Contacts of the helix formed by residues 674 - 702 (chain D) in PDB entry 6PB4


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 D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668D  PHE*     4.0     5.8    -      -       -      -
    672D  LEU      5.5     1.1    -      -       -      +
    673D  VAL*     1.3    81.9    -      -       -      +
    675D  ALA*     1.3    60.5    +      -       -      +
    676D  GLY*     3.3     3.3    +      -       -      -
    677D  GLU*     2.8    37.5    +      -       +      +
    678D  ARG*     3.0    24.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 675 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    668D  PHE*     4.7     8.3    -      -       +      -
    674D  THR*     1.3    76.5    -      -       -      +
    676D  GLY*     1.3    53.6    +      -       -      +
    677D  GLU      3.3     0.2    -      -       -      -
    678D  ARG*     3.1    10.9    +      -       -      +
    679D  TYR*     2.3    41.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 676 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674D  THR*     3.3     4.0    +      -       -      -
    675D  ALA*     1.3    77.9    -      -       -      +
    677D  GLU*     1.3    55.8    +      -       -      +
    679D  TYR*     3.8     8.7    -      -       -      -
    680D  ASN*     2.6    44.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 677 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664D  ILE*     5.8     2.0    -      -       +      -
    673D  VAL*     3.3    36.1    -      -       +      +
    674D  THR*     2.8    31.1    +      -       +      +
    676D  GLY*     1.3    69.3    -      -       -      +
    678D  ARG*     1.3    66.5    +      -       -      +
    680D  ASN*     3.9     3.5    -      -       -      +
    681D  LYS*     3.0    30.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 678 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661D  VAL      5.4     1.2    +      -       -      -
    664D  ILE*     3.9    32.4    +      -       +      +
    665D  GLN*     2.3    45.5    +      -       -      +
    668D  PHE*     3.7    35.3    -      -       -      +
    673D  VAL*     4.2     5.8    -      -       +      -
    674D  THR      3.0    22.4    +      -       -      +
    675D  ALA*     3.1     8.4    +      -       -      +
    677D  GLU*     1.3    77.8    -      -       -      +
    679D  TYR*     1.3    58.1    +      -       -      +
    681D  LYS*     4.0     0.3    -      -       -      +
    682D  VAL*     2.9    45.3    +      -       +      +
    756D  GLU*     6.3     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 679 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    675D  ALA*     2.3    32.5    +      -       +      +
    676D  GLY*     3.5     9.4    -      -       -      +
    677D  GLU      3.1     0.2    -      -       -      -
    678D  ARG*     1.3    70.5    -      -       -      +
    680D  ASN*     1.3    78.7    +      -       -      +
    682D  VAL*     3.3     4.3    +      -       -      +
    683D  ILE*     3.0    32.0    +      -       +      +
    753D  SER*     5.1     1.6    -      -       -      -
    754D  ILE*     2.4    51.6    +      -       +      +
    755D  ILE      5.3     0.7    -      -       -      -
    756D  GLU*     3.1    41.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 680 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676D  GLY*     2.6    30.2    +      -       -      +
    677D  GLU*     4.1     3.7    -      -       -      +
    679D  TYR*     1.3    85.9    -      -       -      +
    681D  LYS*     1.3    57.7    +      -       -      +
    683D  ILE*     2.9    26.3    -      -       -      +
    684D  ASP*     2.9    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 681 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664D  ILE*     4.9    14.1    -      -       +      -
    677D  GLU*     3.0    20.0    +      -       +      +
    678D  ARG      4.2     1.6    -      -       -      +
    680D  ASN*     1.3    74.3    -      -       -      +
    682D  VAL*     1.3    66.3    +      -       -      +
    684D  ASP*     3.2    19.7    +      -       +      +
    685D  ILE*     3.0    37.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 682 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661D  VAL*     4.4     8.7    -      -       +      -
    664D  ILE*     4.0    27.8    -      -       +      -
