Contacts of the helix formed by residues 371 - 395 (chain C) in PDB entry 1R5K


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 371 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    369C  ASP      5.7     0.2    -      -       -      +
    370C  LEU*     1.3    76.8    -      -       -      +
    372C  LEU*     1.3    64.6    +      -       -      +
    373C  HIS*     3.8     6.9    +      -       -      +
    374C  ASP*     3.0    27.4    +      -       -      +
    375C  GLN*     3.0    20.5    +      -       -      +
    471C  GLU*     2.9    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 372 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362C  LYS*     5.8     5.8    -      -       -      +
    370C  LEU      3.7     1.0    +      -       -      -
    371C  THR*     1.3    74.1    -      -       -      +
    373C  HIS*     1.3    66.4    +      -       +      +
    375C  GLN*     3.2    19.0    +      -       +      +
    376C  VAL*     3.2    34.2    +      -       +      +
    543C  MET      4.8    11.4    -      -       -      +
    544C  LEU*     4.7    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 373 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371C  THR*     3.2     6.0    +      -       -      +
    372C  LEU*     1.3    83.7    -      -       +      +
    374C  ASP*     1.3    72.2    +      -       -      +
    376C  VAL*     3.6     7.8    +      -       -      +
    377C  HIS*     3.2    32.6    +      +       +      +
----------------------------------------------------------
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Residues in contact with ASP 374 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370C  LEU*     4.4     5.2    -      -       +      -
    371C  THR*     3.0    16.1    +      -       -      +
    373C  HIS*     1.3    90.3    -      -       -      +
    375C  GLN*     1.3    63.8    +      -       -      +
    376C  VAL      3.2     0.4    -      -       -      -
    377C  HIS*     3.7     3.6    -      -       -      +
    378C  LEU*     3.0    28.3    +      -       -      +
    461C  PHE*     3.5    36.9    -      -       +      -
    468C  SER*     5.2     4.9    -      -       -      -
    471C  GLU*     2.7    45.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 375 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362C  LYS*     4.2    14.7    +      -       -      -
    367C  PHE*     3.4    62.7    +      -       +      +
    368C  VAL*     3.4    25.5    +      -       -      +
    370C  LEU*     2.9    27.8    +      -       +      -
    371C  THR      3.0    14.0    +      -       -      +
    372C  LEU*     3.2    19.2    +      -       +      +
    374C  ASP*     1.3    77.4    -      -       -      +
    376C  VAL*     1.3    64.0    +      -       +      +
    378C  LEU*     3.2     2.6    +      -       -      +
    379C  LEU*     3.1    22.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 376 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372C  LEU*     3.2    32.6    +      -       +      +
    373C  HIS*     3.9     8.1    -      -       -      +
    375C  GLN*     1.3    77.6    -      -       +      +
    377C  HIS*     1.3    58.7    +      -       -      +
    379C  LEU*     3.4     9.6    +      -       +      +
    380C  GLU*     2.8    34.5    +      -       -      +
    541C  LEU*     3.9    42.3    -      -       +      +
    542C  GLU*     4.7     1.6    -      -       -      +
    543C  MET      4.8     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 377 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373C  HIS*     3.2    26.8    +      +       +      +
    374C  ASP*     3.7     7.0    -      -       -      +
    375C  GLN      3.2     0.2    -      -       -      -
    376C  VAL*     1.3    78.9    -      -       -      +
    378C  LEU*     1.3    63.3    +      -       -      +
    380C  GLU*     3.2    19.5    +      -       -      +
    381C  CYS*     3.1    44.4    +      -       -      -
    457C  GLY      3.2    21.6    +      -       -      -
    460C  THR*     3.2    27.3    +      -       -      -
    461C  PHE*     3.2    28.3    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 378 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367C  PHE*     4.0    14.8    -      -       +      -
    370C  LEU*     3.4    33.0    -      -       +      -
    374C  ASP      3.0    15.9    +      -       -      +
    375C  GLN      3.6     5.2    -      -       -      +
    376C  VAL      3.2     0.2    -      -       -      -
    377C  HIS*     1.3    79.1    -      -       -      +
    379C  LEU*     1.3    61.2    +      -       -      +
    381C  CYS*     3.3     2.6    +      -       -      +
