Contacts of the helix formed by residues 2324 - 2347 (chain C) in PDB entry 1DDX


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 GLY2324 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2322C  GLU      4.3     0.2    +      -       -      -
   2323C  TRP*     1.3    76.8    -      -       -      +
   2325C  ASP*     1.3    70.5    +      -       -      +
   2326C  GLU      3.3     2.5    -      -       -      -
   2327C  GLN*     2.9    12.9    +      -       -      +
   2328C  LEU*     2.8    24.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP2325 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2245C  ARG*     2.7    24.0    +      -       -      -
   2247C  PHE*     3.0    25.4    +      -       -      +
   2248C  LYS*     2.6    33.0    +      -       -      +
   2249C  ASP      4.1     6.7    -      -       -      +
   2250C  GLY*     2.6    34.3    +      -       -      +
   2324C  GLY*     1.3    73.9    -      -       -      +
   2326C  GLU*     1.3    60.1    +      -       -      +
   2328C  LEU*     3.0     1.0    +      -       -      +
   2329C  PHE*     2.9    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU2326 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2238C  LEU*     5.4     1.9    -      -       -      +
   2241C  GLN*     4.9     0.2    -      -       -      +
   2242C  HIS*     4.3     9.3    -      -       +      -
   2245C  ARG*     3.0    39.3    +      -       -      +
   2247C  PHE*     5.1     2.7    -      -       +      -
   2324C  GLY      3.3     0.4    -      -       -      -
   2325C  ASP*     1.3    79.0    +      -       -      +
   2327C  GLN*     1.3    56.6    +      -       -      +
   2329C  PHE      4.2     1.3    -      -       -      -
   2330C  GLN*     3.0    26.6    +      -       -      +
   3134D  TYR*     3.0    39.7    +      -       -      -
   3136D  TYR*     3.2     5.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN2327 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2323C  TRP*     3.2    63.5    +      -       +      +
   2324C  GLY*     2.9    19.6    +      -       -      +
   2326C  GLU*     1.3    72.7    -      -       -      +
   2328C  LEU*     1.3    56.2    +      -       -      +
   2330C  GLN*     3.2     1.7    +      -       -      +
   2331C  THR*     2.5    42.1    +      -       -      +
   3049D  SER*     5.1     1.1    +      -       -      -
   3136D  TYR*     2.7    53.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU2328 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2249C  ASP*     3.3    42.0    -      -       +      +
   2313C  CYS*     4.0     5.8    -      -       -      +
   2316C  LEU*     3.4    33.8    -      -       +      +
   2317C  LYS*     3.5    25.4    -      -       +      +
   2320C  HIS      5.8     0.2    -      -       -      +
   2323C  TRP*     4.2    26.2    -      -       +      +
   2324C  GLY      2.8    21.3    +      -       -      +
   2325C  ASP      3.5     3.8    -      -       -      +
   2327C  GLN*     1.3    76.7    -      -       -      +
   2329C  PHE*     1.3    65.1    +      -       -      +
   2331C  THR*     2.8     6.5    +      -       -      -
   2332C  SER*     2.8    29.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE2329 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2234C  TYR*     4.0    29.2    -      +       +      -
   2241C  GLN*     2.7    39.7    -      -       -      -
   2245C  ARG*     3.2    48.5    -      -       +      +
   2250C  GLY*     3.3    35.9    -      -       -      -
   2251C  LYS      5.3     0.2    -      -       -      -
   2252C  LEU*     4.9     3.4    -      -       +      -
   2309C  HIS*     3.6    12.5    -      +       -      -
   2325C  ASP      2.9    11.3    +      -       -      +
   2326C  GLU      4.3     0.2    -      -       -      +
   2328C  LEU*     1.3    77.4    -      -       -      +
   2330C  GLN*     1.3    87.3    +      -       +      +
   2332C  SER*     4.5     0.2    -      -       -      -
   2333C  ARG*     3.3    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN2330 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2238C  LEU*     5.9     1.2    -      -       -      +
   2241C  GLN*     4.7     4.2    +      -       -      +
   2245C  ARG*     4.6     0.4    -      -       -      +
   2326C  GLU*     3.0    37.9    +      -       -      +
   2327C  GLN*     3.2     4.6    +      -       -      +
   2328C  LEU      3.0     1.2    -      -       -      -
   2329C  PHE*     1.3    95.9    -      -       +      +
   2331C  THR*     1.3    66.4    +      -       -      +