    678D  ARG*     2.9    38.3    +      -       +      +
    679D  TYR*     3.8     4.3    -      -       -      +
    681D  LYS*     1.3    77.5    -      -       -      +
    683D  ILE*     1.3    61.9    +      -       -      +
    685D  ILE*     3.0    26.8    -      -       +      +
    686D  TRP*     3.0    38.8    +      -       +      +
    756D  GLU*     4.8    11.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 683 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    679D  TYR*     3.0    24.1    +      -       +      +
    680D  ASN*     2.9    33.7    -      -       -      +
    682D  VAL*     1.3    76.7    -      -       -      +
    684D  ASP*     1.3    67.3    +      -       -      +
    686D  TRP*     3.9     6.8    -      -       +      +
    687D  ALA*     2.9    28.0    +      -       +      +
    746D  LEU*     4.0    21.1    -      -       +      -
    754D  ILE*     3.4    40.2    -      -       +      -
    755D  ILE      4.8     2.2    -      -       -      +
    756D  GLU*     5.8     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 684 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    680D  ASN*     2.9    32.5    +      -       -      +
    681D  LYS*     3.4    29.0    +      -       +      +
    682D  VAL      3.2     0.2    -      -       -      -
    683D  ILE*     1.3    81.1    -      -       -      +
    685D  ILE*     1.3    59.5    +      -       +      +
    687D  ALA*     3.4     4.4    +      -       -      +
    688D  ALA*     3.0    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 685 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    657D  ALA*     4.8    15.0    -      -       +      +
    660D  GLU*     5.0     8.7    -      -       +      +
    661D  VAL*     3.7    36.1    -      -       +      +
    664D  ILE*     5.8     1.8    -      -       +      -
    681D  LYS*     3.0    26.8    +      -       +      +
    682D  VAL*     3.0    29.6    -      -       +      +
    684D  ASP*     1.3    76.8    -      -       +      +
    686D  TRP*     1.3    61.4    +      -       +      +
    688D  ALA*     3.3     7.6    +      -       -      +
    689D  ALA*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 686 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    654D  ILE*     5.8    12.1    -      -       +      -
    657D  ALA*     5.3     9.4    -      -       +      -
    658D  GLU*     5.4    10.8    -      -       +      -
    661D  VAL*     3.4    30.9    -      -       +      +
    682D  VAL*     3.0    51.0    +      -       +      +
    683D  ILE*     4.0     5.6    -      -       -      +
    685D  ILE*     1.3    80.8    -      -       +      +
    687D  ALA*     1.3    57.4    +      -       -      +
    689D  ALA*     3.2    12.1    +      -       +      +
    690D  ASN*     2.9    26.7    +      -       -      +
    743D  MET*     4.7    10.7    -      -       +      +
    746D  LEU*     5.4     5.1    -      -       +      +
    756D  GLU      4.1    10.6    +      -       -      +
    757D  THR*     5.3    10.3    -      -       +      -
    758D  PRO*     3.4    41.7    -      -       +      -
    759D  ILE      6.0     0.9    -      -       -      -
    760D  THR*     5.6    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 687 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    683D  ILE*     2.9    22.6    +      -       +      +
    684D  ASP*     3.8     5.4    -      -       -      +
    686D  TRP*     1.3    75.4    -      -       -      +
    688D  ALA*     1.3    59.2    +      -       -      +
    690D  ASN*     3.2     9.9    +      -       -      +
    691D  ASP*     2.9    36.3    +      -       -      +
    746D  LEU*     5.3    10.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 688 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    684D  ASP      3.0    17.4    +      -       -      +
    685D  ILE*     3.6     8.5    -      -       -      +
    687D  ALA*     1.3    78.5    -      -       -      +
    689D  ALA*     1.3    56.1    +      -       -      +
    691D  ASP*     3.1    12.7    +      -       -      +
    692D  ARG*     2.9    39.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 689 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653D  ILE*     4.1    24.8    -      -       +      +
    654D  ILE*     6.3     0.9    -      -       -      -
    657D  ALA*     4.9    12.3    -      -       +      -
