Contacts of the helix formed by residues 374 - 400 (chain B) in PDB entry 6EBT


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 PRO 374 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343B  ARG*     3.5    32.3    -      -       +      +
    346B  GLY      6.2     1.3    -      -       -      +
    358B  LEU*     3.6    32.5    -      -       +      -
    372B  VAL*     3.4     7.2    -      -       +      +
    373B  ASN*     1.3    80.5    -      -       +      +
    375B  THR*     1.3    63.1    +      -       -      +
    376B  GLN      3.3     2.7    -      -       -      -
    377B  CYS*     3.1    22.6    +      -       -      +
    378B  GLU*     3.2    22.5    +      -       -      +
    434B  CYS*     6.4     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 375 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361B  ASN*     5.2     2.1    +      -       -      -
    362B  GLU*     2.9    38.9    +      -       +      +
    373B  ASN*     2.8    32.2    +      -       +      +
    374B  PRO*     1.3    72.8    -      -       -      +
    376B  GLN*     1.3    70.2    +      -       -      +
    378B  GLU*     3.1    19.5    +      -       -      +
    379B  ALA*     3.1    22.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 376 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    361B  ASN*     4.2     9.6    -      -       -      +
    362B  GLU*     5.2     4.2    +      -       -      -
    374B  PRO      3.3     0.4    -      -       -      -
    375B  THR*     1.3    80.0    +      -       -      +
    377B  CYS*     1.3    65.3    +      -       -      +
    379B  ALA*     3.4    10.6    +      -       -      +
    380B  MET*     3.0    24.4    +      -       -      +
    429B  SER*     2.6    39.5    +      -       -      +
    430B  PHE*     3.6    20.4    +      -       +      +
    433B  ASN*     3.5    42.3    -      -       +      +
    434B  CYS*     4.0    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 377 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339B  ALA*     3.4    28.3    -      -       -      +
    342B  ILE*     4.0    12.1    -      -       -      -
    343B  ARG*     3.8    26.2    -      -       +      +
    358B  LEU*     4.5     3.6    -      -       -      -
    374B  PRO*     3.1    22.2    +      -       +      +
    376B  GLN*     1.3    77.7    -      -       -      +
    378B  GLU*     1.3    58.1    +      -       -      +
    380B  MET*     3.8     0.7    -      -       -      +
    381B  THR*     2.8    35.1    +      -       -      +
    430B  PHE*     3.6    23.1    -      -       -      -
    434B  CYS*     4.6     2.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 378 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343B  ARG*     3.5    19.6    +      -       -      +
    373B  ASN*     4.9     5.5    -      -       -      +
    374B  PRO*     3.4    27.3    -      -       +      +
    375B  THR*     3.1    22.4    +      -       -      +
    377B  CYS*     1.3    75.0    -      -       -      +
    379B  ALA*     1.3    59.7    +      -       -      +
    381B  THR*     3.2     7.3    +      -       -      -
    382B  MET*     2.9    43.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 379 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    375B  THR      3.1    12.8    +      -       -      +
    376B  GLN*     3.9    14.1    -      -       -      +
    378B  GLU*     1.3    75.8    -      -       -      +
    380B  MET*     1.3    57.5    +      -       -      +
    382B  MET*     3.8    14.8    -      -       +      +
    383B  VAL*     3.0    35.9    +      -       +      +
    426B  ALA*     5.3     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 380 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214B  LEU*     4.8     0.7    -      -       +      -
    335B  LEU*     3.7    37.9    -      -       +      +
    339B  ALA*     3.7    21.8    -      -       +      -
    376B  GLN      3.0    17.5    +      -       -      +
    377B  CYS*     3.8     3.4    -      -       -      +
    379B  ALA*     1.3    77.2    -      -       -      +
    381B  THR*     1.3    58.8    +      -       -      +
    383B  VAL*     3.1    10.4    +      -       -      +
    384B  ALA*     2.9    26.0    +      -       -      +
    423B  LEU*     5.4     0.7    -      -       -      -
    426B  ALA*     3.4    46.7    -      -       +      +
