Contacts of the helix formed by residues 270 - 296 (chain E) in PDB entry 6NR8


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 SER 270 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257B  ARG*     3.6     9.2    -      -       -      +
    266B  GLU*     4.9     7.4    +      -       -      -
    268E  VAL*     3.8    10.6    -      -       -      +
    269E  THR*     1.3    85.5    +      -       -      +
    271E  VAL*     1.3    65.7    +      -       -      +
    272E  GLU*     3.9    16.4    -      -       -      -
    273E  ASP*     3.0    35.3    +      -       -      +
    274E  TYR      3.4     4.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 271 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253B  GLY*     3.4    31.4    -      -       -      +
    254B  SER*     3.3    27.4    -      -       -      +
    255B  ARG      5.5     0.2    -      -       -      +
    257B  ARG*     3.4    14.1    -      -       -      +
    266B  GLU*     3.4    20.9    +      -       +      +
    270E  SER*     1.3    72.8    -      -       -      +
    272E  GLU*     1.3    68.4    +      -       -      +
    274E  TYR*     3.0    12.1    +      -       +      +
    275E  LYS*     2.9    40.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 272 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    266B  GLU*     5.4     2.8    -      -       -      +
    270E  SER*     3.9    10.6    -      -       -      -
    271E  VAL*     1.3    85.4    +      -       -      +
    273E  ASP*     1.3    61.6    +      -       -      +
    275E  LYS*     3.3    17.2    +      -       +      +
    276E  ALA*     3.0    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 273 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268E  VAL*     5.0     4.3    -      -       +      -
    269E  THR*     3.3    19.6    -      -       -      +
    270E  SER*     3.0    38.2    +      -       -      +
    272E  GLU*     1.3    80.1    -      -       -      +
    274E  TYR*     1.3    55.7    +      -       -      +
    276E  ALA*     3.5     6.5    +      -       -      +
    277E  LEU*     2.9    26.1    +      -       -      +
    280E  TYR*     5.3     2.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 274 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251B  ILE*     4.1    19.4    -      -       +      +
    253B  GLY      5.4     5.6    -      -       -      -
    255B  ARG*     3.3    58.2    +      -       +      +
    268E  VAL*     4.8    10.7    -      -       +      +
    270E  SER      3.4     5.8    +      -       -      +
    271E  VAL*     3.0    15.5    +      -       +      +
    273E  ASP*     1.3    75.5    -      -       -      +
    275E  LYS*     1.3    72.9    +      -       +      +
    277E  LEU*     3.2    25.1    +      -       +      +
    278E  GLN*     3.2    47.7    +      -       +      +
    281E  GLU*     6.2     0.2    -      -       -      -
    309E  GLU*     4.4    11.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 275 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251B  ILE*     5.4    10.1    -      -       -      -
    252B  PHE*     4.2    22.1    +      -       -      +
    253B  GLY*     5.0     2.2    -      -       -      -
    271E  VAL*     2.9    34.0    +      -       +      +
    272E  GLU*     3.3    20.9    +      -       +      +
    274E  TYR*     1.3    86.0    -      -       +      +
    276E  ALA*     1.3    60.2    +      -       -      +
    278E  GLN*     3.8    18.5    +      -       -      +
    279E  LYS*     3.4    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 276 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272E  GLU      3.0    16.2    +      -       -      +
    273E  ASP*     3.9     6.3    -      -       -      +
    274E  TYR      3.3     0.2    -      -       -      -
    275E  LYS*     1.3    75.8    -      -       -      +
    277E  LEU*     1.3    54.2    +      -       -      +
    278E  GLN      3.3     0.2    -      -       -      -
    279E  LYS*     3.1    12.8    +      -       +      +
    280E  TYR*     2.7    66.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 277 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255B  ARG*     3.9    12.3    -      -       -      +
    268E  VAL*     4.8     7.0    -      -       +      -
    273E  ASP      2.9    17.6    +      -       -      +
    274E  TYR*     3.2    33.3    +      -       +      +
    276E  ALA*     1.3    75.6    -      -       -      +
    278E  GLN*     1.3    59.7    +      -       -      +
    280E  TYR*     3.6    18.2    -      -       +      +
    281E  GLU*     2.9    40.6    +      -       +      +
    257G  VAL*     6.1     3.6    -      -       +      -
    258G  HIS*     3.4    30.3    -      -       -      +
    259G  THR*     4.4     9.9    -      -       -      +
    260G  VAL*     6.0     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 278 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251B  ILE*     4.3    12.5    -      -       -      +
    274E  TYR*     3.2    50.5    +      -       +      +
    275E  LYS*     4.1    17.1    -      -       -      +
    277E  LEU*     1.3    77.1    -      -       -      +
    279E  LYS*     1.3    61.1    +      -       +      +
    281E  GLU*     3.5    20.6    -      -       -      +
    282E  LYS*     3.3    25.1    +      -       -      +
    309E  GLU*     5.6     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 279 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275E  LYS*     3.4    25.1    +      -       -      +
