Contacts of the helix formed by residues 538 - 560 (chain J) in PDB entry 4XLN


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 538 (chain J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1016I  ILE*     5.8     0.3    -      -       -      +
    524J  LEU      4.7     0.3    +      -       -      -
    525J  ARG*     3.4    10.9    -      -       -      -
    526J  PRO*     3.2    31.5    +      -       -      +
    537J  THR*     1.3    86.1    +      -       -      +
    539J  ASP*     1.3    65.0    +      -       -      +
    540J  LEU*     3.3     6.7    -      -       -      -
    541J  ASN*     3.3    30.7    +      -       -      +
    542J  ASP*     4.0     4.0    +      -       -      +
    332L  LEU*     3.4     8.6    -      -       -      +
    333L  GLU*     3.8    12.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 539 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537J  THR      4.0     0.2    +      -       -      -
    538J  SER*     1.3    70.0    -      -       -      +
    540J  LEU*     1.3    64.7    +      -       -      +
    541J  ASN      3.1     2.0    -      -       -      -
    542J  ASP*     3.0    10.3    +      -       -      +
    543J  LEU*     2.9    25.9    +      -       -      +
    593J  ASN*     3.9     9.9    +      -       -      -
    598J  ARG*     5.3     4.5    +      -       -      +
    599J  PRO      4.0     2.4    -      -       -      +
    600J  LEU*     3.4    43.4    -      -       +      +
    601J  ARG      3.8     8.5    +      -       -      +
    331L  SER*     3.2    23.7    +      -       -      -
    333L  GLU*     3.1    38.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 540 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    520J  LEU*     3.7    33.2    -      -       +      -
    525J  ARG*     4.2    16.8    -      -       +      -
    538J  SER*     3.3     3.7    -      -       -      -
    539J  ASP*     1.3    79.4    -      -       -      +
    541J  ASN*     1.3    55.4    +      -       -      +
    543J  LEU*     3.4    11.6    +      -       +      +
    544J  TYR*     2.9    61.4    +      -       +      -
    581J  VAL*     4.3     6.7    -      -       +      +
    601J  ARG      4.1     5.7    +      -       -      +
    602J  SER*     4.0    11.0    -      -       -      -
    603J  LEU*     3.8    39.3    -      -       +      +
    606J  ILE*     5.5     9.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 541 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31J  THR*     5.4     3.1    -      -       +      -
     44J  LEU*     3.6    15.9    -      -       +      +
     45J  PHE*     3.4    16.9    -      -       +      -
    525J  ARG*     2.6    59.7    +      -       -      +
    526J  PRO      4.1     0.2    +      -       -      -
    537J  THR*     3.5    14.3    +      -       -      +
    538J  SER*     3.3    31.0    -      -       -      +
    539J  ASP      3.1     0.2    -      -       -      -
    540J  LEU*     1.3    78.9    -      -       -      +
    542J  ASP*     1.3    57.0    +      -       -      +
    544J  TYR      3.6     0.2    +      -       -      -
    545J  ARG*     2.9    29.3    +      -       -      +
    272L  THR*     5.1     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 542 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537J  THR*     4.9     5.0    -      -       -      +
    538J  SER      4.5     5.2    -      -       -      +
    539J  ASP*     3.0    14.9    +      -       -      +
    541J  ASN*     1.3    74.9    -      -       -      +
    543J  LEU*     1.3    66.6    +      -       -      +
    545J  ARG*     3.1    21.2    +      -       -      +
    546J  ARG*     2.9    31.8    +      -       -      +
    593J  ASN*     4.0    23.8    +      -       -      +
    600J  LEU*     3.8    15.0    -      -       +      -
    272L  THR*     3.3    36.2    +      -       -      +
    331L  SER*     6.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 543 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539J  ASP      2.9    18.3    +      -       -      +
    540J  LEU*     3.5    14.6    -      -       +      +
    541J  ASN      3.3     0.2    -      -       -      -
    542J  ASP*     1.3    77.9    -      -       -      +
    544J  TYR*     1.3    63.6    +      -       -      +
    546J  ARG*     3.2     7.9    +      -       -      +
    547J  LEU*     3.0    22.2    +      -       -      +
    577J  ALA*     5.4     0.5    -      -       -      +
    580J  ALA*     3.4    32.9    -      -       +      +
    581J  VAL*     3.9    15.1    -      -       +      +
    584J  ASN*     4.6     0.7    -      -       -      +
    591J  VAL*     3.7    28.5    -      -       +      -
    600J  LEU*     3.6    21.5    -      -       +      +
    601J  ARG      3.8    21.5    -      -       -      +
    602J  SER*     3.9    12.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 544 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1094I  ALA*     4.0    12.0    +      -       -      +
     44J  LEU*     3.6    17.7    -      -       +      -
     93J  ILE*     3.9    22.9    -      -       +      -
    517J  VAL*     4.5     3.8    -      -       +      -
    518J  PRO      2.9    28.7    +      -       -      -
