Contacts of the helix formed by residues 324 - 349 (chain N) in PDB entry 5A31


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 TRP 324 (chain N).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297N  VAL*     4.4    10.8    -      -       +      -
    300N  LEU*     3.6    44.2    -      -       +      -
    301N  GLY*     4.1     4.9    -      -       -      -
    304N  PHE*     3.0    54.7    -      +       +      -
    321N  LEU*     3.3    53.1    +      -       +      +
    322N  ARG      3.2     1.0    +      -       -      -
    323N  ARG*     1.3    81.9    -      -       +      +
    325N  ARG*     1.3    66.9    +      -       -      +
    326N  CYS      3.2     0.9    -      -       -      -
    327N  HIS*     3.4     7.5    +      -       +      +
    328N  VAL*     3.1    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 325 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290N  HIS      5.0     3.4    +      -       -      -
    293N  ILE*     4.5     9.0    -      -       +      +
    294N  GLU*     4.0    28.2    -      -       -      +
    297N  VAL*     3.6    25.3    -      -       +      +
    321N  LEU      4.4     4.4    +      -       -      +
    322N  ARG*     3.1    17.8    +      -       -      +
    324N  TRP*     1.3    77.9    -      -       -      +
    326N  CYS*     1.3    59.4    +      -       -      +
    328N  VAL*     3.3     2.6    +      -       -      +
    329N  GLN*     2.9    44.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 326 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322N  ARG*     3.1    16.1    +      -       -      +
    323N  ARG*     4.6    26.2    -      -       -      +
    324N  TRP      3.2     0.2    -      -       -      -
    325N  ARG*     1.3    79.3    -      -       -      +
    327N  HIS*     1.3    64.9    +      -       -      +
    329N  GLN*     3.4    11.0    +      -       -      +
    330N  ARG*     3.1    38.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 327 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262N  THR*     4.7     8.4    +      -       -      -
    265N  LEU*     5.8     1.3    -      -       +      -
    266N  HIS*     4.0    25.3    +      +       -      -
    323N  ARG      3.9    13.4    +      -       -      +
    324N  TRP*     3.4    12.6    +      +       +      +
    325N  ARG      3.4     0.4    -      -       -      -
    326N  CYS*     1.3    78.3    -      -       -      +
    328N  VAL*     1.3    75.0    +      -       +      +
    330N  ARG*     3.4    20.0    -      -       +      +
    331N  PHE*     3.1    30.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 328 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265N  LEU*     3.9    37.5    -      -       +      -
    269N  THR*     5.6     1.8    -      -       +      -
    292N  TRP*     5.5     4.0    -      -       +      -
    293N  ILE*     4.0    28.0    -      -       +      -
    296N  VAL*     4.6    14.8    -      -       +      -
    297N  VAL*     5.1     2.7    -      -       +      -
    300N  LEU*     4.8     9.6    -      -       +      -
    324N  TRP      3.1    15.7    +      -       -      +
    325N  ARG*     4.1     2.5    -      -       -      +
    327N  HIS*     1.3    83.8    -      -       +      +
    329N  GLN*     1.3    61.2    +      -       -      +
    331N  PHE*     3.6     6.0    -      -       +      +
    332N  PHE*     2.8    30.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 329 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290N  HIS*     4.1    21.3    -      -       +      +
    293N  ILE*     4.1    25.7    -      -       +      +
    325N  ARG*     2.9    33.4    +      -       +      +
    326N  CYS*     3.7    10.6    -      -       -      +
    328N  VAL*     1.3    76.1    -      -       -      +
    330N  ARG*     1.3    58.5    +      -       -      +
    332N  PHE*     3.2     2.4    +      -       -      +
    333N  TYR*     2.9    58.7    +      -       +      +
    367N  ARG*     4.0    14.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 330 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323N  ARG*     5.2     8.3    -      -       -      +
    326N  CYS*     3.1    24.8    +      -       -      +
    327N  HIS*     3.4    23.1    -      -       +      +
    329N  GLN*     1.3    76.5    -      -       -      +
    331N  PHE*     1.3    65.9    +      -       -      +
    333N  TYR*     3.4     8.1    +      -       -      +
    334N  ARG*     3.0    58.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 331 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265N  LEU*     4.1    10.5    -      -       +      -
