Contacts of the helix formed by residues 326 - 350 (chain B) in PDB entry 1EGE


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 326 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253B  ASP*     3.4    25.6    +      -       -      +
    256B  ARG*     6.3     1.3    -      -       -      +
    324B  ARG*     3.3    44.2    +      -       -      +
    325B  ASN*     1.3    81.4    -      -       -      +
    327B  TYR*     1.3    61.1    +      -       -      -
    329B  ALA*     4.0     1.5    -      -       -      +
    330B  SER*     3.1    33.3    +      -       -      +
    385B  ILE*     3.9    22.0    -      -       +      -
    388B  ARG*     4.8     4.0    -      -       -      +
    389B  GLU*     4.2     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324B  ARG      4.8     3.7    +      -       -      +
    325B  ASN      2.9     5.8    +      -       -      +
    326B  THR*     1.3    76.7    -      -       -      +
    328B  TYR*     1.3    83.1    +      +       +      +
    330B  SER*     3.8     1.5    +      -       -      -
    331B  ILE*     3.2    39.7    +      -       +      +
    386B  VAL*     3.7    26.7    -      -       +      +
    389B  GLU*     4.0    27.1    +      -       +      +
    390B  HIS*     4.6    12.2    +      -       +      -
    393B  LYS*     3.0    37.8    -      -       -      +
    271C  LEU*     5.8     0.5    -      -       -      +
    302C  ALA*     3.9    16.7    +      -       +      +
    306C  GLU*     3.3    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311B  SER*     4.2     3.9    +      -       -      +
    314B  ARG*     4.2    32.3    +      -       +      -
    315B  ALA*     3.8    18.9    -      -       +      +
    318B  GLU*     3.4    38.8    -      -       +      -
    324B  ARG      4.8     4.9    -      -       -      -
    325B  ASN      2.8    15.6    +      -       -      +
    327B  TYR*     1.3    91.5    -      +       +      +
    329B  ALA*     1.3    58.0    +      -       -      +
    331B  ILE*     3.3    16.2    +      -       +      +
    332B  ALA*     2.9    26.5    +      -       -      +
    306C  GLU*     3.5    31.5    +      -       +      -
    310C  MET*     5.0     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256B  ARG*     4.0    24.7    -      -       +      +
    257B  PRO*     4.0     4.7    -      -       +      -
    315B  ALA*     3.6    14.8    -      -       +      +
    325B  ASN*     2.8    37.5    +      -       -      +
    326B  THR*     3.5     4.0    +      -       -      +
    328B  TYR*     1.3    75.5    -      -       -      +
    330B  SER*     1.3    60.6    +      -       -      +
    332B  ALA*     3.1     5.0    -      -       -      +
    333B  LYS*     2.8    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256B  ARG*     3.9    11.2    +      -       -      +
    326B  THR*     3.1    20.4    +      -       -      +
    329B  ALA*     1.3    72.9    -      -       -      +
    331B  ILE*     1.3    56.9    +      -       -      +
    333B  LYS      3.7     0.2    -      -       -      -
    334B  ALA*     2.7    36.7    +      -       -      +
    382B  GLN*     2.9    32.8    +      -       -      +
    385B  ILE*     3.4    18.2    -      -       -      +
    386B  VAL*     3.6    21.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311B  SER*     3.6    13.2    -      -       -      +
    327B  TYR*     3.2    40.3    +      -       +      +
    328B  TYR*     3.3    15.9    +      -       +      +
    330B  SER*     1.3    76.7    -      -       -      +
    332B  ALA*     1.3    68.1    +      -       -      +
    334B  ALA*     3.6     1.6    -      -       -      +
    335B  PHE*     2.9    20.7    +      -       +      +
    386B  VAL*     4.0    10.1    -      -       +      -
    303C  MET*     3.7    43.1    -      -       +      +
    306C  GLU*     4.0    17.5    -      -       +      -
    307C  LEU*     3.8    21.1    -      -       +      -
    310C  MET*     6.2     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256B  ARG      5.4     0.9    -      -       -      +
    257B  PRO*     5.4     0.9    -      -       +      -
    260B  ALA*     3.8    20.4    -      -       +      -
    311B  SER*     3.1    19.9    +      -       -      +
    312B  TYR*     3.8    18.8    -      -       -      +
    315B  ALA*     4.6     0.9    -      -       +      -
    328B  TYR      2.9    14.6    +      -       -      +
    329B  ALA*     3.1    13.2    -      -       -      +
