Contacts of the helix formed by residues 277 - 301 (chain 2) in PDB entry 4BOG


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 TYR 277 (chain 2).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    1352  PHE*     3.8    24.2    -      +       -      -
    1362  PRO*     3.3    28.3    -      -       +      +
    1372  PHE*     3.3    38.8    -      +       -      -
    1382  ASP*     4.7     1.1    +      -       -      -
    2102  ILE*     4.1     0.8    -      -       +      +
    2732  LEU*     4.5    11.9    -      -       +      -
    2742  ILE*     2.9    48.4    +      -       +      +
    2752  GLY      2.4     6.7    +      -       -      -
    2762  LYS*     1.3    71.0    -      -       +      +
    2782  MET*     1.3    53.1    +      -       -      +
    2792  LEU      2.9     4.5    -      -       -      -
    2802  PHE*     2.7    66.6    +      +       -      +
    2812  THR*     4.0     0.5    +      -       -      -
    4312  ILE*     4.8     9.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 278 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2311  ASN*     4.9     4.9    -      -       -      +
    2612  VAL*     5.0     9.6    -      -       +      -
    2642  ILE*     3.6    39.7    -      -       +      -
    2682  SER*     6.2     0.9    -      -       -      +
    2732  LEU*     5.5     9.4    -      -       +      +
    2752  GLY*     2.9    13.6    +      -       -      +
    2772  TYR*     1.3    74.4    -      -       -      +
    2792  LEU*     1.3    50.8    +      -       +      +
    2802  PHE      3.0     0.2    -      -       -      -
    2812  THR*     2.6    50.0    +      -       -      -
    2822  MET*     2.8    63.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 279 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2752  GLY      3.7     8.5    -      -       -      +
    2762  LYS*     3.2    35.2    -      -       +      +
    2772  TYR      2.8     0.2    +      -       -      -
    2782  MET*     1.3    78.8    -      -       +      +
    2802  PHE*     1.3    69.1    +      -       +      +
    2822  MET*     3.2    25.0    -      -       +      +
    2832  ILE*     3.5    14.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 280 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2762  LYS*     2.6    29.2    -      -       +      -
    2772  TYR*     2.7    49.8    +      +       -      +
    2792  LEU*     1.3    76.1    -      -       +      +
    2812  THR*     1.3    58.4    +      -       -      +
    2832  ILE*     5.1     0.2    -      -       -      -
    2842  PHE*     2.6    63.7    +      +       +      -
    4242  SER      5.8     1.1    -      -       -      -
    4272  ALA*     5.6     6.7    -      -       +      -
    4282  GLY*     5.4    12.3    -      -       -      -
    4312  ILE*     4.0    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 281 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2182  VAL*     4.0    27.4    -      -       +      -
    2222  CYS*     6.2     4.3    -      -       -      -
    2602  ILE*     6.5     0.4    -      -       +      -
    2612  VAL*     6.3     0.4    -      -       -      -
    2642  ILE*     5.5     7.4    -      -       +      -
    2772  TYR      4.3     0.5    +      -       -      -
    2782  MET*     2.6    45.0    +      -       -      -
    2802  PHE*     1.3    76.0    -      -       +      +
    2822  MET*     1.3    68.5    +      -       -      +
    2842  PHE*     4.1     9.6    -      -       +      -
    2852  VAL*     2.7    31.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 282 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2311  ASN*     3.9    26.9    -      -       -      +
    2341  THR*     5.3    11.0    -      -       +      -
    2612  VAL*     5.5     6.7    -      -       +      -
    2782  MET*     2.8    36.7    +      -       +      +
    2792  LEU*     3.2    23.6    -      -       +      +
    2802  PHE      3.2     0.2    -      -       -      -
    2812  THR*     1.3    78.7    -      -       -      +
    2832  ILE*     1.3    56.0    +      -       +      +
    2852  VAL*     3.9     6.9    -      -       +      +
    2862  ILE*     2.7    67.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 283 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2792  LEU      3.6    14.1    -      -       -      +
    2802  PHE*     3.9     2.9    -      -       -      +
    2822  MET*     1.3    80.0    -      -       +      +
    2842  PHE*     1.3    71.0    +      -       +      +
    2862  ILE*     3.1    17.0    -      -       +      +
    2872  SER*     2.5    38.3    +      -       -      -
    2902  ILE*     4.8     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 284 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2252  PHE*     5.9     1.7    -      -       +      -
    2802  PHE*     2.6    57.6    +      +       +      +
    2812  THR*     3.8     9.2    -      -       +      +
    2832  ILE*     1.3    86.8    -      -       +      +
    2852  VAL*     1.3    58.8    +      -       +      +
    2872  SER*     2.6    27.6    +      -       -      -
    2882  SER*     3.3     4.7    +      -       -      -
    4202  ILE*     4.6    13.6    -      -       +      +
    4232  VAL*     5.3     5.4    -      -       +      -
    4242  SER*     2.9    53.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 285 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2222  CYS*     5.3     0.7    -      -       -      -
    2252  PHE*     3.1    42.2    -      -       +      -
