Contacts of the helix formed by residues 371 - 395 (chain D) in PDB entry 2I0J


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 D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370D  LEU*     1.3    79.3    -      -       -      +
    372D  LEU*     1.3    60.7    +      -       -      +
    373D  HIS*     4.1     6.1    +      -       -      +
    374D  ASP*     3.1    23.0    +      -       -      +
    375D  GLN*     2.8    27.5    +      -       -      +
    467D  LYS*     3.5    34.8    -      -       +      +
    471D  GLU*     3.1    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 372 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371D  THR*     1.3    73.2    -      -       -      +
    373D  HIS*     1.3    64.2    +      -       -      +
    375D  GLN*     3.1    14.8    +      -       +      +
    376D  VAL*     3.0    18.7    +      -       +      +
    541D  LEU*     3.7    23.3    -      -       +      -
    544D  LEU*     3.6    33.9    -      -       +      +
    545D  ASP*     3.7    37.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 373 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371D  THR*     3.3     5.4    +      -       -      +
    372D  LEU*     1.3    79.7    -      -       -      +
    374D  ASP*     1.3    79.1    +      -       -      +
    376D  VAL*     3.4     4.7    +      -       -      +
    377D  HIS*     3.1    37.6    +      +       +      +
    461D  PHE*     5.3     7.9    -      +       -      -
    537D  TYR*     2.8    36.2    +      +       -      +
    541D  LEU*     5.8     2.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 374 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370D  LEU*     4.3     8.4    -      -       +      +
    371D  THR*     3.1    25.4    +      -       -      +
    373D  HIS*     1.3    93.9    +      -       -      +
    375D  GLN*     1.3    65.2    +      -       -      +
    377D  HIS*     4.0     0.5    -      -       -      +
    378D  LEU*     3.2    29.6    +      -       -      +
    461D  PHE*     3.6    35.3    -      -       +      -
    468D  SER*     5.8     0.5    -      -       -      -
    471D  GLU*     2.8    31.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 375 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362D  LYS*     4.1    17.8    +      -       -      -
    367D  PHE*     3.6    58.8    -      -       +      +
    368D  VAL*     3.7    15.7    +      -       -      +
    370D  LEU*     2.9    29.1    +      -       +      -
    371D  THR      2.8    18.5    +      -       -      +
    372D  LEU*     3.1    13.4    +      -       -      +
    374D  ASP*     1.3    76.3    -      -       -      +
    376D  VAL*     1.3    62.1    +      -       -      +
    378D  LEU*     3.4     0.4    +      -       -      -
    379D  LEU*     3.2    21.7    +      -       -      +
    544D  LEU*     3.5    16.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 376 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372D  LEU*     3.0    21.8    +      -       +      +
    373D  HIS*     3.8     4.7    -      -       -      +
    375D  GLN*     1.3    77.9    -      -       -      +
    377D  HIS*     1.3    54.8    +      -       -      +
    379D  LEU*     4.8     1.8    -      -       -      -
    380D  GLU*     2.9    27.5    +      -       -      +
    537D  TYR*     3.5    50.9    -      -       +      +
    540D  LEU*     3.8     8.3    -      -       +      +
    541D  LEU*     3.4    32.3    -      -       +      +
    544D  LEU*     3.1    23.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 377 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373D  HIS*     3.1    31.2    +      +       +      +
    374D  ASP*     4.0     3.1    -      -       -      +
    375D  GLN      3.4     0.2    -      -       -      -
    376D  VAL*     1.3    77.0    -      -       -      +
    378D  LEU*     1.3    62.1    +      -       -      +
    380D  GLU*     4.0    15.5    -      -       -      +
    381D  SER*     3.1    27.3    +      -       -      -
    457D  GLY*     2.8    25.7    +      -       -      -
    460D  THR*     2.7    45.6    +      -       -      -
    461D  PHE*     3.3    26.0    -      +       +      -
    537D  TYR*     4.6     8.7    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 378 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367D  PHE*     3.7    20.0    -      -       +      -
    370D  LEU*     3.7    30.1    -      -       +      -
    374D  ASP      3.2    17.3    +      -       -      +
    375D  GLN      3.8     3.6    -      -       -      +
    377D  HIS*     1.3    74.3    -      -       -      +
