Contacts of the helix formed by residues 448 - 473 (chain B) in PDB entry 3RC0


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 448 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  GLU*     4.6     5.7    +      -       -      -
    446B  LYS      3.7     1.2    +      -       -      -
    447B  LEU*     1.3    75.5    -      -       -      +
    449B  TRP*     1.3    66.1    +      -       -      +
    450B  ARG*     3.8     7.3    +      -       -      +
    451B  GLU*     2.8    40.9    +      -       -      +
    452B  GLN*     2.9    20.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 449 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154B  GLU*     3.0    24.0    +      -       -      -
    447B  LEU      3.9     0.2    +      -       -      -
    448B  SER*     1.3    73.3    -      -       -      +
    450B  ARG*     1.3    58.5    +      -       +      +
    452B  GLN*     3.1    22.1    +      -       -      +
    453B  GLN*     3.0    47.5    +      -       +      +
    474B  EDO      3.5    37.0    -      -       -      -
    477B  EDO      3.2    38.6    -      -       -      -
    479B  EDO      3.3    27.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 450 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158B  PHE*     4.5     6.7    +      -       -      +
    159B  TRP*     3.4    45.3    -      -       +      +
    160B  PRO*     3.4    17.2    -      -       -      +
    163B  GLU*     2.9    34.3    +      -       -      +
    167B  LEU*     3.9     9.9    -      -       +      -
    448B  SER*     3.3     4.7    +      -       -      +
    449B  TRP*     1.3    76.3    -      -       +      +
    451B  GLU*     1.3    58.2    +      -       -      +
    453B  GLN*     3.4    10.0    +      -       -      +
    454B  ALA*     2.9    30.8    +      -       -      +
    479B  EDO      2.8    42.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 451 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  GLU*     5.1     2.3    -      -       -      +
    167B  LEU*     3.9    31.8    -      -       +      +
    447B  LEU*     3.5    26.7    -      -       +      +
    448B  SER*     2.8    39.6    +      -       -      +
    450B  ARG*     1.3    76.5    -      -       -      +
    452B  GLN*     1.3    59.6    +      -       -      +
    454B  ALA*     3.9     2.2    -      -       -      +
    455B  LEU*     2.9    30.7    +      -       -      +
    458B  ARG*     4.9     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 452 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    444B  TYR*     3.3    44.1    +      -       +      +
    445B  ALA*     3.6    14.1    +      -       -      +
    447B  LEU*     3.2    23.6    +      -       +      -
    448B  SER      2.9    16.3    +      -       -      +
    449B  TRP*     3.4    24.4    -      -       -      +
    451B  GLU*     1.3    74.9    -      -       -      +
    453B  GLN*     1.3    65.6    +      -       -      +
    455B  LEU*     3.3     6.8    +      -       -      +
    456B  GLN*     3.0    26.9    +      -       -      +
    474B  EDO      3.0    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 453 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    154B  GLU*     3.8     2.0    +      -       -      -
    159B  TRP*     3.7    10.0    -      -       -      -
    294B  ILE*     3.9    16.9    -      -       +      +
    298B  GLY      3.2    25.9    +      -       -      +
    299B  PHE*     3.9    11.3    -      -       -      +
    300B  VAL*     3.8    21.0    -      -       +      +
    449B  TRP*     3.0    49.7    +      -       +      +
    450B  ARG*     3.7     7.1    -      -       -      +
    452B  GLN*     1.3    74.1    -      -       -      +
    454B  ALA*     1.3    64.2    +      -       -      +
    456B  GLN*     3.2     5.0    +      -       -      +
    457B  VAL*     3.1    26.2    +      -       -      +
    474B  EDO      4.0     3.1    -      -       -      -
    477B  EDO      4.8     0.4    +      -       -      -
    479B  EDO      2.7    24.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 454 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159B  TRP*     4.6     1.8    -      -       +      -
    167B  LEU*     3.6    35.0    -      -       +      +
    168B  LEU*     3.8    17.9    -      -       +      -
    294B  ILE*     4.7     1.5    -      -       -      +
    450B  ARG      2.9    18.8    +      -       -      +
    451B  GLU*     3.9     3.1    -      -       -      +
    453B  GLN*     1.3    76.0    -      -       -      +
