Contacts of the helix formed by residues 696 - 721 (chain A) in PDB entry 1T65


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 696 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    694A  PRO      3.6     5.2    +      -       -      -
    695A  ASP*     1.3    75.9    -      -       -      +
    697A  PHE*     1.3    63.7    +      -       -      +
    698A  ALA*     3.8     5.7    +      -       -      +
    699A  ALA*     3.2    25.5    +      -       -      +
    700A  LEU*     2.7    33.4    +      -       -      +
    777A  LYS*     3.4    13.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 697 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    696A  SER*     1.3    73.5    -      -       -      +
    698A  ALA*     1.3    67.7    +      -       -      +
    700A  LEU*     3.9     2.4    -      -       -      -
    701A  LEU*     3.0    44.3    +      -       +      +
    777A  LYS*     3.3    33.7    -      -       -      +
    778A  SER      3.3    20.6    -      -       -      -
    779A  ARG*     3.5    57.7    -      -       +      +
    876A  PHE*     4.5     5.8    -      +       -      -
    880A  LEU*     4.0    18.4    -      -       +      -
    883A  LYS*     6.0     2.5    -      -       -      -
    887A  VAL*     4.0    20.4    -      -       +      -
    889A  VAL*     3.9    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 698 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    696A  SER*     3.3     5.5    +      -       -      +
    697A  PHE*     1.3    81.5    -      -       +      +
    699A  ALA*     1.3    57.7    +      -       -      +
    701A  LEU*     4.0     1.0    -      -       -      +
    702A  SER*     2.8    34.8    +      -       -      -
    887A  VAL      3.8    11.7    -      -       -      +
    888A  SER*     3.6    24.9    -      -       -      +
    889A  VAL*     4.2    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 699 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    689A  HIS*     4.1    14.1    -      -       +      +
    693A  GLN*     6.4     1.6    -      -       +      -
    694A  PRO      5.7     2.5    -      -       -      +
    696A  SER*     3.2    19.5    +      -       -      +
    698A  ALA*     1.3    75.4    -      -       -      +
    700A  LEU*     1.3    69.6    +      -       +      +
    702A  SER*     3.9     5.1    -      -       -      -
    703A  SER*     3.1    29.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 700 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    689A  HIS*     4.1    22.4    -      -       +      +
    695A  ASP*     3.9    14.8    -      -       +      +
    696A  SER      2.7    44.5    +      -       -      +
    697A  PHE*     3.9     3.6    -      -       -      +
    699A  ALA*     1.3    82.4    -      -       +      +
    701A  LEU*     1.3    63.9    +      -       +      +
    703A  SER*     3.4     2.6    +      -       -      -
    704A  LEU*     3.1    31.9    +      -       -      +
    768A  LEU*     4.3     5.2    -      -       +      +
    770A  PHE*     3.9    33.2    -      -       +      -
    774A  ARG*     4.0    26.0    -      -       +      +
    777A  LYS*     5.4     6.7    -      -       +      -
    778A  SER*     5.4     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 701 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    697A  PHE*     3.0    49.7    +      -       +      +
    700A  LEU*     1.3    78.4    -      -       +      +
    702A  SER*     1.3    66.7    +      -       -      +
    704A  LEU*     3.3     8.0    +      -       +      +
    705A  ASN*     3.0    29.2    +      -       -      -
    778A  SER*     3.7    24.0    -      -       -      +
    780A  MET*     3.5    25.1    -      -       +      -
    876A  PHE*     4.2     0.9    -      -       +      -
    880A  LEU*     3.7    22.0    -      -       +      -
    889A  VAL*     4.0    19.5    -      -       +      -
    931A  DHT      4.0    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 702 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    698A  ALA      2.8    24.1    +      -       -      -
    699A  ALA*     3.9     5.8    -      -       -      -
    701A  LEU*     1.3    76.3    -      -       -      +
    703A  SER*     1.3    58.0    -      -       -      +
    705A  ASN*     3.4     4.3    +      -       -      +
    706A  GLU*     3.0    26.7    +      -       -      +
    888A  SER      4.1     2.3    +      -       -      -
    889A  VAL*     3.8     4.3    -      -       -      +