    685D  ILE      2.9    14.2    +      -       -      +
    686D  TRP*     3.2    17.0    +      -       +      +
    688D  ALA*     1.3    72.9    -      -       -      +
    690D  ASN*     1.3    64.8    +      -       -      +
    692D  ARG*     3.3     6.5    +      -       -      +
    693D  VAL*     2.9    29.9    +      -       +      +
    743D  MET*     4.2     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 690 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    686D  TRP      2.9    10.6    +      -       -      +
    687D  ALA*     3.3    13.6    -      -       -      +
    689D  ALA*     1.3    76.3    -      -       -      +
    691D  ASP*     1.3    67.0    +      -       -      +
    693D  VAL*     3.2     3.6    +      -       -      +
    694D  SER*     2.9    20.4    +      -       -      -
    738D  ARG*     3.9    21.4    -      -       -      +
    743D  MET*     3.0    44.9    +      -       -      +
    745D  GLY*     3.8    27.3    -      -       -      +
    746D  LEU*     5.4     5.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 691 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    687D  ALA*     2.9    26.7    +      -       -      +
    688D  ALA*     3.1    11.3    +      -       -      +
    690D  ASN*     1.3    81.3    +      -       -      +
    692D  ARG*     1.3    59.3    +      -       +      +
    694D  SER*     3.3     8.3    +      -       -      -
    695D  LYS*     2.9    28.5    +      -       -      +
    738D  ARG*     5.4     6.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 692 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    653D  ILE*     4.1    43.2    -      -       +      +
    656D  GLU*     4.5    12.5    +      -       -      -
    688D  ALA*     2.9    26.8    +      -       +      +
    689D  ALA*     3.6     8.7    -      -       -      +
    691D  ASP*     1.3    76.4    -      -       +      +
    693D  VAL*     1.3    55.8    +      -       -      +
    695D  LYS*     3.3    25.8    +      -       -      +
    696D  ALA*     2.9    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 693 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647D  PRO*     4.7     7.0    -      -       +      +
    649D  LYS      5.3     0.4    -      -       -      -
    650D  LYS*     4.2    43.7    -      -       +      +
    653D  ILE*     4.8    17.3    -      -       +      -
    654D  ILE*     5.8     1.8    -      -       +      -
    689D  ALA*     2.9    19.0    +      -       +      +
    690D  ASN*     3.5     7.6    -      -       -      +
    692D  ARG*     1.3    76.9    -      -       -      +
    694D  SER*     1.3    63.5    +      -       -      +
    696D  ALA*     3.2     7.0    +      -       -      +
    697D  MET*     3.0    25.1    +      -       -      +
    738D  ARG*     6.3     0.7    -      -       +      -
    742D  GLY*     4.3    17.0    -      -       -      -
    743D  MET*     3.8    20.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 694 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    690D  ASN*     2.9    12.5    +      -       -      -
    691D  ASP*     3.5    10.8    -      -       -      -
    693D  VAL*     1.3    76.8    -      -       -      +
    695D  LYS*     1.3    58.4    +      -       -      +
    697D  MET*     3.0    14.7    -      -       -      +
    698D  MET*     2.9    31.5    +      -       -      +
    738D  ARG*     2.9    47.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 695 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    691D  ASP      2.9    13.4    +      -       -      +
    692D  ARG*     3.6    33.3    +      -       -      +
    694D  SER*     1.3    76.0    -      -       -      +
    696D  ALA*     1.3    64.6    +      -       -      +
    698D  MET*     3.2     5.9    +      -       +      +
    699D  ASP*     2.9    40.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 696 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647D  PRO*     4.5    12.6    -      -       +      -
    649D  LYS*     4.5    29.4    -      -       +      +
    653D  ILE*     5.6     2.0    -      -       +      -
    692D  ARG      2.9    16.9    +      -       -      +
    693D  VAL*     3.6     7.9    -      -       -      +
    695D  LYS*     1.3    79.1    -      -       -      +
    697D  MET*     1.3    57.8    +      -       -      +
    699D  ASP*     3.3     5.1    +      -       -      +
