Contacts of the helix formed by residues 293 - 317 (chain U) in PDB entry 1FM6


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 293 (chain U).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292U  LEU*     1.3    99.3    -      -       +      +
    294U  LEU*     1.3    60.1    +      -       -      +
    295U  ASP*     3.3     3.4    -      -       +      +
    296U  ASP*     2.9    33.2    -      -       -      +
    297U  GLN*     2.9    25.3    +      -       -      +
    384U  SER*     3.9     9.2    -      -       -      +
    385U  ASN*     6.3     1.1    -      -       +      -
    388U  GLU*     4.4    11.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 294 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292U  LEU      3.6     0.8    +      -       -      -
    293U  PRO*     1.3    70.8    -      -       -      +
    295U  ASP*     1.3    68.6    +      -       -      +
    297U  GLN*     3.4    14.0    +      -       -      +
    298U  VAL*     3.4    18.3    +      -       +      +
    634V  HIS*     3.5    36.6    -      -       +      +
    637V  LEU*     4.2    24.9    -      -       +      +
    638V  GLN*     3.9    30.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 295 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293U  PRO*     3.3     3.4    -      -       +      +
    294U  LEU*     1.3    83.7    -      -       -      +
    296U  ASP*     1.3    69.2    +      -       -      +
    298U  VAL*     3.3     8.8    +      -       -      +
    299U  ILE*     3.3    29.9    +      -       +      +
    628V  GLU*     5.4     7.5    -      -       -      +
    629V  ARG*     5.6     1.7    +      -       -      -
    634V  HIS*     4.7    10.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 296 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292U  LEU*     4.4    12.1    -      -       +      +
    293U  PRO*     2.9    29.1    +      -       +      +
    294U  LEU      3.3     0.4    -      -       -      -
    295U  ASP*     1.3    77.4    -      -       -      +
    297U  GLN*     1.3    66.2    +      -       -      +
    299U  ILE*     3.3     3.9    +      -       -      +
    300U  LEU*     3.0    30.1    +      -       +      +
    382U  GLY      4.2     1.9    -      -       -      +
    383U  LEU*     3.4    22.2    -      -       +      +
    384U  SER*     2.6    50.8    +      -       -      -
    385U  ASN*     4.6     3.8    +      -       -      +
    389U  VAL*     5.6     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 297 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284U  LYS*     4.9     2.6    -      -       -      +
    289U  PHE*     3.6    32.2    -      -       +      -
    290U  SER*     3.1    32.2    +      -       -      +
    292U  LEU*     3.2    21.8    -      -       +      +
    293U  PRO      2.9    20.7    +      -       -      +
    294U  LEU*     3.4    16.0    -      -       -      +
    295U  ASP      3.2     0.2    -      -       -      -
    296U  ASP*     1.3    77.9    -      -       -      +
    298U  VAL*     1.3    61.7    +      -       -      +
    300U  LEU*     3.5     0.6    +      -       -      +
    301U  LEU*     3.2    23.2    +      -       -      +
    637V  LEU*     3.1    44.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 298 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294U  LEU*     3.4    10.1    +      -       +      +
    295U  ASP*     3.3    13.2    +      -       -      +
    296U  ASP      3.2     0.4    -      -       -      -
    297U  GLN*     1.3    80.0    -      -       -      +
    299U  ILE*     1.3    61.0    +      -       +      +
    301U  LEU      3.5     0.7    +      -       -      -
    302U  ARG*     2.9    30.2    +      -       -      +
    630V  HIS*     4.0    22.9    -      -       +      +
    633V  LEU*     3.2    29.2    -      -       +      +
    634V  HIS*     4.3    28.5    -      -       +      +
    637V  LEU*     3.5    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 299 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295U  ASP*     3.3    19.6    +      -       +      +
    296U  ASP*     3.3     6.3    +      -       -      +
    298U  VAL*     1.3    77.7    -      -       +      +
    300U  LEU*     1.3    61.6    +      -       -      +
    302U  ARG*     3.0     7.2    +      -       -      +
    303U  ALA*     2.8    31.5    +      -       +      +
    380U  SER*     3.5    28.9    -      -       -      -
    381U  LYS      3.8    12.1    -      -       -      +
    382U  GLY*     3.6    34.1    -      -       -      +