    455B  LEU*     1.3    62.8    +      -       -      +
    457B  VAL*     3.0     4.9    +      -       -      +
    458B  ARG*     3.0    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 455 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    434B  ASP*     3.1    49.1    -      -       +      +
    437B  LEU*     3.5    28.7    -      -       +      -
    438B  LEU*     4.3     8.3    -      -       +      +
    444B  TYR*     3.8    23.1    -      -       +      -
    447B  LEU*     3.7    18.4    -      -       +      -
    451B  GLU      2.9    19.6    +      -       -      +
    452B  GLN      3.5     4.5    -      -       -      +
    454B  ALA*     1.3    76.3    -      -       -      +
    456B  GLN*     1.3    56.8    +      -       -      +
    458B  ARG*     3.3    14.6    +      -       -      +
    459B  TYR*     2.8    38.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 456 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290B  ASN*     4.0    14.6    +      -       -      +
    300B  VAL*     3.8    14.8    -      -       +      -
    301B  GLU      4.1     1.1    -      -       -      +
    302B  PRO*     3.4    23.4    -      -       -      +
    303B  TYR*     3.0    29.7    +      -       -      +
    438B  LEU*     3.8    18.5    -      -       -      +
    444B  TYR*     2.9    29.3    +      -       +      +
    452B  GLN      3.0    18.8    +      -       -      +
    453B  GLN      3.2     8.7    +      -       -      +
    455B  LEU*     1.3    76.6    -      -       -      +
    457B  VAL*     1.3    62.1    +      -       -      +
    459B  TYR*     4.1     3.6    -      -       -      +
    460B  GLY*     3.3    17.7    +      -       -      -
    474B  EDO      3.9    12.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 457 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    168B  LEU*     4.2     8.1    -      -       +      -
    171B  THR*     3.7    27.8    -      -       +      +
    173B  VAL*     4.9     0.9    -      -       +      -
    290B  ASN*     4.2    11.5    -      -       +      +
    291B  TRP*     4.0    23.8    -      -       +      +
    294B  ILE*     4.1    18.4    -      -       +      -
    300B  VAL*     3.6    21.3    -      -       +      -
    309B  ASP*     5.0     1.0    -      -       -      +
    453B  GLN      3.1    16.5    +      -       -      +
    454B  ALA      3.0     7.7    +      -       -      +
    456B  GLN*     1.3    76.6    -      -       -      +
    458B  ARG*     1.3    65.7    +      -       -      +
    460B  GLY*     3.5     1.0    +      -       -      -
    461B  GLN*     3.4    23.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 458 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166B  CYS      5.7     0.7    -      -       -      -
    167B  LEU*     2.9    36.9    +      -       -      +
    169B  GLN      4.7     9.4    -      -       -      +
    171B  THR*     3.8    22.9    -      -       +      -
    427B  TYR*     4.7     7.6    -      -       +      -
    428B  ALA*     6.1     3.4    -      -       -      +
    429B  THR*     5.2     1.6    +      -       -      -
    434B  ASP*     3.0    38.0    +      -       -      +
    437B  LEU*     4.4     7.5    -      -       -      +
    451B  GLU      4.9     1.6    +      -       -      -
    454B  ALA*     3.0    31.4    +      -       -      +
    455B  LEU*     3.5    23.2    -      -       -      +
    457B  VAL*     1.3    73.9    -      -       -      +
    459B  TYR*     1.3    58.8    +      -       -      +
    461B  GLN*     3.2     6.1    +      -       -      +
    462B  LYS*     2.9    46.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 459 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303B  TYR*     3.5    38.8    -      +       +      -
    431B  LEU*     3.9    15.3    -      -       +      -
    434B  ASP*     4.2     8.2    +      -       +      -
    435B  GLN*     2.6    56.5    +      -       -      -
    438B  LEU*     3.4    32.1    -      -       +      -
    455B  LEU*     2.8    28.0    +      -       +      +
    456B  GLN*     4.1     4.0    -      -       -      +
    458B  ARG*     1.3    73.8    -      -       -      +
    460B  GLY*     1.3    58.9    +      -       -      +
    462B  LYS*     3.9     4.4    -      -       -      +
    463B  MET*     2.9    66.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 460 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290B  ASN*     5.8     0.2    -      -       -      -
    303B  TYR*     4.6    10.9    -      -       -      -
    309B  ASP*     3.5    22.4    -      -       -      +
