLU*     3.1     7.2    -      -       +      +
     58A  ASN*     2.7    28.6    +      -       -      +
     59A  GLN      2.8    11.6    +      -       -      -
    119A  GLN*     6.6     0.2    -      -       +      -
    133B  LEU*     3.8    16.2    -      -       +      -
    134B  LYS*     4.9     4.3    -      -       -      +
    183B  ARG*     3.6    49.4    -      -       +      +
    184B  VAL      4.4    10.5    -      -       -      +
    185B  VAL*     4.1    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 56 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  GLN*     3.3    35.4    +      -       -      +
     54A  THR      3.1     6.6    +      -       -      -
     55A  LEU*     1.3    70.9    -      -       -      +
     57A  GLU*     1.3    61.5    +      -       -      +
     58A  ASN      3.2     1.0    +      -       -      -
     59A  GLN*     4.3     1.3    -      -       -      -
     60A  GLN*     3.2    37.4    +      -       -      +
    115A  GLY*     3.6    21.9    -      -       -      +
    119A  GLN*     3.0    29.9    +      -       +      +
    193A  PHE*     4.0    15.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 57 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  LEU*     2.9     4.9    +      -       +      +
     56A  THR*     1.3    79.4    -      -       -      +
     58A  ASN*     1.3    74.1    +      -       -      +
     61A  PRO*     3.3    12.0    -      -       -      +
    112A  ARG*     3.2    54.2    +      -       +      +
    115A  GLY*     4.2     1.3    -      -       -      -
    116A  ARG*     3.5    39.8    -      -       +      +
    119A  GLN*     6.4     0.2    -      -       +      -
    183B  ARG*     2.9    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 58 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41A  LEU*     4.3     2.9    -      -       +      +
     44A  LEU*     3.5    27.7    -      -       +      +
     52A  ALA*     2.8    23.1    +      -       -      +
     53A  LEU*     3.6    11.9    -      -       +      +
     55A  LEU*     2.7    26.4    +      -       -      +
     57A  GLU*     1.3    84.7    +      -       -      +
     59A  GLN*     1.3    68.4    +      -       -      +
     60A  GLN      3.3     1.1    -      -       -      -
     61A  PRO*     3.0    18.3    -      -       -      +
     62A  ALA*     3.0    14.5    +      -       -      +
    112A  ARG*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 59 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  GLN*     2.8    32.7    -      -       -      +
     10A  GLY      2.6    29.3    +      -       -      -
     12A  HIS*     3.4    37.3    -      -       +      +
     53A  LEU*     3.1    14.5    +      -       -      +
     54A  THR*     3.0    23.2    +      -       -      +
     55A  LEU      2.8     8.8    +      -       -      +
     56A  THR*     3.9     3.5    -      -       -      +
     58A  ASN*     1.3    78.0    -      -       -      +
     60A  GLN*     1.3    57.4    +      -       -      +
     62A  ALA*     3.2     6.8    +      -       -      +
     63A  LEU*     2.9    40.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  GLN*     3.0    33.6    +      -       +      +
     56A  THR*     3.2    23.5    +      -       -      +
     59A  GLN*     1.3    80.2    -      -       -      +
     61A  PRO*     1.3    70.3    -      -       +      +
     63A  LEU*     3.4     1.3    +      -       -      -
     64A  LEU*     3.2    19.8    +      -       -      +
     90A  LEU*     3.7    34.9    -      -       +      +
    111A  VAL*     3.3    19.6    -      -       +      +
    114A  ARG*     2.8    41.8    +      -       -      +
    115A  GLY*     3.5    12.2    -      -       -      -
    118A  MET*     3.6     5.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  LEU*     3.6    31.9    -      -       +      -
     41A  LEU*     4.3     9.4    -      -       +      -
     57A  GLU      3.3    24.2    -      -       -      +
     58A  ASN*     3.0    21.5    -      -       -      +
