Contacts of the helix formed by residues 657 - 682 (chain K) in PDB entry 6D6R


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 ARG 657 (chain K).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    590K  TYR*     3.8    17.2    -      -       +      +
    591K  ALA*     3.1    41.7    -      -       -      +
    594K  GLN*     4.1    28.8    -      -       +      +
    655K  GLU*     4.0    28.6    +      -       -      +
    656K  LEU*     1.3    80.6    +      -       -      +
    658K  GLU*     1.3    81.0    +      -       +      +
    659K  THR*     3.4     8.1    -      -       -      +
    660K  ASN*     3.3    20.6    +      -       +      +
    661K  SER*     3.6     5.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 658 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    594K  GLN*     5.1    11.9    -      -       +      +
    597K  ILE*     5.4    10.4    -      -       +      +
    598K  ASP*     5.2     4.9    -      -       -      +
    614K  ASN*     5.0    15.0    -      -       -      +
    618K  LYS*     2.9    38.9    +      -       -      -
    657K  ARG*     1.3    79.9    -      -       +      +
    659K  THR*     1.3    66.8    +      -       -      +
    661K  SER*     2.7    29.4    +      -       -      +
    662K  MET*     2.9     7.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 659 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478K  VAL*     3.6    20.6    -      -       +      -
    590K  TYR*     3.3    34.9    +      -       +      -
    593K  ALA*     3.7    24.1    -      -       +      +
    594K  GLN*     4.2     7.8    +      -       -      +
    597K  ILE*     4.2    10.1    -      -       +      +
    614K  ASN*     4.6     2.5    -      -       -      +
    657K  ARG*     3.4     5.0    -      -       -      +
    658K  GLU*     1.3    78.0    -      -       -      +
    660K  ASN*     1.3    63.0    +      -       -      +
    662K  MET*     3.3    22.8    +      -       +      +
    663K  VAL*     3.0    23.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 660 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    590K  TYR*     4.0    19.4    +      -       +      -
    655K  GLU      5.6     2.2    +      -       -      +
    656K  LEU*     4.7    17.8    -      -       +      +
    657K  ARG*     3.3    16.4    +      -       +      +
    658K  GLU      2.9     0.8    +      -       -      -
    659K  THR*     1.3    78.3    -      -       -      +
    661K  SER*     1.3    62.9    +      -       -      +
    663K  VAL*     3.1    12.2    -      -       -      +
    664K  GLU*     2.9    28.6    +      -       -      +
     60O    A      3.5    37.7    +      -       -      +
     61O    A      5.7     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 661 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617K  ALA*     5.1     2.6    -      -       -      +
    618K  LYS*     5.8     4.5    -      -       -      +
    621K  LYS*     4.3    28.4    -      -       -      +
    657K  ARG      3.6     5.4    +      -       -      -
    658K  GLU*     2.7    25.0    +      -       -      -
    660K  ASN*     1.3    77.9    -      -       -      +
    662K  MET*     1.3    62.0    +      -       -      +
    664K  GLU*     3.6    11.2    -      -       -      +
    665K  GLU*     2.9    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 662 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478K  VAL*     4.5    11.9    -      -       +      -
    490K  LEU*     3.7    14.8    -      -       +      -
    597K  ILE*     6.1     1.1    -      -       +      -
    610K  LEU*     5.3     9.0    -      -       +      -
    613K  LEU*     3.2    36.6    -      -       +      -
    614K  ASN*     3.4    27.4    -      -       -      +
    617K  ALA*     3.5    22.4    -      -       +      -
    658K  GLU      2.9     4.6    +      -       -      +
    659K  THR*     3.4    32.3    -      -       +      +
    660K  ASN      3.2     0.2    -      -       -      -
    661K  SER*     1.3    83.2    +      -       -      +
    663K  VAL*     1.3    85.7    +      -       +      +
    665K  GLU*     3.1     1.2    +      -       -      +
    666K  PHE*     3.0    27.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 663 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    478K  VAL*     5.5     8.1    -      -       +      -
    490K  LEU*     4.5     9.6    -      -       +      -
    590K  TYR*     4.5    15.3    -      -       +      +
    659K  THR*     3.0    13.3    +      -       +      +
    660K  ASN*     3.1    21.8    -      -       -      +
    662K  MET*     1.3    94.2    -      -       +      +
    664K  GLU*     1.3    67.4    +      -       -      +