    266N  HIS*     3.2    64.6    -      +       +      -
    269N  THR*     4.1    12.1    -      -       +      -
    270N  ARG*     4.6     7.9    -      -       -      -
    327N  HIS*     3.1    26.0    +      +       +      +
    328N  VAL*     3.6     9.0    -      -       +      +
    330N  ARG*     1.3    76.7    -      -       +      +
    332N  PHE*     1.3    70.6    +      -       -      +
    334N  ARG*     3.4    15.7    +      -       +      +
    335N  ILE*     3.3    45.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 332 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    269N  THR*     4.4    14.6    -      -       +      -
    273N  MET*     3.1    31.4    -      -       +      -
    285N  PHE      4.9     1.6    -      -       -      -
    286N  LEU*     5.3     6.1    -      -       +      -
    289N  PHE*     3.1    55.4    -      +       +      -
    290N  HIS*     5.6     2.0    -      +       -      -
    293N  ILE*     3.7    21.8    -      -       +      -
    328N  VAL*     2.8    24.2    +      -       +      +
    329N  GLN      3.5     2.2    -      -       -      +
    331N  PHE*     1.3    77.7    -      -       -      +
    333N  TYR*     1.3    97.8    +      +       -      +
    335N  ILE*     3.0    11.6    +      -       -      +
    336N  TYR*     3.0    34.2    +      +       +      -
----------------------------------------------------------
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Residues in contact with TYR 333 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286N  LEU*     5.0     4.5    -      -       +      -
    290N  HIS*     3.1    23.4    +      +       -      -
    293N  ILE*     6.0     0.2    -      -       +      -
    329N  GLN*     2.9    41.9    +      -       +      +
    330N  ARG*     3.8     8.1    -      -       -      +
    332N  PHE*     1.3   101.1    -      +       -      +
    334N  ARG*     1.3    67.3    +      -       -      +
    336N  TYR*     3.2     1.6    +      +       -      +
    337N  ALA*     2.9    23.0    +      -       -      +
    363N  TYR*     3.6    14.5    -      +       -      -
    364N  CYS*     3.1    31.3    -      -       -      -
    367N  ARG*     2.8    68.5    +      -       +      +
    368N  THR      4.9     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 334 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330N  ARG*     3.0    62.7    +      -       -      +
    331N  PHE*     3.8    10.5    -      -       +      +
    332N  PHE      3.3     0.2    -      -       -      -
    333N  TYR*     1.3    76.6    -      -       -      +
    335N  ILE*     1.3    64.2    +      -       +      +
    337N  ALA*     3.5     5.6    +      -       -      +
    338N  SER*     3.1    24.3    +      -       -      -
    367N  ARG      5.0     1.8    +      -       -      -
    368N  THR*     4.0    33.4    +      -       -      +
    369N  ASP*     4.9    11.8    +      -       -      +
    370N  GLN*     3.9     9.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 335 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    266N  HIS      4.6     4.3    -      -       -      +
    269N  THR*     4.8     4.7    -      -       +      -
    270N  ARG*     3.7    50.9    -      -       +      +
    273N  MET*     3.3    21.1    -      -       +      -
    331N  PHE*     3.3    51.1    -      -       +      +
    332N  PHE*     3.0     7.5    +      -       -      +
    334N  ARG*     1.3    76.8    -      -       +      +
    336N  TYR*     1.3    63.4    +      -       -      +
    338N  SER*     2.6    24.2    +      -       -      +
    339N  LEU*     3.1    16.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 336 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273N  MET*     3.4    24.2    -      -       +      +
    277N  CYS*     4.1    14.1    -      -       -      -
    281N  TYR*     3.8     0.7    +      -       -      -
    284N  SER*     2.9    20.8    +      -       -      -
    285N  PHE*     4.5    12.6    -      -       +      -
    286N  LEU*     4.1    14.6    -      -       +      -
    289N  PHE*     5.7     0.9    -      +       -      -
    332N  PHE*     3.0    24.1    +      +       +      +
    333N  TYR*     3.2     5.8    +      +       -      +
    335N  ILE*     1.3    75.1    -      -       -      +
    337N  ALA*     1.3    64.6    +      -       -      +
    339N  LEU*     3.3     2.2    +      -       +      -
    340N  ARG*     2.7    74.1    +      -       +      +
    360N  ASP*     3.6    30.7    -      -       +      +
