Contacts of the helix formed by residues 2371 - 2394 (chain C) in PDB entry 1G50


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 THR2371 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2370C  LEU*     1.3    71.9    -      -       -      +
   2372C  LEU*     1.3    67.8    +      -       -      +
   2373C  HIS*     4.4     5.2    -      -       -      -
   2374C  ASP*     2.7    42.9    +      -       -      -
   2375C  GLN*     3.0     9.1    +      -       -      +
   2467C  LYS*     4.0    28.9    -      -       +      +
   2471C  GLU*     2.7    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU2372 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2362C  LYS*     5.8     5.2    -      -       -      +
   2370C  LEU      3.5     1.1    +      -       -      +
   2371C  THR*     1.3    69.4    -      -       -      +
   2373C  HIS*     1.3    69.4    +      -       +      +
   2375C  GLN*     3.0    30.8    +      -       -      +
   2376C  VAL*     2.9    29.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with HIS2373 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2371C  THR*     3.1     4.0    -      -       -      +
   2372C  LEU*     1.3    83.6    -      -       +      +
   2374C  ASP*     1.3    58.6    +      -       -      +
   2376C  VAL*     3.4    12.0    +      -       +      +
   2377C  HIS*     2.9    27.0    +      -       -      +
   2462C  LEU*     3.8    30.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP2374 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2370C  LEU*     4.6     3.4    -      -       +      -
   2371C  THR*     2.7    32.2    +      -       -      +
   2373C  HIS*     1.3    70.6    -      -       -      +
   2375C  GLN*     1.3    58.5    +      -       -      +
   2377C  HIS*     3.3     7.2    -      -       -      +
   2378C  LEU*     2.8    35.3    +      -       -      +
   2461C  PHE*     3.1    37.8    -      -       +      -
   2462C  LEU*     2.9    28.8    +      -       -      +
   2463C  SER*     4.3     5.5    +      -       -      -
   2468C  SER*     5.0     1.4    +      -       -      -
   2471C  GLU*     2.9    25.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN2375 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2362C  LYS*     3.8    17.5    -      -       -      +
   2367C  PHE*     3.3    60.8    -      -       +      +
   2368C  VAL*     3.7    21.4    +      -       -      +
   2370C  LEU*     2.8    27.6    +      -       +      -
   2371C  THR      3.0    10.2    +      -       -      +
   2372C  LEU*     3.0    35.2    +      -       -      +
   2374C  ASP*     1.3    74.6    -      -       -      +
   2376C  VAL*     1.3    67.8    +      -       -      +
   2378C  LEU*     3.4     2.2    +      -       -      +
   2379C  LEU*     3.2    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL2376 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2362C  LYS*     5.5     6.5    -      -       -      +
   2372C  LEU*     2.9    22.8    +      -       +      +
   2373C  HIS*     3.5    13.7    -      -       +      +
   2375C  GLN*     1.3    75.0    -      -       +      +
   2377C  HIS*     1.3    65.7    +      -       -      +
   2379C  LEU*     2.7    26.0    +      -       +      +
   2380C  GLU*     3.0    32.0    +      -       +      +
   2542C  GLU*     5.4     6.5    -      -       -      +
   2543C  MET*     5.8     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS2377 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2373C  HIS      2.9    18.3    +      -       -      +
   2374C  ASP*     3.3     9.4    -      -       -      +
   2376C  VAL*     1.3    75.2    -      -       -      +
   2378C  LEU*     1.3    65.5    +      -       -      +
   2380C  GLU*     3.5    17.8    +      -       +      +
   2381C  CYS*     2.8    36.3    +      -       +      +
   2457C  GLY      3.1    14.3    +      -       -      -
   2460C  THR*     2.7    39.2    +      -       -      -
   2461C  PHE*     3.0    40.6    +      +       -      -
   2462C  LEU*     4.2    11.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU2378 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2367C  PHE*     3.8    12.8    -      -       +      -
   2370C  LEU*     3.6    31.0    -      -       +      -
   2374C  ASP      2.8    20.9    +      -       -      +
   2375C  GLN      3.6     4.5    -      -       -      +
   2376C  VAL      3.2     0.2    -      -       -      -
