Contacts of the helix formed by residues 371 - 395 (chain B) in PDB entry 4MG5


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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    369B  ASP      3.9     0.6    +      -       -      +
    370B  LEU*     1.3    77.7    -      -       -      +
    372B  LEU*     1.3    65.2    +      -       -      +
    373B  HIS*     3.8     8.1    +      -       -      +
    374B  ASP*     3.1    33.0    +      -       -      +
    375B  GLN*     3.0    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 372 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370B  LEU      3.8     0.8    +      -       -      -
    371B  THR*     1.3    74.1    -      -       -      +
    373B  HIS*     1.3    65.2    +      -       +      +
    375B  GLN*     3.3    14.9    +      -       -      +
    376B  VAL*     2.9    40.0    +      -       +      +
    691D  HIS*     4.5    18.2    -      -       +      +
    694D  LEU*     3.9    32.3    -      -       +      +
    695D  GLN*     3.9    38.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 373 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    371B  THR*     3.2     8.2    -      -       -      +
    372B  LEU*     1.3    87.9    -      -       +      +
    374B  ASP*     1.3    61.0    +      -       -      +
    376B  VAL*     3.5     7.6    +      -       -      +
    377B  HIS*     3.0    27.0    +      -       -      +
    691D  HIS*     4.9    21.5    +      +       -      -
----------------------------------------------------------
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Residues in contact with ASP 374 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370B  LEU*     4.0    22.4    -      -       +      +
    371B  THR*     3.1    28.7    +      -       -      +
    373B  HIS*     1.3    77.6    -      -       -      +
    375B  GLN*     1.3    61.8    +      -       -      +
    377B  HIS*     3.3     6.8    +      -       -      +
    378B  LEU*     2.9    36.1    +      -       -      +
    461B  PHE*     4.2    28.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 375 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    362B  LYS*     4.7     5.0    -      -       -      +
    367B  PHE*     3.4    55.6    +      -       +      +
    368B  VAL*     3.4    18.8    +      -       -      +
    370B  LEU*     2.9    25.4    +      -       +      +
    371B  THR      3.0    15.0    +      -       -      +
    372B  LEU*     3.6    17.8    -      -       -      +
    374B  ASP*     1.3    76.5    -      -       -      +
    376B  VAL*     1.3    63.9    +      -       -      +
    378B  LEU      3.3     0.2    +      -       -      -
    379B  LEU*     3.1    25.5    +      -       -      +
    694D  LEU*     3.8    28.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 376 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    372B  LEU*     2.9    24.4    +      -       +      +
    373B  HIS*     3.5     8.5    -      -       -      +
    375B  GLN*     1.3    75.8    -      -       -      +
    377B  HIS*     1.3    57.8    +      -       -      +
    379B  LEU      3.4     0.2    +      -       -      -
    380B  GLU*     2.9    59.8    +      -       -      +
    690D  LEU*     3.7    12.0    -      -       +      +
    691D  HIS*     3.9    41.1    -      -       +      +
    694D  LEU*     3.6    21.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 377 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373B  HIS      3.0    17.8    +      -       -      +
    374B  ASP*     3.3     7.8    +      -       -      +
    376B  VAL*     1.3    79.9    -      -       +      +
    378B  LEU*     1.3    65.3    +      -       +      +
    380B  GLU*     3.8     9.4    +      -       -      +
    381B  CSO      3.1    28.0    +      -       +      +
    457B  GLY*     2.9    36.0    +      -       -      -
    460B  THR*     3.2    37.8    +      -       +      -
    461B  PHE*     3.4    20.0    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 378 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    367B  PHE*     3.9    15.7    -      -       +      -
    370B  LEU*     3.5    31.4    -      -       +      -
    374B  ASP      2.9    17.4    +      -       -      +
    375B  GLN      3.8     3.6    -      -       -      +
    377B  HIS*     1.3    81.1    -      -       +      +
    379B  LEU*     1.3    58.1    +      -       -      +
    381B  CSO      3.3     4.7    +      -       -      +
    382B  ALA*     3.0    31.9    +      -       -      +
    453B  LEU*     3.6    25.1    -      -       +      +
