Contacts of the helix formed by residues 199 - 223 (chain A) in PDB entry 1N1E


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 ASP 199 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    171A  ALA*     4.0     3.4    -      -       -      -
    197A  THR*     3.2     8.2    +      -       -      +
    198A  THR*     1.3    76.4    +      -       -      +
    200A  THR*     1.3    57.3    +      -       -      +
    201A  VAL*     4.0     1.4    +      -       -      +
    202A  GLY*     3.0    23.9    +      -       -      -
    203A  CYS*     3.0    30.0    +      -       -      -
    250A  GLY*     3.8     3.3    -      -       -      -
    251A  ASP*     3.2    31.6    +      -       -      +
    252A  GLY      3.2     6.4    +      -       -      -
    253A  SER*     3.2    27.2    +      -       -      +
    254A  ALA*     3.0    28.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148A  LEU      5.8     1.8    -      -       -      +
    149A  SER*     5.8     0.4    -      -       -      -
    150A  VAL*     4.8    13.6    -      -       +      +
    171A  ALA*     3.7    36.8    -      -       +      +
    172A  SER*     3.7    12.6    -      -       -      +
    173A  ALA*     4.0     5.0    -      -       +      +
    198A  THR      2.8    18.5    +      -       -      +
    199A  ASP*     1.3    69.9    -      -       -      +
    201A  VAL*     1.3    73.9    +      -       -      +
    203A  CYS*     3.4     2.4    +      -       -      +
    204A  GLU*     3.0    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  PHE*     6.0     0.9    -      -       +      -
    199A  ASP*     3.3     1.0    +      -       -      +
    200A  THR*     1.3    87.2    +      -       -      +
    202A  GLY*     1.3    56.9    +      -       -      +
    204A  GLU*     3.2    18.2    +      -       -      +
    205A  VAL*     2.9    37.1    +      -       +      +
    245A  THR*     4.4     2.7    -      -       +      +
    248A  LEU*     3.9    31.9    -      -       +      +
    249A  GLY      5.0     1.8    -      -       -      +
    250A  GLY*     3.7    31.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199A  ASP*     3.0    28.9    +      -       -      -
    201A  VAL*     1.3    78.2    -      -       -      +
    203A  CYS*     1.3    61.5    +      -       -      +
    205A  VAL*     4.1     0.9    -      -       -      +
    206A  ALA*     3.0    26.9    +      -       -      +
    241A  ILE*     5.2     0.2    -      -       -      +
    245A  THR*     3.8    22.0    +      -       -      +
    254A  ALA*     3.8     9.4    -      -       -      +
    255A  VAL*     5.3     2.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150A  VAL*     4.3    11.4    -      -       +      -
    152A  ALA*     4.0    15.7    -      -       +      -
    169A  SER*     4.6     7.2    -      -       -      -
    171A  ALA*     3.8    17.7    -      -       +      -
    197A  THR*     4.2    10.8    -      -       -      -
    199A  ASP      3.0    22.2    +      -       -      +
    200A  THR      3.7     4.9    -      -       -      +
    201A  VAL      3.3     0.2    -      -       -      -
    202A  GLY*     1.3    75.0    -      -       -      +
    204A  GLU*     1.3    60.4    +      -       -      +
    206A  ALA*     3.7     1.4    -      -       -      +
    207A  SER*     2.9    33.6    +      -       -      -
    254A  ALA*     3.8     9.6    -      -       -      +
    259A  ALA*     3.8    23.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  GLY      5.0     0.9    +      -       -      +
    134A  PHE*     3.5    46.3    -      -       +      +
    135A  PRO*     5.1     5.3    -      -       +      +
    136A  ALA*     3.8    23.0    +      -       -      +
    137A  GLU*     4.4    11.5    +      -       -      +
    150A  VAL*     4.6    14.8    -      -       +      +
    200A  THR*     3.0    18.8    +      -       -      +
    201A  VAL*     3.4    28.2    +      -       -      +
    203A  CYS*     1.3    74.4    -      -       -      +
    205A  VAL*     1.3    67.2    +      -       -      +
    207A  SER*     3.6     6.6    +      -       -      -
    208A  ALA*     3.1    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134A  PHE*     3.7    16.4    -      -       +      -
    201A  VAL*     2.9    32.4    +      -       +      +
    202A  GLY      4.1     0.2    -      -       -      +
    204A  GLU*     1.3    73.1    -      -       -      +
    206A  ALA*     1.3    67.3    +      -       -      +