    382C  ALA*     3.2    24.8    +      -       -      +
    453C  LEU*     3.4    22.0    -      -       -      +
    454C  LEU*     3.9    22.7    -      -       +      +
    457C  GLY*     3.9    23.1    +      -       -      -
    458C  VAL      4.0     0.4    -      -       -      +
    461C  PHE*     3.5    23.8    -      -       +      -
    475C  ILE*     3.8    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 379 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354C  LEU*     5.7     2.0    -      -       +      -
    357C  MET*     4.1    30.5    -      -       +      +
    358C  ILE*     4.5    24.2    -      -       +      +
    361C  ALA*     3.9    16.4    -      -       +      -
    367C  PHE*     4.2    16.2    -      -       +      -
    375C  GLN*     3.1    22.7    +      -       +      +
    376C  VAL*     3.9     8.3    -      -       +      +
    378C  LEU*     1.3    74.1    -      -       -      +
    380C  GLU*     1.3    66.3    +      -       -      +
    382C  ALA*     4.4     1.6    -      -       -      +
    383C  TRP*     3.1    31.4    +      -       +      +
    453C  LEU*     3.9    20.0    -      -       +      -
    541C  LEU*     4.3    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 380 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    376C  VAL*     2.8    24.0    +      -       -      +
    377C  HIS*     3.2    21.5    +      -       -      +
    379C  LEU*     1.3    79.2    -      -       -      +
    381C  CYS*     1.3    61.8    +      -       -      +
    383C  TRP*     3.6    14.7    +      -       +      -
    522C  MET*     5.0     5.5    -      -       -      +
    538C  ASP*     5.3     9.6    -      -       -      +
    541C  LEU*     4.3    30.5    -      -       +      +
    542C  GLU*     6.1     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 381 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    377C  HIS*     3.1    37.0    +      -       -      +
    378C  LEU      4.1     1.6    -      -       -      +
    379C  LEU      3.2     0.2    -      -       -      -
    380C  GLU*     1.3    79.2    -      -       -      +
    382C  ALA*     1.3    58.1    +      -       -      +
    383C  TRP*     3.8     0.4    -      -       -      -
    384C  LEU      5.5     0.4    +      -       -      -
    385C  GLU*     3.5    16.1    -      -       -      +
    456C  SER*     4.0    19.0    -      -       -      +
    457C  GLY*     3.7    21.1    -      -       -      -
    460C  THR*     4.5     3.4    -      -       -      -
    515C  ARG*     5.1     3.8    +      -       -      +
    518C  SER*     5.2     3.3    +      -       -      -
    522C  MET*     5.9     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 382 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378C  LEU      3.2    15.7    +      -       -      +
    379C  LEU*     4.5     0.7    -      -       -      +
    381C  CYS*     1.3    78.8    -      -       -      +
    383C  TRP*     1.3    66.9    +      -       -      +
    384C  LEU      3.3     2.5    -      -       -      -
    385C  GLU*     3.1    10.2    +      -       -      +
    386C  ILE*     2.9    41.2    +      -       +      +
    452C  ILE*     3.8    24.2    -      -       +      +
    453C  LEU*     3.9     7.0    -      -       +      -
    456C  SER*     4.1     3.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 383 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350C  ALA*     5.0     1.1    -      -       +      -
    354C  LEU*     3.8    31.0    -      -       +      -
    357C  MET*     3.5    20.8    -      -       -      +
    379C  LEU*     3.1    24.5    +      -       +      +
    380C  GLU*     3.6    15.3    +      -       -      -
    381C  CYS      3.8     0.6    -      -       -      -
    382C  ALA*     1.3    76.2    -      -       -      +
    384C  LEU*     1.3    87.6    +      -       +      +
    386C  ILE      3.2     1.0    +      -       -      -
    387C  LEU*     2.8    57.7    +      -       +      +
    522C  MET*     3.8    31.3    -      -       +      +
    525C  LEU*     4.7     2.5    -      -       +      -
    537C  TYR*     3.4    55.3    -      +       +      +
    541C  LEU*     4.5    11.3    -      -       +      +
    602C  GW5      4.1    19.1    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 384 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    381C  CYS      5.5     0.2    +      -       -      -
    382C  ALA      3.3     0.2    -      -       -      -
    383C  TRP*     1.3   101.3    -      -       +      +
    385C  GLU*     1.3    60.8    +      -       -      +
    387C  LEU*     3.4     9.6    +      -       +      +
