Contacts of the helix formed by residues 672 - 699 (chain M) in PDB entry 3HOU


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 672 (chain M).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    670M  ILE      3.9     2.0    +      -       -      -
    671M  ALA*     1.3    73.3    -      -       -      +
    673M  GLY*     1.3    73.5    +      -       -      +
    674M  PRO*     2.8    33.0    -      -       -      +
    675M  THR*     3.0     5.9    +      -       -      -
    676M  MET*     2.9    19.6    +      -       -      +
    736M  ASN*     2.9    39.0    +      -       -      +
    738M  LYS*     5.6     7.5    -      -       -      +
    195O  GLN*     3.4    25.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 673 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671M  ALA      3.6     2.7    +      -       -      -
    672M  ASP*     1.3    76.2    +      -       -      +
    674M  PRO*     1.3    66.6    -      -       -      +
    676M  MET*     3.1    20.5    +      -       -      +
    677M  ARG*     3.2     6.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 674 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    672M  ASP*     2.8    35.0    -      -       -      +
    673M  GLY*     1.3    75.9    -      -       -      +
    675M  THR*     1.3    52.0    +      -       -      +
    676M  MET      2.7    15.7    +      -       -      -
    677M  ARG*     2.9    25.8    +      -       +      +
    678M  GLU*     2.7    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 675 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671M  ALA*     4.7     3.8    -      -       +      -
    672M  ASP*     3.0    10.9    +      -       -      -
    674M  PRO*     1.3    79.9    -      -       -      +
    676M  MET*     1.3    57.4    +      -       -      +
    678M  GLU*     4.0    17.8    +      -       -      +
    679M  ILE*     2.9    23.4    +      -       -      +
    732M  LEU*     3.9    21.5    -      -       +      +
    733M  ALA*     4.1     5.6    -      -       -      -
    736M  ASN*     2.3    56.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 676 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    670M  ILE*     4.9     7.0    -      -       +      -
    671M  ALA*     3.5    44.0    -      -       +      +
    672M  ASP      2.9     3.6    +      -       -      +
    673M  GLY*     3.1    12.3    -      -       -      +
    674M  PRO      2.7     2.0    +      -       -      -
    675M  THR*     1.3    76.4    -      -       -      +
    677M  ARG*     1.3    58.1    +      -       -      +
    678M  GLU      3.0     1.1    -      -       -      -
    679M  ILE*     2.6    37.7    +      -       -      +
    680M  THR*     3.0    12.1    +      -       -      -
    762M  SER*     2.9    31.0    -      -       -      +
    763M  ALA      5.6     1.6    -      -       -      +
    803M  SER*     5.0     5.2    -      -       -      +
    805M  LEU*     5.6     4.3    -      -       +      -
    806M  ARG*     4.5    28.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 677 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    673M  GLY      3.2     7.4    +      -       -      +
    674M  PRO*     2.9    27.4    +      -       +      +
    676M  MET*     1.3    76.9    -      -       -      +
    678M  GLU*     1.3    73.0    +      -       -      +
    680M  THR*     2.8    23.8    +      -       -      +
    681M  GLU*     3.2    46.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 678 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674M  PRO      2.7    19.1    +      -       -      +
    675M  THR*     4.0    19.4    +      -       -      +
    677M  ARG*     1.3    85.5    +      -       -      +
    679M  ILE*     1.3    57.0    +      -       -      +
    681M  GLU*     3.0    29.9    -      -       -      +
    682M  THR*     2.9    19.6    +      -       -      +
    732M  LEU*     3.6    32.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 679 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671M  ALA*     4.7     1.6    -      -       +      -
    675M  THR      2.9    24.2    -      -       -      +
    676M  MET*     2.6    34.7    +      -       -      +
    678M  GLU*     1.3    69.5    -      -       -      +
