Contacts of the helix formed by residues 390 - 413 (chain B) in PDB entry 3IFS


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 ASN 390 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  MSE      5.6     0.2    -      -       -      +
     96B  LEU*     3.6    14.2    -      -       -      +
    388B  GLU*     3.5    32.6    +      -       +      +
    389B  LEU*     1.3    76.2    -      -       -      +
    391B  GLU*     1.3    73.1    +      -       -      +
    392B  TYR*     3.5    10.0    +      -       -      +
    393B  THR*     2.7    33.4    +      -       -      -
    394B  PHE*     3.0    18.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 391 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96B  LEU*     4.0    16.7    -      -       +      +
    224B  GLY      4.8     0.7    -      -       -      +
    225B  LEU*     3.5    27.6    -      -       +      +
    226B  ASN*     2.8    55.7    +      -       -      +
    229B  GLU*     4.1     5.3    -      -       +      +
    230B  MSE      3.4    23.5    -      -       +      +
    390B  ASN*     1.3    81.8    -      -       -      +
    392B  TYR*     1.3    64.2    +      -       -      +
    394B  PHE*     3.3     3.1    +      -       -      +
    395B  GLY      3.1    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 392 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3B  THR      5.1    10.2    +      -       -      -
      4B  HIS*     5.9     4.6    -      -       +      +
    229B  GLU*     3.4    38.2    +      -       +      +
    232B  LYS*     3.9    12.6    -      -       +      -
    233B  GLY*     3.2    39.8    -      -       -      -
    236B  ALA*     3.2    20.8    -      -       +      +
    390B  ASN*     3.3    10.8    +      -       -      +
    391B  GLU*     1.3    79.2    -      -       -      +
    393B  THR*     1.3    70.5    +      -       -      +
    396B  TYR*     3.1    30.7    +      +       +      +
----------------------------------------------------------
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Residues in contact with THR 393 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  HIS*     6.5     0.2    -      -       -      -
      5B  VAL*     4.0    16.2    -      -       +      -
    386B  ILE*     3.5    23.3    -      -       +      -
    387B  PRO*     4.5     9.8    -      -       +      +
    388B  GLU*     3.3    28.3    +      -       -      +
    389B  LEU*     5.1     0.9    -      -       +      -
    390B  ASN*     2.7    27.3    +      -       -      -
    392B  TYR*     1.3    81.9    -      -       -      +
    394B  PHE*     1.3    60.5    +      -       -      +
    396B  TYR*     3.3     4.3    +      -       -      +
    397B  LEU*     2.8    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 394 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  GLY*     4.0    10.5    -      -       -      -
     91B  ALA*     4.3     3.6    -      -       +      -
     92B  ALA*     3.5    37.9    -      -       +      -
     95B  MSE      3.7    28.0    -      -       +      -
     96B  LEU*     4.0    13.9    -      -       +      -
    211B  VAL*     4.3    14.1    -      -       +      -
    212B  LEU*     5.1     1.6    -      -       +      -
    230B  MSE      3.7    27.6    -      -       +      -
    281B  PHE*     4.0    22.2    -      +       -      -
    284B  TRP*     6.2     1.8    -      +       -      -
    390B  ASN      3.0    14.4    +      -       -      +
    391B  GLU      3.3     7.2    +      -       -      +
    393B  THR*     1.3    75.8    -      -       -      +
    395B  GLY*     1.3    58.5    +      -       -      +
    397B  LEU*     3.6     5.5    -      -       -      +
    398B  VAL*     2.9    55.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 395 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212B  LEU*     5.1     2.9    -      -       -      -
    230B  MSE      3.5    30.1    -      -       -      -
    234B  ALA*     3.4    21.7    -      -       -      +
    391B  GLU      3.1    10.5    +      -       -      -
    392B  TYR      3.8     0.7    -      -       -      -
    394B  PHE*     1.3    79.1    -      -       -      +
    396B  TYR*     1.3    61.2    +      -       -      +
    398B  VAL*     3.5     5.4    +      -       -      +
    399B  TYR      3.1    17.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 396 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  HIS*     4.3    16.5    -      -       +      +
      5B  VAL*     3.6    44.3    +      -       +      -
    233B  GLY      3.2    27.0    -      -       -      +
    234B  ALA*     4.3     1.1    -      -       -      +
    236B  ALA*     3.5    12.6    -      -       +      -