    454B  LEU*     3.9    19.1    -      -       +      +
    457B  GLY*     3.8    32.4    +      -       -      +
    458B  VAL*     4.0     2.7    -      -       -      +
    461B  PHE*     4.5     6.1    -      -       +      -
    475B  ILE*     4.0    12.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 379 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357B  MET*     4.2    29.2    -      -       +      +
    358B  ILE*     4.5    10.5    -      -       +      -
    361B  ALA*     3.9    16.2    -      -       +      -
    367B  PHE*     4.0    13.7    -      -       +      -
    375B  GLN      3.1    16.9    +      -       -      +
    376B  VAL      4.0     2.7    -      -       -      +
    378B  LEU*     1.3    73.6    -      -       -      +
    380B  GLU*     1.3    61.6    +      -       -      +
    382B  ALA      4.4     0.4    -      -       -      +
    383B  TRP*     2.9    35.7    +      -       +      +
    386B  ILE*     4.9     1.8    -      -       +      -
    453B  LEU*     3.9    17.7    -      -       +      -
    543B  MET*     3.6     4.4    -      -       +      +
    690D  LEU*     4.2    18.2    -      -       +      -
    694D  LEU*     3.7    33.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 380 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    376B  VAL*     2.9    42.7    +      -       -      +
    377B  HIS*     3.8    10.7    +      -       -      +
    378B  LEU      3.3     0.2    -      -       -      -
    379B  LEU*     1.3    75.7    -      -       -      +
    381B  CSO      1.3    50.8    +      -       -      +
    383B  TRP*     3.1    12.6    -      -       -      -
    542B  GLU      4.8     3.8    -      -       -      +
    543B  MET*     3.9    13.5    -      -       +      +
    546B  ALA*     3.5    30.6    -      -       +      +
    547B  HIS*     2.6    30.4    +      -       -      -
    688D  LYS*     5.3     3.8    -      -       -      +
    690D  LEU*     3.5    17.9    -      -       +      +
    691D  HIS*     5.0     4.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with CSO 381 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    516A  HIS*     3.9    17.8    +      -       -      -
    377B  HIS*     3.1    22.3    +      -       +      +
    378B  LEU      3.8     4.0    -      -       -      +
    379B  LEU      3.2     0.2    -      -       -      -
    380B  GLU*     1.3    77.9    +      -       -      +
    382B  ALA*     1.3    58.0    +      -       -      +
    383B  TRP*     5.2     0.2    -      -       -      -
    384B  LEU      5.2     0.7    +      -       -      -
    385B  GLU*     4.1     8.8    -      -       -      +
    456B  SER*     3.2    31.8    +      -       -      -
    457B  GLY*     3.8    12.3    -      -       -      +
    460B  THR*     4.6     8.1    +      -       -      +
    515B  ARG*     3.8    15.7    +      -       -      -
    518B  SER*     5.1     2.8    +      -       -      -
    547B  HIS*     3.5    23.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 382 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378B  LEU      3.0    16.4    +      -       -      +
    379B  LEU      4.7     0.2    -      -       -      +
    381B  CSO      1.3    78.8    +      -       -      -
    383B  TRP*     1.3    65.4    +      -       -      +
    384B  LEU      3.3     2.9    -      -       -      -
    385B  GLU*     3.1    11.6    +      -       -      +
    386B  ILE*     3.0    37.3    +      -       +      +
    452B  ILE*     3.8    28.0    -      -       +      +
    453B  LEU*     4.1     5.2    -      -       +      +
    456B  SER*     4.1     6.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 383 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354B  LEU*     3.8    19.3    -      -       +      -
    357B  MET*     3.3    25.1    -      -       -      +
    379B  LEU      2.9    13.5    +      -       -      +
    380B  GLU      3.1    25.6    +      -       -      -
    381B  CSO      5.0     0.2    -      -       -      -
    382B  ALA*     1.3    75.0    -      -       -      +
    384B  LEU*     1.3    81.4    +      -       +      +
    386B  ILE*     3.2     1.1    +      -       -      +
    387B  LEU*     3.0    51.3    +      -       +      +
    522B  MET*     3.7    34.5    -      -       +      +
    525B  LEU*     3.8    24.7    -      -       +      -
    540B  LEU*     3.9    21.8    -      -       +      -
    543B  MET*     3.2    57.1    +      -       +      -
    544B  LEU      4.3     2.0    -      -       -      -
    547B  HIS*     4.2     1.3    -      -       -      -
