Contacts of the helix formed by residues 335 - 360 (chain I) in PDB entry 4XLN


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 335 (chain I).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21I  ILE*     4.0    27.6    -      -       +      +
     25I  SER*     2.9    28.7    +      -       -      +
     28I  LYS*     4.3     5.4    -      -       -      -
    138I  SER*     4.8     5.4    -      -       -      +
    332I  ARG*     5.8     0.3    +      -       -      -
    333I  ILE*     3.5    17.9    +      -       +      +
    334I  ARG*     1.3    75.0    -      -       -      +
    336I  VAL*     1.3    67.2    +      -       -      +
    338I  GLU*     3.1    29.6    +      -       -      +
    339I  LEU*     3.1    16.9    +      -       -      +
    461I  VAL*     4.3    11.0    -      -       +      -
    462I  ASP      5.3     3.4    -      -       -      +
    465I  GLY*     5.9     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 336 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21I  ILE      3.8    13.8    +      -       -      +
     22I  GLN*     3.2    54.9    -      -       -      +
     25I  SER*     4.4     1.3    -      -       -      -
     26I  TYR*     4.0    17.3    -      -       +      +
    121I  MET*     4.6     3.6    -      -       +      -
    127I  PHE*     5.3     0.4    -      -       +      -
    136I  ILE*     3.5    42.6    -      -       +      +
    137I  VAL      5.2     2.2    -      -       -      +
    138I  SER*     5.3     2.4    +      -       -      +
    335I  THR*     1.3    69.7    -      -       -      +
    337I  GLY*     1.3    62.2    +      -       -      +
    339I  LEU*     3.4    10.5    +      -       -      +
    340I  MET*     2.9    29.6    +      -       -      +
    385I  PHE*     5.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 337 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25I  SER      3.5    21.1    +      -       -      -
     26I  TYR*     4.1     7.0    -      -       -      -
     28I  LYS*     4.4     2.2    -      -       -      -
     29I  ALA*     3.5    23.6    -      -       -      +
    335I  THR*     3.3     0.8    +      -       -      -
    336I  VAL*     1.3    80.9    -      -       -      +
    338I  GLU*     1.3    59.1    +      -       -      +
    340I  MET*     3.2     7.6    -      -       -      +
    341I  ALA*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 338 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28I  LYS*     3.5    18.9    +      -       -      +
     42I  VAL*     5.6     4.5    -      -       -      +
     43I  GLY*     5.4     5.4    +      -       -      -
    165I  LEU*     6.3     2.9    -      -       +      -
    332I  ARG*     3.2    26.2    +      -       -      +
    334I  ARG*     3.6    27.2    +      -       -      +
    335I  THR*     3.1    28.5    +      -       -      +
    337I  GLY*     1.3    76.6    -      -       -      +
    339I  LEU*     1.3    56.4    +      -       -      +
    341I  ALA*     3.5     8.6    +      -       -      +
    342I  ASP*     2.9    27.4    +      -       -      +
    463I  ALA      3.8    11.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 339 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136I  ILE*     4.2    18.4    -      -       +      -
    137I  VAL      4.3     1.6    -      -       -      +
    139I  GLN*     4.1    11.7    -      -       -      +
    334I  ARG*     3.9    41.3    -      -       +      +
    335I  THR      3.1    18.6    +      -       -      +
    336I  VAL*     3.7     5.2    -      -       -      +
    338I  GLU*     1.3    72.6    -      -       -      +
    340I  MET*     1.3    67.2    +      -       -      +
    342I  ASP*     3.0    11.8    +      -       -      +
    343I  GLN*     2.9    27.5    +      -       -      +
    385I  PHE*     4.1    20.1    -      -       +      -
    391I  LEU*     3.6    29.2    -      -       +      -
    415I  PRO      6.0     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 340 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26I  TYR*     3.6    32.3    -      -       +      -
     29I  ALA*     4.3    11.4    -      -       +      +
     30I  LEU*     4.2     9.9    -      -       +      -
     44I  ILE*     5.3     3.4    -      -       +      -
    118I  LEU*     3.5    44.9    -      -       +      -
    127I  PHE*     5.3     0.7    -      -       +      -
    136I  ILE*     5.8     1.1    -      -       +      -
    336I  VAL      2.9    14.1    +      -       -      +
    337I  GLY*     3.2    13.5    -      -       -      +
    339I  LEU*     1.3    77.4    -      -       -      +