    890A  ASP*     3.2    47.6    +      -       -      +
    892A  PRO*     5.6     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 703 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687A  ALA*     4.1     8.5    -      -       -      +
    688A  GLY      5.0     0.9    -      -       -      -
    689A  HIS*     2.7    49.8    +      -       -      +
    699A  ALA      3.1    11.5    +      -       -      -
    700A  LEU      3.7     4.0    -      -       -      -
    702A  SER*     1.3    75.3    -      -       -      +
    704A  LEU*     1.3    64.6    +      -       -      +
    706A  GLU*     3.2     7.2    +      -       -      +
    707A  LEU*     2.9    24.3    +      -       -      +
    768A  LEU*     4.4    10.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 704 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    700A  LEU      3.1    21.4    +      -       -      +
    701A  LEU*     3.3    13.9    +      -       +      +
    703A  SER*     1.3    76.2    -      -       -      +
    705A  ASN*     1.3    57.9    +      -       -      +
    707A  LEU*     3.3     7.1    +      -       +      +
    708A  GLY      2.9    23.0    +      -       -      -
    764A  PHE*     3.8    36.8    -      -       +      -
    768A  LEU*     3.7    22.2    -      -       +      -
    770A  PHE*     3.9    21.5    -      -       +      -
    780A  MET*     4.0    27.1    -      -       +      -
    931A  DHT      3.4    34.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 705 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    701A  LEU      3.0    12.0    +      -       -      -
    702A  SER      3.6     4.7    -      -       -      +
    703A  SER      3.2     0.2    -      -       -      -
    704A  LEU*     1.3    77.0    -      -       -      +
    706A  GLU*     1.3    56.9    +      -       -      +
    708A  GLY*     3.2     2.1    +      -       -      -
    709A  GLU*     3.1    23.0    +      -       -      +
    880A  LEU*     4.9     0.4    -      -       -      +
    889A  VAL*     3.4    23.6    -      -       -      +
    890A  ASP      2.9    29.3    +      -       -      +
    891A  PHE*     3.6    24.6    -      -       -      -
    892A  PRO*     3.8    11.5    -      -       +      +
    895A  MET*     3.8    13.4    -      -       +      +
    931A  DHT      2.8    36.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 706 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687A  ALA      3.8    12.8    -      -       -      +
    702A  SER      3.0    16.5    +      -       -      +
    703A  SER*     3.7     7.0    -      -       -      +
    705A  ASN*     1.3    72.9    -      -       -      +
    707A  LEU*     1.3    66.5    +      -       -      +
    709A  GLU*     3.2     6.9    +      -       -      +
    710A  ARG*     2.8    70.8    +      -       -      +
    892A  PRO*     3.8    21.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 707 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685A  VAL*     4.0    28.3    -      -       +      +
    686A  CYS      4.1    11.0    -      -       -      +
    687A  ALA*     3.9    11.4    +      -       +      +
    703A  SER      2.9    16.8    +      -       -      +
    704A  LEU*     3.6     6.1    -      -       +      +
    706A  GLU*     1.3    77.1    -      -       -      +
    708A  GLY*     1.3    57.6    +      -       -      +
    710A  ARG*     3.3     3.5    +      -       -      -
    711A  GLN*     2.8    59.0    +      -       +      +
    764A  PHE*     3.5    39.7    -      -       +      +
    765A  ALA*     4.1     4.5    -      -       +      -
    768A  LEU*     4.3     7.9    -      -       +      -
    931A  DHT      4.0    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 708 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    704A  LEU      2.9    14.3    +      -       -      -
    705A  ASN      3.2     4.2    +      -       -      -
    706A  GLU      3.1     0.4    -      -       -      -
    707A  LEU*     1.3    78.6    -      -       -      +
    709A  GLU*     1.3    55.8    +      -       -      +
    711A  GLN*     3.3     5.2    +      -       -      +
    712A  LEU*     2.9    29.8    +      -       -      +
    745A  MET*     3.9     9.1    -      -       -      +
    895A  MET*     4.0    19.5    -      -       -      +
    931A  DHT      4.2    13.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 709 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    705A  ASN      3.1    12.9    +      -       -      +