    276E  ALA*     3.1    13.7    +      -       +      +
    278E  GLN*     1.3    78.1    +      -       +      +
    280E  TYR*     1.3    69.4    +      -       +      +
    282E  LYS*     3.8     6.9    +      -       -      +
    283E  GLU*     3.7    17.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 280 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273E  ASP      5.3     2.0    -      -       -      -
    276E  ALA*     2.7    44.6    +      -       +      +
    277E  LEU*     3.2    21.1    +      -       +      +
    279E  LYS*     1.3    82.1    -      -       +      +
    281E  GLU*     1.3    63.2    -      -       -      +
    283E  GLU*     3.3    13.4    +      -       -      +
    284E  LYS*     3.2    26.1    +      -       +      +
    259G  THR*     6.0     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 281 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274E  TYR*     6.2     0.2    -      -       -      -
    277E  LEU*     2.9    28.6    +      -       +      +
    278E  GLN*     3.5    23.6    -      -       -      +
    280E  TYR*     1.3    74.7    -      -       -      +
    282E  LYS*     1.3    57.0    +      -       -      +
    284E  LYS*     3.1    11.4    +      -       -      +
    285E  PHE*     2.7    62.7    +      -       +      -
    309E  GLU*     5.7     0.7    -      -       -      +
    313E  LEU*     4.8     7.8    -      -       -      +
    260G  VAL*     3.7    30.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 282 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278E  GLN      3.3    19.0    +      -       -      +
    279E  LYS*     4.0     8.5    -      -       -      +
    280E  TYR      3.2     0.6    -      -       -      -
    281E  GLU*     1.3    75.3    -      -       -      +
    283E  GLU*     1.3    64.6    +      -       -      +
    285E  PHE*     3.4     9.3    +      -       -      +
    286E  GLU*     3.2    26.5    +      -       +      +
    313E  LEU*     3.4    40.7    +      -       -      +
    316E  GLN*     4.8     5.1    +      -       -      -
    317E  ASN*     3.1    40.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 283 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279E  LYS      3.7     9.1    +      -       -      +
    280E  TYR*     3.3    13.5    +      -       -      +
    281E  GLU      3.3     0.2    -      -       -      -
    282E  LYS*     1.3    77.9    -      -       -      +
    284E  LYS*     1.3    64.0    +      -       -      +
    286E  GLU*     3.2     9.9    +      -       +      +
    287E  GLU*     3.0    43.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 284 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280E  TYR*     3.2    18.3    +      -       +      +
    281E  GLU*     3.1    10.4    +      -       -      +
    283E  GLU*     1.3    82.9    -      -       -      +
    285E  PHE*     1.3    66.6    +      -       +      +
    287E  GLU*     2.9    42.1    +      -       -      +
    288E  MET*     3.3    29.5    +      -       +      +
    259G  THR*     4.7     6.7    -      -       -      +
    260G  VAL*     3.7    26.5    -      -       +      -
    261G  GLU*     3.7    29.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 285 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257E  PRO*     4.3    24.5    -      -       +      -
    281E  GLU*     2.7    51.9    +      -       +      +
    282E  LYS*     3.5    27.4    -      -       -      +
    283E  GLU      3.2     0.4    -      -       -      -
    284E  LYS*     1.3    76.4    -      -       +      +
    286E  GLU*     1.3    62.8    +      -       -      +
    288E  MET*     3.4    12.9    +      -       -      +
    289E  ILE*     3.2    26.8    +      -       -      +
    310E  ALA*     3.6    21.3    -      -       +      -
    313E  LEU*     3.8    26.0    -      -       +      -
    314E  LEU*     3.6    27.9    -      -       +      +
    317E  ASN*     3.9    13.7    -      -       -      +
    260G  VAL*     5.0     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 286 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282E  LYS*     3.2    16.9    +      -       +      +
    283E  GLU*     3.2    11.0    +      -       +      +
    285E  PHE*     1.3    74.7    -      -       -      +
    287E  GLU*     1.3    60.6    +      -       +      +
    289E  ILE*     3.2    20.3    +      -       -      +
    290E  GLN*     2.8    42.4    +      -       +      +
    317E  ASN*     3.0    37.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 287 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283E  GLU*     3.0    29.2    +      -       +      +
    284E  LYS*     2.9    47.8    +      -       -      +
    285E  PHE      3.3     0.2    -      -       -      -
    286E  GLU*     1.3    76.1    -      -       +      +
    288E  MET*     1.3    65.1    +      -       +      +
    290E  GLN*     4.0     5.0    -      -       -      +
    291E  GLN*     3.1    32.1    +      -       +      +
    345E  PHE*     4.6     6.1    -      -       +      -
    261G  GLU*     4.4     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 288 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254E  PRO*     3.8     7.6    -      -       +      +
    255E  PHE*     3.2    53.7    -      -       +      +
    256E  GLU*     4.4     4.0    -      -       -      -
    257E  PRO*     4.8    10.8    -      -       +      -
    284E  LYS*     3.3    17.3    +      -       +      +