    2572  LEU*     4.2    30.0    -      -       +      +
    2612  VAL*     5.6     8.7    -      -       +      -
    2812  THR*     2.7    26.3    +      -       +      +
    2822  MET*     4.0     9.0    -      -       +      +
    2842  PHE*     1.3    71.1    -      -       +      +
    2862  ILE*     1.3    68.6    +      -       +      +
    2872  SER      2.6     5.6    -      -       -      -
    2882  SER*     2.8    18.5    +      -       -      +
    2892  ILE*     3.0    14.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 286 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2341  THR*     5.7     7.2    -      -       +      -
    2381  LEU*     4.0    30.3    -      -       +      -
    2822  MET*     2.7    75.7    +      -       +      +
    2832  ILE*     3.1    18.4    -      -       +      +
    2852  VAL*     1.3    76.8    -      -       +      +
    2872  SER*     1.3    51.7    +      -       -      +
    2892  ILE*     3.0     7.2    +      -       +      -
    2902  ILE*     2.4    55.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 287 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2832  ILE      2.5    12.5    +      -       -      -
    2842  PHE*     2.6    18.4    -      -       -      -
    2852  VAL      2.6     0.8    -      -       -      -
    2862  ILE*     1.3    77.1    -      -       -      +
    2882  SER*     1.3    55.2    +      -       -      -
    2902  ILE*     2.9    24.2    -      -       -      +
    2912  VAL*     2.7    47.8    +      -       -      +
    4172  ILE*     5.7     0.3    -      -       -      +
    4202  ILE*     3.1    29.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 288 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2252  PHE*     5.2    10.2    -      -       -      -
    2292  THR*     3.1    31.6    -      -       -      +
    2532  LEU*     4.8     7.7    -      -       -      +
    2572  LEU*     5.4     7.2    -      -       -      +
    2842  PHE      3.3     3.9    +      -       -      -
    2852  VAL*     2.8    22.8    +      -       -      -
    2872  SER*     1.3    74.7    -      -       -      +
    2892  ILE*     1.3    57.4    +      -       -      +
    2912  VAL*     3.9     4.2    -      -       -      +
    2922  THR*     2.7    31.1    +      -       -      -
    4172  ILE*     6.0     5.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 289 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2381  LEU*     3.6    35.4    -      -       +      -
    2411  PHE*     4.6     4.0    -      -       +      -
    2532  LEU*     5.7     4.5    -      -       +      -
    2542  THR*     4.7     7.6    -      -       -      +
    2572  LEU*     4.8    17.9    -      -       +      -
    2582  LEU*     4.6    20.4    -      -       +      -
    2852  VAL*     3.0    12.2    +      -       +      +
    2862  ILE*     3.4    13.5    -      -       +      +
    2872  SER      3.0     0.6    -      -       -      -
    2882  SER*     1.3    76.0    -      -       -      +
    2902  ILE*     1.3    58.6    +      -       +      +
    2922  THR*     3.0    10.9    +      -       +      +
    2932  VAL*     2.5    50.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 290 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2832  ILE      4.8     1.3    -      -       -      +
    2862  ILE*     2.4    51.2    +      -       +      +
    2872  SER*     2.7    51.1    -      -       -      +
    2892  ILE*     1.3    67.6    -      -       +      +
    2912  VAL*     1.3    67.5    +      -       +      +
    2932  VAL*     2.8    30.2    -      -       -      +
    2942  VAL*     3.0    13.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 291 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2332  PHE*     3.7     9.0    -      -       +      -
    2872  SER*     2.7    41.2    +      -       -      +
    2882  SER*     3.9     4.9    -      -       -      +
    2902  ILE*     1.3    79.6    -      -       +      +
    2922  THR*     1.3    56.1    +      -       -      +
    2932  VAL      2.9     1.5    +      -       -      -
    2942  VAL*     3.0     3.6    +      -       +      -
    2952  VAL*     2.4    67.7    +      -       +      +
    4132  VAL*     3.4    35.2    -      -       +      -
    4172  ILE*     5.4     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 292 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2411  PHE*     6.1     0.7    -      -       +      -
    2292  THR*     6.5     0.7    -      -       -      -
    2322  VAL*     4.9     2.9    -      -       -      +
    2502  LEU*     2.5    39.3    -      -       +      +
    2532  LEU*     5.2     3.4    -      -       +      -
    2882  SER*     2.7    20.9    +      -       -      +
    2892  ILE*     3.2    19.5    -      -       +      +
    2912  VAL*     1.3    73.1    -      -       -      +
    2932  VAL*     1.3    68.5    -      -       +      +
    2952  VAL*     3.0    13.2    -      -       -      +
    2962  ILE*     2.7    50.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 293 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2411  PHE*     2.9    46.4    -      -       +      -
    2451  LEU*     4.8     2.9    -      -       +      -
    2892  ILE*     2.5    39.7    +      -       +      +
    2902  ILE*     2.8    15.5    -      -       -      +
    2922  THR*     1.3    78.4    -      -       +      +
    2942  VAL*     1.3    62.3    +      -       +      +
    2972  ASN*     2.4    54.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 294 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2902  ILE      3.0     9.7    +      -       -      +