    519J  VAL*     3.8    16.4    -      -       +      -
    520J  LEU*     3.5    16.7    +      -       -      +
    525J  ARG*     4.3    12.8    -      -       -      -
    540J  LEU*     2.9    57.7    +      -       +      +
    543J  LEU*     1.3    72.9    -      -       -      +
    545J  ARG*     1.3    57.3    +      -       -      +
    547J  LEU*     3.2     7.3    +      -       +      +
    548J  ILE*     2.9    40.0    +      -       +      +
    581J  VAL*     3.6    25.9    -      -       +      +
    603J  LEU*     4.3     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 545 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29J  PRO*     3.2    45.1    +      -       +      +
     30J  GLU*     4.9     1.3    -      -       -      +
     31J  THR*     4.9     4.0    -      -       -      -
     44J  LEU*     4.4     8.2    -      -       +      +
    541J  ASN      2.9    18.6    +      -       -      +
    542J  ASP*     3.3    22.5    +      -       -      +
    543J  LEU      3.1     0.4    -      -       -      -
    544J  TYR*     1.3    77.0    -      -       -      +
    546J  ARG*     1.3    62.5    +      -       -      +
    548J  ILE*     3.9     0.6    -      -       -      -
    549J  ASN*     2.9    35.9    +      -       -      +
    221L  GLY      5.3     2.4    +      -       -      -
    268L  ASP      4.9     1.2    +      -       -      -
    269L  GLN*     3.0    41.0    +      -       -      +
    270L  ALA      2.9    26.5    +      -       -      -
    271L  ARG      3.4    14.2    +      -       -      -
    272L  THR*     3.8    23.3    +      -       -      +
    274L  ARG*     6.3     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 546 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    542J  ASP*     2.9    21.9    +      -       -      +
    543J  LEU*     3.8     6.8    -      -       -      +
    545J  ARG*     1.3    80.3    -      -       +      +
    547J  LEU*     1.3    64.3    +      -       -      +
    549J  ASN*     3.3     7.1    -      -       -      +
    550J  ARG*     2.9    56.4    +      -       -      +
    576J  GLU*     5.5     2.2    +      -       -      -
    577J  ALA*     5.0     2.2    -      -       +      +
    591J  VAL*     3.8    32.4    -      -       -      +
    600J  LEU*     6.0     2.9    -      -       -      -
    221L  GLY      5.0     3.7    +      -       -      -
    222L  LEU*     3.9    16.8    -      -       +      +
    223L  SER*     4.2    20.2    -      -       -      +
    226L  ASP*     3.2    23.3    +      -       -      +
    269L  GLN*     4.0    14.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 547 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93J  ILE*     3.9    24.7    -      -       +      -
     95J  LEU*     5.0     7.0    -      -       +      -
    517J  VAL*     4.3    18.2    -      -       +      -
    543J  LEU      3.0    13.3    +      -       -      +
    544J  TYR*     3.3    10.5    -      -       +      +
    546J  ARG*     1.3    77.0    -      -       -      +
    548J  ILE*     1.3    60.8    +      -       -      +
    550J  ARG*     3.2     2.9    +      -       -      +
    551J  ASN*     2.9    26.8    +      -       +      +
    574J  LEU*     3.8    15.9    -      -       +      -
    577J  ALA*     3.9    12.4    -      -       +      +
    578J  VAL*     3.6    39.7    -      -       +      +
    581J  VAL*     3.7    25.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 548 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26J  VAL*     3.4    35.2    -      -       +      +
     27J  GLU*     3.1    26.7    -      -       -      +
     29J  PRO*     4.9     3.1    -      -       +      -
     44J  LEU*     4.0    22.4    -      -       +      -
     93J  ILE*     3.5    38.4    -      -       +      -
    544J  TYR*     2.9    22.6    +      -       +      +
    545J  ARG*     4.1     2.2    -      -       -      +
    547J  LEU*     1.3    72.5    -      -       -      +
    549J  ASN*     1.3    58.0    +      -       -      +
    551J  ASN*     3.5     6.0    -      -       -      +
    552J  ASN*     2.9    39.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 549 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29J  PRO*     3.3    38.9    -      -       -      +
    545J  ARG*     2.9    23.0    +      -       -      +
    546J  ARG      3.3     5.2    -      -       -      +
    548J  ILE*     1.3    77.4    -      -       -      +
    550J  ARG*     1.3    65.9    +      -       +      +
    552J  ASN*     3.7     4.5    -      -       -      +
    553J  ARG*     3.0    28.3    +      -       -      +
    226L  ASP*     6.0     0.2    -      -       -      +
    268L  ASP      5.0     1.9    +      -       -      +
    269L  GLN*     2.9    48.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 550 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546J  ARG*     2.9    36.3    +      -       -      +
    547J  LEU      3.6     4.0    -      -       -      +
    549J  ASN*     1.3    77.1    -      -       +      +
    551J  ASN*     1.3    57.6    +      -       -      +
    553J  ARG*     3.9     8.0    -      -       -      +
    554J  LEU*     2.9    30.6    +      -       -      +
