Contacts of the helix formed by residues 248 - 274 (chain A) in PDB entry 5AVL


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 GLU 248 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ARG*     1.3    77.1    -      -       -      +
    249A  ALA*     1.3    65.5    +      -       -      +
    250A  ARG      3.1     2.0    +      -       -      -
    251A  GLN*     3.3     8.5    +      -       +      +
    252A  GLN*     3.0    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 249 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ARG*     5.0     2.9    -      -       -      +
    248A  GLU*     1.3    77.4    -      -       -      +
    250A  ARG*     1.3    54.3    +      -       -      +
    252A  GLN*     3.5     7.5    +      -       -      +
    253A  ARG*     3.0    51.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 250 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ARG*     3.2    52.0    +      -       +      +
    248A  GLU      3.1     0.2    -      -       -      -
    249A  ALA*     1.3    75.8    -      -       -      +
    251A  GLN*     1.3    60.8    +      -       -      +
    253A  ARG*     3.5    20.9    +      -       -      +
    254A  PHE*     3.2    26.5    +      -       -      +
    327A  ALA      3.5    16.0    +      -       -      -
    328A  LYS*     3.9    21.9    +      -       -      +
    330A  GLY*     3.5    17.8    +      -       -      -
    331A  LEU      5.4     0.2    +      -       -      -
    431A  GLN*     5.2     3.2    -      -       -      +
    433A  LYS*     3.2    32.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 251 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    247A  ARG*     3.8     9.4    +      -       -      +
    248A  GLU*     3.3    10.7    +      -       +      +
    250A  ARG*     1.3    79.1    -      -       +      +
    252A  GLN*     1.3    59.6    +      -       -      +
    254A  PHE*     3.4    27.8    -      -       -      -
    255A  ALA*     3.1    26.9    +      -       -      +
    432A  ASP      4.2     5.9    +      -       -      +
    433A  LYS*     3.4    32.4    -      -       -      +
    434A  LYS      4.7     8.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 252 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236A  THR*     5.8    13.2    -      -       +      +
    237A  PRO*     5.9     4.9    -      -       -      +
    248A  GLU      3.0    16.7    +      -       -      +
    249A  ALA*     3.9     7.9    -      -       -      +
    250A  ARG      3.3     0.2    -      -       -      -
    251A  GLN*     1.3    76.2    -      -       -      +
    253A  ARG*     1.3    58.8    +      -       -      +
    255A  ALA*     3.1     8.8    +      -       +      +
    256A  HIS*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 253 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238A  TRP*     3.6    49.7    -      -       +      -
    249A  ALA*     3.0    38.0    +      -       -      +
    250A  ARG*     3.5    27.8    +      -       -      +
    252A  GLN*     1.3    70.8    -      -       -      +
    254A  PHE*     1.3    65.6    +      -       -      +
    256A  HIS*     3.5     5.2    +      -       -      +
    257A  PHE*     3.4    21.1    +      -       -      +
    328A  LYS*     3.0    63.2    +      -       -      +
    329A  ALA*     4.2     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 254 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250A  ARG      3.2    15.0    +      -       -      +
    251A  GLN*     3.4    31.4    -      -       -      +
    253A  ARG*     1.3    77.9    -      -       -      +
    255A  ALA*     1.3    67.5    +      -       +      +
    257A  PHE*     3.2     4.4    +      -       +      +
    258A  THR*     3.0    43.7    +      -       +      +
    329A  ALA*     3.4    25.6    +      -       -      +
    330A  GLY*     4.4     4.5    -      -       -      -
    331A  LEU*     5.4     0.2    -      -       +      -
    428A  LEU*     4.2    12.3    -      -       +      -
    433A  LYS*     4.2    28.9    -      -       +      +
    434A  LYS      3.7    25.1    -      -       -      -
    435A  LEU*     4.3     9.0    -      -       +      -
    436A  PRO*     5.3     0.7    -      -       +      -
    501A  4KQ      3.7    27.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with ALA 255 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236A  THR*     5.7     0.9    -      -       -      +
    251A  GLN*     3.1    13.7    +      -       -      +