    388C  MET*     2.7    51.4    +      -       +      +
    518C  SER*     3.5    37.4    +      -       -      +
    521C  GLY*     4.1     8.5    -      -       -      -
    522C  MET*     3.8    35.6    -      -       +      +
    525C  LEU*     4.6     5.4    -      -       +      -
    602C  GW5      4.2    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 385 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    381C  CYS      3.5    17.0    -      -       -      +
    382C  ALA      3.1     8.6    +      -       -      +
    384C  LEU*     1.3    78.0    -      -       -      +
    386C  ILE*     1.3    58.1    +      -       -      +
    388C  MET*     3.1     4.0    +      -       -      +
    389C  ILE*     2.8    30.5    +      -       -      +
    452C  ILE*     3.6    20.5    -      -       +      +
    456C  SER*     2.8    27.1    +      -       -      -
    511C  LEU*     4.4     3.6    -      -       -      +
    514C  ILE*     3.8    21.7    -      -       +      +
    515C  ARG*     3.0    41.1    +      -       -      +
    518C  SER*     3.6    22.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 386 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357C  MET*     3.7    27.6    -      -       +      -
    360C  TRP*     3.7    27.4    -      -       +      -
    379C  LEU*     5.5     0.2    -      -       +      -
    382C  ALA*     2.9    37.3    +      -       +      +
    383C  TRP      3.6     3.4    -      -       -      +
    385C  GLU*     1.3    73.5    -      -       -      +
    387C  LEU*     1.3    69.3    +      -       +      +
    388C  MET      3.0     1.6    +      -       -      -
    389C  ILE*     3.3     8.2    -      -       -      +
    390C  GLY*     3.2    18.5    +      -       -      -
    449C  LYS*     4.1    32.0    -      -       +      +
    452C  ILE*     3.8    14.8    -      -       +      -
    453C  LEU*     4.1    13.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 387 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350C  ALA*     3.8    26.7    -      -       +      +
    353C  GLU*     3.6    32.1    -      -       +      +
    354C  LEU*     4.6     1.3    -      -       +      +
    357C  MET*     3.4    24.2    -      -       +      -
    383C  TRP*     2.8    45.2    +      -       +      +
    384C  LEU*     3.5     7.4    -      -       +      +
    386C  ILE*     1.3    75.5    -      -       +      +
    388C  MET*     1.3    62.3    +      -       -      +
    390C  GLY*     3.4     1.4    +      -       -      -
    391C  LEU*     3.1    21.5    +      -       -      +
    394C  ARG*     4.5     4.3    +      -       -      +
    602C  GW5      4.1    29.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 388 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    384C  LEU*     2.7    42.4    +      -       +      +
    385C  GLU*     3.5     5.8    -      -       -      +
    386C  ILE      3.0     0.2    -      -       -      -
    387C  LEU*     1.3    72.3    -      -       -      +
    389C  ILE*     1.3    60.3    +      -       -      +
    391C  LEU*     3.2     6.2    +      -       +      +
    392C  VAL*     3.0    33.3    +      -       -      +
    424C  ILE*     4.2    21.8    -      -       +      -
    428C  LEU*     3.8    17.7    -      -       +      +
    514C  ILE*     4.7     7.6    -      -       +      +
    517C  MET*     3.5    30.5    -      -       +      +
    518C  SER*     3.6    29.4    -      -       -      -
    521C  GLY*     4.5     4.3    -      -       -      -
    602C  GW5      4.4    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 389 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385C  GLU      2.8    17.0    +      -       -      +
    386C  ILE*     3.3    16.6    -      -       -      +
    388C  MET*     1.3    73.6    -      -       -      +
    390C  GLY*     1.3    60.6    +      -       -      +
    392C  VAL*     3.7     5.5    -      -       -      +
    393C  TRP*     2.9    27.9    +      -       -      +
    435C  PHE*     4.3    17.5    -      -       +      -
    445C  PHE*     4.0    16.4    -      -       +      -
    448C  LEU*     4.0    24.5    -      -       +      -
    449C  LYS*     4.1    17.7    -      -       +      -
    452C  ILE*     3.6    28.5    -      -       +      -
    511C  LEU*     4.6     1.6    -      -       +      -
    514C  ILE*     3.8    24.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 390 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386C  ILE      3.2     8.2    +      -       -      -
    387C  LEU      3.8     3.6    -      -       -      -
    388C  MET      3.1     0.8    -      -       -      -