    680M  THR*     1.3    58.1    +      -       -      +
    682M  THR*     2.6    26.9    +      -       -      -
    683M  ILE*     3.0    21.6    +      -       +      +
    729M  ALA*     3.5    44.6    -      -       +      +
    732M  LEU*     3.9    14.4    -      -       +      -
    733M  ALA*     4.3    13.7    -      -       +      +
    762M  SER      4.5     0.2    -      -       -      +
    763M  ALA*     4.2    23.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 680 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676M  MET      3.0     9.2    +      -       -      -
    677M  ARG*     2.8    21.5    +      -       -      +
    679M  ILE*     1.3    78.0    -      -       -      +
    681M  GLU*     1.3    57.6    +      -       -      +
    683M  ILE*     3.2    10.6    +      -       +      +
    684M  ALA*     2.7    27.0    +      -       -      +
    801M  GLU*     4.5     5.0    -      -       -      +
    806M  ARG*     4.5    11.1    +      -       -      +
    729N  ILE*     3.4    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 681 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    677M  ARG*     3.2    45.0    +      -       -      +
    678M  GLU*     3.0    25.9    -      -       -      +
    680M  THR*     1.3    74.4    -      -       -      +
    682M  THR*     1.3    59.5    +      -       -      +
    683M  ILE      3.0     1.8    -      -       -      -
    684M  ALA*     3.7     8.7    -      -       +      -
    685M  GLU*     2.7    37.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 682 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678M  GLU*     2.9    17.3    +      -       -      +
    679M  ILE*     2.6    19.6    +      -       -      -
    681M  GLU*     1.3    73.6    -      -       -      +
    683M  ILE*     1.3    57.2    +      -       -      -
    685M  GLU*     3.3    19.6    -      -       -      +
    686M  ALA*     3.5    11.8    -      -       -      +
    725M  ALA*     4.1    11.8    -      -       -      +
    728M  LYS*     3.4    47.4    -      -       +      +
    729M  ALA*     4.3     6.7    -      -       +      +
    732M  LEU*     3.7    13.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 683 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679M  ILE*     3.0    28.6    +      -       +      +
    680M  THR*     3.4    11.7    -      -       +      +
    682M  THR*     1.3    78.0    -      -       -      +
    684M  ALA*     1.3    54.0    +      -       -      +
    686M  ALA*     3.1     7.2    +      -       -      +
    687M  LYS*     2.8    39.6    +      -       +      +
    725M  ALA*     4.9     6.7    -      -       +      +
    726M  ARG      5.9     0.2    -      -       -      +
    729M  ALA*     4.6     8.5    -      -       +      -
    763M  ALA      4.8     1.3    -      -       -      +
    764M  CYS*     4.0    18.4    -      -       +      -
    799M  PHE*     4.0    20.0    -      -       +      -
    801M  GLU*     3.3    56.5    -      -       +      +
    729N  ILE*     5.9     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 684 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680M  THR      2.7    16.8    +      -       -      +
    681M  GLU*     3.5    11.4    -      -       +      +
    683M  ILE*     1.3    76.3    -      -       -      +
    685M  GLU*     1.3    54.8    +      -       -      +
    687M  LYS*     2.7    37.2    +      -       -      +
    688M  LYS*     3.0     7.6    +      -       -      +
    801M  GLU*     4.9     1.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 685 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    681M  GLU*     2.7    29.6    +      -       +      +
    682M  THR*     3.3    21.1    -      -       -      +
    684M  ALA*     1.3    71.8    -      -       -      +
    686M  ALA*     1.3    68.6    +      -       -      +
    688M  LYS*     3.2     7.5    +      -       -      +
    689M  LYS*     2.9    32.3    +      -       -      +
    725M  ALA*     5.6     1.2    -      -       -      +
    728M  LYS*     4.4    18.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 686 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    682M  THR      3.5     8.7    -      -       -      +
    683M  ILE      3.1     5.0    +      -       -      +
