Contacts of the helix formed by residues 296 - 319 (chain E) in PDB entry 5I4V


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 GLY 296 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294E  GLN      4.1     0.4    +      -       -      -
    295E  LEU*     1.3    77.9    -      -       -      +
    297E  ARG*     1.3    61.3    +      -       -      -
    298E  GLU      3.2     2.9    -      -       -      -
    299E  ASP*     3.3    10.8    +      -       -      +
    300E  GLN*     3.1    23.7    +      -       -      +
    388E  GLU*     4.7    10.6    +      -       -      -
    391E  ARG*     4.6     3.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 297 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293E  LEU*     4.6    12.9    -      -       -      +
    295E  LEU      3.8     1.0    +      -       -      -
    296E  GLY*     1.3    70.3    -      -       -      -
    298E  GLU*     1.3    64.9    +      -       +      +
    300E  GLN*     3.6    29.9    +      -       -      +
    301E  ILE*     3.2    34.4    +      -       +      +
    472E  HIS*     3.6    41.5    -      -       -      +
    475E  LEU*     3.6    38.5    +      -       +      +
    476E  GLN*     4.4     8.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 298 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296E  GLY*     3.2     0.8    -      -       -      -
    297E  ARG*     1.3    80.7    -      -       +      +
    299E  ASP*     1.3    58.4    +      -       -      +
    301E  ILE*     3.5    13.5    +      -       +      +
    302E  ALA*     3.0    25.6    +      -       -      +
    385E  ASN      4.9     2.0    -      -       -      +
    387E  GLN*     3.1    31.8    +      -       -      +
    472E  HIS*     6.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 299 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295E  LEU*     4.7    16.2    -      -       +      +
    296E  GLY*     3.3    13.7    +      -       -      +
    298E  GLU*     1.3    76.9    -      -       -      +
    300E  GLN*     1.3    60.2    +      -       -      +
    301E  ILE      3.2     1.6    -      -       -      -
    302E  ALA*     3.6     4.8    -      -       -      +
    303E  LEU*     2.8    40.8    +      -       +      +
    385E  ASN      3.8     5.5    -      -       -      +
    386E  VAL*     3.8    12.0    -      -       +      +
    387E  GLN*     3.0    32.6    +      -       -      +
    388E  GLU*     3.0    37.4    +      -       -      +
    392E  VAL*     4.9     2.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 300 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292E  PHE*     3.1    52.8    +      -       +      +
    293E  LEU*     3.5    20.3    +      -       -      +
    295E  LEU*     3.1    25.6    +      -       +      +
    296E  GLY      3.1    16.0    +      -       -      +
    297E  ARG*     3.6    37.5    +      -       -      +
    299E  ASP*     1.3    75.6    -      -       -      +
    301E  ILE*     1.3    62.3    +      -       -      +
    303E  LEU*     3.9     1.4    -      -       -      +
    304E  LEU*     3.1    32.3    +      -       -      +
    475E  LEU*     3.6    17.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 301 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    297E  ARG*     3.2    21.9    +      -       +      +
    298E  GLU*     3.6    15.0    -      -       +      +
    299E  ASP      3.2     0.6    -      -       -      -
    300E  GLN*     1.3    77.1    -      -       -      +
    302E  ALA*     1.3    57.1    +      -       -      +
    304E  LEU*     3.3     2.1    +      -       -      +
    305E  LYS*     2.9    45.0    +      -       +      +
    469E  LYS      5.9     1.8    -      -       -      +
    471E  LEU*     4.1    25.4    -      -       +      +
    472E  HIS*     4.0    34.8    -      -       +      +
    475E  LEU*     3.9    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 302 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298E  GLU      3.0    18.3    +      -       -      +
    299E  ASP*     3.1     6.7    +      -       -      +
    301E  ILE*     1.3    79.9    -      -       -      +
    303E  LEU*     1.3    63.5    +      -       -      +
    305E  LYS*     3.6     9.3    +      -       -      +
    306E  ALA*     3.5    21.1    +      -       -      +
    383E  ARG*     4.3     4.5    -      -       -      +
    384E  PRO*     3.6    23.8    -      -       -      +
    385E  ASN*     3.9    19.5    -      -       +      +