    706A  GLU*     3.2    14.8    +      -       -      +
    708A  GLY*     1.3    76.2    -      -       -      +
    710A  ARG*     1.3    61.6    +      -       +      +
    712A  LEU*     3.4    17.1    +      -       -      +
    713A  VAL*     3.5    13.0    +      -       +      +
    892A  PRO*     3.3    25.2    -      -       +      +
    893A  GLU*     3.8     5.0    +      -       -      +
    894A  MET*     3.1    41.0    +      -       +      +
    895A  MET*     3.0    35.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 710 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685A  VAL*     3.9    12.8    -      -       +      -
    686A  CYS*     2.9    33.7    +      -       -      +
    687A  ALA      3.6    18.8    +      -       -      -
    688A  GLY*     3.7     9.1    -      -       -      +
    706A  GLU*     2.8    50.1    +      -       -      +
    707A  LEU*     3.8     4.3    -      -       -      +
    709A  GLU*     1.3    74.5    -      -       +      +
    711A  GLN*     1.3    64.3    +      -       -      +
    713A  VAL*     3.3    15.1    +      -       -      +
    714A  HIS*     3.1    23.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 711 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    685A  VAL*     4.1    16.3    -      -       +      +
    707A  LEU*     2.8    38.7    +      -       +      +
    708A  GLY      3.9     2.9    -      -       -      +
    710A  ARG*     1.3    73.3    -      -       -      +
    712A  LEU*     1.3    61.3    +      -       -      +
    714A  HIS*     3.1     9.3    +      -       -      +
    715A  VAL*     2.9    33.3    +      -       +      +
    745A  MET*     3.5    30.8    +      -       +      +
    748A  ALA*     5.9     1.0    -      -       -      +
    752A  ARG*     3.5    28.4    +      -       -      +
    764A  PHE      3.9     1.4    -      -       -      +
    931A  DHT      3.3    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 712 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    708A  GLY      2.9    17.6    +      -       -      +
    709A  GLU*     3.5     9.2    -      -       -      +
    710A  ARG      3.2     0.2    -      -       -      -
    711A  GLN*     1.3    78.3    -      -       -      +
    713A  VAL*     1.3    62.1    +      -       -      +
    715A  VAL*     3.4     4.6    +      -       +      +
    716A  VAL*     3.1    35.2    +      -       +      +
    737A  ILE*     4.7    14.1    -      -       +      -
    741A  TRP*     4.1    22.2    -      -       +      -
    745A  MET*     3.7    17.4    -      -       +      +
    894A  MET*     3.7    37.7    -      -       +      -
    895A  MET*     5.3     6.3    -      -       -      +
    898A  ILE*     3.8    28.3    -      -       +      -
    923B  LEU*     4.8     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 713 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    709A  GLU*     3.6    15.0    -      -       +      +
    710A  ARG*     3.3    11.2    +      -       -      +
    711A  GLN      3.2     0.6    -      -       -      -
    712A  LEU*     1.3    77.8    -      -       -      +
    714A  HIS*     1.3    68.6    +      -       +      +
    716A  VAL*     3.4     5.7    +      -       -      +
    717A  LYS*     3.3    47.1    +      -       +      +
    894A  MET*     4.1    15.0    -      -       +      -
    925B  ARG*     5.1    10.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 714 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    682A  PRO*     4.2    27.7    -      -       +      +
    683A  GLY      5.0     6.1    -      -       -      -
    684A  VAL      5.1     3.2    +      -       -      -
    685A  VAL*     3.7    32.2    -      -       +      +
    710A  ARG*     3.1    24.5    +      -       +      -
    711A  GLN*     3.1     9.0    +      -       -      +
    713A  VAL*     1.3    82.7    -      -       +      +
    715A  VAL*     1.3    61.8    +      -       +      +
    717A  LYS*     3.4    11.9    +      -       +      +
    718A  TRP*     2.9    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 715 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    682A  PRO*     5.6     2.0    -      -       +      -
    711A  GLN*     2.9    23.5    +      -       +      +
    712A  LEU*     3.7     9.6    -      -       +      +
    714A  HIS*     1.3    78.2    -      -       +      +
    716A  VAL*     1.3    56.6    +      -       -      +
    718A  TRP*     3.6    14.8    -      -       +      +
