Contacts of the helix formed by residues 219 - 244 (chain E) in PDB entry 4LML


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 SER 219 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220D  TYR*     4.0     7.1    -      -       -      +
    221D  GLU*     6.2     1.6    -      -       -      -
    276D  HIS*     4.9     7.6    +      -       -      -
    217E  SER*     3.1    13.5    +      -       -      -
    218E  THR*     1.3    79.0    -      -       -      +
    220E  TYR*     1.3    64.6    +      -       -      +
    221E  GLU*     4.6     3.1    -      -       -      -
    222E  ALA*     3.2    20.3    -      -       -      +
    223E  ASN*     3.1    24.5    +      -       -      +
    275E  GLN*     5.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 220 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213B  THR*     4.3     9.9    +      -       -      +
    214B  ALA*     4.9     2.9    -      -       +      -
    217B  SER*     3.4    31.4    -      -       -      -
    219B  SER*     4.1     3.6    -      -       -      +
    222B  ALA*     3.6    28.7    -      -       +      -
    223B  ASN*     5.2     0.4    -      -       -      -
    226B  LEU*     5.2     3.0    -      -       +      +
    218E  THR      3.6     4.9    +      -       -      -
    219E  SER*     1.3    71.6    -      -       -      +
    221E  GLU*     1.3    63.1    -      -       -      +
    223E  ASN*     2.9    16.6    +      -       -      +
    224E  VAL*     2.9    34.5    +      -       +      +
    272E  VAL*     3.3    32.3    -      -       +      -
    273E  THR*     2.8    34.0    +      -       +      +
    275E  GLN*     5.4     4.5    -      -       -      +
    276E  HIS*     3.4    36.8    -      +       +      +
    279E  LYS*     5.8     1.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 221 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219B  SER*     5.9     1.1    -      -       -      +
    221B  GLU*     3.1    38.1    -      -       +      +
    222B  ALA*     3.5    16.8    -      -       +      +
    225B  THR*     3.4    18.9    +      -       -      -
    221D  GLU*     3.4    32.4    -      -       +      +
    219E  SER*     3.4     3.3    -      -       -      -
    220E  TYR*     1.3    79.0    -      -       -      +
    222E  ALA*     1.3    63.4    +      -       -      +
    224E  VAL*     3.1    24.9    -      -       -      +
    225E  THR*     3.0    32.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 222 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220D  TYR*     4.0    22.0    -      -       +      -
    221D  GLU*     3.5    22.0    +      -       +      +
    224D  VAL*     4.3    11.0    -      -       +      -
    219E  SER*     3.2    24.4    +      -       -      +
    220E  TYR      3.3     0.8    -      -       -      -
    221E  GLU*     1.3    78.8    -      -       -      +
    223E  ASN*     1.3    62.1    +      -       -      +
    225E  THR*     3.6     1.8    +      -       -      -
    226E  LEU*     3.0    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 223 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220D  TYR*     5.2     0.2    -      -       -      -
    214E  ALA*     3.1    30.7    +      -       +      +
    217E  SER*     3.3    33.2    +      -       -      -
    219E  SER      3.1    14.5    +      -       -      +
    220E  TYR*     2.9    10.8    +      -       -      +
    222E  ALA*     1.3    79.9    -      -       -      +
    224E  VAL*     1.3    60.0    +      -       -      +
    226E  LEU*     3.5     5.9    -      -       -      +
    227E  VAL*     3.0    36.3    +      -       -      +
    272E  VAL*     3.5    32.2    -      -       +      +
    275E  GLN*     4.0     9.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 224 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222B  ALA*     4.3     4.5    -      -       +      -
    225B  THR*     3.8    14.8    -      -       +      +
    226B  LEU*     3.5    28.3    -      -       +      -
    220E  TYR*     2.9    47.5    +      -       +      +
    221E  GLU*     3.1    32.8    -      -       -      +
    223E  ASN*     1.3    75.6    -      -       -      +
    225E  THR*     1.3    71.4    +      -       -      +
    227E  VAL*     5.1     2.0    -      -       -      -
    228E  VAL*     3.0    32.8    +      -       +      +
    272E  VAL*     5.3     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 225 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225B  THR*     4.4    13.2    +      -       -      +
    221D  GLU*     3.7     7.0    +      -       -      -
    224D  VAL*     4.5    11.2    -      -       +      -