    383U  LEU*     3.9    12.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 300 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289U  PHE*     3.9    20.0    -      -       +      -
    292U  LEU*     4.3     9.0    -      -       +      -
    296U  ASP*     3.0    21.6    +      -       +      +
    297U  GLN      3.8     3.8    -      -       -      +
    299U  ILE*     1.3    76.8    -      -       -      +
    301U  LEU*     1.3    57.8    +      -       -      +
    303U  ALA*     3.4     3.5    +      -       -      +
    304U  GLY*     2.9    27.5    +      -       -      -
    375U  LEU*     3.6    36.0    -      -       +      +
    376U  PHE*     3.9    18.2    -      -       +      -
    377U  ASN*     3.6    25.4    -      -       +      +
    380U  SER*     4.8     2.9    -      -       -      +
    383U  LEU*     4.0    20.2    -      -       +      -
    389U  VAL*     4.1    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 301 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279U  LEU*     4.0    30.5    -      -       +      -
    280U  VAL*     4.4    14.1    -      -       +      -
    282U  TRP*     5.6     0.4    -      -       +      -
    283U  ALA*     4.0    23.1    -      -       +      -
    289U  PHE*     4.1     8.1    -      -       +      -
    297U  GLN      3.2    13.2    +      -       -      +
    298U  VAL      4.0     3.1    -      -       -      +
    300U  LEU*     1.3    77.7    -      -       -      +
    302U  ARG*     1.3    60.6    +      -       -      +
    304U  GLY      4.4     0.2    -      -       -      +
    305U  TRP*     3.0    32.7    +      -       -      +
    308U  LEU*     4.6     4.7    -      -       +      -
    375U  LEU*     4.0    17.0    -      -       +      -
    454U  MET*     3.7    13.3    -      -       +      +
    633V  LEU*     4.1    13.9    -      -       +      -
    637V  LEU*     4.1    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 302 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298U  VAL*     2.9    24.2    +      -       -      +
    299U  ILE*     3.6     7.2    -      -       -      +
    301U  LEU*     1.3    78.2    -      -       -      +
    303U  ALA*     1.3    61.9    +      -       -      +
    305U  TRP*     4.3    13.5    -      -       -      -
    306U  ASN*     5.5     0.3    -      -       -      +
    453U  GLU      3.5    18.2    +      -       -      -
    454U  MET*     3.7    27.5    -      -       +      +
    456U  GLU*     3.1    11.1    +      -       -      +
    457U  ALA*     2.8    67.4    -      -       +      +
    458U  PRO*     3.9     8.5    -      -       -      +
    630V  HIS*     3.1    52.3    +      -       +      +
    633V  LEU*     4.0     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 303 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299U  ILE*     2.8    15.0    +      -       +      +
    300U  LEU*     4.1     2.0    -      -       -      +
    302U  ARG*     1.3    78.4    -      -       -      +
    304U  GLY*     1.3    57.5    +      -       -      +
    306U  ASN*     4.1    10.3    -      -       -      +
    307U  GLU*     4.7     6.9    -      -       -      +
    377U  ASN*     5.6     8.1    +      -       +      +
    380U  SER*     3.3    28.9    -      -       -      +
    381U  LYS*     6.0     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 304 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300U  LEU      2.9    16.2    +      -       -      -
    303U  ALA*     1.3    79.5    -      -       -      +
    305U  TRP*     1.3    64.1    +      -       -      +
    306U  ASN*     3.2     4.0    +      -       -      -
    307U  GLU*     3.3     8.1    +      -       -      +
    308U  LEU*     3.0    36.5    +      -       -      +
    374U  VAL*     4.4    15.7    -      -       -      +
    377U  ASN*     6.5     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 305 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272U  ALA*     5.1     1.4    -      -       -      +
    276U  LEU*     2.9    35.2    -      -       +      +
    279U  LEU*     3.8    18.4    -      -       +      -
    301U  LEU      3.0    21.1    +      -       -      +
    302U  ARG      4.3    11.9    +      -       -      -
    303U  ALA      3.8     1.4    -      -       -      -
    304U  GLY*     1.3    74.4    -      -       -      +
    306U  ASN*     1.3    70.0    +      -       +      +
    308U  LEU*     3.4     2.1    +      -       -      +
    309U  LEU*     3.0    40.9    +      -       +      +
    433U  LEU*     3.3    34.8    -      -       +      -
    436U  LEU*     4.0     2.7    -      -       +      -