   2333C  ARG*     3.6     6.2    +      -       -      +
   2334C  LEU*     3.2    26.3    +      -       -      +
   3134D  TYR*     3.6    14.6    +      -       +      -
   3136D  TYR*     4.6     3.8    -      -       +      -
   3137D  LYS      5.5     1.1    -      -       -      +
   3138D  SER*     3.0    34.5    +      -       -      -
   3139D  TRP*     3.4     7.3    +      -       -      +
   3140D  GLU*     3.1    34.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR2331 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2316C  LEU*     3.3    13.9    -      -       +      -
   2323C  TRP*     2.9    25.6    -      -       +      -
   2327C  GLN*     2.5    29.2    +      -       -      +
   2328C  LEU      2.8     0.4    +      -       -      -
   2330C  GLN*     1.3    69.4    -      -       -      +
   2332C  SER*     1.3    71.6    +      -       -      +
   2334C  LEU*     2.8    15.7    +      -       -      +
   2335C  ILE*     2.9    20.5    +      -       +      +
   2549C  THR      4.2     4.9    -      -       -      +
   2550C  PHE*     3.4    39.3    -      -       -      +
   2551C  GLY      3.6     4.0    -      -       -      +
   3136D  TYR*     5.6     0.7    -      -       -      -
   3137D  LYS      5.9     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER2332 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2234C  TYR*     4.4     1.1    -      -       -      -
   2309C  HIS*     3.3    27.4    -      -       -      -
   2312C  VAL*     3.2    30.3    -      -       -      +
   2313C  CYS*     3.1    26.8    +      -       -      -
   2316C  LEU*     3.8     2.4    -      -       -      +
   2328C  LEU      2.8    14.5    +      -       -      -
   2331C  THR*     1.3    74.4    -      -       -      +
   2333C  ARG*     1.3    55.5    +      -       -      -
   2334C  LEU      2.6     1.9    +      -       -      -
   2335C  ILE*     2.6    27.2    +      -       -      +
   2336C  LEU*     2.8    13.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG2333 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2229C  ASP*     2.7    31.2    +      -       -      +
   2230C  LEU*     4.2     0.5    -      -       -      +
   2231C  ASN*     4.2    11.1    -      -       -      +
   2234C  TYR*     3.1    66.9    +      -       +      +
   2235C  GLY      4.6     5.9    +      -       -      -
   2241C  GLN*     3.7    15.0    -      -       -      +
   2329C  PHE*     3.3    22.6    +      -       +      +
   2330C  GLN*     3.7     7.9    -      -       -      +
   2332C  SER*     1.3    78.4    -      -       -      +
   2334C  LEU*     1.3    60.2    +      -       -      +
   2336C  LEU*     4.0     1.1    -      -       -      -
   2337C  ILE*     3.1    30.6    +      -       +      +
   3139D  TRP*     3.4    47.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU2334 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2330C  GLN      3.2    15.4    +      -       -      +
   2331C  THR*     2.8    12.6    +      -       -      +
   2332C  SER      2.6     4.6    +      -       -      -
   2333C  ARG*     1.3    74.3    -      -       -      +
   2335C  ILE*     1.3    63.4    +      -       -      +
   2337C  ILE*     3.4     6.6    +      -       +      +
   2338C  GLY*     3.0    18.4    +      -       -      -
   2539C  ILE*     4.9    11.4    -      -       +      +
   2544C  TYR*     4.9     7.6    -      -       +      -
   2549C  THR*     3.5    37.0    -      -       +      +
   2550C  PHE*     4.0    18.4    -      -       +      -
   2559C  ILE*     4.0     2.6    -      -       -      +
   3137D  LYS*     3.9    21.8    -      -       +      +
   3138D  SER*     4.5     0.9    -      -       -      -
   3139D  TRP*     3.8    44.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE2335 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2312C  VAL*     3.9    17.3    -      -       +      -
   2316C  LEU*     3.9    17.3    -      -       +      -
   2331C  THR*     2.9    37.8    +      -       +      +
   2332C  SER*     2.6    12.7    +      -       -      +
   2334C  LEU*     1.3    68.2    -      -       -      +
   2336C  LEU*     1.3    66.5    +      -       -      +
   2338C  GLY      2.8    10.7    +      -       -      -
   2339C  GLU*     2.9    13.5    +      -       -      +
   2550C  PHE*     3.6    28.9    -      -       +      +
   2555C  GLY*     3.3    20.0    -      -       -      +
   2558C  ILE*     3.4    34.1    -      -       +      -
   2559C  ILE*     3.0    16.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU2336 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2230C  LEU*     3.7    14.4    -      -       +      -