    252A  GLN*     3.1    15.5    +      -       +      +
    254A  PHE*     1.3    82.9    -      -       +      +
    256A  HIS*     1.3    56.6    +      -       -      +
    258A  THR*     2.7    23.2    +      -       -      +
    259A  GLU*     3.0    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 256 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  VAL*     3.6    23.3    -      -       +      +
    236A  THR*     2.9    38.0    +      -       -      +
    237A  PRO      3.4    17.3    -      -       -      +
    238A  TRP*     3.7    24.8    -      +       +      +
    252A  GLN      2.9    14.6    +      -       -      +
    253A  ARG*     4.0     4.9    -      -       -      +
    254A  PHE      3.4     0.2    -      -       -      -
    255A  ALA*     1.3    74.3    -      -       -      +
    257A  PHE*     1.3    60.4    -      -       -      +
    259A  GLU*     3.7     7.5    +      -       -      +
    260A  LEU*     3.3    27.9    +      -       +      +
    319A  PHE*     4.4    21.4    -      +       -      -
    321A  TYR*     3.1    28.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 257 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238A  TRP*     5.6     0.2    -      -       +      -
    253A  ARG      3.4    10.1    +      -       -      +
    254A  PHE*     3.2    10.0    +      -       +      +
    255A  ALA      3.1     0.4    -      -       -      -
    256A  HIS*     1.3    75.9    -      -       +      +
    258A  THR*     1.3    65.9    +      -       -      +
    260A  LEU*     3.3    18.4    +      -       +      +
    261A  ALA      3.3     8.5    +      -       -      -
    315A  PHE*     4.1     8.5    -      +       -      -
    321A  TYR*     3.8    35.0    -      +       -      -
    326A  PHE*     3.9    31.2    -      +       -      -
    329A  ALA*     3.6    25.8    -      -       +      +
    331A  LEU*     3.8    28.3    -      -       +      -
    501A  4KQ      3.3    56.5    -      +       +      +
----------------------------------------------------------
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Residues in contact with THR 258 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254A  PHE*     3.0    43.4    +      -       +      +
    255A  ALA*     2.7    25.3    +      -       -      -
    257A  PHE*     1.3    74.3    -      -       -      +
    259A  GLU*     1.3    58.0    +      -       -      +
    261A  ALA*     3.4     1.1    +      -       -      -
    262A  ILE*     3.0    32.4    +      -       -      +
    435A  LEU*     4.7     0.9    -      -       +      -
    436A  PRO*     3.8    24.0    -      -       +      +
    439A  LEU*     3.5    17.4    -      -       +      +
    501A  4KQ      3.9    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 259 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  VAL*     4.0    14.8    -      -       +      +
    236A  THR*     2.8    39.5    +      -       -      +
    255A  ALA*     3.0    27.4    +      -       -      +
    256A  HIS*     3.8     6.3    -      -       -      +
    257A  PHE      3.2     0.2    -      -       -      -
    258A  THR*     1.3    77.1    +      -       -      +
    260A  LEU*     1.3    64.5    +      -       -      +
    262A  ILE*     3.2    16.9    +      -       +      +
    263A  VAL*     3.0    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 260 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  VAL*     4.6    17.0    -      -       +      -
    256A  HIS*     3.3    22.1    +      -       +      +
    257A  PHE*     3.3    15.6    +      -       +      +
    259A  GLU*     1.3    76.9    -      -       -      +
    261A  ALA*     1.3    59.0    +      -       -      +
    263A  VAL*     3.5     9.0    +      -       +      +
    264A  SER*     2.9    26.9    +      -       -      -
    315A  PHE*     4.5    10.8    -      -       +      -
    316A  LEU*     3.6    31.9    -      -       +      -
    319A  PHE*     5.5     4.9    -      -       +      -
    321A  TYR*     3.7    29.4    -      -       +      +
    501A  4KQ      3.6    32.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 261 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257A  PHE      3.3     3.6    +      -       -      +
    258A  THR      3.6     8.1    -      -       -      +
    259A  GLU      3.3     0.4    -      -       -      -
    260A  LEU*     1.3    75.1    -      -       -      +
    262A  ILE*     1.3    55.8    +      -       -      +
    264A  SER*     2.9     3.5    +      -       -      -