    341I  ALA*     1.3    57.9    +      -       -      +
    343I  GLN*     3.4     3.0    +      -       -      +
    344I  PHE*     2.9    39.1    +      -       +      +
    382I  LEU*     5.5     3.4    -      -       -      +
    385I  PHE*     4.9     7.6    -      -       +      -
    386I  PHE*     4.2    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 341 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29I  ALA*     5.1     1.3    -      -       +      +
     43I  GLY*     3.9    35.7    -      -       -      +
     44I  ILE*     4.5     2.5    -      -       -      +
     47I  ALA*     3.7     4.8    -      -       +      +
    337I  GLY      2.9    15.6    +      -       -      +
    338I  GLU*     3.8     8.3    -      -       -      +
    340I  MET*     1.3    77.8    -      -       -      +
    342I  ASP*     1.3    58.7    +      -       -      +
    344I  PHE*     3.6     8.0    -      -       -      +
    345I  ARG*     2.9    42.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 342 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166I  PRO*     5.1    11.5    -      -       -      +
    168I  ARG*     5.1     6.2    +      -       -      +
    334I  ARG*     4.0    22.8    +      -       -      +
    338I  GLU      2.9    15.3    +      -       -      +
    339I  LEU*     3.0    21.2    +      -       -      +
    341I  ALA*     1.3    77.9    -      -       -      +
    343I  GLN*     1.3    67.6    +      -       -      +
    345I  ARG*     3.1    28.5    -      -       -      +
    346I  VAL*     3.4    14.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 343 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339I  LEU      2.9    13.7    +      -       -      +
    340I  MET*     4.1     2.7    -      -       -      +
    342I  ASP*     1.3    87.3    +      -       -      +
    344I  PHE*     1.3    66.9    -      -       -      +
    345I  ARG      3.2     2.0    +      -       -      -
    346I  VAL*     3.3    11.8    +      -       -      +
    347I  GLY*     3.0    21.8    +      -       -      -
    381I  ALA*     4.3    19.4    -      -       -      +
    382I  LEU*     4.9     6.1    -      -       +      -
    384I  GLU*     6.1     0.9    -      -       -      +
    385I  PHE*     3.5    45.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 344 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44I  ILE*     3.5    31.9    -      -       +      -
     47I  ALA*     4.0    15.9    -      -       +      -
     48I  PHE*     4.0    10.3    -      +       -      -
     94I  LEU*     3.7    26.2    -      -       +      -
    118I  LEU*     4.5    10.1    -      -       +      -
    340I  MET*     2.9    24.7    +      -       +      +
    341I  ALA*     3.3    10.3    +      -       -      +
    343I  GLN*     1.3    76.4    -      -       -      +
    345I  ARG*     1.3    56.8    +      -       -      +
    348I  LEU*     2.9    53.4    +      -       +      +
    378I  LEU*     3.7    22.7    -      -       +      +
    382I  LEU*     4.1    33.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 345 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43I  GLY      5.3     0.2    +      -       -      -
     46I  ALA*     4.0    18.6    -      -       -      +
     47I  ALA*     3.6    23.1    -      -       +      +
     50I  GLU*     3.0    43.5    +      -       +      -
     51I  THR*     3.7     8.6    -      -       +      +
    165I  LEU*     6.0     2.9    -      -       -      +
    168I  ARG*     3.3    41.3    +      -       -      +
    268I  ASP*     3.9    20.7    +      -       -      -
    288I  ARG*     4.9     5.1    -      -       -      +
    341I  ALA*     2.9    22.7    +      -       -      +
    342I  ASP*     3.1    29.0    -      -       -      +
    344I  PHE*     1.3    76.5    -      -       -      +
    346I  VAL*     1.3    59.7    +      -       -      +
    348I  LEU      3.4     1.6    +      -       -      -
    349I  ALA*     2.9    27.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 346 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167I  LYS*     5.2    23.3    -      -       +      +
    168I  ARG*     3.7    21.3    -      -       -      +
    342I  ASP*     3.4    21.1    -      -       -      +
    343I  GLN*     3.3    14.9    +      -       -      +
    345I  ARG*     1.3    73.1    -      -       +      +
    347I  GLY*     1.3    61.0    +      -       -      +
    349I  ALA*     3.1     9.6    +      -       +      +
    350I  ARG*     2.9    50.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 347 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343I  GLN      3.0    12.6    +      -       -      -