    208A  ALA*     3.2     1.0    +      -       -      -
    209A  VAL*     3.0    33.8    +      -       +      +
    241A  ILE*     4.0    10.1    -      -       +      +
    244A  LEU*     3.9    26.2    -      -       +      -
    245A  THR*     3.5    25.4    -      -       -      +
    248A  LEU*     3.6    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202A  GLY      3.0    19.8    +      -       -      +
    203A  CYS      3.7     2.2    -      -       -      +
    205A  VAL*     1.3    78.4    -      -       -      +
    207A  SER*     1.3    56.9    +      -       -      +
    210A  LYS*     2.9    35.9    +      -       -      +
    241A  ILE*     3.9    22.7    -      -       +      +
    254A  ALA      5.1     1.3    -      -       -      +
    255A  VAL*     5.4     0.7    -      -       -      -
    259A  ALA*     3.4    22.7    -      -       +      +
    260A  GLY*     3.6    17.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  THR      5.5     0.4    -      -       -      -
    125A  LYS*     3.5    37.5    -      -       -      +
    150A  VAL*     5.7     0.7    -      -       -      +
    151A  LEU      5.0     0.3    +      -       -      -
    152A  ALA*     3.6    21.3    -      -       -      +
    203A  CYS      2.9    19.3    +      -       -      -
    204A  GLU*     3.9     8.2    -      -       -      -
    206A  ALA*     1.3    77.7    -      -       -      +
    208A  ALA*     1.3    62.0    +      -       -      +
    210A  LYS*     3.4    26.8    -      -       -      +
    211A  ASN*     3.7     9.2    +      -       -      -
    259A  ALA      4.7     1.8    +      -       -      -
    263A  ASP*     4.4     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126A  GLY*     3.7    24.8    -      -       -      +
    127A  ILE*     3.7    32.5    -      -       +      -
    134A  PHE*     3.9     4.5    -      -       +      -
    204A  GLU      3.1    18.0    +      -       -      +
    205A  VAL      3.2     2.7    +      -       -      +
    207A  SER*     1.3    76.9    -      -       -      +
    209A  VAL*     1.3    64.7    +      -       +      +
    211A  ASN*     3.5    16.7    +      -       -      +
    212A  VAL      3.8     2.1    +      -       -      -
    304A  THR*     3.8    15.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127A  ILE*     5.5     0.4    -      -       +      -
    205A  VAL*     3.0    21.6    +      -       +      +
    208A  ALA*     1.3    77.2    -      -       +      +
    210A  LYS*     1.3    65.7    +      -       -      +
    212A  VAL*     2.9    14.1    +      -       -      +
    213A  LEU*     3.0    16.7    +      -       +      +
    240A  GLU      5.0     0.2    -      -       -      -
    241A  ILE*     3.5    26.2    -      -       +      +
    244A  LEU*     4.0    15.7    -      -       +      -
    308A  LEU*     4.0    31.2    -      -       +      -
    319A  MET*     3.9     9.6    -      -       +      -
    322A  CYS*     3.8    25.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  LYS*     4.0     3.8    -      -       -      -
    206A  ALA      2.9    22.7    +      -       -      +
    207A  SER*     3.4    12.3    -      -       -      +
    209A  VAL*     1.3    76.6    -      -       -      +
    211A  ASN*     1.3    85.8    +      -       -      +
    213A  LEU*     3.7     3.2    -      -       -      +
    214A  ALA*     2.9    30.1    +      -       -      +
    241A  ILE*     4.3     3.7    -      -       +      +
    260A  GLY      5.3     0.9    -      -       -      +
    263A  ASP*     3.2    27.8    +      -       +      +
    264A  LEU*     3.8    35.7    -      -       +      +
    267A  THR*     2.9    30.6    +      -       -      +
    268A  CYS*     4.9     0.2    -      -       -      -
    400A  NDE      2.7    32.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  LYS*     4.1    12.5    +      -       -      +
    126A  GLY*     5.6     0.4    -      -       -      -
    207A  SER      3.7    11.7    +      -       -      -
    208A  ALA*     3.5     9.4    +      -       -      +
    209A  VAL      3.1     0.8    -      -       -      -
    210A  LYS*     1.3   108.3    +      -       -      +
    212A  VAL*     1.3    60.8    +      -       -      +
    214A  ALA*     3.5     2.1    +      -       -      -
    215A  ILE*     3.3    18.9    +      -       -      +
    267A  THR*     4.0     0.9    -      -       -      +
    275A  ASN*     3.0    37.2    +      -       -      +