    386E  VAL*     4.3     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 303 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292E  PHE*     4.5     6.1    -      -       +      -
    295E  LEU*     3.8    28.7    -      -       +      -
    299E  ASP*     2.8    24.4    +      -       +      +
    300E  GLN      3.9     3.6    -      -       -      +
    302E  ALA*     1.3    73.9    -      -       -      +
    304E  LEU*     1.3    60.1    +      -       -      +
    306E  ALA*     3.7     2.3    +      -       -      +
    307E  SER*     3.0    28.3    +      -       -      -
    378E  ILE*     3.4    33.3    -      -       +      +
    379E  PHE*     4.4     7.4    -      -       +      -
    380E  SER      3.4    26.2    -      -       -      +
    383E  ARG*     4.0    11.2    +      -       +      -
    386E  VAL*     4.0    14.6    -      -       +      -
    392E  VAL*     4.3    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 304 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282E  ILE*     3.8    30.1    -      -       +      +
    283E  VAL*     4.4    16.8    -      -       +      -
    286E  ALA*     4.0    18.8    -      -       +      -
    292E  PHE*     3.6    22.4    -      -       +      -
    300E  GLN      3.1    20.3    +      -       -      +
    301E  ILE*     3.9     3.1    -      -       -      +
    303E  LEU*     1.3    75.5    -      -       -      +
    305E  LYS*     1.3    64.9    +      -       -      +
    307E  SER*     3.8     6.1    -      -       -      +
    308E  THR*     2.8    34.1    +      -       -      +
    378E  ILE*     5.3     6.3    -      -       +      -
    456E  ILE*     4.7     1.3    -      -       +      -
    471E  LEU*     4.3    13.0    -      -       +      -
    475E  LEU*     4.2    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 305 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    301E  ILE*     2.9    37.3    +      -       +      +
    302E  ALA*     3.8     8.7    -      -       -      +
    304E  LEU*     1.3    77.0    -      -       -      +
    306E  ALA*     1.3    62.7    +      -       +      +
    308E  THR*     4.0     4.9    +      -       -      -
    309E  ILE*     4.9     1.4    +      -       -      +
    385E  ASN*     5.6     7.9    -      -       -      +
    455E  GLU*     3.4    15.3    +      -       +      +
    456E  ILE*     3.8    43.6    -      -       +      +
    457E  TRP*     4.6     7.1    +      -       -      -
    458E  ASP*     3.0    31.4    +      -       -      -
    471E  LEU*     4.5     5.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 306 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302E  ALA      3.5     9.2    +      -       -      +
    303E  LEU      4.1     0.4    -      -       -      +
    304E  LEU      3.2     0.2    -      -       -      -
    305E  LYS*     1.3    80.5    -      -       +      +
    307E  SER*     1.3    61.1    +      -       -      +
    308E  THR      3.8     0.3    +      -       -      -
    309E  ILE*     4.0    13.7    -      -       -      +
    310E  GLU*     3.9    13.2    -      -       -      +
    383E  ARG*     3.4    44.5    +      -       +      +
    384E  PRO*     4.6     9.2    -      -       +      -
    432E  SER*     4.6     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 307 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303E  LEU      3.0    18.4    +      -       -      -
    304E  LEU*     3.7     7.8    +      -       -      +
    306E  ALA*     1.3    77.3    -      -       -      +
    308E  THR*     1.3    68.0    +      -       -      +
    309E  ILE      3.3     2.7    -      -       -      -
    310E  GLU*     3.0     4.9    +      -       -      +
    311E  ILE*     2.8    41.1    +      -       -      +
    377E  ASN*     3.4    24.7    -      -       -      -
    378E  ILE*     4.1     8.9    -      -       -      +
    383E  ARG*     3.8    12.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 308 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279E  VAL*     4.1    15.4    -      -       +      +
    282E  ILE*     3.6    26.2    -      -       +      +
    304E  LEU*     2.8    24.9    +      -       -      +
    305E  LYS      4.2     2.7    -      -       -      -
    306E  ALA      3.5     0.8    -      -       -      -
    307E  SER*     1.3    78.5    +      -       -      +
    309E  ILE*     1.3    59.3    +      -       -      +
    311E  ILE*     3.3     1.1    +      -       -      -
    312E  MET*     2.8    50.2    +      -       -      +