    330B  SER      3.1     0.2    -      -       -      -
    331B  ILE*     1.3    78.9    -      -       -      +
    333B  LYS*     1.3    57.5    +      -       -      +
    336B  ALA*     2.7    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256B  ARG*     4.3    16.4    -      -       +      +
    259B  VAL*     3.7    24.7    -      -       +      +
    260B  ALA*     3.8    10.0    -      -       -      +
    329B  ALA      2.8    18.2    +      -       -      +
    332B  ALA*     1.3    72.7    -      -       -      +
    334B  ALA*     1.3    61.0    +      -       -      +
    336B  ALA*     4.7     0.2    -      -       -      -
    337B  GLY*     3.1    17.3    +      -       -      +
    372B  TYR*     3.5    24.0    -      -       +      +
    373B  GLN*     5.1     0.7    -      -       -      +
    375B  TYR      3.0    21.7    +      -       -      -
    376B  GLU*     2.7    36.5    +      -       -      +
    377B  GLY      3.4    10.8    -      -       -      -
    379B  SER*     5.2     2.4    +      -       -      +
    382B  GLN*     3.3    29.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330B  SER      2.7    23.3    +      -       -      +
    331B  ILE      3.6     3.4    -      -       -      +
    333B  LYS*     1.3    74.2    -      -       -      +
    335B  PHE*     1.3    62.0    +      -       -      +
    338B  ASP*     3.0    34.8    +      -       -      +
    379B  SER*     4.7     3.3    +      -       -      -
    382B  GLN*     3.9    20.4    -      -       +      -
    383B  ARG*     4.1    15.0    -      -       +      +
    386B  VAL*     5.6     0.7    -      -       +      -
    303C  MET*     4.0    21.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304B  LYS*     3.5    20.9    -      -       +      -
    307B  LEU*     3.8    15.0    -      -       +      -
    308B  ALA*     3.5    42.2    -      -       +      -
    311B  SER*     4.8     3.1    -      -       -      +
    331B  ILE      2.9    17.8    +      -       -      +
    332B  ALA*     2.9     2.9    +      -       -      +
    334B  ALA*     1.3    75.3    -      -       -      +
    336B  ALA*     1.3    56.9    +      -       -      +
    338B  ASP*     2.9     6.4    +      -       +      +
    339B  ILE*     2.8    56.6    +      -       +      +
    303C  MET*     4.3    17.9    -      -       +      +
    307C  LEU*     3.7    33.0    -      -       +      -
    335C  PHE*     5.2     8.3    -      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 336 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260B  ALA*     3.5    36.1    -      -       +      +
    263B  ALA*     3.5     7.4    -      -       +      +
    264B  VAL*     4.1    12.6    -      -       +      -
    308B  ALA*     4.1     9.4    -      -       +      +
    332B  ALA      2.7    18.9    +      -       -      +
    335B  PHE*     1.3    74.7    -      -       -      +
    337B  GLY*     1.3    62.4    +      -       -      +
    339B  ILE*     3.5    10.0    -      -       -      +
    340B  ALA*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263B  ALA*     4.2     1.7    -      -       -      +
    333B  LYS*     3.1    17.9    +      -       -      +
    336B  ALA*     1.3    80.1    -      -       -      +
    338B  ASP*     1.3    63.1    +      -       -      +
    340B  ALA*     3.7     8.1    -      -       -      +
    341B  ASN*     3.6    17.8    -      -       -      +
    372B  TYR*     3.1    36.3    -      -       -      +
    373B  GLN*     3.6     4.5    -      -       -      +
    379B  SER*     5.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334B  ALA      3.0    15.7    +      -       -      +
    335B  PHE*     2.9     7.9    +      -       +      +
    337B  GLY*     1.3    75.1    -      -       -      +
    339B  ILE*     1.3    65.1    +      -       +      +
    340B  ALA      3.4     0.2    +      -       -      -
    341B  ASN*     3.4     7.3    +      -       -      +
    342B  GLN*     3.2    35.6    +      -       -      +
    373B  GLN*     3.9    16.2    +      -       -      +
    379B  SER*     3.0    26.9    +      -       -      -
    383B  ARG*     2.7    35.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264B  VAL*     5.2     2.2    -      -       +      -
    267B  ALA*     4.6    13.5    -      -       +      -
    304B  LYS*     3.0    62.8    -      -       +      +
    305B  VAL*     4.1     5.8    -      -       +      +