    364N  CYS*     4.1    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 337 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333N  TYR      2.9    16.6    +      -       -      +
    334N  ARG*     3.7     2.5    -      -       -      +
    336N  TYR*     1.3    76.2    -      -       -      +
    338N  SER*     1.3    64.2    +      -       -      +
    340N  ARG*     3.2     3.9    +      -       -      +
    341N  ILE*     2.9    25.9    +      -       +      +
    361N  LEU*     4.4     8.5    -      -       -      -
    364N  CYS*     3.8    15.0    -      -       -      +
    365N  LEU*     4.4    18.8    -      -       +      -
    368N  THR      5.5     3.6    -      -       -      +
    370N  GLN*     3.2    21.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 338 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334N  ARG      3.1    14.1    +      -       -      -
    335N  ILE*     2.6    28.4    +      -       -      +
    337N  ALA*     1.3    74.3    -      -       -      +
    339N  LEU*     1.3    62.6    +      -       -      +
    341N  ILE*     3.0    19.6    +      -       -      +
    342N  GLU*     3.1    23.9    +      -       -      +
    370N  GLN*     3.5    18.5    +      -       -      +
    373N  GLN*     5.7     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 339 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270N  ARG*     5.9     3.8    -      -       +      +
    273N  MET*     3.8    32.3    -      -       +      -
    274N  GLU*     4.1    26.9    -      -       +      +
    277N  CYS*     3.8    22.4    -      -       +      -
    278N  ARG*     4.8    11.8    +      -       -      +
    335N  ILE*     3.1    19.8    +      -       +      +
    336N  TYR*     3.9     4.3    -      -       +      +
    338N  SER*     1.3    78.5    +      -       -      +
    340N  ARG*     1.3    71.5    +      -       -      +
    342N  GLU*     3.4    11.9    +      -       +      +
    343N  GLU*     3.3    26.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 340 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277N  CYS*     3.3    33.7    +      -       -      +
    280N  GLU*     4.3     6.3    -      -       -      +
    281N  TYR*     5.2     1.9    -      -       -      -
    284N  SER*     4.3     3.0    +      -       -      -
    285N  PHE*     4.1     6.3    -      -       -      -
    336N  TYR*     2.7    67.6    +      -       +      +
    339N  LEU*     1.3    79.6    +      -       -      +
    341N  ILE*     1.3    53.1    +      -       -      +
    343N  GLU*     2.5    31.1    +      -       -      +
    344N  LEU*     2.7    34.5    +      -       -      +
    347N  ILE*     3.4    19.9    -      -       +      +
    357N  ALA*     3.7    23.3    +      -       -      +
    361N  LEU*     3.4    34.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 341 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337N  ALA*     2.9    18.6    +      -       +      +
    338N  SER*     3.0     9.6    +      -       -      +
    340N  ARG*     1.3    75.4    -      -       -      +
    342N  GLU*     1.3    67.5    +      -       -      +
    344N  LEU*     2.7    27.9    -      -       +      +
    345N  PHE      3.8     1.4    +      -       -      -
    361N  LEU*     3.9    12.3    -      -       +      -
    365N  LEU*     5.0     1.6    -      -       +      -
    370N  GLN*     3.3    36.1    -      -       +      +
    373N  GLN*     5.0     3.8    -      -       -      +
    374N  LEU*     3.7    43.3    -      -       +      -
    377N  SER*     3.4    34.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 342 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278N  ARG*     5.9     3.8    -      -       -      +
    338N  SER*     3.1    22.7    +      -       -      +
    339N  LEU*     3.9    13.2    -      -       +      +
    340N  ARG      3.3     0.4    -      -       -      -
    341N  ILE*     1.3    88.0    -      -       -      +
    343N  GLU*     1.3    63.8    +      -       +      +
    344N  LEU      3.0     1.2    +      -       -      -
    345N  PHE*     3.4    12.8    +      -       -      +
    346N  SER*     3.8     5.7    +      -       -      -
    373N  GLN*     5.2     3.3    -      -       -      +
    377N  SER*     3.6    16.5    +      -       -      -
    385N  ARG*     4.7     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 343 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277N  CYS*     5.2     0.7    -      -       -      +
    278N  ARG*     2.8    53.5    +      -       -      +
    280N  GLU*     2.7    38.8    -      -       -      +
    339N  LEU*     3.3    12.1    +      -       -      +
