Contacts of the helix formed by residues 674 - 703 (chain J) in PDB entry 6ALH


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 THR 674 (chain J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668J  PHE*     3.3    13.7    -      -       -      -
    673J  VAL*     1.3    89.2    -      -       -      +
    675J  ALA*     1.3    62.5    +      -       -      +
    676J  GLY*     3.5     3.2    +      -       -      -
    677J  GLU*     3.0    31.7    +      -       -      +
    678J  ARG*     3.4     7.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 675 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668J  PHE*     3.6    20.7    -      -       +      -
    674J  THR*     1.3    74.2    -      -       -      +
    676J  GLY*     1.3    61.5    +      -       -      +
    678J  ARG*     3.2    21.0    +      -       -      +
    679J  TYR*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 676 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674J  THR*     3.5     4.1    +      -       -      -
    675J  ALA*     1.3    75.1    -      -       -      +
    677J  GLU*     1.3    59.7    +      -       -      +
    679J  TYR*     3.3    10.3    +      -       -      +
    680J  ASN*     2.8    40.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 677 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    673J  VAL*     3.4    35.3    -      -       +      +
    674J  THR*     3.0    27.8    +      -       -      +
    676J  GLY*     1.3    73.1    -      -       -      +
    678J  ARG*     1.3    58.3    +      -       -      +
    680J  ASN*     3.4     6.3    +      -       -      +
    681J  LYS*     2.9    33.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 678 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661J  VAL      6.1     0.2    -      -       -      -
    664J  ILE*     3.7    34.5    -      -       +      +
    665J  GLN*     3.7    29.4    +      -       -      +
    668J  PHE*     4.4    16.0    -      -       +      -
    673J  VAL*     4.3     7.1    -      -       +      +
    674J  THR      3.4    13.8    +      -       -      +
    675J  ALA*     3.2    25.0    +      -       -      +
    677J  GLU*     1.3    80.9    -      -       -      +
    679J  TYR*     1.3    63.7    +      -       -      +
    681J  LYS*     4.1     0.4    -      -       -      +
    682J  VAL*     2.9    51.8    +      -       -      +
    756J  GLU*     3.3    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 679 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    675J  ALA      2.9    13.6    +      -       -      +
    676J  GLY*     3.3    12.8    +      -       -      +
    678J  ARG*     1.3    85.5    -      -       -      +
    680J  ASN*     1.3    78.6    +      -       -      +
    682J  VAL*     3.9     3.4    -      -       -      +
    683J  ILE*     2.9    40.4    +      -       +      +
    753J  SER*     4.2     6.6    -      -       -      -
    754J  ILE*     2.3    53.4    +      -       +      +
    756J  GLU*     3.7    38.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 680 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676J  GLY*     2.8    27.6    +      -       -      +
    677J  GLU*     4.0     5.8    -      -       -      +
    679J  TYR*     1.3    94.6    -      -       -      +
    681J  LYS*     1.3    58.8    +      -       -      +
    683J  ILE*     3.2    11.4    -      -       -      +
    684J  ASP*     3.0    36.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 681 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664J  ILE*     4.4    28.5    -      -       +      -
    677J  GLU*     2.9    21.9    +      -       +      +
    678J  ARG*     4.1     3.4    -      -       -      +
    680J  ASN*     1.3    77.1    -      -       -      +
    682J  VAL*     1.3    57.2    +      -       -      +
    684J  ASP*     3.3     9.9    +      -       +      +
    685J  ILE*     3.0    47.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 682 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661J  VAL*     3.8    23.1    -      -       +      +
    664J  ILE*     3.8    29.2    -      -       +      -
    678J  ARG*     2.9    36.6    +      -       -      +
    679J  TYR*     4.0     3.6    -      -       -      +
    681J  LYS*     1.3    75.8    -      -       -      +
    683J  ILE*     1.3    59.4    +      -       +      +
    685J  ILE*     3.2     7.4    -      -       -      +