    456E  ILE*     3.1    29.5    -      -       +      +
    457E  TRP*     4.4     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 309 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305E  LYS      4.9     1.3    +      -       -      +
    306E  ALA      4.0    11.9    -      -       -      +
    308E  THR*     1.3    81.5    -      -       -      +
    310E  GLU*     1.3    61.4    +      -       +      +
    312E  MET*     3.3    27.5    +      -       +      +
    313E  LEU*     2.9    42.5    +      -       +      +
    349E  PHE*     4.6     8.5    -      -       +      -
    432E  SER*     3.7    31.4    -      -       -      +
    435E  HIS*     3.7    47.6    -      -       +      +
    457E  TRP*     4.1    15.1    -      -       +      +
    501E  67S      5.0     2.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 310 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306E  ALA      3.9     7.1    -      -       -      +
    307E  SER      3.0     6.8    +      -       -      +
    309E  ILE*     1.3    88.1    -      -       +      +
    311E  ILE*     1.3    57.0    +      -       -      +
    313E  LEU*     3.1     7.0    +      -       -      +
    314E  LEU*     3.0    31.1    +      -       -      +
    377E  ASN*     2.7    38.4    +      -       -      +
    383E  ARG*     2.8    36.8    +      -       -      -
    425E  LEU      4.9     0.7    -      -       -      +
    428E  LEU*     3.8    42.7    -      -       +      +
    429E  ARG*     3.4    16.6    +      -       -      -
    432E  SER*     4.1     7.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 311 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282E  ILE*     3.8    37.5    -      -       +      -
    285E  PHE*     6.3     0.2    -      -       +      -
    307E  SER*     2.8    41.7    +      -       -      +
    308E  THR      3.8     2.7    -      -       -      +
    310E  GLU*     1.3    68.5    -      -       -      +
    312E  MET*     1.3    60.9    +      -       -      +
    314E  LEU*     3.0     8.9    +      -       +      +
    315E  GLU*     2.8    41.9    +      -       +      +
    374E  ILE*     4.1    30.5    -      -       +      +
    377E  ASN*     4.1    10.5    -      -       +      +
    378E  ILE*     3.7    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 312 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275E  ALA*     4.7     4.0    -      -       +      +
    278E  SER*     3.1    31.4    -      -       -      +
    279E  VAL*     4.7     6.5    -      -       -      -
    282E  ILE*     4.2     3.6    -      -       +      +
    308E  THR*     2.8    42.3    +      -       -      +
    309E  ILE*     3.3    15.9    -      -       +      +
    311E  ILE*     1.3    74.0    -      -       -      +
    313E  LEU*     1.3    54.4    +      -       +      +
    315E  GLU*     3.5     4.7    +      -       -      +
    316E  THR*     2.6    38.1    +      -       -      -
    457E  TRP*     3.7    30.3    -      -       +      -
    501E  67S      3.3    47.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 313 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309E  ILE*     2.9    29.3    +      -       +      +
    310E  GLU*     3.4     8.3    -      -       -      +
    311E  ILE      3.1     0.4    -      -       -      -
    312E  MET*     1.3    75.4    -      -       -      +
    314E  LEU*     1.3    60.4    +      -       -      +
    316E  THR*     3.4     5.6    -      -       -      -
    317E  ALA*     2.9    28.9    +      -       -      +
    349E  PHE*     4.9     7.0    -      -       +      -
    353E  ILE*     3.8    39.3    -      -       +      -
    356E  PHE*     3.8    11.6    -      -       +      -
    357E  SER*     5.4     0.2    +      -       -      -
    428E  LEU*     4.0    12.1    -      -       +      -
    431E  LEU*     3.4    46.0    -      -       +      +
    432E  SER      4.9     0.7    -      -       -      +
    501E  67S      4.8    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 314 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310E  GLU      3.0    14.9    +      -       -      +
    311E  ILE*     3.0    10.7    +      -       -      +
    313E  LEU*     1.3    75.5    -      -       -      +
    315E  GLU*     1.3    63.7    +      -       -      +
    316E  THR      3.2     0.2    +      -       -      -
    317E  ALA*     3.2     3.9    +      -       -      +
    318E  ARG*     3.0    23.4    +      -       -      +