    427B  SER*     3.5    17.7    -      -       -      +
    430B  PHE*     3.9    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 381 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  MET*     3.4    38.0    -      -       -      +
    339B  ALA*     3.6    21.3    -      -       +      -
    340B  ASN*     4.1     7.9    -      -       +      +
    343B  ARG*     3.2    28.3    +      -       -      +
    377B  CYS      2.8    22.7    +      -       -      +
    378B  GLU*     3.2    10.6    +      -       -      -
    380B  MET*     1.3    75.1    -      -       -      +
    382B  MET*     1.3    61.4    +      -       -      +
    384B  ALA*     3.4     2.5    +      -       -      -
    385B  ALA*     3.1    19.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 382 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    378B  GLU*     2.9    28.4    +      -       +      +
    379B  ALA*     3.8    15.5    -      -       +      +
    381B  THR*     1.3    74.6    +      -       -      +
    383B  VAL*     1.3    65.3    +      -       -      +
    385B  ALA*     3.2     8.3    +      -       -      +
    386B  GLN*     3.0    22.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 383 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    379B  ALA*     3.0    21.1    +      -       +      +
    380B  MET*     3.4    10.3    -      -       -      +
    382B  MET*     1.3    76.1    -      -       +      +
    384B  ALA*     1.3    63.7    +      -       -      +
    386B  GLN*     3.1     8.2    +      -       -      +
    387B  VAL*     2.9    23.8    +      -       +      +
    422B  LEU*     3.6    51.4    -      -       +      +
    423B  LEU*     4.0    16.4    -      -       +      +
    426B  ALA*     4.1    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 384 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332B  ALA*     3.5    35.8    -      -       +      +
    335B  LEU*     5.0     3.6    -      -       +      -
    336B  MET*     3.8    19.5    -      -       +      +
    380B  MET*     2.9    14.2    +      -       -      +
    381B  THR*     3.6    10.3    -      -       -      +
    382B  MET      3.2     0.2    -      -       -      -
    383B  VAL*     1.3    79.1    -      -       -      +
    385B  ALA*     1.3    62.6    +      -       -      +
    387B  VAL*     3.2     5.4    +      -       -      +
    388B  MET*     3.2    28.0    +      -       +      +
    423B  LEU*     5.3     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 385 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  MET*     3.9     8.8    -      -       +      +
    381B  THR      3.1    13.3    +      -       -      +
    382B  MET*     3.2    10.7    +      -       -      +
    384B  ALA*     1.3    75.6    -      -       -      +
    386B  GLN*     1.3    64.4    +      -       -      +
    388B  MET*     3.2    17.2    +      -       -      +
    389B  GLY*     3.1    17.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 386 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    382B  MET      3.0    12.9    +      -       -      +
    383B  VAL*     3.1    12.8    +      -       -      +
    385B  ALA*     1.3    77.6    -      -       -      +
    387B  VAL*     1.3    50.8    +      -       -      +
    389B  GLY*     3.2     4.2    +      -       -      -
    390B  ASN*     2.8    63.9    +      -       -      +
    418B  HIS*     4.0    27.1    -      -       +      -
    422B  LEU*     4.0    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 387 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325B  SER*     5.2     1.9    +      -       -      +
    328B  MET*     3.4    35.7    -      -       +      +
    329B  ASN*     4.1     4.0    -      -       +      +
    332B  ALA*     3.9     6.7    -      -       +      -
    383B  VAL*     2.9    21.9    +      -       +      +
    384B  ALA      3.2     7.6    +      -       -      +
    386B  GLN*     1.3    75.8    -      -       +      +
    388B  MET*     1.3    58.5    +      -       -      +
    390B  ASN*     3.3     2.5    +      -       -      +
    391B  HIS*     2.9    28.1    +      -       -      +
    419B  SER*     3.8    34.7    +      -       -      +
    422B  LEU*     5.2     1.8    -      -       +      -
    423B  LEU*     3.7    28.7    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    395A  THR*     3.7    16.8    -      -       +      +