    456B  GLN      3.3    13.5    +      -       -      -
    457B  VAL      4.1     0.2    -      -       -      -
    459B  TYR*     1.3    85.0    -      -       -      +
    461B  GLN*     1.3    59.8    +      -       -      +
    463B  MET*     3.8     5.1    -      -       -      +
    464B  ILE*     3.3    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 461 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  GLY      3.7     0.2    -      -       -      +
    171B  THR*     3.1    42.8    +      -       -      +
    291B  TRP*     3.6    28.7    -      -       -      +
    309B  ASP*     5.3     2.7    -      -       -      +
    310B  THR      3.6    17.0    +      -       -      +
    311B  ALA*     3.6    15.0    -      -       +      +
    312B  ASP      5.5     2.1    -      -       -      +
    427B  TYR*     2.5    35.7    +      -       -      +
    457B  VAL*     3.4    14.6    +      -       +      +
    458B  ARG      3.2     7.5    +      -       -      +
    459B  TYR      3.2     0.4    -      -       -      -
    460B  GLY*     1.3    75.0    -      -       -      +
    462B  LYS*     1.3    65.2    +      -       -      +
    464B  ILE*     3.2     5.4    +      -       -      +
    465B  LEU*     3.1    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 462 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    424B  LEU*     4.1    22.7    -      -       +      -
    427B  TYR*     3.7    33.7    -      -       +      +
    429B  THR*     2.9    40.1    +      -       -      +
    430B  ASP      3.4     3.8    +      -       -      -
    431B  LEU*     3.7    37.7    -      -       +      +
    434B  ASP*     2.5    29.7    +      -       -      +
    458B  ARG*     2.9    25.2    +      -       -      +
    459B  TYR      3.9     0.4    -      -       -      +
    461B  GLN*     1.3    76.6    -      -       -      +
    463B  MET*     1.3    56.4    +      -       -      +
    465B  LEU*     3.1     2.2    +      -       -      -
    466B  HIS*     2.8    36.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 463 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303B  TYR*     3.2    32.8    -      -       +      +
    431B  LEU*     3.9    22.2    -      -       +      -
    435B  GLN*     4.3     4.9    -      -       -      +
    459B  TYR*     2.9    60.7    +      -       +      +
    460B  GLY      3.8     4.9    -      -       -      +
    462B  LYS*     1.3    77.7    -      -       -      +
    464B  ILE*     1.3    63.1    +      -       +      +
    466B  HIS*     3.5     1.8    +      -       -      +
    467B  GLN*     3.1    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 464 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309B  ASP*     3.6     6.7    -      -       +      +
    310B  THR*     3.5    35.9    -      -       -      +
    311B  ALA*     4.2     5.8    -      -       +      -
    356B  ILE*     3.6    25.5    -      -       +      +
    357B  GLY      3.6    18.8    -      -       -      +
    358B  ARG*     3.6    35.7    -      -       +      +
    460B  GLY      3.3    15.0    +      -       -      +
    461B  GLN      3.2     7.5    +      -       -      +
    463B  MET*     1.3    76.7    -      -       +      +
    465B  LEU*     1.3    65.0    +      -       -      +
    467B  GLN*     3.2    11.8    +      -       -      +
    468B  LEU*     3.0    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 465 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311B  ALA*     3.8    18.8    -      -       +      -
    312B  ASP      4.7     0.7    -      -       -      +
    313B  ILE*     4.1    28.3    -      -       +      -
    356B  ILE*     5.0     4.5    -      -       +      -
    420B  VAL*     3.4    25.5    -      -       +      +
    423B  THR*     3.7    24.7    -      -       +      -
    424B  LEU*     3.9    17.9    -      -       +      -
    427B  TYR*     4.0    25.6    -      -       +      +
    461B  GLN      3.1    18.6    +      -       -      +
    462B  LYS      3.6     5.4    -      -       -      +
    464B  ILE*     1.3    76.8    -      -       -      +
    466B  HIS*     1.3    56.7    +      -       -      +
    468B  LEU*     2.9    11.7    +      -       +      +
    469B  LEU      2.9    23.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 466 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    424B  LEU*     3.4    33.9    -      -       +      +
    430B  ASP*     5.6     3.2    -      -       +      +
    431B  LEU*     3.5    46.9    +      -       +      +
    462B  LYS      2.8    28.8    +      -       -      +