   2233C  ILE*     4.8     5.8    -      -       +      -
   2234C  TYR*     3.3    24.0    -      -       +      +
   2305C  TRP*     4.1    17.2    -      -       +      +
   2308C  GLU*     3.2    34.3    -      -       +      +
   2309C  HIS*     3.5    35.0    -      -       +      +
   2312C  VAL*     3.9    15.3    -      -       +      -
   2332C  SER      2.8    17.0    +      -       -      +
   2333C  ARG      4.2     0.2    -      -       -      +
   2335C  ILE*     1.3    69.5    -      -       -      +
   2337C  ILE*     1.3    68.2    +      -       -      +
   2339C  GLU*     2.8    23.0    +      -       -      +
   2340C  THR*     2.9    14.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE2337 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2228C  VAL*     3.7    11.6    -      -       +      +
   2229C  ASP*     3.7    28.3    -      -       -      +
   2230C  LEU*     3.3    28.3    -      -       +      +
   2333C  ARG*     3.1    27.9    +      -       +      +
   2334C  LEU*     3.6     5.8    -      -       +      +
   2336C  LEU*     1.3    76.9    -      -       -      +
   2338C  GLY*     1.3    68.4    +      -       -      +
   2340C  THR*     3.4     3.5    +      -       -      -
   2341C  ILE*     2.9    29.3    +      -       +      +
   2537C  ASN*     4.2     9.2    -      -       -      +
   2539C  ILE*     3.9    28.5    -      -       +      -
   3139D  TRP*     3.9    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY2338 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2334C  LEU      3.0     8.4    +      -       -      -
   2335C  ILE      2.8    10.5    +      -       -      -
   2337C  ILE*     1.3    82.7    -      -       -      +
   2339C  GLU*     1.3    63.3    +      -       -      -
   2341C  ILE*     3.0     6.0    +      -       -      +
   2342C  LYS*     2.8    20.4    +      -       -      +
   2361C  PHE*     4.1     1.7    -      -       -      -
   2539C  ILE*     4.2    11.2    -      -       -      -
   2559C  ILE*     3.3    26.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU2339 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2305C  TRP*     3.7     9.7    -      -       +      -
   2308C  GLU*     2.5    38.3    -      -       -      +
   2311C  ARG*     3.9     2.1    +      -       -      -
   2335C  ILE*     2.9     9.7    +      -       -      +
   2336C  LEU*     2.8    28.8    +      -       -      +
   2338C  GLY*     1.3    67.8    -      -       -      -
   2340C  THR*     1.3    51.1    +      -       -      +
   2342C  LYS*     2.6    26.6    +      -       -      +
   2343C  ILE*     2.6    25.8    +      -       +      +
   2558C  ILE*     2.7    35.2    -      -       +      +
   2559C  ILE*     3.5     6.4    -      -       -      +
   2562C  ALA*     3.5    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR2340 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2201C  PHE*     5.5     1.6    -      -       +      -
   2205C  PHE*     3.8    22.7    -      -       +      -
   2208C  GLN*     4.7     0.2    -      -       -      +
   2228C  VAL*     3.7    24.0    -      -       +      -
   2230C  LEU*     3.6    22.0    -      -       +      +
   2305C  TRP*     3.0    33.9    -      -       +      -
   2336C  LEU      2.9    13.0    +      -       -      -
   2337C  ILE      3.4     8.3    -      -       -      -
   2339C  GLU*     1.3    72.9    -      -       -      +
   2341C  ILE*     1.3    66.3    +      -       -      +
   2342C  LYS      2.8     0.3    +      -       -      -
   2343C  ILE*     3.7     3.3    -      -       -      +
   2344C  VAL*     2.8    27.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE2341 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2228C  VAL*     3.5    28.9    -      -       +      -
   2337C  ILE*     2.9    31.0    +      -       +      +
   2338C  GLY*     3.4     8.1    -      -       -      +
   2340C  THR*     1.3    74.3    -      -       -      +
   2342C  LYS*     1.3    61.0    +      -       -      +
   2344C  VAL*     4.0     0.7    -      -       -      +
   2345C  ILE*     3.1    38.5    +      -       +      +
   2361C  PHE*     3.4    29.2    -      -       +      -
   2534C  LEU*     3.0    45.8    -      -       +      +
   2537C  ASN*     4.2    11.9    -      -       +      -
   2539C  ILE*     5.5     0.9    -      -       +      -
   2540C  CYS*     4.4     2.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS2342 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2338C  GLY      2.8    10.1    +      -       -      +