    225D  THR*     4.4    22.6    +      -       -      +
    228D  VAL*     5.1     6.7    -      -       +      -
    221E  GLU*     3.0    32.8    +      -       -      -
    222E  ALA      3.8     3.8    -      -       -      -
    224E  VAL*     1.3    76.7    -      -       -      +
    226E  LEU*     1.3    66.5    +      -       +      +
    228E  VAL*     5.1     0.7    -      -       -      -
    229E  SER*     3.0    41.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 226 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220D  TYR*     5.7     2.7    -      -       +      +
    224D  VAL*     3.7    35.4    -      -       +      -
    228D  VAL*     4.7    15.4    -      -       +      +
    269D  VAL*     5.8     1.1    -      -       +      -
    210E  ILE*     3.2    40.6    -      -       +      +
    211E  SER*     4.3     6.5    -      -       -      +
    213E  THR*     4.0    16.2    -      -       +      -
    214E  ALA*     4.5     9.2    -      -       +      -
    222E  ALA*     3.0    27.5    +      -       +      +
    223E  ASN*     3.5     9.0    -      -       -      +
    225E  THR*     1.3    79.9    -      -       +      +
    227E  VAL*     1.3    64.6    -      -       -      +
    229E  SER*     3.8     0.7    -      -       -      -
    230E  THR*     2.9    25.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 227 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211E  SER*     3.9    19.5    -      -       -      +
    212E  TRP*     5.8     0.2    -      -       -      -
    214E  ALA*     4.8     6.7    -      -       +      -
    223E  ASN      3.0    21.0    +      -       -      +
    224E  VAL*     4.5     2.0    -      -       -      +
    226E  LEU*     1.3    72.5    -      -       +      +
    228E  VAL*     1.3    58.3    +      -       +      +
    230E  THR*     2.7    19.9    +      -       -      -
    231E  LEU*     3.0    16.5    +      -       +      +
    265E  TYR*     3.6    25.5    -      -       +      +
    268E  ALA*     4.2    15.7    -      -       +      -
    269E  VAL*     3.7    27.8    -      -       +      -
    272E  VAL*     4.6    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 228 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210B  ILE*     4.6    12.1    -      -       +      -
    225B  THR*     5.0     5.2    -      -       +      +
    226B  LEU*     4.4    27.4    -      -       +      -
    229B  SER*     3.3    40.4    -      -       -      +
    230B  THR*     5.3     4.3    -      -       +      -
    224E  VAL*     3.0    20.0    +      -       -      +
    225E  THR      4.4     0.7    -      -       -      +
    227E  VAL*     1.3    78.2    -      -       +      +
    229E  SER*     1.3    62.9    +      -       -      +
    231E  LEU*     2.9    15.0    +      -       +      +
    232E  ALA*     2.9    28.5    +      -       +      +
    269E  VAL*     5.1     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 229 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229B  SER*     5.4     2.1    +      -       -      -
    228D  VAL*     3.4    31.5    -      -       -      +
    232D  ALA*     5.6     5.5    -      -       -      +
    225E  THR*     3.0    28.3    +      -       -      +
    226E  LEU      4.1     0.7    -      -       -      -
    228E  VAL*     1.3    80.0    -      -       -      +
    230E  THR*     1.3    61.1    +      -       -      +
    232E  ALA*     4.0     9.3    -      -       -      +
    233E  ALA*     3.9    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 230 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    228D  VAL*     5.5     5.6    -      -       +      -
    231D  LEU*     6.5     0.4    -      -       +      -
    207E  ILE*     3.4    32.4    -      -       +      +
    210E  ILE*     4.3    14.1    -      -       +      -
    211E  SER*     3.3    19.8    -      -       -      +
    226E  LEU*     2.9    18.1    +      -       +      +
    227E  VAL      2.7    21.0    +      -       -      -
    229E  SER*     1.3    75.7    -      -       -      +
    231E  LEU*     1.3    60.3    +      -       -      +
    232E  ALA      3.2     0.4    -      -       -      -
    233E  ALA*     3.3     5.3    +      -       -      -
    234E  HIS      3.0    23.0    +      -       -      -
    265E  TYR*     3.1    23.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 231 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206B  PHE*     6.5     0.4    -      -       +      -
    207B  ILE*     4.4    17.7    -      -       +      -
    210B  ILE*     3.8    30.3    -      -       +      -
    230B  THR*     6.2     1.8    -      -       +      -