    396A  VAL*     5.6     4.9    -      -       -      -
    399A  SER*     3.6    32.3    -      -       -      -
    329B  ASN*     3.5    22.7    -      -       -      +
    332B  ALA*     4.1    24.2    -      -       +      +
    333B  CYS*     4.1     7.0    -      -       -      +
    336B  MET*     4.0    16.2    -      -       +      -
    384B  ALA      3.2    16.2    +      -       -      +
    385B  ALA*     3.2    14.1    +      -       -      +
    387B  VAL*     1.3    76.6    -      -       -      +
    389B  GLY*     1.3    61.1    +      -       -      +
    391B  HIS*     3.2    11.8    +      -       -      +
    392B  VAL*     3.4    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 389 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385B  ALA      3.1    10.7    +      -       -      -
    386B  GLN*     3.2     5.8    +      -       -      -
    388B  MET*     1.3    75.5    -      -       -      +
    390B  ASN*     1.3    66.8    +      -       -      +
    392B  VAL*     3.1    18.1    +      -       -      +
    393B  ALA*     3.1    12.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 390 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325B  SER*     4.6     0.7    -      -       -      +
    386B  GLN*     2.8    47.2    +      -       -      +
    387B  VAL      3.5     1.6    -      -       -      +
    389B  GLY*     1.3    72.2    -      -       -      +
    391B  HIS*     1.3    56.4    +      -       -      +
    393B  ALA*     3.2     4.8    +      -       -      +
    394B  VAL*     2.9    33.5    +      -       -      +
    415B  ASN*     3.2    32.7    +      -       +      +
    418B  HIS*     3.1    29.2    +      -       -      +
    419B  SER*     3.1    31.8    +      -       -      +
    422B  LEU*     5.1     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 391 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  GLY*     5.2     1.7    -      -       -      -
    329A  ASN*     3.3    27.5    +      -       -      +
    391A  HIS*     3.3    33.2    +      +       -      -
    392A  VAL*     6.3     0.2    -      -       +      -
    322B  VAL*     3.7    12.1    -      -       +      -
    325B  SER*     2.8    31.6    +      -       -      +
    326B  GLY*     3.3    25.6    -      -       -      -
    329B  ASN*     4.0    20.2    -      -       +      +
    387B  VAL*     2.9    13.4    +      -       +      +
    388B  MET      3.5     9.6    -      -       -      +
    389B  GLY      3.1     0.8    -      -       -      -
    390B  ASN*     1.3    74.7    -      -       -      +
    392B  VAL*     1.3    63.5    +      -       +      +
    394B  VAL*     3.3     1.1    +      -       -      +
    395B  THR*     2.8    38.8    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    392A  VAL*     3.4    33.0    -      -       +      -
    388B  MET      3.4    11.8    +      -       -      +
    389B  GLY*     3.1     9.7    +      -       -      +
    391B  HIS*     1.3    77.8    -      -       +      +
    393B  ALA*     1.3    61.8    +      -       -      +
    395B  THR*     3.1     7.4    +      -       +      +
    396B  VAL*     2.9    43.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 393 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    389B  GLY      3.1    11.2    +      -       -      +
    390B  ASN*     3.4     8.5    -      -       -      +
    392B  VAL*     1.3    78.7    -      -       -      +
    394B  VAL*     1.3    62.0    +      -       -      +
    396B  VAL*     3.4     5.7    +      -       -      +
    397B  GLY      3.2    17.3    +      -       -      -
    411B  MET*     3.5    19.0    -      -       +      +
    415B  ASN*     3.8    24.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 394 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321B  LEU      4.0     9.4    -      -       -      +
    322B  VAL*     4.0    23.4    -      -       +      +
    325B  SER*     3.9    15.5    -      -       -      +
    390B  ASN      2.9    18.5    +      -       -      +
    391B  HIS      3.6     6.5    -      -       -      +
    392B  VAL      3.3     0.2    -      -       -      -
    393B  ALA*     1.3    76.3    -      -       -      +
    395B  THR*     1.3    57.6    +      -       -      +
    397B  GLY*     3.4     0.5    +      -       -      -
    398B  GLY*     2.8    27.0    +      -       -      -