    686J  TRP*     2.9    52.5    +      -       +      +
    756J  GLU*     4.4    13.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 683 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679J  TYR*     2.9    29.9    +      -       +      +
    680J  ASN*     3.2    23.8    -      -       +      +
    682J  VAL*     1.3    78.1    -      -       +      +
    684J  ASP*     1.3    62.2    +      -       -      +
    686J  TRP*     3.5     5.9    +      -       +      +
    687J  ALA*     3.0    27.2    +      -       -      +
    746J  LEU*     3.7    21.4    -      -       +      +
    754J  ILE*     3.7    52.5    -      -       +      +
    755J  ILE      4.5     2.9    -      -       -      +
    756J  GLU*     5.1     5.6    -      -       -      +
    758J  PRO*     6.0     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 684 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680J  ASN*     3.0    25.6    +      -       -      +
    681J  LYS*     3.7    11.7    -      -       +      +
    682J  VAL      3.2     0.2    -      -       -      -
    683J  ILE*     1.3    80.4    -      -       -      +
    685J  ILE*     1.3    61.9    +      -       +      +
    687J  ALA*     3.2     7.2    +      -       -      +
    688J  ALA*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 685 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657J  ALA*     4.8     4.7    -      -       +      +
    660J  GLU*     3.7    37.9    -      -       +      +
    661J  VAL*     3.8    22.2    -      -       +      -
    664J  ILE*     4.6     9.0    -      -       +      -
    681J  LYS*     3.0    38.6    +      -       +      +
    682J  VAL*     3.2    19.5    -      -       -      +
    684J  ASP*     1.3    77.0    -      -       +      +
    686J  TRP*     1.3    58.3    +      -       +      +
    688J  ALA*     3.7     7.4    -      -       +      +
    689J  ALA*     3.0    28.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 686 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    654J  ILE*     5.1     9.2    -      -       +      -
    657J  ALA*     4.5    26.2    -      -       +      -
    658J  GLU*     5.3     2.5    -      -       +      -
    661J  VAL*     3.4    31.4    -      -       +      +
    682J  VAL*     2.9    41.9    +      -       +      +
    683J  ILE*     3.7     7.4    -      -       -      +
    685J  ILE*     1.3    77.5    -      -       +      +
    687J  ALA*     1.3    57.9    +      -       -      +
    689J  ALA*     3.3     6.2    +      -       +      +
    690J  ASN*     2.9    27.8    +      -       -      +
    743J  MET*     4.8    20.4    -      -       +      +
    746J  LEU*     4.8     7.3    -      -       +      +
    756J  GLU      4.4     2.8    +      -       -      -
    757J  THR*     5.5     4.7    -      -       +      +
    758J  PRO*     3.4    47.1    -      -       +      +
    760J  THR*     3.6    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 687 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    683J  ILE      3.0    17.4    +      -       -      +
    684J  ASP*     3.2     9.6    +      -       -      +
    686J  TRP*     1.3    76.3    -      -       -      +
    688J  ALA*     1.3    58.4    +      -       -      +
    690J  ASN*     3.2     9.5    +      -       -      +
    691J  ASP*     3.0    33.8    +      -       -      +
    746J  LEU*     5.2     8.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 688 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    684J  ASP      2.9    16.6    +      -       -      +
    685J  ILE*     3.7     8.3    -      -       -      +
    687J  ALA*     1.3    78.3    -      -       -      +
    689J  ALA*     1.3    57.0    +      -       -      +
    691J  ASP*     3.3     9.2    +      -       -      +
    692J  ARG*     3.0    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 689 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653J  ILE*     4.0    16.3    -      -       +      +
    657J  ALA*     4.4    19.5    -      -       +      -
    685J  ILE      3.0    17.6    +      -       -      +
    686J  TRP*     3.3     8.9    +      -       +      +
    688J  ALA*     1.3    75.7    -      -       -      +
    690J  ASN*     1.3    57.1    +      -       -      +
    692J  ARG*     3.2    15.2    +      -       -      +
    693J  VAL*     2.9    33.5    +      -       -      +
