Contacts of the helix formed by residues 62 - 86 (chain F) in PDB entry 1MA1


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 ASP 62 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65C  ALA*     4.4     7.1    -      -       -      +
     69C  GLU*     4.6    10.6    -      -       -      +
     50F  LYS*     5.8     4.5    -      -       -      +
     61F  VAL*     1.3    72.4    -      -       -      +
     63F  ILE*     1.3    58.3    +      -       -      +
     64F  LYS*     3.4    13.7    +      -       -      +
     65F  ALA*     3.2    32.0    +      -       +      +
     66F  ALA*     3.0    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 63 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118D  GLU*     2.9    34.5    -      -       +      +
    121D  GLN*     3.3    33.3    -      -       +      +
    122D  ALA*     2.8    44.6    -      -       +      +
    125D  SER*     4.6     1.3    -      -       -      +
    145D  ILE*     6.1     0.4    -      -       +      -
     51F  LEU*     5.5     2.2    -      -       +      -
     61F  VAL*     3.1    26.1    +      -       +      -
     62F  ASP*     1.3    70.7    +      -       -      +
     64F  LYS*     1.3    65.4    +      -       -      +
     66F  ALA*     3.8     7.9    -      -       +      -
     67F  LEU*     2.8    47.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 64 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69C  GLU*     2.9    35.7    +      -       -      +
     73C  HIS*     5.2     3.6    -      -       -      -
    125D  SER*     3.4    37.5    +      -       -      +
    127D  GLU*     2.7    40.5    +      -       +      +
    147D  GLN*     3.4    28.7    -      -       -      +
     62F  ASP*     3.4    10.3    +      -       -      +
     63F  ILE*     1.3    82.2    -      -       -      +
     65F  ALA*     1.3    65.5    +      -       -      +
     67F  LEU*     4.1     1.3    -      -       -      +
     68F  LYS*     3.1    39.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 65 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  ASP*     4.5     6.7    -      -       -      +
     65C  ALA*     3.5    26.9    -      -       +      +
     62F  ASP*     3.2    29.5    +      -       +      +
     64F  LYS*     1.3    82.6    -      -       -      +
     66F  ALA*     1.3    63.5    +      -       -      +
     68F  LYS*     3.4     7.5    +      -       -      +
     69F  GLU*     3.0    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 66 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47F  LEU*     3.1    28.4    -      -       +      +
     50F  LYS*     5.5     7.2    -      -       -      +
     51F  LEU*     4.0    25.8    -      -       +      -
     61F  VAL*     5.2     0.9    -      -       +      -
     62F  ASP      3.0    18.7    +      -       -      +
     63F  ILE*     3.6     9.6    -      -       +      +
     64F  LYS      3.2     0.2    -      -       -      -
     65F  ALA*     1.3    77.1    -      -       -      +
     67F  LEU*     1.3    61.4    +      -       +      +
     69F  GLU*     3.3     2.7    +      -       -      +
     70F  LEU*     2.8    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 67 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118D  GLU*     6.1     0.9    -      -       -      +
    122D  ALA*     3.9    18.2    -      -       +      -
    145D  ILE*     3.2    55.7    -      -       +      +
    146D  MET*     5.4     1.2    -      -       -      +
    147D  GLN*     4.1    24.2    +      -       +      +
    154D  ASN      5.4     0.3    -      -       -      +
     51F  LEU*     4.8    14.8    -      -       +      -
     55F  ARG*     6.3     0.2    -      -       -      +
     63F  ILE*     2.8    37.2    +      -       +      +
     64F  LYS      4.2     0.9    -      -       -      +
     66F  ALA*     1.3    72.0    -      -       +      +
     68F  LYS*     1.3    61.2    +      -       -      +
     70F  LEU*     3.6    14.8    -      -       +      +
     71F  SER*     2.9    30.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 68 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     68C  LYS*     5.3    26.5    -      -       +      +
    150C  LYS*     4.1     3.4    -      -       -      +
    127D  GLU*     3.5    20.2    +      -       -      -
    147D  GLN*     3.9    20.2    -      -       +      +
    149D  GLU*     3.2    28.2    +      -       -      -
    154D  ASN*     3.8    29.5    -      -       +      +
    127E  GLU*     4.8     3.7    -      -       -      +
     64F  LYS*     3.1    30.6    +      -       +      +