    602B  27E      4.9     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 384 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    381B  CSO      5.2     0.6    +      -       -      -
    382B  ALA      3.3     0.6    -      -       -      -
    383B  TRP*     1.3    96.8    -      -       +      +
    385B  GLU*     1.3    68.0    +      -       -      +
    387B  LEU*     3.4     3.3    +      -       +      +
    388B  MET*     3.0    29.5    +      -       +      +
    518B  SER*     3.4    35.2    -      -       -      +
    521B  GLY*     3.8     7.9    -      -       -      -
    522B  MET*     3.6    36.3    -      -       +      +
    602B  27E      3.4    52.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 385 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    512A  SER*     4.7     0.9    +      -       -      -
    381B  CSO      4.1     8.5    -      -       -      +
    382B  ALA*     3.1     9.6    +      -       -      +
    384B  LEU*     1.3    76.9    -      -       -      +
    386B  ILE*     1.3    58.2    +      -       -      +
    388B  MET*     3.3     3.5    +      -       -      +
    389B  ILE*     2.9    31.5    +      -       -      +
    452B  ILE*     3.7    16.5    -      -       +      +
    456B  SER*     2.8    33.8    +      -       -      -
    511B  LEU*     4.1     4.2    -      -       -      +
    514B  ILE*     3.8    20.0    -      -       +      +
    515B  ARG*     3.4    41.7    +      -       -      +
    518B  SER*     3.4    25.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 386 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357B  MET*     4.0    25.4    -      -       +      -
    360B  TRP*     3.8    28.3    -      -       +      -
    379B  LEU*     4.9     0.9    -      -       +      -
    382B  ALA*     3.0    30.3    +      -       +      +
    383B  TRP*     3.6     6.7    -      -       -      +
    385B  GLU*     1.3    74.9    -      -       -      +
    387B  LEU*     1.3    64.5    +      -       -      +
    389B  ILE*     3.4     8.3    -      -       -      +
    390B  GLY*     3.2    18.7    +      -       -      -
    449B  LYS*     3.7    30.8    -      -       +      +
    452B  ILE*     3.9    15.5    -      -       +      -
    453B  LEU*     4.2    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 387 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350B  ALA*     4.3    13.5    -      -       +      -
    353B  GLU*     3.5    42.0    -      -       +      +
    354B  LEU*     4.6     5.4    -      -       +      +
    357B  MET*     3.5    24.9    -      -       +      -
    383B  TRP*     3.0    42.7    +      -       +      +
    384B  LEU*     3.4     8.5    +      -       +      +
    386B  ILE*     1.3    76.1    -      -       -      +
    388B  MET*     1.3    58.1    +      -       +      +
    390B  GLY*     3.3     2.0    +      -       -      -
    391B  LEU*     2.9    28.2    +      -       -      +
    394B  ARG*     5.0     2.6    +      -       -      -
    602B  27E      3.9    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 388 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    384B  LEU*     3.0    21.3    +      -       +      +
    385B  GLU*     3.7     4.7    -      -       -      +
    387B  LEU*     1.3    75.2    -      -       -      +
    389B  ILE*     1.3    60.4    +      -       -      +
    391B  LEU*     3.3     7.2    +      -       -      +
    392B  VAL*     2.9    35.1    +      -       -      +
    424B  ILE*     3.4    29.2    -      -       +      -
    428B  LEU*     4.0    19.5    -      -       +      +
    514B  ILE*     4.9     4.0    -      -       +      +
    517B  MET*     3.4    37.2    -      -       +      +
    518B  SER*     3.7    19.1    -      -       -      -
    521B  GLY*     4.6     0.9    -      -       -      -
    602B  27E      3.0    39.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 389 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385B  GLU      2.9    16.6    +      -       -      +
    386B  ILE*     3.4    17.3    -      -       -      +
    388B  MET*     1.3    75.3    -      -       -      +
    390B  GLY*     1.3    60.8    +      -       -      +
    392B  VAL*     3.8     5.7    -      -       -      +
    393B  TRP*     2.9    28.4    +      -       -      +
    435B  PHE*     4.0    20.6    -      -       +      -
    445B  PHE*     3.5    14.7    -      -       +      -
    448B  LEU*     4.0    24.5    -      -       +      -
    449B  LYS*     4.2    18.8    -      -       +      +
    452B  ILE*     3.8    18.4    -      -       +      -