    237B  GLY      3.4    16.2    -      -       -      -
    240B  ASP*     2.3    40.1    +      -       -      +
    241B  PHE*     3.5    27.0    -      +       -      -
    392B  TYR*     3.1    26.2    +      +       +      +
    393B  THR*     3.6     7.9    -      -       -      +
    395B  GLY*     1.3    75.7    -      -       -      +
    397B  LEU*     1.3    57.0    +      -       -      +
    399B  TYR*     3.3     5.7    +      -       -      +
    400B  PHE*     3.0    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 397 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  VAL*     4.1    18.8    -      -       +      +
     95B  MSE      4.6    15.5    -      -       +      -
    281B  PHE*     3.7    32.3    -      -       +      -
    330B  LEU*     4.9     0.9    -      -       +      -
    384B  VAL*     3.9    22.4    -      -       +      -
    386B  ILE*     3.7    28.9    -      -       +      -
    393B  THR*     2.8    18.2    +      -       +      +
    394B  PHE*     3.6     5.2    -      -       -      +
    396B  TYR*     1.3    75.3    -      -       -      +
    398B  VAL*     1.3    66.0    +      -       -      +
    400B  PHE*     3.3     6.7    +      -       +      +
    401B  PHE*     3.1    50.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 398 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211B  VAL*     3.6    18.4    -      -       +      -
    212B  LEU*     4.1    12.8    -      -       +      -
    281B  PHE*     4.2    10.1    -      -       +      -
    284B  TRP*     3.8    17.6    -      -       +      -
    394B  PHE*     2.9    55.1    +      -       +      +
    395B  GLY*     3.7     5.8    -      -       -      +
    397B  LEU*     1.3    75.3    -      -       -      +
    399B  TYR*     1.3    58.9    +      -       -      +
    401B  PHE      3.3     0.7    +      -       -      -
    402B  GLU*     2.9    58.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 399 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  TRP*     3.7    21.3    -      +       -      -
     49B  VAL*     2.6    45.0    +      -       -      +
     52B  PRO*     3.9    21.5    -      -       +      -
    212B  LEU*     5.4     2.0    -      -       +      -
    234B  ALA*     3.8    14.6    -      -       +      +
    237B  GLY*     3.5    20.0    -      -       -      -
    238B  ARG*     3.4    24.1    +      -       +      +
    241B  PHE*     4.0     5.2    -      +       +      -
    395B  GLY      3.1    17.4    +      -       -      +
    396B  TYR      3.3     4.2    +      -       -      +
    397B  LEU      3.2     0.2    -      -       -      -
    398B  VAL*     1.3    75.8    -      -       +      +
    400B  PHE*     1.3    64.8    +      -       -      +
    402B  GLU*     3.8    14.3    -      -       -      -
    403B  LYS*     2.9    48.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 400 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  VAL*     4.9    10.3    -      -       +      -
      6B  THR      5.7     0.2    -      -       -      -
      7B  PHE*     4.2    13.5    -      -       +      -
    241B  PHE*     3.6    34.9    -      +       +      -
    250B  PRO*     3.7    12.3    -      -       +      -
    251B  ALA*     3.6    31.1    -      -       -      +
    254B  TYR*     4.0    25.6    -      +       +      -
    384B  VAL*     4.0    17.5    -      -       +      -
    396B  TYR      3.0    14.5    +      -       -      +
    397B  LEU*     3.4    15.3    -      -       +      +
    399B  TYR*     1.3    75.3    -      -       -      +
    401B  PHE*     1.3    98.1    +      +       -      +
    403B  LYS      3.5     0.2    +      -       -      -
    404B  ALA*     2.9    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 401 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254B  TYR*     3.6    34.8    -      +       -      -
    271B  LEU*     4.5     5.2    -      -       +      -
    281B  PHE*     3.8    27.1    -      +       -      -
    284B  TRP*     4.0     5.6    -      +       +      -
    285B  TRP*     3.7    27.6    -      +       -      -
    288B  LEU*     3.6    16.1    -      -       +      +
    289B  PHE*     3.8     5.0    -      +       +      -
    330B  LEU*     4.0    19.7    -      -       +      -
    384B  VAL*     4.2     7.6    -      -       +      -
    397B  LEU*     3.1    42.7    +      -       +      +
    398B  VAL      4.0     2.2    -      -       -      +
    400B  PHE*     1.3    94.3    -      +       -      +
    402B  GLU*     1.3    60.0    +      -       -      +
    404B  ALA*     4.3     1.3    -      -       -      -