    265A  VAL*     2.8    36.7    +      -       -      +
    298A  MET*     3.4    15.5    -      -       +      +
    439A  LEU*     3.8    19.7    -      -       +      -
    443A  TRP*     4.4     2.2    -      -       +      -
    501A  4KQ      3.5    37.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 262 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  THR*     3.0    20.1    +      -       -      +
    259A  GLU*     3.2    21.3    +      -       +      +
    261A  ALA*     1.3    75.2    -      -       -      +
    263A  VAL*     1.3    63.5    +      -       +      +
    265A  VAL*     3.2    13.2    +      -       -      +
    266A  GLN*     3.0    30.9    +      -       -      +
    436A  PRO*     3.7    26.7    -      -       +      -
    438A  LEU*     3.9    25.4    -      -       +      +
    439A  LEU*     3.9    19.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 263 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  VAL*     4.4    22.2    -      -       +      -
    259A  GLU*     3.0    18.3    +      -       +      +
    260A  LEU*     3.5    13.0    -      -       +      +
    262A  ILE*     1.3    75.8    -      -       +      +
    264A  SER*     1.3    65.3    +      -       -      +
    266A  GLN*     3.1    26.8    +      -       -      +
    267A  GLU*     3.1    27.9    +      -       +      +
    316A  LEU*     5.3    13.2    -      -       +      -
    501A  4KQ      5.5     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 264 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  LEU      2.9    16.1    +      -       -      -
    261A  ALA      2.9     8.2    +      -       -      -
    263A  VAL*     1.3    77.7    -      -       -      +
    265A  VAL*     1.3    62.5    +      -       -      +
    267A  GLU*     2.9    13.0    +      -       -      +
    268A  ILE*     2.9    34.7    +      -       -      +
    298A  MET*     3.5    22.0    -      -       -      +
    301A  GLU*     5.4     3.6    -      -       -      +
    501A  4KQ      3.6    32.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 265 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  ALA      2.8    21.4    +      -       -      +
    262A  ILE      3.2     7.2    +      -       -      +
    264A  SER*     1.3    73.0    -      -       -      +
    266A  GLN*     1.3    62.2    +      -       -      +
    268A  ILE*     3.2    10.0    +      -       +      +
    269A  VAL*     3.0    28.1    +      -       +      +
    294A  ALA*     5.0     6.1    -      -       +      -
    298A  MET*     3.5    18.3    -      -       +      +
    438A  LEU*     3.8    29.2    -      -       +      -
    439A  LEU*     4.0    11.9    -      -       +      -
    442A  ILE*     4.0    22.0    -      -       +      -
    690B  LEU*     4.5     7.9    -      -       +      -
    693B  LEU*     4.4     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 266 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262A  ILE*     3.0    42.7    +      -       -      +
    263A  VAL*     3.1    17.3    +      -       +      +
    265A  VAL*     1.3    75.0    -      -       -      +
    267A  GLU*     1.3    58.0    +      -       +      +
    269A  VAL*     3.2     4.2    +      -       -      +
    270A  ASP*     3.0    38.8    +      -       -      +
    438A  LEU*     5.1     1.3    -      -       +      -
    693B  LEU*     3.8    38.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 267 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263A  VAL*     3.1    26.8    +      -       +      +
    264A  SER*     2.9    13.4    +      -       -      +
    266A  GLN*     1.3    76.3    -      -       +      +
    268A  ILE*     1.3    52.6    +      -       +      +
    270A  ASP*     3.3     9.6    +      -       -      +
    271A  PHE*     2.8    35.9    +      -       -      +
    301A  GLU*     5.6     3.5    -      -       -      +
    305A  ARG*     5.8     0.3    +      -       -      -
    316A  LEU*     6.0     1.6    -      -       -      +
    501A  4KQ      4.4    22.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 268 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264A  SER*     2.9    38.6    +      -       -      +
    265A  VAL*     3.5    12.1    -      -       +      +
    267A  GLU*     1.3    70.2    -      -       +      +
    269A  VAL*     1.3    59.9    +      -       +      +
    271A  PHE*     3.7     8.5    -      -       +      +
    272A  ALA*     3.0    27.4    +      -       -      +