     65F  ALA*     3.7     7.0    -      -       -      +
     67F  LEU*     1.3    77.0    -      -       -      +
     69F  GLU*     1.3    61.5    +      -       -      +
     71F  SER*     2.9    22.1    +      -       -      -
     72F  PHE*     3.2     8.3    +      -       -      +
    152F  ASN*     4.0     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 69 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62C  ASP*     4.6     9.5    -      -       -      +
     64C  LYS*     3.0    37.6    +      -       -      +
    127E  GLU*     4.0    10.3    -      -       -      +
     43F  GLY      4.8     1.9    -      -       -      +
     46F  ALA*     6.1     0.7    -      -       -      +
     47F  LEU*     3.9    21.2    -      -       +      +
     65F  ALA      3.0    16.6    +      -       -      +
     66F  ALA*     3.6     5.2    -      -       -      +
     68F  LYS*     1.3    75.2    -      -       -      +
     70F  LEU*     1.3    66.1    +      -       -      +
     72F  PHE*     3.1     4.3    +      -       -      +
     73F  HIS*     3.0    45.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 70 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144D  PHE*     4.2    30.7    -      -       +      -
    145D  ILE      4.4    15.7    -      -       -      +
    156D  ILE*     5.1     3.8    -      -       +      -
     44F  ALA*     4.4     9.4    -      -       -      +
     47F  LEU*     3.2    28.9    -      -       +      +
     48F  LEU*     4.4    18.8    -      -       +      -
     51F  LEU*     5.1    10.1    -      -       +      -
     66F  ALA      2.8    16.5    +      -       -      +
     67F  LEU*     3.6    13.7    -      -       +      +
     68F  LYS      3.3     0.2    -      -       -      -
     69F  GLU*     1.3    72.6    -      -       -      +
     71F  SER*     1.3    64.4    +      -       -      +
     73F  HIS*     5.1     1.8    -      -       -      -
     74F  VAL*     3.0    53.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 71 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    146D  MET*     5.2     4.5    -      -       -      -
    154D  ASN*     3.6    30.9    -      -       -      +
    156D  ILE*     3.7    25.9    -      -       -      +
     67F  LEU      2.9    15.8    +      -       -      -
     68F  LYS      2.9    10.2    +      -       -      -
     70F  LEU*     1.3    77.3    -      -       -      +
     72F  PHE*     1.3    60.6    +      -       -      +
     75F  GLY*     3.1    20.6    +      -       -      -
    152F  ASN*     2.8    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 72 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127E  GLU*     3.4    56.3    -      -       +      +
    128E  GLY      4.3     0.4    -      -       -      -
     40F  TYR*     3.9    15.5    -      +       -      -
     68F  LYS      3.2     8.5    +      -       -      +
     69F  GLU      3.1     8.5    +      -       -      +
     71F  SER*     1.3    83.2    +      -       -      +
     73F  HIS*     1.3    87.2    +      +       -      +
     76F  GLY      2.9    22.5    +      -       -      -
    150F  LYS*     3.8    15.7    -      -       +      -
    151F  HIS*     3.5    27.1    -      +       -      +
    152F  ASN*     3.7    14.8    -      -       -      +
    168F  TRP*     3.9    26.2    -      +       -      -
----------------------------------------------------------
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Residues in contact with HIS 73 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64C  LYS*     5.1     3.4    -      -       -      -
     39F  ALA*     4.0     4.1    +      -       -      +
     40F  TYR*     3.5    46.0    -      +       -      +
     43F  GLY*     3.6    28.4    +      -       -      -
     44F  ALA*     3.6    20.2    -      -       -      +
     47F  LEU*     5.6     0.4    -      -       -      +
     69F  GLU*     3.0    41.9    +      -       +      +
     70F  LEU*     4.3     2.2    -      -       -      +
     72F  PHE*     1.3    96.2    -      +       -      +
     74F  VAL*     1.3    61.6    +      -       -      +
     76F  GLY      3.2     0.7    +      -       -      -
     77F  TYR*     2.7    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 74 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144D  PHE*     4.1     5.2    -      -       +      -
    156D  ILE*     3.8    16.8    -      -       +      -
    159D  PHE*     3.8    23.8    -      -       +      -
      8F  TYR*     3.5    28.9    -      -       +      +
     44F  ALA*     4.0    13.9    -      -       +      -
     70F  LEU*     3.0    43.8    +      -       +      +