    389C  ILE*     1.3    81.3    -      -       -      +
    391C  LEU*     1.3    64.0    +      -       -      +
    393C  TRP*     3.4     2.0    +      -       -      +
    394C  ARG*     3.1    41.5    +      -       -      +
    445C  PHE*     4.2    17.3    -      -       -      -
    449C  LYS*     5.5     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 391 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387C  LEU      3.1    13.8    +      -       -      +
    388C  MET*     3.5     7.9    -      -       -      +
    390C  GLY*     1.3    77.5    -      -       -      +
    392C  VAL*     1.3    58.2    +      -       -      +
    393C  TRP      3.1     0.3    +      -       -      -
    394C  ARG*     3.3    12.3    +      -       -      +
    395C  SER*     2.8    38.5    +      -       -      +
    402C  LEU*     4.4    11.4    -      -       +      -
    403C  LEU      3.7    23.8    -      -       -      +
    404C  PHE*     3.6    54.3    -      -       +      +
    428C  LEU*     3.9    28.3    -      -       +      -
    602C  GW5      4.2    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 392 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388C  MET      3.0    17.1    +      -       -      +
    389C  ILE*     3.7     5.2    -      -       -      +
    391C  LEU*     1.3    81.6    -      -       +      +
    393C  TRP*     1.3    63.2    +      -       -      +
    395C  SER*     3.2     3.9    +      -       -      -
    396C  MET*     3.2     5.2    +      -       -      +
    402C  LEU*     5.7     0.9    -      -       +      -
    428C  LEU*     3.6    41.5    -      -       +      +
    431C  THR*     3.9    12.8    -      -       +      -
    432C  SER*     2.6    41.0    +      -       -      +
    435C  PHE*     3.4    35.2    -      -       +      -
    514C  ILE*     5.8     0.4    -      -       +      -
    517C  MET*     4.6     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 393 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323C  GLU*     5.6     0.6    +      -       -      -
    389C  ILE      2.9    20.1    +      -       -      +
    390C  GLY*     3.7     4.5    -      -       -      +
    391C  LEU      3.1     0.4    -      -       -      -
    392C  VAL*     1.3    76.6    -      -       -      +
    394C  ARG*     1.3    78.9    +      -       +      +
    395C  SER      2.9     1.6    +      -       -      -
    396C  MET*     3.0    40.0    +      -       +      +
    435C  PHE*     5.1     3.8    -      -       +      -
    440C  LEU*     3.6    44.4    -      -       +      -
    441C  GLN*     3.9     2.0    -      -       -      -
    442C  GLY*     3.5    32.1    -      -       -      -
    445C  PHE*     3.4    43.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 394 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326C  ILE*     4.5    27.8    -      -       +      +
    353C  GLU*     4.4    22.9    +      -       -      +
    387C  LEU*     4.5     5.1    +      -       -      +
    390C  GLY*     3.1    35.8    +      -       -      +
    391C  LEU*     3.4    17.5    -      -       -      +
    393C  TRP*     1.3    87.6    -      -       +      +
    395C  SER*     1.3    56.6    +      -       -      +
    396C  MET      3.3     1.4    +      -       -      -
    397C  GLU      5.0     0.2    +      -       -      -
    398C  HIS*     3.8     5.9    +      -       -      -
    403C  LEU*     2.9    60.2    +      -       +      +
    404C  PHE*     3.1    24.4    +      -       -      +
    405C  ALA*     5.5     2.5    -      -       -      +
    406C  PRO*     6.0     0.9    -      -       -      -
    602C  GW5      5.6     3.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 395 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391C  LEU*     2.8    24.7    +      -       -      +
    392C  VAL      3.2     0.2    +      -       -      -
    393C  TRP      2.9     0.6    +      -       -      -
    394C  ARG*     1.3    71.8    -      -       -      +
    396C  MET*     1.3    64.8    +      -       -      +
    397C  GLU      3.5     1.8    -      -       -      -
    398C  HIS*     3.2    23.5    +      -       -      +
    399C  PRO*     5.2     0.2    -      -       -      +
    401C  LYS      3.6    16.9    -      -       -      +
    402C  LEU*     3.4    12.4    -      -       -      +
    403C  LEU*     2.8    30.6    +      -       -      +
    429C  LEU*     5.8     0.2    -      -       -      +
    432C  SER*     3.1    19.0    +      -       -      -
----------------------------------------------------------
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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