    666K  PHE*     3.4     3.3    +      -       -      +
    667K  MET*     2.9    57.0    +      -       +      +
   2001K   MG      4.5    13.2    -      -       -      -
     60O    A      4.5     8.1    -      -       -      +
     61O    A      4.8     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 664 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    621K  LYS*     5.8     3.1    +      -       -      -
    624K  ARG*     5.2     4.7    +      -       -      -
    660K  ASN*     2.9    27.0    +      -       -      +
    661K  SER*     3.6     9.8    -      -       -      +
    663K  VAL*     1.3    78.9    -      -       -      +
    665K  GLU*     1.3    65.0    +      -       +      +
    667K  MET*     3.3     1.9    +      -       -      +
    668K  LEU*     2.9    46.6    +      -       +      +
     59O    A      3.2    29.2    +      -       -      +
     60O    A      3.3    38.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 665 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617K  ALA*     4.2    11.7    -      -       -      +
    620K  LEU*     4.2    20.0    -      -       +      +
    621K  LYS*     2.8    45.0    -      -       +      +
    624K  ARG*     2.2    48.9    +      -       -      +
    661K  SER*     2.9    21.4    +      -       -      +
    662K  MET*     3.7     4.0    -      -       -      +
    664K  GLU*     1.3    78.0    -      -       +      +
    666K  PHE*     1.3    66.6    +      -       +      +
    668K  LEU*     3.3     5.1    +      -       -      +
    669K  LEU*     2.9    25.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 666 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    490K  LEU*     4.6     9.4    -      -       +      -
    502K  VAL*     3.8    34.1    -      -       +      -
    504K  VAL*     4.5    17.1    -      -       +      +
    564K  TRP*     4.6     3.8    -      +       -      -
    566K  MET*     5.4     4.7    -      -       +      -
    613K  LEU*     3.2    52.0    -      -       +      -
    616K  LEU*     4.1    11.0    -      -       +      -
    617K  ALA*     3.7    22.2    -      -       +      -
    620K  LEU*     4.6    13.9    -      -       +      -
    662K  MET*     3.0    29.8    +      -       +      +
    663K  VAL      3.9     3.8    -      -       -      +
    665K  GLU*     1.3    76.7    -      -       +      +
    667K  MET*     1.3    59.9    +      -       +      +
    669K  LEU*     3.3    12.7    +      -       +      +
    670K  ALA*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 667 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    488K  ASP*     3.3    41.3    -      -       +      +
    489K  ALA      4.7     1.8    -      -       -      +
    490K  LEU*     3.7    26.7    -      -       +      -
    504K  VAL*     4.6    19.3    -      -       +      -
    506K  ILE*     4.8     2.2    -      -       +      -
    663K  VAL*     2.9    32.4    +      -       +      +
    664K  GLU*     3.8     3.8    -      -       -      +
    666K  PHE*     1.3    76.2    -      -       +      +
    668K  LEU*     1.3    58.7    +      -       -      +
    670K  ALA*     3.3     5.6    +      -       -      +
    671K  ASN*     2.9    35.8    +      -       -      +
    776K  THR*     3.5    28.5    -      -       +      +
     60O    A      4.2    14.6    -      -       -      +
     61O    A      4.2     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 668 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    624K  ARG*     3.2    36.1    -      -       -      +
    664K  GLU*     2.9    46.1    +      -       +      +
    665K  GLU*     3.7     4.0    -      -       -      +
    667K  MET*     1.3    73.9    -      -       -      +
    669K  LEU*     1.3    65.9    +      -       -      +
    671K  ASN*     3.3     3.9    +      -       -      +
    672K  ILE*     2.9    33.0    +      -       +      +
    767K  LEU*     3.9    16.6    -      -       +      -
    772K  TYR*     3.0    38.8    -      -       +      +
     59O    A      4.1     6.5    -      -       -      +
     60O    A      3.8    14.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 669 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    564K  TRP*     4.1    18.4    -      -       +      -
    566K  MET*     3.7    31.0    -      -       +      -
    572K  ILE*     4.3    17.5    -      -       +      -
    620K  LEU*     4.2    25.1    -      -       +      -
    665K  GLU      2.9    13.5    +      -       -      +
    666K  PHE*     3.3    13.7    +      -       +      +
    668K  LEU*     1.3    77.0    -      -       -      +
    670K  ALA*     1.3    62.6    +      -       -      +