    379D  LEU*     1.3    61.5    +      -       -      +
    381D  SER*     3.4     4.9    +      -       -      -
    382D  ALA*     3.0    29.6    +      -       -      +
    453D  LEU*     3.5    26.7    -      -       +      +
    454D  LEU*     3.8    23.1    -      -       +      +
    456D  SER*     4.8     0.3    -      -       -      -
    457D  GLY      3.9     6.7    -      -       -      +
    458D  VAL*     3.8    20.4    -      -       -      +
    461D  PHE*     3.9    12.6    -      -       +      -
    475D  ILE*     4.4     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 379 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357D  MET*     4.4    24.2    -      -       +      -
    358D  ILE*     4.0    20.9    -      -       +      -
    361D  ALA*     3.8    18.4    -      -       +      -
    367D  PHE*     4.2     4.0    -      -       +      -
    375D  GLN      3.2    12.4    +      -       -      +
    376D  VAL*     4.1     2.7    -      -       -      +
    378D  LEU*     1.3    77.9    -      -       -      +
    380D  GLU*     1.3    66.3    +      -       -      +
    382D  ALA*     5.0     0.2    -      -       -      +
    383D  TRP*     2.8    30.6    +      -       +      +
    386D  ILE*     4.7     1.3    -      -       +      -
    453D  LEU*     3.4    27.1    -      -       +      -
    540D  LEU*     4.0    15.5    -      -       +      -
    544D  LEU*     4.0    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 380 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    376D  VAL      2.9    20.3    +      -       -      +
    377D  HIS*     4.0    14.1    -      -       -      +
    379D  LEU*     1.3    76.2    -      -       -      +
    381D  SER*     1.3    60.2    +      -       -      +
    383D  TRP*     3.0    25.8    +      -       -      -
    522D  MET*     5.0     4.3    -      -       -      +
    536D  LEU*     5.0     8.3    -      -       +      +
    537D  TYR*     3.2    45.4    +      -       +      +
    540D  LEU*     3.3    19.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 381 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    377D  HIS*     3.1    23.8    +      -       -      -
    378D  LEU      3.6     4.7    -      -       -      -
    379D  LEU      3.0     0.4    -      -       -      -
    380D  GLU*     1.3    81.4    -      -       -      +
    382D  ALA*     1.3    57.1    +      -       -      +
    383D  TRP      3.8     0.2    -      -       -      -
    385D  GLU*     3.9    12.1    -      -       -      +
    456D  SER*     3.5     4.2    +      -       -      -
    457D  GLY*     3.2    31.9    +      -       -      -
    460D  THR*     4.7     2.6    +      -       -      +
    515D  ARG*     5.2     2.6    +      -       -      -
    518D  SER*     5.2     3.3    +      -       -      -
    522D  MET*     6.1     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 382 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378D  LEU      3.0    11.9    +      -       -      +
    379D  LEU      3.0     3.3    +      -       -      -
    381D  SER*     1.3    79.5    -      -       -      +
    383D  TRP*     1.3    64.1    +      -       -      +
    384D  LEU      3.3     2.7    -      -       -      -
    385D  GLU*     3.4     6.7    +      -       -      +
    386D  ILE*     3.0    34.6    +      -       +      +
    452D  ILE*     3.9    16.8    -      -       +      +
    453D  LEU*     4.2     2.7    -      -       -      -
    456D  SER*     3.4    27.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 383 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  I0G      4.3    13.7    -      -       +      -
    350D  ALA*     4.9     4.5    -      -       +      -
    354D  LEU*     3.9    30.3    -      -       +      -
    357D  MET*     3.6    15.1    -      -       -      +
    379D  LEU*     2.8    19.3    +      -       +      +
    380D  GLU*     3.0    27.6    +      -       -      -
    381D  SER      5.1     0.2    -      -       -      -
    382D  ALA*     1.3    73.9    -      -       -      +
    384D  LEU*     1.3   102.3    +      -       +      +
    386D  ILE*     3.3     2.4    +      -       -      +
    387D  LEU*     2.9    49.7    +      -       +      +
    522D  MET*     3.4    34.4    -      -       +      +
    525D  LEU*     5.1    10.8    -      -       +      -
    536D  LEU*     3.7    27.2    -      -       +      +
    540D  LEU*     5.3     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 384 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  I0G      3.5    35.2    -      -       +      -
    382D  ALA      3.3     0.2    -      -       -      -