    2912  VAL*     3.8     5.2    -      -       -      +
    2932  VAL*     1.3    86.9    -      -       +      +
    2952  VAL*     1.3    60.1    +      -       +      +
    2972  ASN*     4.1     2.9    -      -       -      -
    2982  THR*     2.3    60.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 295 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2322  VAL*     4.0    24.7    -      -       +      -
    2332  PHE*     3.9    11.4    -      -       +      -
    2912  VAL*     2.4    66.5    +      -       +      +
    2922  THR*     3.0    17.3    -      -       -      +
    2942  VAL*     1.3    73.1    -      -       +      +
    2962  ILE*     1.3    62.3    +      -       -      +
    2982  THR*     3.1     7.9    -      -       -      -
    2992  HIS*     2.2    35.5    +      -       -      +
    4092  ILE*     4.4    20.7    -      -       +      +
    4132  VAL*     4.2     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 296 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2322  VAL*     4.4     9.2    -      -       +      -
    2462  SER*     3.5    17.5    -      -       -      +
    2472  ILE*     4.4    15.3    -      -       +      -
    2502  LEU*     3.0    29.8    -      -       +      -
    2922  THR*     2.7    50.6    +      -       +      +
    2952  VAL*     1.3    77.2    -      -       -      +
    2972  ASN*     1.3    61.6    +      -       -      +
    2992  HIS*     2.9    29.6    -      -       +      +
    3002  HIS*     2.4    50.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 297 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2411  PHE*     5.1     0.6    -      -       -      -
    2451  LEU*     3.0    45.0    -      -       -      +
    2491  LEU*     4.3    15.2    -      -       -      +
    2521  GLU*     5.1     2.3    -      -       -      +
    2922  THR      4.3     1.2    +      -       -      -
    2932  VAL*     2.4    41.7    +      -       -      +
    2942  VAL*     3.4     5.2    -      -       -      +
    2962  ILE*     1.3    78.1    -      -       -      +
    2982  THR*     1.3    52.1    +      -       -      +
    3002  HIS*     3.1     6.1    +      -       -      +
    3012  ARG*     2.7    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 298 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2942  VAL*     2.3    59.9    +      -       +      +
    2952  VAL*     3.4     7.4    -      -       -      +
    2972  ASN*     1.3    66.9    -      -       -      +
    2992  HIS*     1.3    61.8    +      -       -      +
    3012  ARG*     2.6    75.1    +      -       +      +
    4052  VAL*     5.7     2.0    -      -       +      -
    4092  ILE*     5.0    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 299 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2322  VAL*     3.6    10.1    +      -       -      +
    2352  LEU*     5.4     0.4    -      -       +      -
    2362  PRO*     2.8    55.1    -      -       +      +
    2402  GLY*     5.0     0.2    -      -       -      -
    2432  MET*     4.4    19.5    -      -       +      +
    2462  SER*     3.9    18.3    +      -       -      -
    2952  VAL      2.2    29.8    +      -       -      +
    2962  ILE*     2.7    34.7    +      -       +      +
    2982  THR*     1.3    72.4    -      -       -      +
    3002  HIS*     1.3    53.9    +      +       -      +
    3012  ARG*     3.4    10.6    +      -       -      +
    3022  SER*     4.9     0.3    +      -       -      -
    3062  HIS      2.3    22.9    -      -       -      +
    4062  ILE*     4.5     7.2    -      -       +      -
    4092  ILE*     6.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 300 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2491  LEU*     6.0     8.3    -      -       +      -
    2521  GLU*     3.1    17.7    -      -       +      +
    2531  SER*     4.8     3.1    -      -       -      -
    2561  LYS*     3.9    31.9    -      -       +      +
    2432  MET*     3.6    39.6    +      -       +      +
    2442  THR*     4.6     1.8    -      -       -      -
    2472  ILE*     3.9    22.4    -      -       +      +
    2962  ILE*     2.4    50.7    +      -       +      +
    2972  ASN*     3.5     4.9    -      -       -      +
    2992  HIS*     1.3    69.1    -      +       +      -
    3012  ARG*     1.3    49.3    +      -       -      +
    3022  SER      2.6    18.4    +      -       -      +
    3062  HIS*     2.6    42.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 301 (chain 2). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2521  GLU*     2.9    26.4    -      -       -      +
    2972  ASN      2.7     9.0    +      -       -      +
    2982  THR*     2.6    65.2    +      -       +      +
    2992  HIS*     4.1     6.4    +      -       -      +
    3002  HIS*     1.3    69.5    -      -       -      +
    3022  SER*     1.3    68.6    +      -       -      +
    3032  PRO*     4.0     3.1    -      -       -      +
    4002  LYS      5.5     3.8    +      -       -      -
    4012  TYR*     6.4     0.4    -      -       -      +
    4022  VAL*     5.9     3.8    -      -       -      +
    4052  VAL*     3.2    43.9    -      -       -      +
    4062  ILE*     3.9    23.4    -      -       -      +
    4092  ILE*     5.3     2.0    -      -       -      +
----------------------------------------------------------
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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