    463B  MET      4.1     2.9    -      -       -      +
    465B  LEU*     1.3    69.5    -      -       -      +
    467B  GLN*     1.3    65.1    +      -       -      +
    469B  LEU*     3.3    19.0    +      -       +      +
    470B  GLU*     3.0    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 467 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357B  GLY      4.8     2.4    +      -       -      -
    358B  ARG*     2.8    33.2    +      -       -      +
    402B  ILE*     3.7    23.4    -      -       +      +
    463B  MET      3.1    14.5    +      -       -      +
    464B  ILE*     3.4    13.0    +      -       -      +
    465B  LEU      3.2     0.2    -      -       -      -
    466B  HIS*     1.3    76.9    -      -       -      +
    468B  LEU*     1.3    63.2    +      -       -      +
    470B  GLU*     3.4    17.5    +      -       -      +
    471B  LEU*     3.1    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 468 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313B  ILE*     4.0    16.4    -      -       +      -
    356B  ILE*     4.2    29.2    -      -       +      -
    361B  VAL*     5.5     2.2    -      -       +      -
    405B  ILE*     3.7    29.8    -      -       +      -
    416B  LEU*     4.3    20.9    -      -       +      -
    420B  VAL*     3.5    25.8    -      -       +      -
    464B  ILE      3.0    11.5    +      -       -      +
    465B  LEU*     2.9    14.7    +      -       +      +
    467B  GLN*     1.3    78.5    -      -       -      +
    469B  LEU*     1.3    61.3    +      -       -      +
    471B  LEU*     3.2     8.3    +      -       +      +
    472B  THR*     3.0    32.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 469 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    417B  GLN*     3.6    42.0    -      -       +      +
    420B  VAL*     3.8    13.0    -      -       +      -
    421B  LEU*     3.9    21.8    -      -       +      -
    424B  LEU*     3.5    29.8    -      -       +      -
    465B  LEU      2.9     7.7    +      -       -      +
    466B  HIS*     3.3    26.5    -      -       +      +
    468B  LEU*     1.3    75.4    -      -       -      +
    470B  GLU*     1.3    58.0    +      -       +      +
    472B  THR*     3.2     5.2    +      -       -      -
    473B  SER*     2.7    34.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 470 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466B  HIS*     3.0    19.9    +      -       +      +
    467B  GLN*     3.6    18.7    -      -       -      +
    468B  LEU      3.3     0.2    -      -       -      -
    469B  LEU*     1.3    77.7    -      -       +      +
    471B  LEU*     1.3    63.8    +      -       +      +
    473B  SER*     3.3    21.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 471 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    402B  ILE*     3.8    51.1    -      -       +      +
    405B  ILE*     3.9    26.6    -      -       +      +
    406B  PRO*     3.7    37.6    -      -       +      +
    413B  ARG*     4.3     1.6    -      -       -      -
    467B  GLN*     3.1    32.8    +      -       +      +
    468B  LEU*     3.2    10.3    +      -       +      +
    470B  GLU*     1.3    80.4    -      -       +      +
    472B  THR*     1.3    60.6    +      -       -      +
    473B  SER      3.2     2.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 472 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    405B  ILE*     3.7    21.3    -      -       +      -
    413B  ARG*     3.6    45.4    +      -       -      +
    416B  LEU*     4.0    27.6    -      -       +      -
    417B  GLN*     3.3    27.6    +      -       -      +
    420B  VAL*     5.6     0.4    -      -       +      +
    468B  LEU*     3.0    19.7    +      -       +      +
    469B  LEU*     3.2     8.7    +      -       -      -
    471B  LEU*     1.3    74.6    -      -       -      +
    473B  SER*     1.3    64.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 473 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    413B  ARG*     4.2    12.7    +      -       -      -
    417B  GLN*     3.5    21.5    +      -       -      +
    469B  LEU*     2.7    24.1    +      -       -      +
    470B  GLU*     3.5    16.9    -      -       -      -
    471B  LEU      3.2     4.3    -      -       -      -
    472B  THR*     1.3    82.5    -      -       -      +
----------------------------------------------------------
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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