    383D  TRP*     1.3   108.3    -      -       +      +
    385D  GLU*     1.3    67.3    +      -       -      +
    387D  LEU*     4.3     5.8    -      -       +      -
    388D  MET*     2.9    50.2    +      -       +      +
    518D  SER*     3.5    32.3    +      -       -      +
    521D  GLY*     3.9    20.0    -      -       -      +
    522D  MET*     3.8    15.5    -      -       +      -
    525D  LEU*     5.7     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 385 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    512C  SER*     4.9     0.2    +      -       -      -
    381D  SER      3.9     6.3    -      -       -      +
    382D  ALA*     3.4     6.4    +      -       -      +
    383D  TRP      3.3     0.4    -      -       -      -
    384D  LEU*     1.3    76.6    -      -       -      +
    386D  ILE*     1.3    57.7    +      -       -      +
    388D  MET*     3.3     2.8    +      -       -      +
    389D  ILE*     2.9    29.9    +      -       -      +
    452D  ILE*     3.7    22.1    -      -       +      +
    456D  SER*     2.5    29.3    +      -       -      -
    511D  LEU*     4.2     4.5    -      -       -      +
    514D  ILE*     3.7    20.8    -      -       +      +
    515D  ARG*     3.1    49.2    +      -       -      +
    518D  SER*     3.4    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 386 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357D  MET*     3.9    26.7    -      -       +      -
    360D  TRP*     3.6    28.3    -      -       +      -
    379D  LEU*     4.7     0.7    -      -       +      -
    382D  ALA      3.0    25.4    +      -       -      +
    383D  TRP      3.6     3.8    -      -       -      +
    385D  GLU*     1.3    74.1    -      -       -      +
    387D  LEU*     1.3    65.6    +      -       -      +
    389D  ILE*     3.1    11.1    -      -       -      +
    390D  GLY*     3.1    19.8    +      -       -      -
    449D  LYS*     4.0    27.4    -      -       +      +
    452D  ILE*     3.8    15.9    -      -       +      -
    453D  LEU*     3.8    27.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 387 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  I0G      3.2    38.0    +      -       +      +
    350D  ALA*     3.6    35.9    -      -       +      +
    353D  GLU*     3.9    26.9    -      -       +      +
    354D  LEU*     5.2     0.4    -      -       +      -
    357D  MET*     3.3    23.8    -      -       +      -
    383D  TRP*     2.9    40.6    +      -       +      +
    384D  LEU*     3.7     8.3    -      -       +      +
    386D  ILE*     1.3    75.6    -      -       +      +
    388D  MET*     1.3    58.2    +      -       -      +
    390D  GLY*     3.3     2.3    +      -       -      -
    391D  LEU      3.0    21.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 388 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  I0G      3.9    33.0    -      -       +      -
    384D  LEU*     2.9    45.4    +      -       +      +
    385D  GLU*     3.7     4.3    -      -       -      +
    387D  LEU*     1.3    73.8    -      -       -      +
    389D  ILE*     1.3    56.4    +      -       -      +
    390D  GLY      3.0     1.6    -      -       -      -
    391D  LEU*     2.9     9.6    +      -       -      +
    392D  VAL*     2.7    38.2    +      -       -      +
    424D  ILE*     4.3    11.9    -      -       +      -
    428D  LEU*     4.1    17.9    -      -       +      -
    514D  ILE*     4.7     7.9    -      -       +      +
    517D  MET*     3.8    45.5    -      -       +      +
    518D  SER*     4.0     5.8    -      -       -      -
    521D  GLY*     4.4     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 389 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385D  GLU      2.9    19.2    +      -       -      +
    386D  ILE*     3.1    15.3    -      -       -      +
    388D  MET*     1.3    72.3    -      -       -      +
    390D  GLY*     1.3    65.1    +      -       -      +
    392D  VAL*     4.0     6.5    -      -       -      +
    393D  TRP*     3.1    22.7    +      -       -      +
    435D  PHE*     4.2    15.9    -      -       +      -
    445D  PHE*     3.3    15.1    -      -       +      -
    448D  LEU*     4.0    23.8    -      -       +      -
    449D  LYS*     3.5    28.7    -      -       +      +
    452D  ILE*     3.8    17.9    -      -       +      -
    511D  LEU*     4.2     2.9    -      -       +      -
    514D  ILE*     3.6    30.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 390 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386D  ILE      3.1     7.6    +      -       -      -