    356E  PHE*     4.1    21.5    -      -       +      -
    360E  MET*     4.3    15.3    -      -       -      -
    370E  TYR*     3.8    20.9    -      -       +      +
    373E  LEU*     4.5    24.9    -      -       +      +
    374E  ILE*     4.0    34.3    -      -       +      -
    377E  ASN*     5.0     4.9    -      -       +      +
    424E  LYS*     5.7     0.9    -      -       +      -
    425E  LEU*     5.6     0.2    -      -       +      -
    428E  LEU*     4.0    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 315 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235E  GLN*     3.3    16.4    +      -       -      -
    239E  ASN*     4.4     2.1    +      -       -      +
    278E  SER*     6.0     0.4    -      -       -      +
    281E  GLU*     3.9    10.9    -      -       -      +
    282E  ILE*     5.9     2.0    -      -       +      -
    311E  ILE*     2.8    34.9    +      -       +      +
    312E  MET*     3.8     4.5    -      -       -      +
    314E  LEU*     1.3    73.4    -      -       -      +
    316E  THR*     1.3    62.9    +      -       -      +
    318E  ARG*     2.8    39.6    +      -       -      +
    319E  ARG*     2.7    55.7    +      -       -      +
    370E  TYR*     5.1     0.2    -      -       -      -
    374E  ILE*     3.5     8.1    -      -       +      +
    501E  67S      4.1    19.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 316 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312E  MET      2.6    25.8    +      -       -      -
    313E  LEU*     3.4     9.4    -      -       -      -
    314E  LEU      3.1     0.2    -      -       -      -
    315E  GLU*     1.3    75.1    -      -       -      +
    317E  ALA*     1.3    66.6    +      -       -      +
    319E  ARG*     2.9    19.2    +      -       -      +
    320E  TYR*     3.4     7.6    +      -       -      +
    327E  ILE*     3.6    36.2    -      -       +      +
    329E  PHE*     4.2     8.3    -      -       +      -
    353E  ILE*     4.0    19.1    -      -       +      -
    357E  SER*     4.6     1.8    -      -       -      +
    501E  67S      3.5    30.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 317 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313E  LEU      2.9    12.7    +      -       -      +
    314E  LEU      3.6     7.9    -      -       -      +
    316E  THR*     1.3    76.1    -      -       -      +
    318E  ARG*     1.3    62.9    +      -       -      +
    320E  TYR*     3.0    21.1    +      -       -      +
    356E  PHE*     4.1     8.5    -      -       +      -
    357E  SER*     3.5    37.2    +      -       -      +
    360E  MET*     3.9    23.3    -      -       +      +
    361E  ARG*     4.9     3.6    +      -       -      +
    370E  TYR*     4.2     3.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 318 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  GLU*     4.2    28.0    -      -       -      +
    235E  GLN*     3.0    33.4    +      -       -      +
    314E  LEU      3.0    12.1    +      -       -      +
    315E  GLU*     2.8    44.7    +      -       -      +
    317E  ALA*     1.3    78.2    -      -       -      +
    319E  ARG*     1.3    69.7    +      -       -      +
    320E  TYR      3.3     4.1    +      -       -      +
    361E  ARG*     4.9     4.4    +      -       -      +
    367E  ASP*     3.3    46.0    +      -       -      +
    370E  TYR*     3.6    47.0    +      -       +      +
    374E  ILE*     4.2     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 319 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  GLU*     3.6    28.8    +      -       -      +
    239E  ASN*     3.3    29.3    +      -       -      +
    243E  PHE*     5.4     5.9    -      -       -      -
    281E  GLU*     4.2     3.8    +      -       -      -
    315E  GLU*     2.7    50.1    +      -       -      +
    316E  THR      2.9    10.9    +      -       -      +
    318E  ARG*     1.3    84.1    -      -       -      +
    320E  TYR*     1.3    60.3    +      -       -      +
    321E  ASN*     3.8     1.6    +      -       -      +
    326E  CYS      3.8     0.3    -      -       -      +
    327E  ILE*     3.4     5.4    -      -       +      -
    328E  THR*     3.0    52.3    +      -       -      +
    329E  PHE*     4.5     9.0    -      -       -      -
    330E  LEU*     4.9     6.9    +      -       -      +
    501E  67S      3.9    25.0    +      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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