   2377C  HIS*     1.3    75.2    +      -       -      +
   2379C  LEU*     1.3    62.9    +      -       -      +
   2381C  CYS*     3.2     3.8    +      -       -      +
   2382C  ALA*     3.1    26.2    +      -       -      +
   2453C  LEU*     3.5    20.4    -      -       +      +
   2454C  LEU*     3.7    36.3    -      -       +      +
   2456C  SER      4.1     4.7    -      -       -      +
   2457C  GLY      3.6    12.3    -      -       -      +
   2458C  VAL*     4.5     0.4    -      -       -      -
   2461C  PHE*     3.3    27.1    -      -       +      -
   2475C  ILE*     4.6     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU2379 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2357C  MET*     4.6    23.6    -      -       +      +
   2358C  ILE*     4.7    18.2    -      -       +      -
   2361C  ALA*     3.4    29.2    -      -       +      -
   2362C  LYS*     4.5    13.5    -      -       -      +
   2367C  PHE*     4.0    13.5    -      -       +      -
   2375C  GLN      3.2    18.1    +      -       -      +
   2376C  VAL*     2.7    16.3    +      -       +      +
   2378C  LEU*     1.3    70.4    -      -       -      +
   2380C  GLU*     1.3    55.7    +      -       -      +
   2381C  CYS      2.9     3.8    -      -       -      -
   2382C  ALA*     2.8     4.2    +      -       -      +
   2383C  TRP*     2.6    38.1    +      -       +      +
   2386C  ILE*     5.2     0.4    -      -       +      -
   2453C  LEU*     3.7    15.3    -      -       +      -
   2543C  MET*     4.7     4.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU2380 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2376C  VAL*     3.0    31.3    +      -       +      +
   2377C  HIS*     3.5    22.5    +      -       +      +
   2379C  LEU*     1.3    77.0    -      -       -      +
   2381C  CYS*     1.3    60.0    +      -       +      +
   2383C  TRP*     3.0     8.4    +      -       -      -
   2542C  GLU*     5.0     3.3    -      -       -      +
   2543C  MET*     3.5    38.0    -      -       +      +
   2546C  ALA*     3.8    25.6    -      -       +      +
   2547C  HIS*     2.9    26.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS2381 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1516B  HIS*     5.4     9.7    -      -       -      -
   2377C  HIS*     2.8    28.6    +      -       +      +
   2378C  LEU      3.6     4.9    -      -       -      +
   2379C  LEU      2.9     0.2    +      -       -      -
   2380C  GLU*     1.3    81.4    -      -       +      +
   2382C  ALA*     1.3    57.0    +      -       -      +
   2383C  TRP*     3.9     0.4    -      -       -      -
   2385C  GLU*     4.2     6.1    -      -       -      +
   2456C  SER*     4.1     6.7    -      -       -      +
   2457C  GLY*     3.5    29.2    -      -       -      -
   2460C  THR*     4.2    11.4    -      -       -      -
   2515C  ARG*     5.0     5.5    +      -       -      -
   2547C  HIS*     4.1    16.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA2382 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2378C  LEU      3.1    11.7    +      -       -      +
   2379C  LEU      2.8     2.0    +      -       -      +
   2381C  CYS*     1.3    80.0    -      -       -      +
   2383C  TRP*     1.3    66.3    +      -       -      +
   2384C  LEU      3.3     2.9    -      -       -      -
   2385C  GLU*     2.9    14.3    +      -       -      +
   2386C  ILE*     2.9    30.3    +      -       +      +
   2452C  ILE*     3.4    31.2    -      -       +      +
   2453C  LEU*     4.6     1.3    -      -       -      -
   2456C  SER*     3.5    13.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP2383 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2350C  ALA*     5.2     0.2    -      -       +      -
   2354C  LEU*     3.5    32.3    -      -       +      -
   2357C  MET*     3.2    23.3    -      -       -      +
   2379C  LEU*     2.6    19.3    +      -       +      +
   2380C  GLU      3.0    26.5    -      -       -      -
   2381C  CYS      4.9     0.2    -      -       -      -
   2382C  ALA*     1.3    71.7    -      -       -      +
   2384C  LEU*     1.3    85.4    +      -       +      +
   2386C  ILE*     4.7     1.3    -      -       -      +
   2387C  LEU*     2.9    44.3    +      -       +      +
   2522C  MET*     3.4    25.5    -      -       +      +
   2525C  LEU*     4.4    11.9    -      -       +      -