    719A  ALA*     2.9    30.5    +      -       +      +
    737A  ILE*     4.6    18.6    -      -       +      -
    741A  TRP*     5.4     2.9    -      -       +      -
    744A  LEU*     4.2    27.8    -      -       +      -
    745A  MET*     4.1    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 716 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    712A  LEU*     3.1    21.1    +      -       +      +
    713A  VAL*     3.8     6.7    -      -       -      +
    714A  HIS      3.3     0.2    -      -       -      -
    715A  VAL*     1.3    78.5    -      -       -      +
    717A  LYS*     1.3    63.3    +      -       +      +
    719A  ALA*     3.9     1.2    -      -       -      +
    720A  LYS*     3.0    33.7    +      -       +      +
    737A  ILE*     4.3    24.7    -      -       +      -
    894A  MET*     6.4     1.3    -      -       -      -
    923B  LEU*     4.2    26.2    -      -       +      -
    925B  ARG*     3.3    27.4    -      -       +      +
    926B  LEU*     4.1    12.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 717 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    713A  VAL*     3.3    34.2    +      -       +      +
    714A  HIS*     3.8    13.7    -      -       +      +
    716A  VAL*     1.3    77.8    -      -       +      +
    718A  TRP*     1.3    63.7    +      -       -      +
    720A  LYS*     3.7    18.9    +      -       -      +
    721A  ALA*     3.5    18.7    +      -       -      +
    925B  ARG*     2.9    38.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 718 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    677A  LEU*     5.3     2.6    +      -       +      +
    680A  ILE*     3.6    46.6    -      -       +      +
    681A  GLU*     4.1     2.6    +      -       -      -
    682A  PRO*     3.8    22.7    -      -       +      -
    714A  HIS      2.9    18.7    +      -       -      +
    715A  VAL*     3.6    17.9    -      -       +      +
    717A  LYS*     1.3    75.1    -      -       -      +
    719A  ALA*     1.3    77.5    +      -       +      +
    721A  ALA*     3.0    17.4    +      -       -      +
    722A  LEU*     3.4    34.8    +      -       +      +
    744A  LEU*     4.0    26.9    -      -       +      -
    805A  LEU      5.5     0.9    -      -       -      -
    808A  LYS*     3.7    34.9    -      -       +      +
    809A  ALA*     3.9    31.4    -      -       +      -
    812A  LEU*     4.3     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 719 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    715A  VAL*     2.9    19.0    +      -       +      +
    716A  VAL      3.9     3.4    -      -       -      +
    718A  TRP*     1.3    87.0    -      -       +      +
    720A  LYS*     1.3    62.5    +      -       -      +
    721A  ALA      3.1     1.4    +      -       -      -
    722A  LEU*     3.1    18.9    +      -       -      +
    725A  PHE*     3.1    23.3    -      -       +      +
    737A  ILE*     4.1    22.2    -      -       +      -
    812A  LEU*     4.0    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 720 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    716A  VAL*     3.0    28.8    +      -       +      +
    717A  LYS*     3.9    18.7    -      -       -      +
    718A  TRP      3.3     0.2    -      -       -      -
    719A  ALA*     1.3    75.5    -      -       +      +
    721A  ALA*     1.3    58.7    +      -       -      +
    722A  LEU      3.4     1.1    +      -       -      +
    725A  PHE*     3.8    24.6    -      -       +      +
    726A  ARG*     4.6    22.8    +      -       -      +
    733A  GLN*     5.1     3.6    -      -       -      +
    737A  ILE*     5.7     1.3    -      -       +      -
    925B  ARG*     3.4    23.6    +      -       -      +
    926B  LEU      3.5    28.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 721 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676A  VAL*     4.2     5.4    -      -       -      +
    680A  ILE*     3.9    32.6    -      -       +      +
    717A  LYS      3.5    10.7    +      -       -      +
    718A  TRP*     3.0    11.6    +      -       -      +
    720A  LYS*     1.3    76.4    -      -       -      +
    722A  LEU*     1.3    63.9    +      -       -      +
    723A  PRO*     3.7     3.5    -      -       -      +
----------------------------------------------------------
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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