    285E  PHE*     3.7    13.0    -      -       +      +
    286E  GLU      3.3     0.2    -      -       -      -
    287E  GLU*     1.3    75.9    -      -       +      +
    289E  ILE*     1.3    62.2    +      -       -      +
    291E  GLN*     4.4     0.3    -      -       -      +
    292E  ILE*     3.3    18.5    +      -       -      +
    345E  PHE*     3.8    26.0    -      -       +      -
    260G  VAL*     4.6    23.6    -      -       +      +
    261G  GLU*     4.7     7.0    -      -       -      +
    264G  GLN*     3.4    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 289 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255E  PHE*     3.6    24.7    -      -       +      -
    285E  PHE      3.2    17.8    +      -       -      +
    286E  GLU*     3.3    21.1    -      -       -      +
    287E  GLU      3.2     0.2    -      -       -      -
    288E  MET*     1.3    77.4    -      -       -      +
    290E  GLN*     1.3    76.2    +      -       -      +
    292E  ILE*     3.2     2.3    +      -       -      +
    293E  LYS*     2.8    43.5    +      -       -      +
    314E  LEU*     3.8     7.0    -      -       +      -
    317E  ASN*     3.3    43.1    -      -       +      +
    318E  ASN      5.5     0.4    -      -       -      +
    319E  LEU*     3.7    19.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 290 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286E  GLU*     2.8    32.0    +      -       +      +
    287E  GLU*     3.5     4.9    +      -       -      +
    289E  ILE*     1.3    80.6    -      -       +      +
    291E  GLN*     1.3    62.3    +      -       -      +
    293E  LYS*     3.2    37.7    +      -       -      +
    294E  GLU*     3.2    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 291 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287E  GLU*     3.1    19.8    +      -       +      +
    288E  MET      4.4     2.7    -      -       -      +
    290E  GLN*     1.3    79.6    -      -       -      +
    292E  ILE*     1.3    66.6    +      -       +      +
    294E  GLU*     3.3    23.0    +      -       -      +
    295E  THR*     3.1    18.4    +      -       -      -
    345E  PHE*     4.1    28.1    +      -       +      +
    348E  LEU*     3.3    31.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 292 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249E  ALA*     4.2    13.2    -      -       +      -
    251E  LEU*     4.2    27.8    -      -       +      -
    253E  CYS*     5.0     6.7    -      -       -      -
    255E  PHE*     4.0    18.2    -      -       +      -
    288E  MET*     3.3    20.1    +      -       -      +
    289E  ILE      3.2     2.3    +      -       -      +
    291E  GLN*     1.3    79.7    -      -       +      +
    293E  LYS*     1.3    60.3    +      -       -      +
    295E  THR*     3.0    18.5    +      -       -      -
    296E  GLY      2.8    20.7    +      -       -      +
    297E  ALA*     4.0    20.0    -      -       +      +
    298E  ASN*     5.6     1.1    -      -       -      -
    300E  ALA*     5.1     4.3    -      -       +      -
    319E  LEU*     5.1     5.8    -      -       +      -
    345E  PHE*     5.5     8.5    -      -       +      -
    348E  LEU*     3.8    22.2    -      -       +      -
    353E  LEU*     5.5     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 293 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289E  ILE*     2.8    26.8    +      -       +      +
    290E  GLN*     3.2    31.7    +      -       -      +
    292E  ILE*     1.3    78.4    -      -       -      +
    294E  GLU*     1.3    59.6    +      -       -      +
    296E  GLY*     3.3    12.7    +      -       -      -
    298E  ASN*     3.3    28.7    -      -       -      +
    318E  ASN      5.6     1.9    +      -       -      +
    319E  LEU*     4.3    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 294 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290E  GLN*     3.2    24.4    +      -       -      +
    291E  GLN*     3.3    35.4    +      -       -      +
    293E  LYS*     1.3    78.7    -      -       -      +
    295E  THR*     1.3    63.2    +      -       -      +
    348E  LEU*     4.6     2.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 295 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247E  LYS*     5.2     2.1    -      -       -      +
    291E  GLN      3.1    15.0    +      -       -      -
    292E  ILE      3.0     8.4    +      -       -      -
    294E  GLU*     1.3    82.8    -      -       -      +
    296E  GLY*     1.3    56.9    +      -       -      +
    348E  LEU*     3.5    19.5    +      -       +      +
    349E  THR*     3.7    14.8    -      -       -      +
    350E  ALA*     3.7    39.2    -      -       +      +
    353E  LEU*     3.7    14.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 296 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247E  LYS*     4.5     6.5    -      -       -      -
    292E  ILE*     2.8    19.4    +      -       -      +
    293E  LYS*     3.3    13.4    +      -       -      -
    295E  THR*     1.3    79.8    -      -       -      +
    297E  ALA*     1.3    72.9    +      -       -      +
    298E  ASN*     3.7     5.6    -      -       -      -
    353E  LEU*     4.2     2.1    -      -       -      +
----------------------------------------------------------
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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