    387D  LEU*     3.6     4.5    -      -       -      -
    388D  MET      3.0     1.2    -      -       -      -
    389D  ILE*     1.3    82.3    -      -       -      +
    391D  LEU*     1.3    67.1    +      -       -      +
    393D  TRP*     3.2     6.4    +      -       -      +
    394D  ARG*     3.0    32.0    +      -       -      +
    445D  PHE*     4.0    14.8    -      -       -      -
    449D  LYS*     5.7     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 391 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  I0G      4.1     8.5    -      -       +      -
    387D  LEU      3.0    12.3    +      -       -      +
    388D  MET      2.9     8.1    +      -       -      +
    390D  GLY*     1.3    70.5    -      -       -      +
    392D  VAL*     1.3    57.8    -      -       -      +
    393D  TRP      2.6    15.7    +      -       -      -
    394D  ARG*     2.8    30.0    +      -       -      +
    395D  SER*     3.0    32.6    +      -       -      +
    402D  LEU*     4.2    10.5    -      -       +      -
    403D  LEU      3.4    29.6    -      -       -      +
    404D  PHE*     3.4    42.0    -      -       +      +
    428D  LEU*     3.9    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 392 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388D  MET      2.7    20.2    +      -       -      +
    389D  ILE*     4.0     6.1    -      -       -      +
    391D  LEU*     1.3    74.9    -      -       -      +
    393D  TRP*     1.3    59.5    +      -       -      +
    395D  SER*     3.7     2.9    +      -       -      -
    396D  MET*     3.6     7.1    -      -       -      +
    402D  LEU*     5.6     0.7    -      -       +      -
    428D  LEU*     3.6    43.3    -      -       +      +
    431D  THR*     3.3    30.5    -      -       +      -
    432D  SER*     3.1    29.0    +      -       -      -
    435D  PHE*     3.3    26.5    -      -       +      -
    514D  ILE*     5.5     0.9    -      -       +      -
    517D  MET*     4.5     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 393 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389D  ILE      3.1    19.0    +      -       -      +
    390D  GLY      3.3     5.2    -      -       -      +
    391D  LEU      2.6     5.3    +      -       -      -
    392D  VAL*     1.3    71.8    -      -       -      +
    394D  ARG*     1.3    68.8    +      -       +      +
    395D  SER      3.1     5.4    +      -       -      -
    396D  MET*     3.1    53.0    +      -       +      +
    435D  PHE*     4.7     2.7    -      +       +      -
    440D  LEU*     3.4    45.3    -      -       +      -
    441D  GLN      4.0     1.8    -      -       -      -
    442D  GLY*     3.6    29.2    -      -       -      -
    445D  PHE*     3.4    35.7    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 394 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  I0G      2.8    33.5    +      -       -      -
    326D  ILE*     4.6    33.3    -      -       +      +
    353D  GLU*     4.0    11.8    +      -       -      -
    390D  GLY*     3.0    33.7    +      -       -      +
    391D  LEU*     2.8    24.2    +      -       -      +
    393D  TRP*     1.3    83.5    -      -       +      +
    395D  SER*     1.3    55.2    +      -       -      +
    396D  MET      3.1     4.4    +      -       -      -
    397D  GLU*     4.5     1.2    +      -       -      +
    398D  HIS*     3.6     7.6    -      -       -      -
    403D  LEU*     3.0    47.0    +      -       +      +
    404D  PHE      3.0    22.4    +      -       -      -
    405D  ALA*     5.7     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 395 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391D  LEU*     3.0    20.8    +      -       -      +
    392D  VAL      4.1     1.1    -      -       -      -
    393D  TRP      3.1     0.8    -      -       -      -
    394D  ARG*     1.3    75.9    -      -       -      +
    396D  MET*     1.3    60.1    +      -       -      +
    397D  GLU      3.4     2.0    -      -       -      -
    398D  HIS*     3.6    14.4    +      -       -      -
    399D  PRO*     5.1     0.2    -      -       -      +
    401D  LYS      3.6    20.1    -      -       -      +
    402D  LEU*     3.1    12.5    -      -       -      +
    403D  LEU*     2.5    31.0    +      -       -      +
    432D  SER*     2.7    27.3    +      -       -      -
    436D  ARG*     4.3     2.4    +      -       -      -
----------------------------------------------------------
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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