     60A  GLN*     1.3    91.2    -      -       +      +
     62A  ALA*     1.3    59.5    +      -       -      +
     64A  LEU*     4.5     0.4    -      -       +      -
     65A  ALA*     3.0    21.8    +      -       -      +
    108A  LEU*     3.2    19.8    -      -       +      +
    111A  VAL*     3.7    16.4    -      -       +      -
    112A  ARG*     4.2    11.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  HIS*     5.5     0.2    -      -       +      -
     16A  MET*     3.6    11.0    -      -       +      +
     41A  LEU*     4.1     4.4    -      -       +      +
     45A  MET*     3.6    36.9    -      -       +      +
     53A  LEU*     3.9    15.5    -      -       +      -
     58A  ASN      3.0    18.5    +      -       -      +
     59A  GLN*     3.4     5.4    -      -       -      +
     61A  PRO*     1.3    78.8    -      -       -      +
     63A  LEU*     1.3    57.6    +      -       -      +
     65A  ALA*     3.4     2.1    +      -       -      +
     66A  ALA*     3.0    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7A  PRO*     4.5    15.3    -      -       +      +
      8A  GLY*     3.4    32.8    -      -       -      +
      9A  GLN*     3.9     3.1    -      -       +      +
     11A  SER*     3.7     9.9    -      -       -      -
     12A  HIS*     3.4    36.1    -      -       +      +
     16A  MET*     3.8     5.4    -      -       +      -
     59A  GLN*     2.9    38.8    +      -       +      +
     60A  GLN*     3.8     7.9    -      -       -      +
     62A  ALA*     1.3    75.2    -      -       -      +
     64A  LEU*     1.3    59.9    +      -       -      +
     66A  ALA*     3.9     1.1    -      -       -      +
     67A  GLY*     2.9    26.3    +      -       -      -
     90A  LEU*     3.9    13.2    -      -       +      -
     94A  THR*     4.5     1.6    +      -       -      +
    269A  GLY*     5.3     0.5    -      -       -      -
    270A  SER*     3.8    11.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  GLN      3.2    15.9    +      -       -      +
     61A  PRO*     3.8     4.9    -      -       +      +
     63A  LEU*     1.3    76.0    -      -       -      +
     65A  ALA*     1.3    66.4    +      -       -      +
     67A  GLY      3.3     0.7    +      -       -      -
     68A  TYR*     2.9    22.3    +      -       +      +
     90A  LEU*     4.1     3.1    -      -       +      +
     93A  TRP*     3.8    17.9    -      -       +      +
     94A  THR*     3.4    45.2    -      -       -      +
     97A  VAL*     4.2    10.3    -      -       +      -
    104A  LEU*     3.7    26.9    -      -       +      -
    107A  ALA*     4.0    16.4    -      -       +      -
    108A  LEU*     3.9    13.9    -      -       +      -
    111A  VAL*     4.2    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  VAL*     3.6    11.0    -      -       +      +
     31A  LEU*     4.0    13.4    -      -       +      +
     34A  ALA*     3.9    28.3    -      -       +      -
     41A  LEU*     4.4     5.6    -      -       +      -
     45A  MET*     4.7     1.3    -      -       -      -
     61A  PRO      3.0    18.5    +      -       -      +
     62A  ALA*     3.8     3.8    -      -       -      +
     64A  LEU*     1.3    81.9    -      -       -      +
     66A  ALA*     1.3    58.1    +      -       -      +
     68A  TYR*     4.9     0.2    -      -       -      -
     69A  ALA*     2.9    29.8    +      -       -      +
    104A  LEU*     4.9     2.9    -      -       +      -
    108A  LEU*     4.0     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16A  MET*     3.9    24.5    -      -       +      -
     17A  GLY*     4.9    10.9    -      -       -      +
     20A  LEU*     5.5     0.3    -      -       -      +
     31A  LEU*     4.5     5.5    -      -       +      +
     45A  MET*     5.5     1.8    -      -       -      -
     62A  ALA      3.0    17.0    +      -       -      +
     63A  LEU      3.9     3.4    -      -       -      +
     65A  ALA*     1.3    73.8    -      -       -      +