    227E  VAL*     3.0    15.3    +      -       +      +
    228E  VAL*     2.9    17.6    +      -       +      +
    230E  THR*     1.3    77.9    +      -       -      +
    232E  ALA*     1.3    55.8    +      -       -      +
    234E  HIS*     3.2     5.9    +      -       -      +
    235E  ILE*     2.9    40.6    +      -       +      +
    262E  TYR*     4.3    25.6    -      -       +      -
    265E  TYR*     3.2    35.2    -      -       +      -
    269E  VAL*     5.9     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 232 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229B  SER      6.0     1.6    -      -       -      +
    233B  ALA*     6.0     1.6    -      -       +      -
    228E  VAL*     2.9    15.0    +      -       +      +
    229E  SER*     4.0    11.7    -      -       -      +
    231E  LEU*     1.3    76.9    -      -       -      +
    233E  ALA*     1.3    57.7    +      -       -      +
    235E  ILE*     3.1    17.1    +      -       -      +
    236E  ALA*     2.9    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 233 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232D  ALA*     5.6     8.3    -      -       +      -
    235D  ILE*     4.1    25.4    -      -       +      -
    207E  ILE*     3.8    14.4    -      -       +      -
    229E  SER      3.9     8.1    +      -       -      +
    230E  THR*     3.3    10.2    +      -       -      +
    232E  ALA*     1.3    76.5    -      -       -      +
    234E  HIS*     1.3    60.4    +      -       -      +
    236E  ALA*     3.2    10.0    +      -       -      +
    237E  PHE*     2.9    33.9    +      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 234 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204E  MET*     3.8    24.1    -      -       +      -
    207E  ILE*     3.5    11.8    -      -       +      +
    230E  THR      3.0    14.0    +      -       -      +
    231E  LEU*     3.5    16.5    -      -       +      +
    233E  ALA*     1.3    73.6    -      -       -      +
    235E  ILE*     1.3    61.2    +      -       -      +
    237E  PHE*     3.4     3.8    +      -       -      +
    238E  ASN*     2.9    28.8    +      -       -      +
    258E  ILE*     3.2    37.3    +      -       +      +
    261E  ILE*     3.3    36.7    -      -       +      +
    262E  TYR*     3.6    33.5    +      +       -      -
    265E  TYR*     4.3     6.1    -      +       +      +
----------------------------------------------------------
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Residues in contact with ILE 235 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207B  ILE*     4.5     5.2    -      -       +      -
    233B  ALA*     3.6    29.6    -      -       +      -
    236B  ALA*     5.3     7.6    -      -       +      -
    237B  PHE*     4.0    26.9    -      -       +      -
    231E  LEU*     2.9    32.5    +      -       +      +
    232E  ALA*     3.2    15.0    -      -       -      +
    234E  HIS*     1.3    76.8    -      -       -      +
    236E  ALA*     1.3    56.2    +      -       -      +
    238E  ASN*     3.4     1.6    +      -       -      +
    239E  ILE*     2.9    47.7    +      -       +      +
    262E  TYR*     3.6    28.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 236 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235D  ILE*     6.0     2.0    -      -       +      -
    239D  ILE*     4.8    15.9    -      -       +      +
    232E  ALA      2.9    11.5    +      -       -      +
    233E  ALA*     3.3    15.0    -      -       -      +
    235E  ILE*     1.3    78.3    -      -       -      +
    237E  PHE*     1.3    58.0    +      -       +      +
    239E  ILE*     3.2     8.7    +      -       -      +
    240E  LEU*     2.9    29.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 237 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235D  ILE*     3.5    42.8    -      -       +      -
    238D  ASN*     5.0     1.6    -      -       -      -
    239D  ILE*     4.9     9.2    -      -       +      -
    262D  TYR*     4.0     3.4    -      -       -      -
    199E  ASN      3.5    20.6    -      -       -      -
    200E  ILE*     4.0    30.7    -      -       +      -
    203E  PRO*     3.9    23.1    -      -       +      -
    204E  MET*     4.5    24.5    -      -       +      -
    207E  ILE*     4.4    15.3    -      -       +      -
    233E  ALA      2.9    27.2    +      -       -      -
    234E  HIS*     3.8     5.8    -      -       -      +
    236E  ALA*     1.3    71.2    -      -       +      +
    238E  ASN*     1.3    66.4    +      -       -      +
    240E  LEU*     3.2     8.7    +      -       +      +