    344I  PHE      3.9     1.1    -      -       -      -
    346I  VAL*     1.3    77.7    -      -       -      +
    348I  LEU*     1.3    56.1    +      -       -      +
    350I  ARG*     3.2     4.9    +      -       -      -
    351I  LEU*     2.9    20.4    +      -       -      +
    377I  PRO      2.9    30.2    -      -       -      +
    378I  LEU*     4.0     7.6    -      -       -      -
    381I  ALA*     3.6    19.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 348 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47I  ALA      3.3    11.2    -      -       -      +
     48I  PHE*     3.5    29.6    -      -       +      -
     51I  THR*     3.2    29.8    -      -       +      +
     52I  PHE*     5.4     6.3    -      -       +      -
    115I  LEU*     4.6     7.4    -      -       +      -
    344I  PHE*     2.9    28.9    +      -       +      +
    345I  ARG      3.6     4.9    -      -       -      +
    347I  GLY*     1.3    75.5    -      -       -      +
    349I  ALA*     1.3    58.1    +      -       -      +
    351I  LEU*     3.7    22.0    -      -       +      +
    352I  ALA*     2.9    24.6    +      -       -      +
    378I  LEU*     3.8    23.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 349 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51I  THR*     4.4     6.7    -      -       +      -
    168I  ARG*     5.8     2.9    -      -       -      +
    345I  ARG      2.9    13.0    +      -       -      +
    346I  VAL*     3.1    14.8    +      -       +      +
    348I  LEU*     1.3    75.6    -      -       -      +
    350I  ARG*     1.3    60.3    +      -       -      +
    351I  LEU      3.1     1.3    -      -       -      -
    352I  ALA*     2.9    23.3    +      -       +      +
    353I  ARG*     2.9    21.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 350 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167I  LYS*     6.1     0.6    -      -       -      +
    346I  VAL*     2.9    31.3    +      -       -      +
    347I  GLY*     3.4     9.7    -      -       -      +
    349I  ALA*     1.3    75.5    -      -       -      +
    351I  LEU*     1.3    57.4    +      -       -      +
    353I  ARG*     3.5    34.2    +      -       -      +
    354I  GLY*     2.9    21.1    +      -       -      -
    377I  PRO*     3.7    24.2    -      -       +      +
    381I  ALA*     6.2     1.5    -      -       -      +
     34R    A      5.7     1.8    +      -       -      -
     35R    G      4.5    14.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 351 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115I  LEU*     3.6    23.6    -      -       +      -
    347I  GLY      2.9    12.6    +      -       -      +
    348I  LEU*     3.8    20.2    -      -       +      +
    350I  ARG*     1.3    75.1    -      -       -      +
    352I  ALA*     1.3    59.9    +      -       -      +
    354I  GLY*     2.8    20.8    +      -       -      +
    355I  VAL*     2.9    24.6    +      -       +      +
    358I  ARG*     5.2     0.4    -      -       -      +
    373I  VAL*     4.6     8.1    -      -       +      -
    374I  ASN*     3.5    44.0    -      -       +      +
    377I  PRO*     3.4    26.8    -      -       +      +
    378I  LEU*     4.7     5.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 352 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51I  THR*     4.5     7.2    -      -       -      +
     54I  ILE*     3.6    25.4    -      -       +      +
    348I  LEU      2.9    16.8    +      -       -      +
    349I  ALA*     2.9    17.4    +      -       -      +
    351I  LEU*     1.3    77.2    -      -       -      +
    353I  ARG*     1.3    58.9    +      -       +      +
    355I  VAL*     3.4    19.0    +      -       -      +
    356I  ARG*     3.6    21.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 353 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349I  ALA      2.9    16.8    +      -       -      +
    350I  ARG*     3.7    39.3    -      -       -      +
    352I  ALA*     1.3    73.7    -      -       +      +
    354I  GLY*     1.3    62.8    +      -       -      +
    355I  VAL      3.1     2.1    +      -       -      -
    356I  ARG*     3.5    30.4    +      -       +      +
    357I  GLU*     3.8    17.5    +      -       -      +
     33R    G      5.8     1.4    +      -       -      -
     34R    A      2.4    36.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 354 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350I  ARG      2.9    13.2    +      -       -      -
    351I  LEU*     2.8    17.9    +      -       -      -