   2540C  LEU*     3.4    34.5    -      -       +      -
   2543C  MET*     3.3    45.4    +      -       +      -
   2544C  LEU*     4.3     4.9    -      -       +      -
   2547C  HIS*     3.6    12.7    -      +       -      -
   2600C  EST      5.4     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU2384 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2382C  ALA      3.3     0.4    -      -       -      -
   2383C  TRP*     1.3   115.5    -      -       +      +
   2385C  GLU*     1.3    63.7    +      -       -      +
   2387C  LEU*     3.0    10.5    +      -       +      +
   2388C  MET*     2.9    44.8    +      -       +      +
   2518C  SER*     3.1    39.0    -      -       -      +
   2521C  GLY      3.8     7.4    -      -       -      +
   2522C  MET*     3.6    28.5    -      -       +      +
   2600C  EST      4.3    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU2385 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1512B  SER*     4.2     2.8    +      -       -      -
   2381C  CYS      4.2     2.8    -      -       -      +
   2382C  ALA*     2.9    16.3    +      -       -      +
   2384C  LEU*     1.3    77.4    -      -       -      +
   2386C  ILE*     1.3    60.2    +      -       -      +
   2388C  MET*     3.9     1.1    +      -       -      -
   2389C  ILE      3.5    12.0    +      -       -      -
   2452C  ILE*     3.6    21.6    -      -       +      +
   2456C  SER*     2.6    35.5    +      -       -      -
   2511C  LEU*     4.3     3.6    -      -       -      +
   2514C  ILE*     3.5    37.3    -      -       +      +
   2515C  ARG*     2.8    42.5    +      -       -      +
   2518C  SER*     3.4    18.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE2386 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2357C  MET*     3.2    28.7    -      -       +      -
   2360C  TRP*     3.9    13.5    -      -       +      -
   2379C  LEU*     5.2     1.1    -      -       +      +
   2382C  ALA      2.9    22.9    +      -       -      +
   2383C  TRP*     3.6     1.1    -      -       -      +
   2385C  GLU*     1.3    73.5    -      -       -      +
   2387C  LEU*     1.3    67.6    +      -       -      +
   2388C  MET      2.8     3.8    +      -       -      -
   2389C  ILE*     3.0    25.1    +      -       -      +
   2390C  GLY*     3.3     3.8    +      -       -      -
   2449C  LYS*     3.9    37.0    -      -       +      +
   2452C  ILE*     3.7    18.6    -      -       +      -
   2453C  LEU*     3.9    36.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU2387 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2350C  ALA*     4.0    21.8    -      -       +      +
   2353C  GLU*     3.2    43.6    -      -       +      +
   2354C  LEU*     3.9     9.4    -      -       +      +
   2357C  MET*     3.5    13.1    -      -       +      +
   2383C  TRP*     2.9    47.6    +      -       +      +
   2384C  LEU*     3.4    17.0    -      -       +      +
   2386C  ILE*     1.3    75.8    -      -       -      +
   2388C  MET*     1.3    59.5    +      -       -      +
   2390C  GLY*     3.9     1.3    +      -       -      -
   2391C  LEU      3.4    12.0    +      -       -      -
   2394C  ARG*     4.1     1.0    +      -       -      -
   2600C  EST      3.3    35.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET2388 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2384C  LEU*     2.9    32.2    +      -       +      +
   2385C  GLU      4.2     4.0    -      -       -      +
   2386C  ILE      2.8     3.4    +      -       -      -
   2387C  LEU*     1.3    71.4    -      -       -      +
   2389C  ILE*     1.3    66.4    +      -       -      +
   2390C  GLY      3.0     1.7    +      -       -      -
   2391C  LEU*     3.1     6.7    +      -       -      +
   2392C  VAL*     2.9    28.8    +      -       +      +
   2424C  ILE*     4.5     8.1    -      -       +      -
   2428C  LEU*     4.1    13.9    -      -       +      -
   2514C  ILE*     4.6     7.2    -      -       +      +
   2517C  MET*     3.4    45.8    -      -       +      +
   2518C  SER*     3.6    13.5    -      -       -      -
   2521C  GLY*     4.1     1.3    -      -       -      -
   2600C  EST      3.6    50.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE2389 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2385C  GLU      3.5     9.4    +      -       -      +
   2386C  ILE*     3.0    22.6    +      -       +      +