    308B  ALA*     3.3    17.7    -      -       +      -
    335B  PHE*     2.8    52.8    +      -       +      +
    336B  ALA*     3.5     9.2    -      -       -      +
    338B  ASP*     1.3    70.9    -      -       +      +
    340B  ALA*     1.3    57.6    +      -       -      +
    342B  GLN*     2.9    12.7    +      -       -      +
    343B  LEU*     2.7    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 340 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263B  ALA*     3.9    27.1    -      -       +      +
    266B  LEU*     4.0    13.8    -      -       +      +
    267B  ALA*     4.3    13.2    -      -       -      -
    336B  ALA      3.0    20.4    +      -       -      +
    337B  GLY*     3.7     5.2    -      -       -      +
    338B  ASP      3.3     0.2    -      -       -      -
    339B  ILE*     1.3    76.2    -      -       -      +
    341B  ASN*     1.3    59.3    +      -       -      +
    343B  LEU*     3.0     3.1    +      -       -      +
    344B  ALA*     2.8    30.3    +      -       -      +
    369B  ALA*     4.1     6.3    -      -       +      -
    372B  TYR*     4.9     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 341 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  THR*     4.6     6.1    +      -       -      -
    366A  MET*     4.9     6.1    -      -       -      +
    337B  GLY      3.6     2.2    +      -       -      +
    338B  ASP      3.4     3.5    +      -       -      +
    340B  ALA*     1.3    79.8    -      -       -      +
    342B  GLN*     1.3    62.3    +      -       +      +
    344B  ALA*     4.1     0.7    -      -       -      +
    345B  THR*     2.9    34.0    +      -       -      -
    366B  MET*     4.6     4.9    +      -       -      +
    369B  ALA*     3.1    31.7    -      -       -      +
    370B  LYS*     3.4    31.0    +      -       -      +
    373B  GLN*     3.3    40.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 342 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304B  LYS*     2.7    48.1    +      -       -      +
    338B  ASP*     3.2    30.0    +      -       -      +
    339B  ILE*     2.9    14.0    +      -       -      +
    341B  ASN*     1.3    79.8    -      -       +      +
    343B  LEU*     1.3    58.1    +      -       +      +
    345B  THR*     4.1     3.1    -      -       -      -
    346B  ASP*     3.2    33.1    +      -       -      +
    373B  GLN*     6.0     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 343 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267B  ALA*     3.1    33.9    -      -       +      +
    270B  ALA*     3.8     5.2    -      -       +      +
    271B  LEU*     4.1    11.7    -      -       +      -
    301B  MET*     3.6    44.1    -      -       +      +
    304B  LYS*     3.8    22.9    -      -       +      +
    305B  VAL*     3.2    24.5    -      -       +      -
    339B  ILE*     2.7    19.9    +      -       +      +
    340B  ALA      3.0     5.6    +      -       -      +
    342B  GLN*     1.3    73.8    -      -       -      +
    344B  ALA*     1.3    59.0    +      -       -      +
    345B  THR      3.1     1.8    -      -       -      -
    346B  ASP*     3.2     4.5    +      -       -      +
    347B  ALA*     2.8    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 344 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    266B  LEU*     4.1     5.4    -      -       +      +
    270B  ALA*     4.0    11.6    -      -       -      +
    340B  ALA      2.8    15.1    +      -       -      +
    341B  ASN      4.1     1.6    -      -       -      +
    343B  LEU*     1.3    76.4    -      -       -      +
    345B  THR*     1.3    59.6    +      -       -      +
    347B  ALA*     3.6     3.0    -      -       -      +
    348B  VAL*     3.2    28.4    +      -       -      +
    362B  VAL      4.2     2.1    -      -       -      +
    365B  LEU*     3.6    38.6    -      -       +      +
    366B  MET*     3.9     4.8    -      -       -      +
    369B  ALA*     3.9    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 345 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  ASN*     5.9     2.7    -      -       +      +
    366A  MET*     5.3     3.3    -      -       -      +
    370A  LYS*     3.3    28.5    +      -       +      +
    373A  GLN*     4.8     4.3    -      -       -      +
    341B  ASN*     2.9    25.0    +      -       -      -
    342B  GLN*     4.1     4.3    -      -       -      -
    343B  LEU      3.1     0.8    -      -       -      -