    300A  GLU*     3.6    22.0    -      -       +      +
    301A  GLY*     3.7    14.1    -      -       -      +
    400A  NDE      3.3    11.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208A  ALA      4.1     2.7    -      -       -      +
    209A  VAL      2.9     7.6    +      -       -      +
    211A  ASN*     1.3    75.2    -      -       -      +
    213A  LEU*     1.3    64.8    +      -       -      +
    215A  ILE*     3.0    22.4    +      -       -      +
    216A  GLY      3.3     3.8    +      -       -      -
    301A  GLY*     3.7    23.1    -      -       -      +
    304A  THR*     3.9    18.2    -      -       +      -
    305A  ALA*     3.9    14.1    -      -       +      -
    308A  LEU*     3.9    22.4    -      -       +      -
    322A  CYS*     4.0    24.7    -      -       +      +
    325A  ILE*     3.5    26.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 213 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  VAL*     3.0    28.0    +      -       +      +
    210A  LYS      3.7     1.6    -      -       -      +
    212A  VAL*     1.3    75.4    -      -       -      +
    214A  ALA*     1.3    56.8    +      -       -      +
    216A  GLY*     3.0     4.9    +      -       -      -
    217A  SER      2.9    23.0    +      -       -      -
    233A  LEU*     3.7    15.0    -      -       +      +
    237A  GLY*     3.5    38.6    -      -       -      +
    240A  GLU*     4.3     1.3    -      -       -      +
    241A  ILE*     4.2     5.8    -      -       +      -
    264A  LEU*     3.7    31.2    -      -       +      -
    268A  CYS*     4.1     3.4    -      -       -      -
    321A  LEU*     3.8    30.3    -      -       +      -
    322A  CYS*     3.9    16.8    -      -       -      -
    325A  ILE*     4.0     5.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 214 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  LYS      2.9    17.7    +      -       -      +
    211A  ASN      3.7     6.3    -      -       -      +
    212A  VAL      3.2     0.4    -      -       -      -
    213A  LEU*     1.3    73.2    -      -       -      +
    215A  ILE*     1.3    65.3    +      -       -      +
    217A  SER*     3.3     3.5    +      -       -      +
    218A  GLY      3.0    18.0    +      -       -      -
    267A  THR*     3.5    40.2    -      -       +      +
    268A  CYS*     3.8    11.4    -      -       -      -
    273A  SER*     4.2     1.1    -      -       -      +
    275A  ASN*     4.0     7.9    -      -       +      -
    276A  PHE*     3.4    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 215 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  ASN      3.5     9.9    -      -       -      +
    212A  VAL*     3.0    10.4    +      -       -      +
    214A  ALA*     1.3    77.8    -      -       -      +
    216A  GLY*     1.3    55.7    +      -       -      +
    218A  GLY      3.2     2.3    +      -       -      -
    219A  VAL*     2.9    28.1    +      -       +      +
    275A  ASN*     3.4    24.2    -      -       +      +
    278A  VAL*     4.6     2.9    -      -       +      -
    279A  GLY*     3.2    24.5    -      -       -      +
    282A  LEU*     4.1    17.0    -      -       +      -
    301A  GLY*     3.7    32.8    -      -       -      +
    302A  VAL*     3.7    20.2    -      -       +      +
    305A  ALA*     5.8     0.2    -      -       +      -
    325A  ILE*     3.9    16.2    -      -       +      -
    328A  ILE*     6.2     0.2    -      -       +      -
    329A  VAL*     4.2    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 216 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212A  VAL      3.3     4.4    +      -       -      -
    213A  LEU      3.0     8.9    +      -       -      -
    215A  ILE*     1.3    79.6    -      -       -      +
    217A  SER*     1.3    60.3    +      -       -      +
    219A  VAL*     3.2     9.8    +      -       -      +
    220A  ALA*     3.0    22.0    +      -       -      +
    233A  LEU*     3.7    12.5    -      -       -      +
    325A  ILE*     3.7    24.3    -      -       -      +
    328A  ILE*     6.4     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 217 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213A  LEU      2.9     7.5    +      -       -      -
    214A  ALA      3.7     7.6    -      -       -      -
    216A  GLY*     1.3    74.0    -      -       -      +
    218A  GLY*     1.3    62.4    +      -       -      +
