Contacts of the helix formed by residues 290 - 316 (chain D) in PDB entry 1U3Q


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 THR 290 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288D  PRO*     4.3     8.1    -      -       +      +
    289D  PHE*     1.3    79.3    -      -       -      +
    291D  GLU*     1.3    68.9    +      -       -      +
    292D  ALA*     2.8     9.8    +      -       -      +
    293D  SER*     2.9    35.0    +      -       -      +
    294D  MET*     3.1    11.8    +      -       -      +
    369D  CYS*     4.3     5.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 291 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290D  THR*     1.3    73.5    -      -       -      +
    292D  ALA*     1.3    61.1    +      -       -      +
    295D  MET*     3.3    24.3    +      -       -      +
    369D  CYS*     3.1    25.9    +      -       -      +
    370D  VAL*     4.0    15.5    -      -       +      +
    371D  GLU*     3.1    35.0    +      -       -      +
    479D  MET*     4.3     6.5    -      -       -      +
    482D  LYS*     5.7     0.3    +      -       -      -
    484D  VAL*     3.7    32.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 292 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290D  THR*     2.8     9.4    +      -       -      +
    291D  GLU*     1.3    77.9    -      -       -      +
    293D  SER*     1.3    60.1    +      -       -      +
    295D  MET*     3.3     3.7    +      -       -      +
    296D  MET*     2.9    31.3    +      -       -      +
    484D  VAL*     4.1    24.3    -      -       +      +
    485D  VAL*     5.0     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 293 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285D  PRO*     4.9     9.9    -      -       -      +
    288D  PRO      4.2     3.2    +      -       -      -
    289D  PHE*     3.4    15.7    -      -       -      -
    290D  THR*     2.9    41.0    +      -       -      +
    292D  ALA*     1.3    73.5    -      -       -      +
    294D  MET*     1.3    56.4    +      -       -      +
    296D  MET*     3.4    10.5    +      -       -      +
    297D  SER*     2.9    30.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 294 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289D  PHE*     3.6    37.5    -      -       +      -
    290D  THR      3.1    13.1    +      -       -      +
    293D  SER*     1.3    75.1    +      -       -      +
    295D  MET*     1.3    59.2    +      -       -      +
    297D  SER*     2.8    22.6    +      -       -      -
    298D  LEU*     2.8    23.6    +      -       +      +
    360D  LEU*     6.1     0.2    -      -       +      -
    362D  LEU*     4.3    14.1    -      -       +      -
    366D  GLU*     3.5    22.4    -      -       -      +
    369D  CYS*     4.9     2.2    -      -       +      -
    370D  VAL*     3.3    30.3    -      -       +      -
    373D  ILE*     3.7    19.1    -      -       +      -
    377D  PHE*     3.5    32.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 295 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291D  GLU      3.3    20.1    +      -       -      +
    292D  ALA      3.3     3.7    +      -       -      +
    294D  MET*     1.3    78.3    -      -       -      +
    296D  MET*     1.3    57.6    +      -       -      +
    298D  LEU*     3.3    21.5    +      -       +      +
    299D  THR*     3.0    35.2    +      -       -      +
    370D  VAL*     3.7    21.8    -      -       +      -
    373D  ILE*     3.3    34.3    -      -       +      -
    475D  HIS*     4.3     0.2    -      -       -      -
    476D  LEU*     5.0     2.9    -      -       -      -
    479D  MET*     3.6    35.0    -      -       +      -
    484D  VAL*     4.3     4.7    -      -       +      -
    485D  VAL*     3.9    21.8    -      -       +      -
    501D  272      4.0    16.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 296 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292D  ALA      2.9    18.8    +      -       -      +
    293D  SER*     3.5    11.0    -      -       -      +
    295D  MET*     1.3    77.3    -      -       -      +
    297D  SER*     1.3    65.9    +      -       -      +
    299D  THR*     3.2     8.4    +      -       -      +
    300D  LYS*     3.0    56.0    +      -       +      +
    485D  VAL*     3.9    12.3    -      -       +      +
    486D  PRO*     5.3     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 297 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282D  ILE*     2.8    39.3    -      -       -      +