    743J  MET*     5.0     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 690 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    686J  TRP      2.9    14.6    +      -       -      +
    687J  ALA*     3.4    13.1    -      -       -      +
    688J  ALA      3.2     0.2    -      -       -      -
    689J  ALA*     1.3    77.4    -      -       -      +
    691J  ASP*     1.3    60.5    +      -       -      +
    693J  VAL*     3.3     4.0    +      -       -      +
    694J  SER*     2.9    25.9    +      -       -      -
    738J  ARG*     4.6    13.0    -      -       -      +
    743J  MET*     3.4    39.0    +      -       -      +
    745J  GLY*     3.4    25.1    -      -       -      +
    746J  LEU*     5.0     5.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 691 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687J  ALA*     3.0    18.3    +      -       -      +
    688J  ALA*     3.7     9.6    -      -       -      +
    690J  ASN*     1.3    76.3    +      -       -      +
    692J  ARG*     1.3    59.9    +      -       -      +
    694J  SER*     3.4    10.6    -      -       -      -
    695J  LYS*     2.9    38.4    +      -       +      +
    738J  ARG*     5.9     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 692 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    649J  LYS*     5.6     6.1    -      -       -      +
    653J  ILE*     3.9    36.5    +      -       +      +
    656J  GLU*     3.9    24.7    +      -       -      +
    688J  ALA*     3.0    20.9    +      -       -      +
    689J  ALA*     3.2    16.6    +      -       -      +
    691J  ASP*     1.3    76.5    -      -       -      +
    693J  VAL*     1.3    57.6    +      -       -      +
    695J  LYS*     3.4     7.0    +      -       -      +
    696J  ALA*     3.0    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 693 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647J  PRO*     5.0     4.7    -      -       +      +
    650J  LYS*     3.6    33.2    -      -       +      +
    653J  ILE*     3.7    28.7    -      -       +      -
    689J  ALA      2.9    18.9    +      -       -      +
    690J  ASN*     3.6     9.0    -      -       -      +
    692J  ARG*     1.3    74.0    -      -       -      +
    694J  SER*     1.3    58.9    +      -       -      +
    696J  ALA*     3.3     6.8    +      -       -      +
    697J  MET*     2.9    31.1    +      -       +      +
    738J  ARG*     6.5     0.4    -      -       +      -
    742J  GLY*     3.9    19.3    -      -       -      -
    743J  MET*     3.8    21.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 694 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    690J  ASN*     2.9    14.3    +      -       -      -
    691J  ASP*     3.4    17.9    +      -       -      -
    692J  ARG      3.2     0.2    -      -       -      -
    693J  VAL*     1.3    77.1    -      -       -      +
    695J  LYS*     1.3    59.6    +      -       -      +
    697J  MET*     3.3    11.7    -      -       -      +
    698J  MET*     3.0    33.0    +      -       -      +
    738J  ARG*     3.2    40.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 695 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    691J  ASP*     2.9    24.1    +      -       +      +
    692J  ARG*     3.8     6.3    -      -       -      +
    694J  SER*     1.3    75.9    -      -       -      +
    696J  ALA*     1.3    58.3    +      -       -      +
    698J  MET*     3.4     4.6    +      -       +      +
    699J  ASP*     3.0    39.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 696 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647J  PRO*     4.3    16.4    -      -       +      -
    649J  LYS*     4.9    15.9    -      -       +      -
    653J  ILE*     5.0     3.8    -      -       +      -
    692J  ARG      3.0    17.7    +      -       -      +
    693J  VAL*     3.6     8.3    -      -       -      +
    695J  LYS*     1.3    77.4    -      -       -      +
    697J  MET*     1.3    58.1    +      -       -      +
    699J  ASP*     3.8     4.6    -      -       -      +
    700J  ASN*     3.0    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 697 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645J  VAL      5.2     2.2    -      -       -      +
    647J  PRO*     3.7    24.3    -      -       +      +
    693J  VAL*     2.9    20.7    +      -       +      +