    451U  LEU*     3.6    23.9    -      -       +      +
    454U  MET*     3.6    40.2    -      -       +      -
    455U  LEU*     3.9    15.0    -      -       +      -
    457U  ALA*     5.3     2.5    -      -       +      -
    502U  9CR      3.9    22.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 306 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302U  ARG      5.5     0.2    -      -       -      +
    303U  ALA      4.1    14.9    -      -       -      +
    305U  TRP*     1.3   104.1    +      -       +      +
    307U  GLU*     1.3    65.0    +      -       -      +
    309U  LEU*     3.3     2.7    +      -       -      +
    310U  ILE*     2.5    38.1    +      -       +      +
    429U  GLY*     2.8    43.4    +      -       -      -
    430U  LEU*     6.0     0.4    -      -       -      +
    432U  CYS*     5.7     1.1    -      -       +      -
    433U  LEU*     3.4    29.4    -      -       +      +
    502U  9CR      4.3    12.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 307 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303U  ALA      4.7     7.7    -      -       -      +
    304U  GLY*     3.3     6.3    +      -       -      +
    306U  ASN*     1.3    86.6    +      -       -      +
    308U  LEU*     1.3    63.9    +      -       -      +
    310U  ILE*     3.5     7.8    -      -       -      +
    311U  ALA*     3.0    26.7    +      -       -      +
    374U  VAL*     3.9    20.0    -      -       +      +
    422U  LEU      5.0     0.9    -      -       -      +
    425U  LEU*     3.6    33.0    -      -       +      +
    426U  ARG*     2.8    61.6    +      -       -      +
    429U  GLY*     4.4     8.1    -      -       -      -
    430U  LEU*     5.8     0.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 308 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279U  LEU*     4.0    22.9    -      -       +      -
    282U  TRP*     4.0     8.7    -      -       +      -
    301U  LEU*     4.6     5.2    -      -       +      -
    304U  GLY*     3.0    35.5    +      -       -      +
    305U  TRP*     3.6     6.3    -      -       -      +
    307U  GLU*     1.3    78.4    -      -       -      +
    309U  LEU*     1.3    60.2    +      -       -      +
    311U  ALA*     3.6     2.5    +      -       +      +
    312U  SER*     3.3     6.4    +      -       -      -
    371U  ARG*     2.9    80.2    +      -       +      +
    374U  VAL*     3.8    12.1    -      -       +      -
    375U  LEU*     4.3    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 309 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272U  ALA*     3.6    23.6    -      -       -      +
    275U  GLN*     3.9    29.6    -      -       +      -
    276U  LEU*     3.4    28.9    -      -       +      -
    279U  LEU*     4.0    25.1    -      -       +      -
    305U  TRP*     3.0    29.9    +      -       +      +
    306U  ASN      4.0     2.2    -      -       -      +
    308U  LEU*     1.3    73.5    -      -       -      +
    310U  ILE*     1.3    65.7    +      -       -      +
    311U  ALA      3.1     1.8    -      -       -      -
    312U  SER*     3.2     5.8    +      -       -      +
    313U  PHE*     3.2    25.0    +      -       -      +
    371U  ARG*     4.2    11.2    -      -       -      +
    502U  9CR      4.1    17.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 310 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306U  ASN*     2.5    38.4    +      -       +      +
    307U  GLU*     3.5     8.7    -      -       -      -
    309U  LEU*     1.3    75.2    -      -       -      +
    311U  ALA*     1.3    58.5    +      -       -      +
    313U  PHE*     3.2    31.5    -      -       +      -
    314U  SER*     2.7    37.5    +      -       -      +
    349U  VAL*     4.6     6.3    -      -       +      -
    353U  LEU*     3.3    25.6    -      -       +      -
    425U  LEU*     2.9    28.0    -      -       +      +
    428U  ILE*     4.6     7.9    -      -       +      -
    429U  GLY*     4.9    11.4    -      -       -      -
    432U  CYS*     5.7     6.5    -      -       +      -
    502U  9CR      5.0     6.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 311 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307U  GLU      3.0    18.0    +      -       -      +
    308U  LEU*     3.7     6.7    -      -       -      +
    309U  LEU      3.1     0.2    -      -       -      -
    310U  ILE*     1.3    83.8    -      -       -      +
    312U  SER*     1.3    56.2    +      -       -      +
    314U  SER*     3.8     4.4    -      -       -      -
    315U  HIS*     3.1    28.1    +      -       -      +