    700D  ASN*     2.9    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 697 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647D  PRO*     3.7    27.5    -      -       +      +
    693D  VAL*     3.0    14.6    +      -       -      +
    694D  SER*     3.0    27.4    -      -       -      +
    696D  ALA*     1.3    77.1    -      -       -      +
    698D  MET*     1.3    60.1    +      -       +      +
    700D  ASN*     4.1     4.3    -      -       -      -
    701D  LEU*     2.9    57.2    +      -       +      +
    737D  ILE*     4.2    20.0    -      -       +      +
    738D  ARG*     4.4    11.2    -      -       -      -
    741D  ALA*     3.3    34.5    -      -       +      -
    742D  GLY*     4.0    14.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 698 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    694D  SER*     2.9    20.5    +      -       -      +
    695D  LYS*     3.6     7.9    -      -       -      +
    696D  ALA      3.2     0.2    -      -       -      -
    697D  MET*     1.3    80.2    -      -       +      +
    699D  ASP*     1.3    63.2    +      -       -      +
    701D  LEU*     5.0     2.0    -      -       -      -
    702D  GLN*     2.8    66.0    +      -       +      +
    723D  TYR*     4.6    18.6    -      -       +      -
    734D  ALA*     5.0    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 699 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    695D  LYS*     2.9    36.1    +      -       -      +
    696D  ALA*     3.9     4.6    -      -       -      +
    698D  MET*     1.3    81.4    -      -       -      +
    700D  ASN*     1.3    59.1    +      -       -      +
    701D  LEU      3.4     0.2    -      -       -      -
    702D  GLN*     4.9     3.0    -      -       -      +
    703D  THR*     4.1    22.7    +      -       +      +
    704D  GLU*     3.5    10.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 700 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645D  VAL*     5.9     1.9    -      -       -      +
    646D  ILE      4.7     1.6    +      -       -      -
    647D  PRO*     3.5    29.7    -      -       +      +
    648D  GLU      4.4     1.6    -      -       -      +
    649D  LYS*     4.0    20.1    -      -       -      +
    696D  ALA      2.9    18.0    +      -       -      +
    697D  MET*     3.8     7.4    -      -       -      +
    698D  MET      3.1     0.4    -      -       -      -
    699D  ASP*     1.3    77.1    -      -       -      +
    701D  LEU*     1.3    69.7    +      -       +      +
    704D  GLU*     3.1    40.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 701 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    645D  VAL*     3.6    45.8    -      -       +      +
    646D  ILE      5.9     1.1    -      -       -      -
    647D  PRO*     5.6     0.9    -      -       +      -
    697D  MET*     2.9    50.0    +      -       +      +
    698D  MET*     4.4     2.2    -      -       -      +
    700D  ASN*     1.3    90.2    -      -       +      +
    702D  GLN*     1.3    65.0    +      -       -      +
    703D  THR      3.5     1.3    +      -       -      -
    704D  GLU*     4.3     6.0    +      -       -      +
    705D  THR*     5.5     3.1    -      -       -      +
    718D  SER*     3.1    15.4    +      -       -      -
    720D  ASN*     3.3    34.9    -      -       +      +
    723D  TYR*     6.4     0.2    -      -       -      -
    737D  ILE*     5.8     2.9    -      -       +      -
    741D  ALA*     5.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 702 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    698D  MET*     2.8    41.3    +      -       +      +
    699D  ASP*     4.9     0.7    -      -       -      +
    701D  LEU*     1.3    72.2    -      -       -      +
    703D  THR*     1.3    69.1    +      -       +      +
    704D  GLU      3.7     0.4    +      -       -      -
    705D  THR*     6.1     0.2    -      -       -      +
    716D  GLN      4.2     2.6    -      -       -      +
    717D  VAL*     5.3     1.7    -      -       -      -
    718D  SER*     2.0    41.6    +      -       -      -
    723D  TYR*     3.3    53.5    +      -       -      -
    724D  MET*     4.6     6.2    -      -       -      +
----------------------------------------------------------
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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