    241E  VAL*     3.0    30.7    +      -       -      +
    258E  ILE*     4.8     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 238 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198B  PRO      4.6     1.2    -      -       -      +
    199B  ASN*     3.6    24.6    +      -       -      +
    237B  PHE*     5.2     1.6    -      -       -      -
    234E  HIS*     2.9    18.1    +      -       +      +
    235E  ILE      3.4     5.8    -      -       -      +
    237E  PHE*     1.3    75.3    -      -       -      +
    239E  ILE*     1.3    64.4    +      -       -      +
    241E  VAL*     3.4     1.7    +      -       -      +
    242E  GLU*     2.9    55.8    +      -       -      +
    258E  ILE*     3.4    41.9    -      -       +      +
    262E  TYR*     3.7    28.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 239 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236B  ALA*     5.3    11.9    -      -       +      +
    237B  PHE*     5.3     2.7    -      -       +      -
    240B  LEU*     3.7    43.7    -      -       +      -
    235E  ILE*     2.9    39.1    +      -       +      +
    236E  ALA*     3.6     7.2    -      -       -      +
    238E  ASN*     1.3    80.8    -      -       -      +
    240E  LEU*     1.3    63.8    +      -       -      +
    242E  GLU*     3.2    10.9    +      -       -      +
    243E  THR*     2.9    33.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 240 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    239D  ILE*     3.6    44.9    -      -       +      -
    242D  GLU*     4.2    11.7    -      -       -      +
    243D  THR*     4.3    12.1    -      -       -      +
    200E  ILE*     3.9    27.8    -      -       +      -
    236E  ALA      2.9    17.6    +      -       -      +
    237E  PHE*     3.6     7.9    -      -       +      +
    239E  ILE*     1.3    79.0    -      -       -      +
    241E  VAL*     1.3    62.6    +      -       +      +
    243E  THR*     3.6    16.3    +      -       +      -
    244E  ASN*     3.8    17.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 241 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118E  TYR*     4.0    31.1    +      -       +      +
    196E  TYR*     6.5     0.7    -      -       +      -
    200E  ILE*     3.8    40.4    -      -       +      -
    237E  PHE      3.0    17.4    +      -       -      +
    238E  ASN      4.1     2.0    -      -       -      +
    240E  LEU*     1.3    73.7    -      -       +      +
    242E  GLU*     1.3    63.5    +      -       -      +
    243E  THR      3.1     6.3    +      -       -      -
    244E  ASN*     3.3    14.3    +      -       -      +
    245E  LEU*     3.8    16.2    -      -       +      +
    254E  THR*     5.2    11.0    -      -       +      -
    258E  ILE*     5.0    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 242 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199B  ASN*     3.8    25.3    -      -       -      +
    200B  ILE*     3.5    23.8    -      -       -      +
    240B  LEU*     4.2    18.1    -      -       -      +
    238E  ASN*     2.9    36.6    +      -       -      +
    239E  ILE*     3.6     9.7    -      -       -      +
    241E  VAL*     1.3    76.3    -      -       -      +
    243E  THR*     1.3    59.8    +      -       -      +
    245E  LEU*     3.4    18.1    -      -       -      +
    247E  LYS*     3.4    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 243 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240B  LEU*     5.3     5.2    -      -       -      +
     32E  LYS*     3.4    25.7    +      -       -      +
    239E  ILE*     2.9    25.9    +      -       -      +
    240E  LEU*     3.6     9.8    -      -       +      +
    241E  VAL      3.1     0.6    -      -       -      -
    242E  GLU*     1.3    76.4    -      -       -      +
    244E  ASN*     1.3    71.3    +      -       -      +
    245E  LEU      3.1     8.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 244 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  LYS*     5.8     3.6    -      -       -      +
    247D  LYS*     6.3     1.2    -      -       -      +
     31E  ASP*     3.7    14.0    -      -       -      +
     32E  LYS*     3.8     9.9    -      -       -      +
    118E  TYR*     5.2     6.5    -      -       -      +
    240E  LEU*     3.8    16.5    +      -       -      +
    241E  VAL*     3.3    10.2    +      -       -      +
    243E  THR*     1.3    89.5    -      -       -      +
    245E  LEU*     1.3    70.0    +      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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