    685M  GLU*     1.3    89.4    -      -       -      +
    687M  LYS*     1.3    61.7    +      -       -      +
    689M  LYS*     3.7    12.3    -      -       +      +
    690M  VAL*     3.3    20.8    +      -       -      +
    721M  PHE*     4.2    15.0    -      -       +      +
    722M  LEU*     5.3     3.5    -      -       -      +
    725M  ALA*     3.3    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 687 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    683M  ILE*     2.8    18.8    +      -       +      +
    684M  ALA*     2.7    21.1    +      -       -      +
    686M  ALA*     1.3    78.9    -      -       -      +
    688M  LYS*     1.3    54.7    +      -       -      +
    690M  VAL*     2.7    29.9    -      -       -      +
    691M  LEU*     3.0     7.0    +      -       -      +
    794M  PRO*     4.3    10.1    -      -       +      -
    795M  GLU*     2.8    47.3    +      -       -      +
    799M  PHE*     5.2     6.3    -      -       +      -
    801M  GLU*     3.1    32.7    +      -       -      -
    729N  ILE*     5.8     1.4    -      -       -      +
    731N  VAL*     5.2     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 688 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    684M  ALA      3.0     9.3    +      -       -      +
    685M  GLU*     3.8     8.1    -      -       -      +
    687M  LYS*     1.3    74.5    -      -       -      +
    689M  LYS*     1.3    54.1    +      -       -      +
    690M  VAL      2.7     7.9    +      -       -      -
    691M  LEU*     2.7    46.8    +      -       +      -
    692M  ASP*     2.8    37.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 689 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685M  GLU*     2.9    21.7    +      -       -      +
    686M  ALA*     3.7    12.1    -      -       +      +
    687M  LYS      3.4     0.2    -      -       -      -
    688M  LYS*     1.3    75.0    -      -       -      +
    690M  VAL*     1.3    56.1    +      -       -      +
    692M  ASP*     4.1     9.2    -      -       -      +
    693M  VAL*     2.9    28.5    +      -       +      +
    721M  PHE*     3.3    39.8    -      -       +      -
    724M  GLU*     4.0    20.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 690 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    686M  ALA      3.3    11.0    +      -       -      +
    687M  LYS*     2.7    27.1    -      -       -      +
    688M  LYS      2.7     0.8    +      -       -      -
    689M  LYS*     1.3    77.3    -      -       -      +
    691M  LEU*     1.3    59.5    +      -       -      +
    692M  ASP      3.2     1.8    -      -       -      -
    693M  VAL*     3.3     3.8    +      -       +      +
    694M  THR*     2.8    35.8    +      -       -      +
    718M  VAL*     3.4    48.5    -      -       +      +
    721M  PHE*     4.0     9.9    -      -       +      -
    722M  LEU*     4.6     6.5    -      -       +      -
    794M  PRO*     3.8    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 691 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687M  LYS      3.6     8.5    -      -       -      +
    688M  LYS*     2.7    43.7    +      -       +      +
    690M  VAL*     1.3    78.6    -      -       -      +
    692M  ASP*     1.3    67.6    +      -       -      +
    694M  THR*     3.2    11.2    -      -       -      -
    695M  LYS*     3.1    46.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 692 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    688M  LYS*     2.8    48.0    +      -       -      +
    689M  LYS*     4.1     8.5    -      -       -      +
    691M  LEU*     1.3    75.8    -      -       -      +
    693M  VAL*     1.3    56.5    +      -       +      +
    694M  THR      2.6    15.7    +      -       -      -
    695M  LYS*     2.8    18.7    +      -       -      +
    696M  GLU*     2.8    17.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 693 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    689M  LYS      2.9    24.2    +      -       -      +
    690M  VAL*     3.3     9.7    +      -       +      +
    692M  ASP*     1.3    78.6    -      -       +      +
    694M  THR*     1.3    59.5    +      -       -      +
    696M  GLU*     4.0    15.6    -      -       -      +