    283D  SER      4.7     1.6    +      -       -      -
    285D  PRO*     4.4     8.5    -      -       -      +
    289D  PHE*     3.7    15.2    -      -       -      -
    293D  SER      2.9    20.0    +      -       -      -
    294D  MET*     2.8    13.9    +      -       -      -
    296D  MET*     1.3    82.3    -      -       -      +
    298D  LEU*     1.3    62.7    +      -       -      -
    300D  LYS*     4.5     1.6    -      -       -      -
    301D  LEU*     3.2    13.9    +      -       -      +
    360D  LEU*     4.2    12.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 298 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294D  MET*     2.8    27.4    +      -       +      +
    295D  MET*     3.4    32.1    -      -       +      +
    297D  SER*     1.3    79.5    -      -       -      +
    299D  THR*     1.3    57.6    +      -       -      +
    301D  LEU*     3.2     8.5    +      -       +      +
    302D  ALA*     2.9    27.9    +      -       -      +
    356D  PHE*     3.5    45.5    -      -       +      -
    360D  LEU*     4.8     3.8    -      -       +      -
    362D  LEU*     4.4     7.4    -      -       +      -
    373D  ILE*     3.6    16.6    -      -       +      -
    377D  PHE*     4.9     2.9    -      -       +      -
    501D  272      4.0    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 299 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295D  MET*     3.0    18.9    +      -       -      +
    296D  MET*     3.2    15.6    +      -       -      +
    298D  LEU*     1.3    73.1    -      -       +      +
    300D  LYS*     1.3    64.2    +      -       -      +
    302D  ALA*     4.3     1.8    -      -       -      -
    303D  ASP*     2.9    32.4    +      -       -      +
    476D  LEU*     3.7    30.1    -      -       +      -
    485D  VAL*     3.8    21.4    -      -       +      +
    486D  PRO      4.2     9.6    +      -       -      +
    487D  VAL*     5.0     2.9    -      -       +      -
    491D  LEU*     3.7    21.3    -      -       +      +
    501D  272      5.5     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 300 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282D  ILE*     4.6    15.2    -      -       +      +
    296D  MET*     3.0    46.6    +      -       +      +
    297D  SER      3.7     4.5    -      -       -      +
    299D  THR*     1.3    81.1    +      -       -      +
    301D  LEU*     1.3    60.1    +      -       -      +
    303D  ASP*     4.0     4.5    -      -       -      +
    304D  LYS*     3.0    41.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 301 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280D  VAL*     3.6    37.5    -      -       +      +
    282D  ILE*     4.1    19.2    -      -       +      +
    297D  SER      3.2     9.9    +      -       -      +
    298D  LEU*     3.4     9.4    -      -       +      +
    299D  THR      3.2     0.4    -      -       -      -
    300D  LYS*     1.3    77.7    -      -       -      +
    302D  ALA*     1.3    59.0    +      -       -      +
    304D  LYS*     3.4     2.3    +      -       -      +
    305D  GLU*     2.9    57.4    +      -       -      +
    356D  PHE*     3.6    47.3    -      -       +      +
    360D  LEU*     4.5     2.9    -      -       +      -
    501D  272      3.8    17.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 302 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298D  LEU      2.9    16.3    +      -       -      +
    299D  THR*     3.7     4.5    -      -       -      +
    301D  LEU*     1.3    76.7    -      -       -      +
    303D  ASP*     1.3    51.5    +      -       -      +
    305D  GLU*     3.3     3.5    +      -       -      +
    306D  LEU*     2.7    41.7    +      -       +      +
    335D  TRP*     5.0     1.3    -      -       +      -
    336D  MET*     6.3     0.7    -      -       +      -
    339D  LEU*     4.0    25.7    -      -       +      +
    476D  LEU*     6.1     0.9    -      -       +      -
    491D  LEU*     4.2    21.1    -      -       +      -
    501D  272      4.2    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 303 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299D  THR      2.9    20.7    +      -       -      +
    300D  LYS*     4.0     4.9    -      -       -      +
    302D  ALA*     1.3    73.0    -      -       -      +
    304D  LYS*     1.3    67.1    +      -       +      +
    306D  LEU*     3.4    11.7    +      -       -      +
    307D  VAL*     3.3    28.9    +      -       -      +
    488D  TYR*     5.5     1.4    +      -       -      -