   2339C  GLU      2.6    19.7    +      -       -      +
   2341C  ILE*     1.3    68.1    -      -       -      +
   2343C  ILE*     1.3    59.7    +      -       -      +
   2344C  VAL      2.9     2.3    +      -       -      -
   2345C  ILE      3.1     1.9    +      -       -      -
   2346C  GLU*     2.7    73.9    +      -       +      +
   2360C  LYS*     6.0     0.2    -      -       -      +
   2361C  PHE*     3.5    21.3    +      -       +      +
   2559C  ILE*     3.3    20.6    -      -       +      +
   2560C  ASN*     3.0    34.0    +      -       -      +
   2561C  THR*     4.4     0.2    -      -       -      +
   2562C  ALA*     3.2    25.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE2343 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2201C  PHE*     3.9    22.2    -      -       +      -
   2305C  TRP*     4.3    11.4    -      -       +      -
   2339C  GLU*     2.6    20.0    +      -       +      +
   2340C  THR*     3.9     4.3    -      -       -      +
   2342C  LYS*     1.3    73.8    -      -       -      +
   2344C  VAL*     1.3    58.9    +      -       -      +
   2346C  GLU*     5.2     0.2    -      -       -      -
   2347C  ASP*     3.0    29.2    -      -       +      +
   2348C  TYR*     3.3     2.8    +      -       -      +
   2562C  ALA*     3.8    10.3    -      -       +      -
   2563C  SER      3.6    18.4    -      -       -      +
   2564C  ILE*     3.6    43.5    -      -       +      +
   2567C  LEU*     3.6    31.0    -      -       +      -
   2580C  PHE*     4.6     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL2344 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2201C  PHE*     3.6    28.5    -      -       +      -
   2205C  PHE*     3.5    35.2    -      -       +      -
   2340C  THR*     2.8    23.4    +      -       +      +
   2341C  ILE      4.0     3.1    -      -       -      +
   2342C  LYS      2.9     0.4    +      -       -      -
   2343C  ILE*     1.3    76.3    -      -       -      +
   2345C  ILE*     1.3    69.5    +      -       -      +
   2346C  GLU      3.2     0.2    +      -       -      -
   2348C  TYR*     3.3     9.9    +      -       +      -
   2349C  VAL*     2.9    39.6    +      -       +      -
   2534C  LEU*     3.8    22.7    -      -       +      -
   2701C  PGX      4.1     6.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE2345 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2113C  MET*     5.2     6.3    -      -       +      -
   2341C  ILE*     3.1    37.6    +      -       +      +
   2342C  LYS      3.1     1.9    +      -       -      +
   2344C  VAL*     1.3    83.6    -      -       -      +
   2346C  GLU*     1.3    63.6    +      -       +      +
   2349C  VAL*     3.3    12.2    -      -       +      +
   2350C  GLN      3.3    15.1    +      -       -      -
   2359C  LEU*     3.9    17.5    -      -       +      +
   2360C  LYS      4.1    13.2    -      -       -      +
   2361C  PHE*     3.6    31.6    -      -       +      -
   2531C  LEU*     4.4    13.5    -      -       +      -
   2534C  LEU*     3.5    26.5    -      -       +      -
   2535C  MET*     4.0    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU2346 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2109C  ARG*     3.7    10.6    +      -       -      -
   2342C  LYS*     2.7    63.6    +      -       +      +
   2343C  ILE*     5.2     0.2    -      -       -      -
   2345C  ILE*     1.3    72.8    -      -       -      +
   2347C  ASP*     1.3    65.8    +      -       -      +
   2350C  GLN*     2.9    22.5    +      -       -      +
   2358C  LYS*     5.9     2.3    -      -       -      +
   2359C  LEU      3.4    20.7    -      -       -      +
   2360C  LYS*     4.0     5.5    -      -       -      +
   2361C  PHE*     3.0    40.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP2347 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2343C  ILE*     3.0    18.5    +      -       -      +
   2346C  GLU*     1.3    82.8    -      -       -      +
   2348C  TYR*     1.3    77.1    +      -       -      +
   2349C  VAL      3.4     0.7    -      -       -      -
   2350C  GLN*     2.5    21.8    +      -       -      +
   2351C  HIS*     3.0     4.6    +      -       -      -
   2562C  ALA      5.5     0.2    -      -       -      -
   2563C  SER*     3.4    13.5    -      -       -      -
   2564C  ILE*     2.6    42.1    +      -       -      +
   2580C  PHE*     3.6    16.2    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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