    694J  SER*     3.3     9.2    -      -       -      +
    696J  ALA*     1.3    76.8    -      -       -      +
    698J  MET*     1.3    68.4    +      -       +      +
    700J  ASN*     3.8     1.5    -      -       -      +
    701J  LEU*     2.9    55.3    +      -       +      +
    737J  ILE*     3.3    30.1    -      -       +      +
    738J  ARG*     3.7    20.6    -      -       -      +
    741J  ALA*     3.7    12.3    -      -       +      -
    742J  GLY*     3.5    28.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 698 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    694J  SER*     3.0    22.3    +      -       -      +
    695J  LYS*     3.9     5.8    -      -       +      +
    696J  ALA      3.3     0.2    -      -       -      -
    697J  MET*     1.3    81.0    -      -       +      +
    699J  ASP*     1.3    60.2    +      -       -      +
    701J  LEU*     3.9     6.2    -      -       -      +
    702J  GLN*     2.9    55.5    +      -       -      +
    723J  TYR*     4.6    17.3    -      -       -      -
    734J  ALA*     4.2    25.4    -      -       +      +
    737J  ILE*     4.7    15.3    -      -       +      -
    738J  ARG*     5.3     4.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 699 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    695J  LYS*     3.0    24.6    +      -       -      +
    696J  ALA*     3.8     4.8    -      -       -      +
    698J  MET*     1.3    76.8    -      -       -      +
    700J  ASN*     1.3    63.0    +      -       -      +
    702J  GLN*     3.2    15.3    +      -       -      +
    703J  THR*     3.0    41.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 700 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645J  VAL*     3.7    25.8    -      -       +      +
    646J  ILE      4.6     0.4    +      -       -      -
    647J  PRO*     4.2    20.4    -      -       +      +
    648J  GLU      5.2     1.2    -      -       -      +
    696J  ALA      3.0    18.9    +      -       -      +
    697J  MET*     4.2     5.2    -      -       -      +
    699J  ASP*     1.3    75.9    -      -       -      +
    701J  LEU*     1.3    62.9    +      -       -      +
    703J  THR*     5.3     1.3    -      -       -      -
    704J  GLU*     2.9    33.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 701 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    643J  ASP      4.7     3.1    -      -       -      +
    645J  VAL*     4.6    24.0    -      -       +      +
    697J  MET*     2.9    37.2    +      -       +      +
    698J  MET*     3.9     7.4    -      -       -      +
    700J  ASN*     1.3    79.1    -      -       +      +
    702J  GLN*     1.3    61.3    +      -       -      +
    704J  GLU*     2.9    27.9    +      -       +      +
    718J  SER*     3.3     8.4    +      -       -      -
    720J  ASN*     3.5    29.3    -      -       +      +
    722J  ILE*     4.7     6.5    -      -       +      -
    723J  TYR*     4.5    19.9    -      -       +      +
    737J  ILE*     3.9    30.1    -      -       +      -
    741J  ALA*     5.4     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 702 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    698J  MET*     2.9    38.9    +      -       -      +
    699J  ASP*     4.2    17.3    +      -       -      +
    701J  LEU*     1.3    72.2    -      -       -      +
    703J  THR*     1.3    61.1    +      -       +      +
    704J  GLU      3.6     0.2    -      -       -      -
    716J  GLN      3.8     0.3    -      -       -      +
    717J  VAL*     3.7    26.5    -      -       +      +
    718J  SER      4.4     2.5    -      -       -      -
    723J  TYR*     3.4    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 703 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    699J  ASP*     3.0    27.6    +      -       +      +
    700J  ASN*     4.6     1.3    -      -       -      -
    702J  GLN*     1.3    82.4    -      -       +      +
    704J  GLU*     1.3    61.3    +      -       -      +
    705J  THR      3.4     2.2    -      -       -      -
    706J  VAL*     4.3     9.0    -      -       -      +
    715J  LYS*     3.3    48.5    -      -       -      +
    716J  GLN      3.8     9.5    +      -       -      -
----------------------------------------------------------
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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