    697M  ALA*     3.3    21.3    +      -       -      +
    702M  LEU*     4.3     9.5    -      -       +      +
    714M  PHE*     3.8    21.2    -      -       +      +
    717M  ASN*     4.5    20.9    -      -       +      +
    718M  VAL*     4.8     2.2    -      -       +      -
    721M  PHE*     3.3    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 694 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    690M  VAL*     2.8    23.1    +      -       -      +
    691M  LEU*     3.2    13.0    -      -       +      -
    692M  ASP      2.6     5.3    +      -       -      -
    693M  VAL*     1.3    72.1    -      -       -      +
    695M  LYS*     1.3    62.4    +      -       +      +
    697M  ALA*     2.9    17.7    +      -       -      +
    698M  GLN*     3.0    38.2    +      -       +      +
    714M  PHE*     3.7    25.7    -      -       +      -
    792M  TYR*     5.3    12.3    +      -       +      +
    793M  SER*     5.9     2.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 695 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    691M  LEU*     3.1    33.9    +      -       +      +
    692M  ASP*     2.8    11.5    +      -       -      +
    694M  THR*     1.3    72.2    -      -       +      +
    696M  GLU*     1.3    56.4    +      -       -      +
    697M  ALA      2.9     4.7    -      -       -      -
    698M  GLN*     2.8    41.2    +      -       -      +
    699M  ALA*     3.2    13.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 696 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    692M  ASP*     2.8    18.1    +      -       +      +
    693M  VAL*     4.0    13.6    +      -       -      +
    695M  LYS*     1.3    75.8    -      -       -      +
    697M  ALA*     1.3    56.7    +      -       -      +
    699M  ALA*     4.2     2.5    -      -       -      +
    701M  LEU*     3.3    51.7    +      -       +      +
    702M  LEU*     3.1    24.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 697 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    693M  VAL      3.3    13.9    +      -       -      +
    694M  THR*     2.9     8.9    +      -       -      +
    695M  LYS      2.9     0.8    -      -       -      -
    696M  GLU*     1.3    76.4    -      -       -      +
    698M  GLN*     1.3    61.9    +      -       -      +
    699M  ALA      3.3     2.2    +      -       -      -
    700M  ASN*     3.8     9.0    +      -       -      +
    702M  LEU*     3.2    34.3    -      -       +      +
    710M  LEU*     6.0     0.9    -      -       -      +
    714M  PHE*     4.3     4.5    -      -       +      -
     96U  SER*     5.7     0.2    -      -       -      -
     97U  MET*     3.2    39.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 698 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    694M  THR*     3.0    29.0    +      -       +      +
    695M  LYS*     2.8    32.0    +      -       -      +
    697M  ALA*     1.3    77.4    -      -       -      +
    699M  ALA*     1.3    56.7    +      -       -      +
    700M  ASN      3.3     3.4    -      -       -      -
    790M  ASP      5.7     3.0    +      -       -      -
     85U  PHE*     5.3     1.8    -      -       -      -
     87U  GLN*     4.8     4.0    -      -       -      +
     97U  MET*     2.9    20.2    -      -       +      +
     98U  VAL*     3.2    15.3    -      -       -      +
     99U  LEU*     3.2    46.0    -      -       +      +
    112U  SER*     2.9    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 699 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    695M  LYS      3.2    11.8    +      -       -      +
    696M  GLU      4.2     0.4    +      -       -      -
    697M  ALA      3.3     0.2    -      -       -      -
    698M  GLN*     1.3    76.9    -      -       -      +
    700M  ASN*     1.3    66.6    +      -       -      +
    701M  LEU*     2.9    44.8    -      -       +      +
    112U  SER      3.4    17.5    -      -       -      +
    113U  ASP*     4.3     1.3    -      -       -      -
    114U  GLN*     3.1    27.4    +      -       -      +
----------------------------------------------------------
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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