    220A  ALA*     3.2     7.4    +      -       -      +
    221A  ASN*     3.1    21.7    +      -       -      +
    230A  ARG*     3.6    17.1    +      -       -      +
    233A  LEU*     3.8    18.0    -      -       -      +
    268A  CYS*     2.5    47.9    +      -       -      +
    276A  PHE*     3.7     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 218 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214A  ALA      3.0    10.7    +      -       -      -
    215A  ILE      3.2     2.4    +      -       -      -
    217A  SER*     1.3    77.1    -      -       -      +
    219A  VAL*     1.3    55.4    +      -       -      +
    221A  ASN*     3.2     2.8    +      -       -      +
    222A  GLY      2.9    24.6    +      -       -      -
    276A  PHE*     3.3    40.0    -      -       -      -
    279A  GLY      3.3     7.4    -      -       -      -
    280A  LYS*     3.1     8.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 219 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  ILE*     2.9    24.6    +      -       +      +
    216A  GLY*     3.2    11.9    +      -       -      +
    218A  GLY*     1.3    73.9    -      -       -      +
    220A  ALA*     1.3    64.6    +      -       -      +
    222A  GLY      3.2     1.4    +      -       -      -
    223A  LEU*     2.9    41.9    +      -       +      +
    279A  GLY*     3.3    23.1    +      -       -      +
    282A  LEU*     4.2    13.5    -      -       +      -
    283A  GLY*     4.0     3.7    -      -       -      -
    325A  ILE*     6.1     0.2    -      -       +      -
    328A  ILE*     4.3    21.8    -      -       +      -
    335A  PRO*     3.9    18.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 220 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  GLY      3.0    12.4    +      -       -      +
    217A  SER*     3.2    12.8    +      -       -      +
    219A  VAL*     1.3    79.4    -      -       -      +
    221A  ASN*     1.3    58.7    +      -       -      +
    223A  LEU*     3.3     6.1    +      -       -      +
    224A  GLY      3.3     0.2    +      -       -      -
    225A  MET*     3.0    56.3    +      -       +      +
    226A  GLY      5.9     0.9    -      -       -      +
    229A  ALA*     5.2     8.3    -      -       +      -
    230A  ARG*     5.5     6.5    -      -       +      +
    233A  LEU*     5.1     7.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 221 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  SER      3.1     8.1    +      -       -      +
    218A  GLY      3.2     7.4    +      -       -      +
    220A  ALA*     1.3    74.2    -      -       -      +
    222A  GLY*     1.3    58.8    +      -       -      +
    224A  GLY*     3.0    18.5    +      -       -      -
    225A  MET      4.2    12.6    +      -       -      +
    230A  ARG*     3.9    16.9    -      -       -      +
    276A  PHE*     3.7    24.6    -      -       +      -
    280A  LYS*     3.4    32.1    -      -       -      +
    284A  LYS*     4.7     4.9    +      -       -      -
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Residues in contact with GLY 222 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218A  GLY      2.9    11.1    +      -       -      -
    219A  VAL      3.7     4.0    -      -       -      -
    221A  ASN*     1.3    79.3    +      -       -      +
    223A  LEU*     1.3    59.3    +      -       -      +
    224A  GLY      3.2     1.0    +      -       -      -
    280A  LYS*     3.8    24.7    -      -       -      -
    283A  GLY      3.6    16.2    -      -       -      +
    284A  LYS*     3.8    26.5    +      -       -      +
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Residues in contact with LEU 223 (chain A). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  VAL*     2.9    37.1    +      -       +      +
    220A  ALA*     3.6     6.3    -      -       -      +
    221A  ASN      3.2     0.2    -      -       -      -
    222A  GLY*     1.3    76.6    -      -       -      +
    224A  GLY*     1.3    59.4    +      -       -      +
    225A  MET*     3.7    12.3    +      -       +      +
    283A  GLY      3.7    13.5    -      -       -      +
    335A  PRO*     4.0    25.4    -      -       +      +
    336A  ARG*     3.6    56.8    +      -       +      +
    339A  LEU*     4.4    23.3    -      -       +      -
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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