    344B  ALA*     1.3    75.7    -      -       -      +
    346B  ASP*     1.3    67.1    +      -       -      +
    348B  VAL*     3.1     4.3    +      -       -      +
    349B  GLN      3.1    16.8    +      -       -      -
    366B  MET*     3.8    27.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 346 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297B  MET*     4.4    22.9    -      -       -      +
    300B  GLU*     5.7     2.8    -      -       -      +
    301B  MET*     3.9    29.6    -      -       +      +
    304B  LYS*     5.8     1.4    +      -       -      -
    342B  GLN*     3.2    22.0    +      -       -      +
    343B  LEU*     3.7     3.5    -      -       -      +
    345B  THR*     1.3    79.5    -      -       -      +
    347B  ALA*     1.3    64.3    +      -       -      +
    349B  GLN*     3.1    10.5    +      -       -      +
    350B  ILE*     2.9    28.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 347 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270B  ALA*     3.8    30.7    -      -       +      +
    274B  ALA*     3.8    15.7    -      -       +      -
    301B  MET*     4.2     1.3    -      -       +      +
    343B  LEU      2.8    17.3    +      -       -      +
    344B  ALA*     3.6     7.2    -      -       -      +
    345B  THR      3.2     0.2    -      -       -      -
    346B  ASP*     1.3    76.2    -      -       -      +
    348B  VAL*     1.3    61.7    +      -       -      +
    350B  ILE*     3.1    10.4    +      -       -      +
    351B  LEU*     3.2    20.1    -      -       -      +
    362B  VAL*     4.0    17.5    -      -       +      -
    365B  LEU*     5.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 348 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  MET*     5.3     1.8    -      -       +      -
    370A  LYS*     4.0    23.3    -      -       +      -
    374A  ILE*     4.5     2.1    -      -       +      +
    344B  ALA      3.2    18.2    -      -       -      +
    345B  THR      3.1     5.7    +      -       -      +
    347B  ALA*     1.3    74.5    -      -       -      +
    349B  GLN*     1.3    65.0    +      -       -      +
    351B  LEU*     3.1    13.9    +      -       -      -
    352B  GLY      3.3     9.7    +      -       -      +
    355B  GLY*     3.2    27.1    -      -       -      +
    356B  PHE*     3.7    10.5    -      -       +      +
    362B  VAL*     3.6    31.9    -      -       -      +
    363B  GLU*     4.1     4.7    -      -       -      +
    366B  MET*     3.9    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 349 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370A  LYS*     3.5    14.5    +      -       -      +
    373A  GLN*     3.1    39.9    +      -       -      +
    374A  ILE*     3.1    32.7    -      -       -      +
    378A  THR*     4.4     8.3    -      -       -      +
    379A  SER*     3.7     5.1    +      -       -      +
    380A  GLN*     3.7    23.8    -      -       -      +
    399A  FAD      2.7    25.7    +      -       -      -
    297B  MET*     4.6     8.5    -      -       +      -
    345B  THR      3.1    11.1    +      -       -      +
    346B  ASP*     3.1    15.0    +      -       -      +
    348B  VAL*     1.3    79.5    -      -       -      +
    350B  ILE*     1.3    54.9    +      -       -      +
    352B  GLY*     3.1     8.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 350 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    399A  FAD      3.1    20.0    +      -       -      +
    274B  ALA*     3.7    33.9    -      -       +      +
    277B  TYR*     3.6    14.3    -      -       +      -
    278B  ALA*     4.6     8.5    -      -       +      -
    288B  LEU*     3.7     9.9    -      -       +      +
    294B  ILE*     4.0    22.2    -      -       +      -
    297B  MET*     3.6    39.7    -      -       +      -
    298B  LEU*     5.0     4.5    -      -       +      -
    301B  MET*     4.8     4.5    -      -       -      -
    346B  ASP      2.9    22.9    +      -       -      +
    347B  ALA      3.1     8.0    +      -       -      +
    349B  GLN*     1.3    74.8    -      -       -      +
    351B  LEU*     1.3    64.8    +      -       +      +
    352B  GLY      3.2     2.6    +      -       -      -
----------------------------------------------------------
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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