     73F  HIS*     1.3    73.6    -      -       -      +
     75F  GLY*     1.3    61.9    +      -       -      +
     77F  TYR*     3.5     5.9    -      -       -      +
     78F  VAL*     2.8    39.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 75 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156D  ILE*     4.1    11.9    -      -       -      +
    157D  PRO*     4.3     4.7    -      -       -      -
     71F  SER      3.1    19.8    +      -       -      -
     72F  PHE      3.9     0.2    -      -       -      -
     74F  VAL*     1.3    74.6    -      -       -      +
     76F  GLY*     1.3    64.4    +      -       -      +
     78F  VAL*     4.0     1.5    -      -       -      +
     79F  LEU*     2.9    30.5    +      -       -      +
    151F  HIS*     3.5    20.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 76 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40F  TYR*     3.9    10.3    -      -       -      -
     72F  PHE      2.9    12.1    +      -       -      -
     73F  HIS      3.2     4.4    +      -       -      -
     75F  GLY*     1.3    74.1    -      -       -      +
     77F  TYR*     1.3    61.2    +      -       -      +
     79F  LEU*     4.2     0.4    -      -       -      -
     80F  HIS*     2.8    32.7    +      -       -      +
    151F  HIS*     3.2    34.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 77 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139D  ARG*     3.3    36.7    +      -       +      +
      8F  TYR*     3.7    41.2    -      +       +      -
      9F  GLU      3.5    27.1    +      -       -      -
     11F  PRO*     4.1    13.7    -      -       +      +
     37F  HIS*     3.5    16.9    +      -       -      -
     40F  TYR*     3.7    10.1    -      -       +      +
     41F  VAL*     3.8    21.8    -      -       +      -
     44F  ALA*     5.6     0.4    -      -       +      -
     73F  HIS      2.7    19.6    +      -       -      +
     74F  VAL*     3.3     7.4    +      -       -      +
     76F  GLY*     1.3    72.5    -      -       -      +
     78F  VAL*     1.3    76.2    +      -       +      +
     81F  LEU*     3.1    37.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 78 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137D  CYS*     6.4     0.2    -      -       -      -
    156D  ILE*     4.5     1.3    -      -       +      -
    157D  PRO*     4.0    19.3    -      -       +      +
    158D  HIS*     4.3     4.9    -      -       +      +
    159D  PHE*     3.7    27.8    -      -       +      -
      8F  TYR*     5.9     0.7    -      -       +      -
     74F  VAL*     2.8    28.0    +      -       +      +
     75F  GLY*     4.0     4.5    -      -       -      +
     77F  TYR*     1.3    87.2    -      -       +      +
     79F  LEU*     1.3    64.1    +      -       +      +
     81F  LEU*     3.2     9.2    +      -       +      +
     82F  PHE*     3.1    40.3    +      -       +      -
    161F  ILE*     4.1    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 79 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157D  PRO*     3.9    15.5    -      -       +      -
     75F  GLY      2.9    19.7    +      -       -      +
     76F  GLY      4.3     0.2    -      -       -      +
     78F  VAL*     1.3    74.5    -      -       -      +
     80F  HIS*     1.3    60.3    +      -       -      +
     82F  PHE*     3.3     1.3    +      -       -      +
     83F  PHE*     2.9    29.6    +      -       -      +
    131F  TRP*     3.5    48.7    -      -       +      +
    133F  VAL*     4.2    11.7    -      -       +      -
    148F  VAL*     4.7     4.0    -      -       +      -
    151F  HIS*     3.7    22.7    -      -       +      +
    161F  ILE*     3.9    18.4    -      -       +      -
    164F  VAL*     3.6    30.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 80 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32F  HIS*     3.2    20.0    +      +       -      -
     37F  HIS*     3.6    32.4    +      +       +      +
     40F  TYR*     3.3    28.8    -      +       -      -
     76F  GLY      2.8    28.4    +      -       -      +
     79F  LEU*     1.3    77.5    -      -       -      +
     81F  LEU*     1.3    63.3    +      -       -      +
     83F  PHE*     3.4     6.5    -      +       -      +
     84F  TRP*     3.0    46.5    +      +       -      +
    131F  TRP*     3.6    19.0    -      +       -      -
    151F  HIS*     3.7     5.4    -      +       -      -
    166F  ASP*     4.1     1.6    -      -       -      -
    170F  HIS*     3.7     1.2    +      -       -      -