    489D  ASP*     2.8    31.1    +      -       -      +
    490D  LEU*     3.5     4.9    +      -       -      +
    491D  LEU*     3.3    29.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 304 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280D  VAL*     3.8    31.4    -      -       +      +
    281D  LEU      5.0     9.8    +      -       -      +
    282D  ILE*     6.5     0.9    -      -       +      -
    300D  LYS*     3.0    28.6    +      -       +      +
    303D  ASP*     1.3    80.7    -      -       +      +
    305D  GLU*     1.3    63.1    +      -       -      +
    307D  VAL*     3.2    22.4    +      -       -      +
    308D  HIS*     3.4    18.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 305 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280D  VAL*     3.3    25.8    +      -       +      +
    301D  LEU*     2.9    41.3    +      -       +      +
    302D  ALA      3.6     3.4    -      -       -      +
    304D  LYS*     1.3    74.5    -      -       -      +
    306D  LEU*     1.3    67.1    +      -       -      +
    308D  HIS*     2.9     9.0    +      -       -      +
    309D  MET*     2.8    22.8    +      -       -      +
    339D  LEU*     3.7    19.0    -      -       +      +
    346D  ARG*     4.0    17.8    +      -       -      -
    501D  272      2.3    36.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 306 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302D  ALA      2.7    28.0    +      -       -      +
    303D  ASP*     3.6     5.4    -      -       -      +
    305D  GLU*     1.3    71.5    -      -       -      +
    307D  VAL*     1.3    63.2    +      -       -      +
    309D  MET*     3.0    26.5    +      -       +      +
    310D  ILE*     3.3    17.0    +      -       -      +
    335D  TRP*     3.9    27.4    -      -       +      -
    339D  LEU*     5.2     2.5    -      -       +      -
    490D  LEU*     3.6    15.5    -      -       +      -
    491D  LEU*     3.5    50.5    -      -       +      +
    494D  MET*     3.7    33.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 307 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303D  ASP*     3.3    24.9    -      -       -      +
    304D  LYS*     3.2    11.6    +      -       -      +
    305D  GLU      3.1     0.4    -      -       -      -
    306D  LEU*     1.3    76.3    -      -       -      +
    308D  HIS*     1.3    69.4    +      -       +      +
    310D  ILE*     3.7    10.4    +      -       -      +
    311D  SER*     3.6    14.5    +      -       -      +
    489D  ASP*     5.8     0.4    -      -       -      +
    490D  LEU*     3.6    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 308 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277D  PRO*     3.9    23.0    -      -       +      +
    278D  PRO*     4.2    29.3    +      -       +      +
    279D  HIS      5.5     0.8    +      -       -      -
    280D  VAL*     3.7    25.2    -      -       +      +
    304D  LYS*     3.4    24.2    +      -       -      +
    305D  GLU*     2.9     7.0    +      -       -      +
    307D  VAL*     1.3    84.2    -      -       +      +
    309D  MET*     1.3    64.9    +      -       -      +
    311D  SER*     3.1    10.8    +      -       -      -
    312D  TRP*     3.0    20.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 309 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277D  PRO*     5.3     2.4    -      -       -      +
    305D  GLU      2.8    14.7    +      -       -      +
    306D  LEU*     3.0    19.3    +      -       +      +
    308D  HIS*     1.3    72.9    -      -       -      +
    310D  ILE*     1.3    52.4    +      -       +      +
    312D  TRP*     3.1    30.6    -      -       +      +
    313D  ALA*     2.8    32.1    +      -       -      +
    331D  LEU*     4.1    18.2    -      -       +      -
    334D  CYS*     5.7     0.2    -      -       -      -
    335D  TRP*     3.2    50.5    -      -       +      +
    338D  VAL*     3.5    23.1    -      -       +      -
    339D  LEU*     3.9    20.4    -      -       +      -
    494D  MET*     5.2     1.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 310 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306D  LEU      3.5     6.7    -      -       -      +
    307D  VAL*     3.9     7.9    -      -       -      +
    308D  HIS      3.2     0.6    -      -       -      -
    309D  MET*     1.3    76.3    -      -       +      +
    311D  SER*     1.3    63.1    +      -       -      +
    313D  ALA*     3.5     6.6    +      -       -      +