    353I  ARG*     1.3    77.5    -      -       -      +
    355I  VAL*     1.3    59.9    +      -       -      +
    357I  GLU*     4.6     1.1    +      -       -      +
    358I  ARG*     3.4    37.8    +      -       -      +
    372I  LEU      5.2     0.2    -      -       -      -
    377I  PRO*     5.2     4.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 355 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54I  ILE*     3.6    22.9    -      -       +      -
     66I  LEU*     4.0    15.5    -      -       +      -
    351I  LEU*     2.9    25.1    +      -       +      +
    352I  ALA*     3.5    12.3    -      -       -      +
    354I  GLY*     1.3    79.1    -      -       -      +
    356I  ARG*     1.3    65.9    +      -       -      +
    358I  ARG*     3.1     7.5    +      -       -      +
    359I  MET*     2.9    31.2    +      -       -      +
    372I  LEU*     3.6    39.9    -      -       +      +
    373I  VAL*     5.6     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 356 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53I  PRO      5.1     1.6    +      -       -      -
     54I  ILE*     3.4    39.0    -      -       -      +
     55I  GLU      2.9    27.6    +      -       -      +
     56I  GLU*     3.3    50.8    -      -       +      +
    352I  ALA*     3.6    18.7    +      -       -      +
    353I  ARG*     3.5    23.9    +      -       +      +
    355I  VAL*     1.3    76.6    -      -       -      +
    357I  GLU*     1.3    64.0    +      -       +      +
    359I  MET*     2.9    25.1    +      -       -      +
    360I  VAL*     3.4     3.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 357 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56I  GLU*     5.0     0.2    -      -       -      -
    353I  ARG*     3.8    16.2    +      -       -      +
    354I  GLY      5.4     0.9    -      -       -      +
    356I  ARG*     1.3    82.3    -      -       +      +
    358I  ARG*     1.3    57.7    +      -       -      +
    359I  MET      3.3     0.2    -      -       -      -
    360I  VAL*     3.3    16.8    -      -       +      +
    361I  MET*     3.1    31.1    -      -       -      +
    215L  LYS      5.4     0.7    -      -       -      +
    216L  LYS*     3.4    52.9    -      -       +      +
     33R    G      5.8     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 358 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351I  LEU*     5.2     0.4    -      -       -      +
    354I  GLY*     3.4    25.3    +      -       -      +
    355I  VAL      3.2    12.1    -      -       -      +
    356I  ARG      3.0     0.6    -      -       -      -
    357I  GLU*     1.3    79.8    -      -       -      +
    359I  MET*     1.3    61.1    +      -       -      +
    361I  MET*     3.9    19.7    -      -       +      +
    367I  LEU*     4.7     9.7    -      -       +      +
    371I  LYS      3.2    23.2    +      -       -      +
    372I  LEU*     3.8    23.5    +      -       +      +
    373I  VAL      3.9     6.1    +      -       -      -
    374I  ASN*     3.2    51.6    -      -       -      +
    291L  ARG*     3.9    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 359 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54I  ILE*     4.4    14.1    -      -       -      +
     56I  GLU*     3.5    40.4    -      -       -      +
     63I  GLY      5.1     0.2    -      -       -      -
     64I  LEU*     3.6    52.9    -      -       +      +
     66I  LEU*     5.7     0.7    -      -       -      -
    355I  VAL*     2.9    33.3    +      -       -      +
    356I  ARG*     2.9    10.1    +      -       -      +
    358I  ARG*     1.3    78.9    -      -       -      +
    360I  VAL*     1.3    58.1    +      -       -      +
    361I  MET      3.3     8.7    +      -       -      +
    364I  PRO*     5.1    12.0    -      -       -      +
    367I  LEU*     5.9     3.3    -      -       -      +
    372I  LEU*     3.7    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 360 (chain I). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56I  GLU*     3.2    36.1    -      -       -      +
    356I  ARG      3.7     0.2    -      -       -      +
    357I  GLU*     3.3    25.6    -      -       +      +
    359I  MET*     1.3    76.0    -      -       -      +
    361I  MET*     1.3    56.9    +      -       +      +
    364I  PRO*     6.0     2.9    -      -       -      -
    216L  LYS*     3.5    26.3    +      -       +      +
----------------------------------------------------------
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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