   2388C  MET*     1.3    77.9    -      -       -      +
   2390C  GLY*     1.3    65.3    +      -       -      +
   2392C  VAL*     3.7     6.9    +      -       -      +
   2393C  TRP*     3.1    21.7    +      -       -      +
   2431C  THR*     6.5     0.2    -      -       -      -
   2435C  PHE*     4.1    16.0    -      -       +      -
   2445C  PHE*     3.5    18.8    -      -       +      -
   2448C  LEU*     3.6    31.0    -      -       +      -
   2449C  LYS*     3.8    22.7    -      -       +      +
   2452C  ILE*     3.9    16.8    -      -       +      -
   2511C  LEU*     4.8     0.7    -      -       +      -
   2514C  ILE*     4.0    23.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY2390 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2386C  ILE      3.3     6.1    +      -       -      -
   2387C  LEU      4.2     1.1    -      -       -      -
   2388C  MET      3.0     0.8    -      -       -      -
   2389C  ILE*     1.3    82.5    -      -       -      +
   2391C  LEU*     1.3    57.2    +      -       -      +
   2393C  TRP*     2.6    25.0    +      -       -      +
   2394C  ARG*     2.8    29.3    +      -       -      +
   2445C  PHE*     3.8    18.2    -      -       -      -
   2449C  LYS*     5.7     3.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU2391 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2387C  LEU      3.4     9.2    +      -       -      +
   2388C  MET      3.1     6.4    +      -       -      +
   2390C  GLY*     1.3    71.7    -      -       -      +
   2392C  VAL*     1.3    57.4    +      -       -      +
   2394C  ARG*     3.0    29.8    +      -       -      +
   2395C  SER*     2.7    32.3    +      -       -      +
   2402C  LEU*     4.1    10.5    -      -       +      -
   2403C  LEU      3.7     2.7    -      -       -      -
   2404C  PHE*     3.6    58.1    -      -       +      +
   2428C  LEU*     3.4    35.7    -      -       +      -
   2600C  EST      3.6    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL2392 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2388C  MET*     2.9    22.8    +      -       +      +
   2389C  ILE*     3.7     7.9    -      -       -      +
   2391C  LEU*     1.3    73.6    -      -       +      +
   2393C  TRP*     1.3    64.6    +      -       -      +
   2395C  SER*     3.1    13.4    +      -       -      -
   2396C  MET*     3.1    12.6    +      -       -      +
   2402C  LEU*     5.4     0.9    -      -       +      -
   2428C  LEU*     3.7    37.2    -      -       +      +
   2431C  THR*     3.6    15.5    -      -       +      -
   2432C  SER*     3.3    35.4    +      -       -      +
   2435C  PHE*     3.6    21.1    -      -       +      -
   2514C  ILE*     6.5     0.2    -      -       +      -
   2517C  MET*     5.4     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP2393 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2389C  ILE      3.1    14.9    +      -       -      +
   2390C  GLY*     2.6    16.5    +      -       -      +
   2392C  VAL*     1.3    68.0    -      -       -      +
   2394C  ARG*     1.3    65.5    +      -       +      -
   2395C  SER      2.9     9.6    +      -       -      -
   2396C  MET*     3.1    35.8    +      -       +      +
   2435C  PHE*     4.6     4.7    -      +       +      -
   2440C  LEU*     3.0    47.3    -      -       +      -
   2442C  GLY*     3.0    43.3    -      -       -      -
   2445C  PHE*     3.6    46.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG2394 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   2326C  ILE*     3.3    37.5    -      -       +      +
   2353C  GLU*     3.5    19.2    +      -       -      -
   2387C  LEU      4.1     0.6    +      -       -      -
   2390C  GLY*     2.8    25.2    +      -       -      +
   2391C  LEU*     3.0    29.4    +      -       -      +
   2393C  TRP*     1.3    84.3    -      -       +      +
   2395C  SER*     1.3    58.9    +      -       -      +
   2396C  MET      3.6     0.2    -      -       -      -
   2398C  HIS*     4.2     4.3    +      -       -      -
   2403C  LEU*     3.1    48.4    +      -       +      +
   2404C  PHE      3.1    21.5    +      -       -      -
   2600C  EST      2.9    28.9    +      -       -      -
----------------------------------------------------------
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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