     67A  GLY*     1.3    68.3    +      -       -      +
     69A  ALA*     3.3     6.3    +      -       -      +
     70A  ALA*     2.9    26.0    +      -       -      +
    269A  GLY*     3.6    20.0    -      -       -      +
    270A  SER*     4.9     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 67 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  PHE*     4.0     9.4    -      -       -      -
      7A  PRO*     5.5     0.9    -      -       -      -
     63A  LEU      2.9    18.0    +      -       -      -
     64A  LEU      3.7     0.9    -      -       -      -
     66A  ALA*     1.3    79.1    -      -       -      +
     68A  TYR*     1.3    61.6    -      -       -      +
     70A  ALA*     3.3     2.4    +      -       -      +
     71A  TYR*     3.0    22.5    +      -       -      +
     94A  THR*     4.0     8.3    -      -       -      -
    268A  PHE*     3.7    12.8    -      -       -      +
    269A  GLY*     3.6    15.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  PHE*     4.9     0.9    -      -       -      -
     30A  VAL*     3.8    25.6    -      -       +      -
     33A  ARG*     4.4    13.6    +      -       -      -
     64A  LEU      2.9    17.1    +      -       -      +
     65A  ALA      4.1     2.5    -      -       -      +
     67A  GLY*     1.3    75.1    -      -       -      +
     69A  ALA*     1.3    62.3    +      -       -      +
     71A  TYR*     3.2    10.6    +      +       -      +
     72A  ARG*     2.9    72.1    +      -       +      +
     94A  THR*     3.8     7.5    -      -       +      +
     97A  VAL*     3.8    30.7    +      -       +      -
     98A  ALA*     3.7    36.0    +      -       +      -
    104A  LEU*     4.0    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  GLY*     6.1     1.8    -      -       -      -
     20A  LEU*     5.8     2.0    -      -       +      -
     27A  ALA*     3.7    18.6    -      -       +      +
     30A  VAL*     3.7    17.2    -      -       +      +
     31A  LEU*     3.9    26.9    -      -       +      -
     65A  ALA      2.9    20.1    +      -       -      +
     66A  ALA*     3.6     6.1    -      -       -      +
     68A  TYR*     1.3    77.6    -      -       -      +
     70A  ALA*     1.3    58.3    +      -       -      +
     72A  ARG*     3.3     1.6    +      -       -      +
     73A  ALA*     2.9    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.5    25.9    -      -       +      +
     66A  ALA      2.9    11.8    +      -       -      +
     67A  GLY      3.7     1.1    -      -       -      +
     69A  ALA*     1.3    76.4    -      -       -      +
     71A  TYR*     1.3    63.0    +      -       -      +
     73A  ALA*     3.3     3.7    +      -       -      +
     74A  PHE*     3.0    22.7    +      -       -      +
    268A  PHE*     3.8     6.2    -      -       +      -
    269A  GLY*     3.4    29.6    -      -       -      +
    290A  VAL*     3.5    18.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  TYR*     4.0     8.7    -      -       -      -
      4A  ALA*     5.1     0.9    -      -       +      -
      6A  PHE*     4.2    15.0    -      +       +      -
     67A  GLY      3.0    13.9    +      -       -      +
     68A  TYR*     3.5    19.5    -      +       -      +
     70A  ALA*     1.3    76.7    -      -       -      +
     72A  ARG*     1.3    68.7    +      -       -      +
     74A  PHE*     3.1     6.6    +      +       -      +
     75A  LEU*     3.0    50.3    +      -       +      +
     81A  PRO*     3.6    10.9    -      -       -      +
     82A  PRO*     3.5    33.7    -      -       +      +
     98A  ALA*     3.8    34.2    +      -       +      -
    218A  ARG*     5.7     0.7    -      -       -      -
    219A  PHE*     3.6    13.6    -      +       -      -
    268A  PHE*     3.6    28.4    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 72 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26A  ALA*     3.6    20.3    +      -       +      +