    511B  LEU*     4.6     1.3    -      -       +      -
    514B  ILE*     3.7    31.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 390 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386B  ILE      3.2     9.2    +      -       -      -
    387B  LEU*     3.7     4.0    -      -       -      -
    389B  ILE*     1.3    82.1    -      -       -      +
    391B  LEU*     1.3    65.1    +      -       -      +
    393B  TRP*     3.2     2.9    +      -       -      +
    394B  ARG*     2.9    40.6    +      -       -      +
    445B  PHE*     4.1    15.9    -      -       -      -
    449B  LYS*     5.5     2.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 391 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    387B  LEU      2.9    14.5    +      -       -      +
    388B  MET*     3.3     8.5    +      -       -      +
    390B  GLY*     1.3    75.4    -      -       -      +
    392B  VAL*     1.3    58.4    +      -       -      +
    394B  ARG*     3.4    16.0    +      -       -      +
    395B  SER*     2.7    40.2    +      -       -      +
    402B  LEU*     4.3    12.1    -      -       +      -
    403B  LEU      3.6    20.6    -      -       -      +
    404B  PHE*     3.6    46.0    -      -       +      +
    428B  LEU*     3.8    24.7    -      -       +      -
    602B  27E      3.6    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 392 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388B  MET      2.9    22.4    +      -       -      +
    389B  ILE*     3.8     7.2    -      -       -      +
    390B  GLY      3.3     0.2    -      -       -      -
    391B  LEU*     1.3    75.0    -      -       +      +
    393B  TRP*     1.3    63.5    +      -       -      +
    395B  SER*     3.2     5.1    +      -       -      -
    396B  MET*     3.2    19.2    +      -       -      +
    402B  LEU*     5.5     1.3    -      -       +      -
    428B  LEU*     3.9    34.1    -      -       +      +
    431B  THR*     3.7    14.1    -      -       +      -
    432B  SER*     3.4    31.6    +      -       -      +
    435B  PHE*     3.2    32.1    -      -       +      -
    517B  MET*     4.7     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 393 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389B  ILE      2.9    18.1    +      -       -      +
    390B  GLY      3.5     3.8    -      -       -      +
    392B  VAL*     1.3    77.3    -      -       -      +
    394B  ARG*     1.3    72.9    +      -       +      +
    396B  MET*     3.1    46.8    +      -       +      +
    397B  GLU      4.9     0.2    +      -       -      -
    435B  PHE*     4.6     3.8    -      -       +      -
    440B  LEU*     3.4    49.1    -      -       +      -
    442B  GLY*     3.4    36.3    -      -       -      -
    445B  PHE*     3.4    35.7    -      +       +      -
    601B  GOL      3.0    30.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 394 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326B  ILE*     4.0    43.7    -      -       +      +
    349B  LEU*     5.3     0.4    -      -       -      +
    353B  GLU*     3.5    22.7    +      -       -      -
    387B  LEU      5.0     2.2    +      -       -      -
    390B  GLY*     2.9    34.6    +      -       -      +
    391B  LEU*     3.7    26.7    -      -       -      +
    393B  TRP*     1.3    84.3    -      -       +      +
    395B  SER*     1.3    59.9    +      -       -      +
    396B  MET      3.2     1.1    +      -       -      -
    397B  GLU*     4.5     1.4    +      -       -      +
    398B  HIS*     3.7    15.9    -      -       -      -
    403B  LEU*     3.2    34.3    +      -       +      +
    404B  PHE*     3.1    25.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 395 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    391B  LEU*     2.7    23.9    +      -       -      +
    392B  VAL*     3.7     5.4    -      -       -      -
    393B  TRP      3.1     0.4    -      -       -      -
    394B  ARG*     1.3    76.6    -      -       -      +
    396B  MET*     1.3    64.4    +      -       -      +
    397B  GLU      3.4     1.3    -      -       -      -
    398B  HIS*     2.9    24.8    +      -       -      +
    401B  LYS      3.4    17.9    -      -       -      -
    402B  LEU*     3.3    14.6    -      -       -      +
    403B  LEU*     2.8    28.6    +      -       -      +
    432B  SER*     3.4    11.2    +      -       -      -
    604B  GOL      3.6     0.5    +      -       -      -
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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