    405B  CYS*     2.8    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 402 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  TRP*     3.7    27.3    -      -       +      +
    209B  PHE*     3.7    53.2    -      -       +      +
    211B  VAL*     4.2     4.7    -      -       -      +
    212B  LEU*     5.0     6.0    -      -       -      +
    284B  TRP*     4.1    16.7    -      -       +      -
    288B  LEU*     4.0     7.4    -      -       +      -
    398B  VAL*     2.9    40.2    +      -       -      +
    399B  TYR*     3.8    14.7    -      -       -      +
    401B  PHE*     1.3    76.8    -      -       -      +
    403B  LYS*     1.3    58.4    +      -       -      +
    405B  CYS*     3.2     2.8    +      -       -      +
    406B  ALA*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 403 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35B  ILE*     4.3    15.0    -      -       +      -
     36B  HIS*     2.8    35.9    +      -       -      -
     48B  TRP*     4.0    19.2    -      -       +      -
     49B  VAL*     4.5     2.7    -      -       -      -
    238B  ARG*     5.6     0.2    -      -       -      +
    241B  PHE*     2.9    36.4    +      -       +      +
    242B  GLY*     4.2     0.4    -      -       -      -
    251B  ALA*     4.2     6.5    -      -       +      -
    252B  TYR*     2.8    32.9    +      -       +      +
    399B  TYR*     2.9    42.7    +      -       +      +
    400B  PHE      4.0     1.6    -      -       -      +
    402B  GLU*     1.3    76.6    -      -       -      +
    404B  ALA*     1.3    63.2    +      -       -      +
    406B  ALA*     3.4     3.3    +      -       -      +
    407B  MSE      3.2    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 404 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251B  ALA*     3.2    32.0    -      -       -      +
    254B  TYR*     3.6    27.6    -      -       +      -
    255B  ALA*     3.4     6.2    -      -       +      +
    289B  PHE*     4.4     1.1    -      -       -      -
    400B  PHE*     2.9    20.0    +      -       +      +
    401B  PHE*     3.8     5.2    -      -       -      +
    403B  LYS*     1.3    76.1    -      -       -      +
    405B  CYS*     1.3    57.3    +      -       -      +
    407B  MSE      3.3     1.5    +      -       -      -
    408B  SER*     2.8    32.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 405 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209B  PHE*     4.4     3.8    -      -       +      -
    288B  LEU*     3.4    28.9    -      -       +      -
    289B  PHE*     3.6    27.3    -      -       +      -
    292B  SER*     3.2    37.4    -      -       -      -
    293B  GLU*     5.2     1.8    -      -       -      -
    401B  PHE      2.8    17.8    +      -       -      +
    402B  GLU      3.5     4.9    -      -       -      +
    404B  ALA*     1.3    73.8    -      -       -      +
    406B  ALA*     1.3    65.5    +      -       -      +
    408B  SER*     3.7     1.0    -      -       -      -
    409B  GLY*     2.9    21.8    +      -       -      -
    416B  PRO*     4.7     2.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 406 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35B  ILE*     4.1    16.6    -      -       +      -
     48B  TRP*     3.8    20.0    -      -       +      -
    209B  PHE*     5.1     0.6    -      -       -      -
    402B  GLU      3.0    12.8    +      -       -      +
    403B  LYS*     3.6     9.0    -      -       +      +
    404B  ALA      3.4     0.2    -      -       -      -
    405B  CYS*     1.3    76.1    -      -       -      +
    407B  MSE      1.3    63.5    +      -       -      +
    409B  GLY      3.5     0.2    +      -       -      -
    410B  TYR*     3.2    30.6    +      -       -      -
    416B  PRO*     3.9     6.1    -      -       -      +
    417B  PHE*     3.9    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MSE 407 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28B  VAL*     3.6    31.2    -      -       +      +
     31B  THR*     3.7    24.5    -      -       +      -
     32B  HIS*     3.9    11.7    -      -       -      +
     35B  ILE*     4.2     5.8    -      -       +      +
    252B  TYR*     3.5    57.7    -      -       +      +
    255B  ALA*     3.5    17.5    -      -       +      -
    403B  LYS      3.2     5.3    +      -       -      +
    404B  ALA      3.6     7.2    -      -       -      +
    406B  ALA*     1.3    79.2    -      -       -      +
    408B  SER*     1.3    58.7    +      -       -      +
    410B  TYR*     3.3     1.7    +      -       -      +
    411B  LEU*     2.9    53.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 408 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255B  ALA*     3.8    14.4    -      -       -      -