     30A  VAL*     3.7    22.1    -      -       +      +
     33A  ARG*     4.7     8.7    -      -       -      +
     68A  TYR*     2.9    61.6    +      -       +      +
     69A  ALA      3.8     3.4    -      -       -      +
     71A  TYR*     1.3    81.8    -      -       -      +
     73A  ALA*     1.3    59.3    +      -       -      +
     75A  LEU*     3.2    16.0    +      -       -      +
     76A  GLU*     2.8    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 73 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     4.5     6.7    -      -       +      -
     24A  SER*     3.2    35.4    -      -       -      +
     26A  ALA*     4.1     2.4    -      -       -      +
     27A  ALA*     4.1     4.7    -      -       +      -
     69A  ALA      2.9    17.2    +      -       -      +
     70A  ALA*     3.5     9.4    -      -       -      +
     72A  ARG*     1.3    76.4    -      -       -      +
     74A  PHE*     1.3    56.6    +      -       -      +
     76A  GLU*     3.3     4.5    +      -       -      +
     77A  ALA*     2.9    29.8    +      -       -      +
    296A  LEU*     4.2    15.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 74 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2A  TYR*     3.6    28.9    -      +       -      -
     70A  ALA      3.0    13.5    +      -       -      +
     71A  TYR*     3.1    10.3    +      +       -      +
     73A  ALA*     1.3    74.2    -      -       -      +
     75A  LEU*     1.3    66.8    +      -       +      +
     77A  ALA*     3.3     9.0    +      -       -      +
     78A  GLY      3.5     0.3    +      -       -      -
     79A  GLY*     2.8    44.5    +      -       -      -
     80A  LYS      3.7     7.6    -      -       -      -
    266A  LEU*     3.7    16.2    -      -       +      -
    268A  PHE*     3.7    21.3    -      +       +      -
    290A  VAL*     4.7     0.2    -      -       +      -
    296A  LEU*     3.4    26.0    -      -       +      +
    299A  ALA*     3.7    26.2    -      -       +      -
    300A  LEU*     3.7    18.2    -      -       +      -
    303A  GLU*     4.4    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 75 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     71A  TYR*     3.0    54.3    +      -       +      +
     72A  ARG*     3.6    21.5    -      -       -      +
     74A  PHE*     1.3    77.9    -      -       +      +
     76A  GLU*     1.3    57.7    +      -       -      +
     78A  GLY*     2.9    21.3    +      -       -      -
     79A  GLY      3.4    20.8    +      -       -      +
     80A  LYS      3.8    20.9    -      -       -      +
     81A  PRO*     3.8     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 76 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ALA      4.8     0.3    -      -       -      +
     24A  SER*     2.8    23.0    +      -       -      -
     25A  PRO*     3.1    28.7    -      -       -      +
     26A  ALA*     2.8    33.8    +      -       +      +
     72A  ARG      2.8    18.5    +      -       -      +
     73A  ALA      3.5     3.9    -      -       -      +
     75A  LEU*     1.3    77.5    -      -       -      +
     77A  ALA*     1.3    58.5    +      -       -      +
     78A  GLY*     3.0     4.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 77 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     73A  ALA      2.9    16.3    +      -       -      +
     74A  PHE*     3.8     4.3    -      -       -      +
     75A  LEU      3.2     0.8    -      -       -      -
     76A  GLU*     1.3    75.8    -      -       -      +
     78A  GLY*     1.3    57.8    +      -       -      +
     79A  GLY      3.6     1.3    -      -       -      -
    296A  LEU*     4.6     6.7    -      -       +      -
    297A  ARG*     4.0    19.9    +      -       -      +
    300A  LEU*     3.5    33.4    -      -       +      +
----------------------------------------------------------
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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