    411B  MET*     4.7     4.3    -      -       -      -
    412B  MET*     3.6    35.3    -      -       +      +
    415B  ASN*     3.4    24.2    -      -       +      -
    416B  VAL*     4.1     9.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 395 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  ASN*     2.9    35.4    +      -       -      +
    333A  CYS*     3.4    23.8    -      -       -      -
    388A  MET*     3.7    22.9    -      -       +      -
    322B  VAL*     4.3     3.3    -      -       -      +
    391B  HIS*     2.8    31.3    +      -       -      -
    392B  VAL*     3.1    10.5    +      -       +      -
    394B  VAL*     1.3    77.4    -      -       -      +
    396B  VAL*     1.3    64.2    +      -       +      +
    398B  GLY      3.4     0.5    +      -       -      -
    399B  SER*     3.0    23.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 396 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    388A  MET*     5.7     5.4    -      -       -      -
    392B  VAL*     2.9    33.3    +      -       +      +
    393B  ALA*     3.9     5.8    -      -       -      +
    395B  THR*     1.3    77.9    -      -       +      +
    397B  GLY*     1.3    62.9    +      -       -      +
    399B  SER*     2.9    14.6    +      -       -      +
    400B  ASN*     2.8    36.6    +      -       -      +
    408B  PHE*     5.5     4.3    -      -       +      -
    411B  MET*     5.8     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 397 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    393B  ALA      3.2     8.9    +      -       -      -
    394B  VAL      3.8     1.1    -      -       -      -
    396B  VAL*     1.3    79.4    -      -       -      +
    398B  GLY*     1.3    61.9    +      -       -      +
    400B  ASN*     3.1    10.7    +      -       -      -
    406B  ASN*     3.1    15.4    +      -       -      -
    408B  PHE*     3.7    31.6    -      -       -      +
    411B  MET*     3.7    13.4    -      -       -      +
    412B  MET*     3.7     7.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 398 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  CYS*     4.2    13.7    -      -       -      +
    337A  LYS*     5.2     2.4    -      -       -      +
    317B  ALA*     5.2     3.5    -      -       -      +
    318B  HIS      5.1     4.6    +      -       -      -
    319B  ASP*     4.4     7.9    -      -       -      +
    322B  VAL*     4.1     8.3    -      -       -      -
    394B  VAL      2.8    17.3    +      -       -      -
    395B  THR      3.8     2.2    -      -       -      -
    396B  VAL      3.4     0.2    -      -       -      -
    397B  GLY*     1.3    72.3    -      -       -      +
    399B  SER*     1.3    59.5    +      -       -      +
    400B  ASN      3.5     0.5    +      -       -      -
    401B  GLY*     4.2     2.1    +      -       -      -
    406B  ASN*     3.8    10.4    +      -       -      -
    412B  MET*     3.4    24.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 399 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  CYS*     3.9    14.1    -      -       -      +
    336A  MET*     3.4    31.0    -      -       -      +
    337A  LYS*     4.0     9.3    +      -       -      -
    340A  ASN*     6.0     0.5    -      -       -      +
    388A  MET*     3.6    28.2    -      -       -      +
    395B  THR      3.0    14.0    +      -       -      -
    396B  VAL*     2.9    19.1    +      -       -      +
    397B  GLY      3.1     0.4    -      -       -      -
    398B  GLY*     1.3    76.1    -      -       -      +
    400B  ASN*     1.3    65.6    +      -       -      +
    401B  GLY      3.5     3.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 400 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  MET*     5.6     2.3    -      -       -      +
    396B  VAL*     2.8    36.9    +      -       -      +
    397B  GLY      3.1     7.7    +      -       -      +
    399B  SER*     1.3    84.3    +      -       -      +
    401B  GLY*     1.3    66.3    +      -       -      +
    402B  HIS*     3.5    24.4    +      -       +      +
    406B  ASN*     4.1     1.1    -      -       -      -
    407B  VAL      5.2     0.5    +      -       -      -
    408B  PHE*     3.5    34.3    -      -       +      -
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il