    258B  ARG*     2.8    22.1    +      -       -      -
    259B  ASN*     3.3    26.8    +      -       -      +
    289B  PHE*     4.4     2.7    -      -       -      -
    293B  GLU*     2.4    24.4    +      -       -      +
    404B  ALA      2.8    21.4    +      -       -      -
    405B  CYS*     3.3     7.8    +      -       -      -
    407B  MSE      1.3    71.3    -      -       -      +
    409B  GLY*     1.3    55.9    +      -       -      +
    411B  LEU      3.2     1.4    +      -       -      -
    412B  LEU*     2.9    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 409 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292B  SER*     5.9     0.2    -      -       -      -
    293B  GLU*     3.2    14.3    +      -       -      -
    405B  CYS      2.9    15.2    +      -       -      -
    406B  ALA      4.0     1.1    -      -       -      -
    408B  SER*     1.3    72.9    -      -       -      +
    410B  TYR*     1.3    66.0    +      -       -      +
    412B  LEU*     3.2     2.7    +      -       -      +
    413B  GLY      3.1    16.6    +      -       -      -
    414B  VAL*     3.1    30.4    +      -       -      +
    416B  PRO*     4.0    10.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 410 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31B  THR*     3.3    35.9    -      -       +      +
     34B  ALA*     5.2     7.0    +      -       +      -
     35B  ILE*     3.8    24.9    -      -       +      -
     40B  GLY*     3.7    11.6    +      -       -      -
     41B  ALA*     2.5    48.3    +      -       +      -
     42B  GLY      4.8     1.2    -      -       -      -
     43B  ASN      4.8     0.2    +      -       -      -
     46B  LEU*     4.8     6.6    -      -       +      +
    406B  ALA      3.2    23.4    +      -       -      +
    407B  MSE      3.8     0.7    -      -       -      +
    409B  GLY*     1.3    76.0    -      -       -      +
    411B  LEU*     1.3    63.0    +      -       -      +
    413B  GLY*     3.0    14.2    +      -       -      -
    414B  VAL      4.0     6.1    -      -       -      -
    416B  PRO*     3.7    13.0    -      -       +      +
    417B  PHE*     3.5    24.9    -      +       -      -
     23C  TYR*     6.5     1.8    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 411 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  LEU*     4.6    12.1    -      -       +      -
     27B  ALA*     4.0    28.7    -      -       +      -
     28B  VAL*     4.5     1.6    -      -       +      +
     31B  THR*     4.3     8.7    -      -       -      +
    255B  ALA      4.4     0.2    -      -       -      -
    256B  VAL*     3.9    34.3    -      -       +      +
    259B  ASN*     3.8    18.8    -      -       +      +
    407B  MSE      2.9    51.0    +      -       +      +
    408B  SER      3.2     4.7    +      -       -      +
    410B  TYR*     1.3    77.2    -      -       -      +
    412B  LEU*     1.3    59.9    +      -       -      +
    413B  GLY*     3.3     0.7    +      -       -      -
    263C  ASN*     5.5     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 412 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259B  ASN*     3.7    15.9    +      -       -      +
    262B  TYR*     3.8    30.1    -      -       +      -
    293B  GLU*     3.7    43.5    -      -       +      +
    298B  LYS*     4.2    14.3    +      -       +      +
    299B  GLY*     3.9    14.8    -      -       -      +
    300B  ILE      5.3     0.4    -      -       -      +
    408B  SER      2.9    13.2    +      -       -      +
    409B  GLY*     3.2     9.8    +      -       -      +
    411B  LEU*     1.3    76.1    -      -       -      +
    413B  GLY*     1.3    59.3    +      -       -      +
    414B  VAL*     4.0    14.8    -      -       +      +
    263C  ASN*     3.7    29.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 413 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296B  ASP*     4.8     2.4    -      -       -      +
    298B  LYS*     4.3    10.8    +      -       -      -
    410B  TYR      3.0    15.1    +      -       -      -
    411B  LEU      3.1     1.5    -      -       -      -
    412B  LEU*     1.3    79.8    -      -       -      +
    414B  VAL*     1.3    63.3    +      -       -      +
     20C  GLU*     4.8     6.2    -      -       -      +
     23C  TYR*     3.6    20.9    -      -       -      +
     24C  LEU*     4.3    22.3    -      -       -      +
----------------------------------------------------------
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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