    290A  LEU*     4.0    20.0    -      -       +      -
    293A  SER*     5.2     0.2    -      -       -      +
    294A  ALA*     3.6    38.4    -      -       +      +
    297A  VAL*     3.8    37.0    -      -       +      -
    298A  MET*     4.0     5.2    -      -       +      +
    301A  GLU*     6.1     0.7    -      -       +      -
    364A  ILE*     4.9     4.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 269 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265A  VAL*     3.0    19.4    +      -       +      +
    266A  GLN      3.2     7.8    +      -       -      +
    268A  ILE*     1.3    72.6    -      -       +      +
    270A  ASP*     1.3    71.3    -      -       -      +
    272A  ALA*     2.9    12.5    +      -       -      +
    273A  LYS*     2.9    32.4    +      -       -      +
    290A  LEU*     3.9    13.9    -      -       +      -
    690B  LEU*     3.8    29.6    -      -       +      -
    693B  LEU*     3.8    30.7    -      -       +      +
    694B  LEU*     3.8    21.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 270 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    266A  GLN*     3.0    28.4    +      -       -      +
    267A  GLU*     3.6     8.0    -      -       -      +
    269A  VAL*     1.3    81.0    -      -       -      +
    271A  PHE*     1.3    61.7    +      -       -      +
    273A  LYS*     3.3    26.1    +      -       -      +
    274A  GLN*     3.3    20.9    +      -       -      +
    693B  LEU      5.3     0.7    -      -       -      +
    696B  GLU*     5.7     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 271 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  LEU*     3.6    22.9    -      -       +      -
    220A  ALA*     4.0    18.6    -      -       +      +
    221A  GLN*     3.5    41.7    -      -       +      -
    267A  GLU      2.8    20.4    +      -       -      +
    268A  ILE*     3.7     8.7    -      -       -      +
    269A  VAL      3.2     0.2    -      -       -      -
    270A  ASP*     1.3    73.1    -      -       -      +
    272A  ALA*     1.3    62.8    +      -       -      +
    274A  GLN*     3.2    21.0    +      -       -      +
    275A  LEU*     3.4    32.8    +      -       +      +
    357A  ALA*     4.1    18.2    -      -       +      -
    360A  ILE*     3.6    30.5    -      -       +      -
    361A  ALA      4.5     0.7    -      -       -      -
    364A  ILE*     4.2     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 272 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  ILE      3.0    16.7    +      -       -      +
    269A  VAL*     2.9     6.9    +      -       -      +
    271A  PHE*     1.3    71.7    -      -       -      +
    273A  LYS*     1.3    58.8    +      -       -      +
    274A  GLN      3.0     4.7    -      -       -      -
    275A  LEU*     2.9    31.5    +      -       +      +
    278A  PHE*     3.2    52.8    -      -       +      +
    290A  LEU*     3.8    12.3    -      -       +      -
    364A  ILE*     4.6     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 273 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    269A  VAL*     2.9    26.3    +      -       -      +
    270A  ASP*     3.6    23.1    +      -       -      +
    271A  PHE      3.2     0.2    -      -       -      -
    272A  ALA*     1.3    77.9    -      -       -      +
    274A  GLN*     1.3    58.8    +      -       +      +
    275A  LEU      3.8     3.6    +      -       -      +
    278A  PHE*     4.4     1.6    -      -       -      -
    279A  LEU*     3.3    49.7    +      -       +      +
    693B  LEU      3.6    20.6    +      -       -      -
    694B  LEU*     3.7    25.5    +      -       +      +
    696B  GLU*     3.2    33.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 274 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  LYS*     3.3    31.8    +      -       -      +
    217A  LEU*     4.8     3.8    -      -       +      +
    220A  ALA*     4.1    35.2    +      -       +      +
    270A  ASP      3.3    17.3    -      -       -      +
    271A  PHE      3.4     8.1    -      -       -      +
    272A  ALA      3.0     0.4    -      -       -      -
    273A  LYS*     1.3    78.9    -      -       +      +
    275A  LEU*     1.3    62.0    +      -       -      +
    276A  PRO*     3.3     9.7    -      -       -      +
----------------------------------------------------------
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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