    206F   FE      2.1    30.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 81 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139D  ARG*     3.5    46.9    -      -       -      +
     11F  PRO*     3.8    27.1    -      -       +      -
     37F  HIS*     4.0     6.2    -      -       +      -
     77F  TYR*     3.1    29.3    +      -       +      +
     78F  VAL*     3.2    11.7    -      -       +      +
     79F  LEU      3.1     0.2    -      -       -      -
     80F  HIS*     1.3    79.8    -      -       -      +
     82F  PHE*     1.3    76.6    +      -       +      +
     84F  TRP*     3.7     5.5    +      -       +      +
     85F  GLY*     3.4    14.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 82 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158D  HIS*     3.6    32.1    -      +       -      -
     78F  VAL*     3.1    31.5    +      -       +      +
     79F  LEU      3.3     4.9    +      -       -      +
     81F  LEU*     1.3    93.0    -      -       +      +
     83F  PHE*     1.3    65.6    +      -       -      +
     86F  ASN*     3.0    14.3    +      -       -      +
    161F  ILE*     3.6    47.1    -      -       +      -
    164F  VAL*     4.5     4.3    -      -       +      -
    199F  ARG*     2.9    55.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 83 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24F  ILE*     4.9     3.8    -      -       +      -
     32F  HIS*     3.8    18.2    -      +       -      -
     79F  LEU      2.9    18.9    +      -       -      +
     80F  HIS*     3.2     6.0    +      -       -      +
     82F  PHE*     1.3    73.6    -      -       -      +
     84F  TRP*     1.3    97.5    +      +       -      +
     86F  ASN*     3.1    21.1    +      -       -      +
     87F  MET*     3.4    41.5    +      -       +      +
    131F  TRP*     3.8     7.4    -      +       +      -
    164F  VAL*     3.2    29.6    -      -       +      +
    165F  LEU*     3.8     9.6    -      -       +      -
    166F  ASP*     3.3    27.1    -      -       +      -
    183F  TYR*     3.3    22.4    -      +       -      -
    187F  PHE*     4.1     1.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with TRP 84 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11F  PRO*     4.7     6.1    -      -       +      -
     12F  GLU      5.7     1.3    -      -       -      +
     13F  LEU*     3.8    15.5    -      -       +      -
     14F  PRO*     4.1    18.1    -      -       +      +
     15F  TYR*     2.9    30.5    +      -       -      +
     24F  ILE*     6.2     1.1    -      -       +      -
     29F  LEU*     3.8    23.3    -      -       +      -
     32F  HIS*     3.4    34.1    -      +       +      -
     33F  HIS*     3.5    28.5    -      +       +      -
     37F  HIS*     2.8    33.0    +      +       -      -
     80F  HIS*     3.0    34.5    +      +       +      +
     81F  LEU*     4.0     6.7    -      -       +      +
     83F  PHE*     1.3    97.6    -      +       -      +
     85F  GLY*     1.3    61.8    +      -       -      +
     87F  MET*     3.3    22.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 85 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14F  PRO*     4.6    11.3    -      -       -      +
     81F  LEU      3.4     7.1    +      -       -      -
     82F  PHE      3.2     6.6    +      -       -      -
     83F  PHE      3.0     0.8    -      -       -      -
     84F  TRP*     1.3    82.5    -      -       -      +
     86F  ASN*     1.3    55.2    +      -       -      +
     87F  MET      3.3     6.9    +      -       -      +
    192F  ASN*     4.0     5.9    +      -       -      -
    195F  GLU*     3.3    20.7    -      -       -      +
    199F  ARG*     3.5    13.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 86 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82F  PHE      3.0    13.6    +      -       -      +
     83F  PHE      3.1    13.9    +      -       -      -
     85F  GLY*     1.3    77.0    -      -       -      +
     87F  MET*     1.3    63.9    +      -       -      +
    163F  LEU*     3.6    11.7    -      -       +      +
    164F  VAL*     3.0    38.7    +      -       -      +
    187F  PHE*     4.3     2.1    -      -       -      -
    191F  VAL*     3.5     8.1    -      -       -      +
    192F  ASN*     2.9    23.5    +      -       -      -
    195F  GLU*     4.4     0.9    -      -       +      -
    196F  VAL*     3.8    20.9    -      -       +      -
    199F  ARG*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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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