    357U  MET*     3.9     8.9    -      -       +      +
    367U  LEU*     3.7    11.6    -      -       +      +
    371U  ARG*     4.2    18.6    -      -       +      -
    425U  LEU*     4.1    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 312 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    239U  GLU*     4.2     3.2    +      -       -      -
    275U  GLN*     5.9     3.8    -      -       -      -
    308U  LEU      3.4     1.3    +      -       -      -
    309U  LEU*     3.2    11.9    +      -       -      -
    311U  ALA*     1.3    78.9    -      -       -      +
    313U  PHE*     1.3    59.6    +      -       -      +
    315U  HIS*     4.1     3.5    -      -       -      +
    316U  ARG*     3.1    39.2    +      -       -      +
    367U  LEU*     4.9     6.2    -      -       -      +
    371U  ARG*     2.7    44.9    +      -       -      +
    502U  9CR      5.6     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 313 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309U  LEU      3.2    22.3    +      -       -      -
    310U  ILE*     3.2    31.6    -      -       +      -
    312U  SER*     1.3    75.4    -      -       -      +
    314U  SER*     1.3    63.9    +      -       -      +
    316U  ARG*     3.6    25.1    -      -       -      +
    317U  SER*     2.7    37.8    +      -       -      -
    324U  ILE*     3.9    24.2    -      -       +      -
    325U  LEU      3.9     6.0    -      -       -      +
    349U  VAL*     3.7    26.5    -      -       +      -
    502U  9CR      3.4    70.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 314 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310U  ILE*     2.7    31.4    +      -       -      +
    311U  ALA*     3.8     4.0    -      -       -      -
    313U  PHE*     1.3    89.1    -      -       -      +
    315U  HIS*     1.3    64.9    +      -       -      +
    317U  SER*     3.2     8.5    +      -       -      -
    318U  ILE*     3.6     6.6    +      -       -      +
    349U  VAL*     3.8     9.9    -      -       -      +
    353U  LEU*     3.9     8.5    -      -       -      +
    354U  VAL*     3.5    33.4    -      -       -      +
    357U  MET*     3.9    18.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 315 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    311U  ALA      3.1    15.6    +      -       -      +
    312U  SER      4.1     1.8    -      -       -      +
    314U  SER*     1.3    77.0    -      -       -      +
    316U  ARG*     1.3    68.9    +      -       -      +
    318U  ILE*     2.9    39.7    +      -       +      +
    357U  MET*     3.5    12.5    -      -       +      -
    362U  MET*     3.1    49.2    +      -       +      +
    363U  ASP*     3.8    10.4    +      -       -      -
    364U  LYS*     4.5    25.5    +      -       +      -
    367U  LEU*     3.7    33.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 316 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243U  GLU*     5.8     3.6    -      -       -      +
    244U  PRO*     4.9    23.1    -      -       +      +
    275U  GLN*     4.5     8.5    +      -       -      -
    312U  SER*     3.1    32.0    +      -       -      +
    313U  PHE*     3.6     7.7    -      -       -      +
    315U  HIS*     1.3    81.3    +      -       -      +
    317U  SER*     1.3    58.3    +      -       -      +
    318U  ILE*     3.0     8.0    +      -       -      +
    319U  ALA*     3.5    11.8    +      -       -      +
    325U  LEU*     2.6    62.9    +      -       +      +
    326U  LEU      4.6     3.8    -      -       -      -
    327U  ALA*     3.0    25.7    -      -       -      +
    502U  9CR      2.8    31.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 317 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313U  PHE      2.7    23.4    +      -       -      -
    314U  SER      3.5     8.1    -      -       -      -
    315U  HIS      3.1     1.0    -      -       -      -
    316U  ARG*     1.3    74.2    -      -       -      +
    318U  ILE*     1.3    62.6    +      -       -      +
    319U  ALA      3.2     1.5    +      -       -      +
    320U  VAL*     3.0    21.6    +      -       -      +
    323U  GLY      3.8     5.7    -      -       -      +
    324U  ILE*     2.9    18.7    -      -       -      +
    325U  LEU*     2.7    34.8    +      -       -      +
    354U  VAL*     3.6    18.2    -      -       -      +
----------------------------------------------------------
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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