    314D  LYS*     2.8    45.0    +      -       +      +
    319D  PHE*     6.4     0.2    -      -       +      -
    331D  LEU*     4.4    22.9    -      -       +      -
    490D  LEU*     3.5    41.1    -      -       +      -
    494D  MET*     5.5     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 311 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307D  VAL      3.6    12.0    +      -       -      -
    308D  HIS*     3.1     9.8    +      -       -      -
    310D  ILE*     1.3    76.0    -      -       -      +
    312D  TRP*     1.3    68.0    +      -       -      +
    314D  LYS*     3.3    18.1    +      -       -      +
    315D  LYS*     3.3    34.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 312 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272D  LEU*     5.1     6.5    +      -       -      +
    275D  ALA*     3.7    39.3    -      -       +      +
    276D  GLU*     4.1     8.1    +      -       -      -
    277D  PRO*     4.3    17.9    -      -       +      -
    308D  HIS      3.0    13.0    +      -       -      +
    309D  MET*     3.1    37.5    -      -       +      +
    311D  SER*     1.3    76.8    -      -       -      +
    313D  ALA*     1.3    64.1    +      -       +      +
    315D  LYS*     2.8    27.8    +      -       -      +
    316D  ILE*     3.5    25.3    +      -       +      +
    331D  LEU*     5.3     0.2    -      -       +      -
    338D  VAL*     3.9    23.3    -      -       +      -
    398D  LEU*     5.4     1.4    +      -       -      +
    401D  LYS*     3.5    44.3    -      -       +      +
    402D  ALA*     3.8    13.0    -      -       +      -
    405D  LEU*     3.9    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 313 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309D  MET      2.8    19.4    +      -       -      +
    310D  ILE      3.8     5.4    -      -       -      +
    311D  SER      3.4     0.2    -      -       -      -
    312D  TRP*     1.3    73.7    -      -       +      +
    314D  LYS*     1.3    62.3    +      -       -      +
    316D  ILE*     3.0    25.7    +      -       -      +
    319D  PHE*     3.2    33.2    -      -       +      +
    331D  LEU*     3.9    17.9    -      -       +      -
    405D  LEU*     3.7    21.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 314 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310D  ILE*     2.8    36.3    +      -       +      +
    311D  SER*     3.5    12.1    -      -       -      +
    312D  TRP      3.1     0.4    -      -       -      -
    313D  ALA*     1.3    76.3    -      -       -      +
    315D  LYS*     1.3    61.5    +      -       +      +
    316D  ILE      3.5     4.2    +      -       -      +
    319D  PHE*     3.9    15.9    -      -       +      +
    320D  VAL*     3.7    37.4    -      -       +      +
    327D  GLN*     4.9     7.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 315 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271D  THR*     3.9    12.2    -      -       +      +
    274D  GLU      4.8     4.0    -      -       -      +
    275D  ALA*     3.8    38.4    +      -       +      +
    311D  SER*     3.3    34.4    +      -       -      +
    312D  TRP      2.8     9.7    +      -       -      +
    314D  LYS*     1.3    77.4    -      -       +      +
    316D  ILE*     1.3    64.9    +      -       -      +
    317D  PRO*     3.2    10.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 316 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268D  LEU*     5.8     0.4    -      -       +      -
    272D  LEU*     4.2    20.0    -      -       +      -
    275D  ALA*     5.8     0.4    -      -       +      -
    312D  TRP*     3.8    31.0    -      -       +      +
    313D  ALA*     3.0    15.5    +      -       -      +
    314D  LYS      4.1     2.9    -      -       -      +
    315D  LYS*     1.3    76.9    -      -       -      +
    317D  PRO*     1.3    81.8    -      -       +      +
    318D  GLY      3.2     0.7    +      -       -      -
    319D  PHE*     2.9    24.7    +      -       +      +
    320D  VAL*     4.7     0.3    +      -       -      +
    402D  ALA*     4.3     9.6    -      -       +      +
    405D  LEU*     3.4    34.5    -      -       +      -
    406D  LEU*     4.3    12.1    -      -       +      -
    429D  LEU*     4.2    13.0    -      -       +      -
    433D  VAL*     5.0     5.4    -      -       +      -
----------------------------------------------------------
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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