    672K  ILE*     3.3    12.4    +      -       +      +
    673K  SER*     3.0    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 670 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    504K  VAL*     3.8    18.4    -      -       +      -
    562K  CYS*     5.1     3.6    -      -       +      -
    564K  TRP*     3.4    25.3    -      -       +      -
    577K  PHE*     5.0     0.2    -      -       -      -
    666K  PHE      3.0    12.4    +      -       -      +
    667K  MET*     3.5    11.4    -      -       -      +
    668K  LEU      3.2     0.2    -      -       -      -
    669K  LEU*     1.3    76.3    -      -       -      +
    671K  ASN*     1.3    62.6    +      -       -      +
    673K  SER*     3.3     1.6    +      -       -      -
    674K  VAL*     2.9    30.6    +      -       +      +
    775K  PHE*     5.3     9.4    -      -       +      -
    776K  THR*     5.3     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 671 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    667K  MET*     2.9    27.5    +      -       -      +
    668K  LEU*     3.3     2.4    +      -       -      +
    670K  ALA*     1.3    76.3    -      -       -      +
    672K  ILE*     1.3    57.5    +      -       -      +
    674K  VAL*     3.4     0.5    +      -       -      +
    675K  ALA*     2.9    30.7    +      -       -      +
    772K  TYR*     3.1    36.8    +      -       +      -
    773K  THR*     2.9    21.7    -      -       -      +
    774K  HIS*     4.1     2.3    -      -       -      +
    775K  PHE*     2.6    41.3    +      -       -      +
    776K  THR*     3.8    13.4    +      -       -      +
    781K  ARG*     6.0     0.8    -      -       -      +
     60O    A      4.6     4.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 672 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    624K  ARG*     5.7     4.5    -      -       -      +
    627K  LYS*     6.1     2.2    -      -       -      +
    668K  LEU*     2.9    27.1    +      -       +      +
    669K  LEU*     3.8    12.1    -      -       +      +
    671K  ASN*     1.3    75.3    -      -       -      +
    673K  SER*     1.3    64.4    +      -       -      +
    675K  ALA*     3.2     6.7    +      -       -      +
    676K  LYS*     2.9    50.3    +      -       +      +
    767K  LEU*     4.8     9.9    -      -       +      -
    769K  SER*     4.5    18.2    -      -       -      -
    770K  PRO*     6.3     1.1    -      -       +      -
    771K  ILE*     4.0    16.8    -      -       +      +
    772K  TYR*     3.9    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 673 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    564K  TRP*     3.5    26.3    +      -       -      -
    572K  ILE*     4.4     8.8    -      -       -      +
    575K  THR*     5.8     1.5    -      -       -      +
    577K  PHE*     3.8    19.3    -      -       -      -
    669K  LEU*     3.0    18.8    +      -       -      +
    670K  ALA      3.8     3.1    -      -       -      -
    672K  ILE*     1.3    78.8    -      -       -      +
    674K  VAL*     1.3    63.3    +      -       -      +
    676K  LYS*     3.3    10.2    +      -       -      +
    677K  LYS*     3.0    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 674 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    562K  CYS*     5.3     1.3    -      -       -      -
    577K  PHE*     3.4    27.1    -      -       +      -
    670K  ALA*     2.9    21.5    +      -       +      +
    671K  ASN      3.7     3.8    -      -       -      +
    673K  SER*     1.3    75.6    -      -       -      +
    675K  ALA*     1.3    58.8    +      -       -      +
    677K  LYS*     3.3     2.6    +      -       -      +
    678K  ILE*     2.9    33.8    +      -       +      +
    773K  THR*     4.4     3.1    -      -       +      -
    775K  PHE*     3.6    37.0    -      -       +      -
    787K  VAL*     3.7    29.8    -      -       +      -
    791K  LEU*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 675 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    671K  ASN      2.9    13.1    +      -       -      +
    672K  ILE*     3.5     5.4    -      -       -      +
    673K  SER      3.1     0.2    -      -       -      -
    674K  VAL*     1.3    74.1    -      -       -      +
    676K  LYS*     1.3    65.2    +      -       -      +
    678K  ILE*     3.4     6.4    -      -       -      +
    679K  HIS*     2.9    27.0    +      -       -      +
    688K  LEU*     5.2     2.9    -      -       +      +
    771K  ILE*     3.3    28.0    -      -       +      +
    772K  TYR      4.3     0.4    -      -       -      -