    340N  ARG*     2.5    30.0    +      -       -      -
    342N  GLU*     1.3    79.4    -      -       +      +
    344N  LEU*     1.3    49.6    -      -       -      +
    345N  PHE      3.5     0.2    -      -       -      -
    346N  SER*     2.7    11.3    -      -       -      -
    347N  ILE*     2.0    50.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 344 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340N  ARG      2.7    17.5    +      -       -      +
    341N  ILE*     2.7    19.7    -      -       +      +
    342N  GLU      3.0     1.0    -      -       -      -
    343N  GLU*     1.3    68.4    -      -       -      +
    345N  PHE*     1.3    65.8    +      -       -      +
    347N  ILE*     3.6     6.5    -      -       +      -
    348N  VAL*     2.8    39.8    +      -       +      +
    358N  ILE*     4.6     9.9    -      -       +      -
    361N  LEU*     4.0    24.5    -      -       +      -
    374N  LEU*     3.3    30.1    -      -       +      -
    378N  LEU*     3.6    31.4    -      -       +      -
    407N  LEU*     4.4    18.4    -      -       +      -
    410N  ILE*     5.0     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 345 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341N  ILE      3.8     1.6    +      -       -      -
    342N  GLU      3.4     6.7    +      -       -      +
    344N  LEU*     1.3    84.1    -      -       -      +
    346N  SER*     1.3    56.2    +      -       -      +
    348N  VAL*     3.4     5.0    +      -       -      +
    349N  ARG*     3.2    23.4    +      -       +      -
    378N  LEU*     5.9     3.4    -      -       +      -
    381N  ALA*     4.1    24.5    -      -       +      -
    382N  LEU*     3.4    35.0    -      -       +      -
    385N  ARG*     2.9    66.9    -      -       +      +
    386N  LEU*     3.8    22.4    -      -       +      -
    399N  LEU*     3.6    24.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 346 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280N  GLU*     3.8    11.8    +      -       -      +
    342N  GLU      3.8     1.9    +      -       -      -
    343N  GLU*     2.7    20.5    +      -       -      -
    345N  PHE*     1.3    83.4    -      -       -      +
    347N  ILE*     1.3    61.7    +      -       -      +
    349N  ARG*     3.3    20.6    +      -       -      +
    350N  ASP*     3.7     9.7    -      -       -      +
    385N  ARG*     3.8    16.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 347 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280N  GLU*     3.4    21.8    -      -       +      +
    340N  ARG*     3.4    48.9    -      -       +      +
    343N  GLU*     2.0    34.6    +      -       +      +
    344N  LEU*     3.1     8.5    +      -       +      +
    346N  SER*     1.3    68.0    -      -       -      +
    348N  VAL*     1.3    65.1    +      -       +      +
    350N  ASP*     3.5    12.4    +      -       -      +
    351N  PHE*     3.7     2.7    -      -       +      +
    354N  SER*     2.7    38.6    +      -       -      +
    357N  ALA*     4.0    10.8    -      -       +      -
    358N  ILE*     3.3    33.7    -      -       +      -
    361N  LEU*     5.9     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 348 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344N  LEU*     2.8    32.4    +      -       +      +
    345N  PHE*     3.8     5.4    -      -       -      +
    347N  ILE*     1.3    82.3    -      -       +      +
    349N  ARG*     1.3    49.7    +      -       -      +
    350N  ASP      2.6    27.2    -      -       -      +
    351N  PHE*     3.4     5.1    +      -       -      +
    358N  ILE*     5.2     0.4    -      -       +      -
    399N  LEU*     4.2    16.9    -      -       +      +
    402N  SER*     3.6     9.2    -      -       -      +
    403N  ALA*     3.4    40.4    -      -       +      +
    406N  ALA*     3.7    21.8    -      -       +      -
    407N  LEU*     5.1     7.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 349 (chain N). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345N  PHE*     3.2    19.2    +      -       +      +
    346N  SER*     3.3    18.3    +      -       -      +
    348N  VAL*     1.3    70.0    -      -       -      +
    350N  ASP*     1.3    65.9    +      -       -      +
    385N  ARG*     5.2     3.1    -      -       -      +
    399N  LEU*     4.6    14.3    -      -       +      +
----------------------------------------------------------
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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