    773K  THR*     3.3    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 676 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    672K  ILE*     2.9    39.9    +      -       +      +
    673K  SER*     3.7     8.3    -      -       -      +
    675K  ALA*     1.3    75.2    -      -       -      +
    677K  LYS*     1.3    56.9    +      -       -      +
    679K  HIS*     3.6     5.3    -      -       -      +
    680K  GLU*     2.9    45.0    +      -       +      +
    770K  PRO*     5.9     6.5    -      -       -      -
    771K  ILE*     4.5    19.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 677 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    577K  PHE*     3.4    33.3    -      -       +      -
    673K  SER      3.0    16.3    +      -       -      +
    674K  VAL*     3.6     5.6    -      -       -      +
    675K  ALA      3.2     0.2    -      -       -      -
    676K  LYS*     1.3    78.1    -      -       -      +
    678K  ILE*     1.3    56.7    +      -       -      +
    679K  HIS      3.0     0.3    +      -       -      -
    680K  GLU*     3.3     8.0    +      -       -      +
    681K  GLU*     3.0    47.8    +      -       +      +
    791K  LEU*     3.7    16.6    -      -       +      -
    794K  ALA*     5.1     8.8    +      -       +      -
    795K  ILE*     3.5    31.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 678 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    674K  VAL*     2.9    20.9    +      -       +      +
    675K  ALA*     3.4    15.3    -      -       -      +
    677K  LYS*     1.3    75.2    -      -       -      +
    679K  HIS*     1.3    57.6    +      -       +      +
    681K  GLU*     4.6     1.8    -      -       -      -
    682K  PHE*     3.0    41.8    +      -       +      +
    686K  ALA*     4.8    11.5    -      -       +      +
    687K  LEU      4.5    11.4    -      -       -      +
    688K  LEU*     5.2     3.1    -      -       +      -
    773K  THR*     4.5     6.3    -      -       +      -
    787K  VAL*     4.2    22.9    -      -       +      +
    790K  LEU*     4.5    17.7    -      -       +      -
    791K  LEU*     3.7    44.2    -      -       +      +
    794K  ALA*     5.3     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 679 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    675K  ALA      2.9    18.9    +      -       -      +
    676K  LYS*     3.6     6.9    +      -       -      +
    678K  ILE*     1.3    75.6    -      -       +      +
    680K  GLU*     1.3    73.3    +      -       -      +
    681K  GLU      3.1     1.1    -      -       -      -
    682K  PHE      2.6    29.3    -      -       -      +
    683K  SER*     3.6    16.9    +      -       -      -
    686K  ALA*     5.8     1.3    -      -       -      -
    688K  LEU*     4.6    17.9    -      -       +      -
    756K  SER*     4.6     7.4    -      -       -      -
    762K  PHE*     3.4    38.7    -      +       -      -
    771K  ILE*     5.4    11.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 680 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    676K  LYS*     2.9    27.7    +      -       +      +
    677K  LYS*     3.8     7.0    -      -       -      +
    679K  HIS*     1.3    81.4    +      -       -      +
    681K  GLU*     1.3    67.6    +      -       +      +
    682K  PHE      5.0     0.2    -      -       -      -
    683K  SER*     5.3     1.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 681 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    677K  LYS*     3.0    35.9    +      -       +      +
    678K  ILE*     4.6     0.2    -      -       -      -
    680K  GLU*     1.3    85.3    -      -       +      +
    682K  PHE*     1.3    77.3    +      -       +      +
    683K  SER      4.2     0.7    +      -       -      -
    794K  ALA*     4.4    24.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 682 (chain K). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    678K  ILE*     3.0    30.4    +      -       +      +
    679K  HIS*     2.6    24.4    -      -       -      +
    681K  GLU*     1.3    88.3    -      -       +      +
    683K  SER*     1.3    58.3    +      -       -      +
    684K  GLU*     3.6     2.5    -      -       -      +
    685K  HIS*     3.1    57.3    -      +       +      +
    686K  ALA*     4.8     3.1    -      -       +      +
    756K  SER*     4.5     2.8    +      -       -      -
    790K  LEU*     3.6    28.3    -      -       +      -
    793K  VAL*     3.7    24.7    -      -       +      -
    794K  ALA*     3.8    17.3    -      -       +      -
    804K  LEU*     6.3     0.4    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il