    570J  GLU*     3.2    19.0    -      -       -      +
    573J  MET*     3.1    48.6    +      -       +      +
    574J  LEU*     4.4    11.7    -      -       +      -
    576J  GLU*     3.6    26.5    +      -       -      +
    577J  ALA*     3.7    18.3    -      -       -      +
    223L  SER*     5.4     4.2    -      -       -      -
    225L  LEU*     4.9     2.8    -      -       -      +
    226L  ASP*     3.0    50.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 551 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25J  GLU*     4.9     0.2    +      -       -      -
     93J  ILE*     4.1    11.6    -      -       +      +
     94J  GLU      3.4    16.0    +      -       -      +
     95J  LEU*     3.3    35.1    -      -       +      +
     96J  ALA      3.4     8.0    +      -       -      -
    547J  LEU*     2.9    14.3    +      -       +      +
    548J  ILE*     3.5    10.5    -      -       -      +
    549J  ASN      3.1     0.2    -      -       -      -
    550J  ARG*     1.3    78.5    -      -       -      +
    552J  ASN*     1.3    76.8    +      -       -      +
    554J  LEU*     3.1     5.3    -      -       -      +
    555J  LYS*     2.9    40.9    +      -       -      +
    574J  LEU*     3.7    17.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 552 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27J  GLU*     3.5    36.2    +      -       -      +
     28J  LYS*     5.2     0.6    -      -       -      +
     29J  PRO*     5.1     4.2    -      -       +      +
    548J  ILE*     2.9    29.8    +      -       -      +
    549J  ASN*     3.8     4.5    -      -       -      +
    551J  ASN*     1.3    82.5    +      -       -      +
    553J  ARG*     1.3    66.8    -      -       -      +
    555J  LYS*     3.3    21.4    +      -       -      +
    556J  LYS*     2.9    24.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 553 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    549J  ASN*     3.0    15.9    +      -       -      +
    550J  ARG*     3.9    12.9    -      -       -      +
    552J  ASN*     1.3    73.8    -      -       -      +
    554J  LEU*     1.3    62.9    +      -       -      +
    556J  LYS*     3.1     7.9    +      -       -      +
    557J  LEU*     3.0    43.0    +      -       +      +
    570J  GLU*     2.8    39.6    +      -       -      -
    573J  MET*     3.4     9.7    -      -       -      +
    222L  LEU*     4.6     4.8    -      -       -      +
    226L  ASP*     2.4    42.3    +      -       -      -
    229L  GLN*     3.3    20.9    -      -       -      +
    230L  GLU*     3.3    43.3    -      -       -      +
    233L  GLN*     4.6     3.8    -      -       -      +
    269L  GLN*     5.3     4.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 554 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96J  ALA*     3.7    17.0    -      -       +      +
     97J  THR*     3.6    26.5    -      -       +      -
    550J  ARG      2.9    20.2    +      -       -      +
    551J  ASN*     3.1     6.3    -      -       -      +
    553J  ARG*     1.3    77.0    -      -       -      +
    555J  LYS*     1.3    64.6    +      -       -      +
    557J  LEU*     3.8     4.5    -      -       +      +
    558J  LEU*     2.9    46.8    +      -       +      +
    567J  ILE*     4.3    10.5    -      -       +      +
    570J  GLU*     3.5    31.9    -      -       +      -
    571J  LYS*     4.3     8.3    -      -       +      -
    574J  LEU*     3.6    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 555 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25J  GLU*     4.4    10.9    +      -       -      -
     27J  GLU*     4.0    18.6    +      -       -      +
     94J  GLU      4.6     5.4    +      -       -      +
     95J  LEU      5.7     0.2    -      -       -      -
     96J  ALA*     3.6    24.7    -      -       +      +
    551J  ASN*     2.9    39.4    +      -       -      +
    552J  ASN*     3.3    30.6    +      -       -      +
    554J  LEU*     1.3    72.7    -      -       -      +
    556J  LYS*     1.3    63.2    +      -       -      +
    558J  LEU*     3.5     6.2    -      -       -      +
    559J  ALA*     2.9    28.8    +      -       -      +
    159L  ILE      6.0     0.7    -      -       -      +
    160L  PRO      5.0    16.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 556 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    552J  ASN      2.9    13.8    +      -       -      +
    553J  ARG*     3.3    13.0    -      -       -      +
    554J  LEU      3.1     0.2    -      -       -      -
    555J  LYS*     1.3    78.5    -      -       -      +
    557J  LEU*     1.3    62.9    +      -       -      +
    559J  ALA*     4.1     1.8    -      -       -      +
    560J  GLN*     3.2    21.8    +      -       -      +
    233L  GLN*     4.5    11.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 557 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    553J  ARG*     3.0    44.8    +      -       +      +
    554J  LEU*     3.8     5.4    -      -       +      +
    556J  LYS*     1.3    73.3    -      -       -      +
    558J  LEU*     1.3    57.5    +      -       -      +
    560J  GLN*     3.7     9.5    -      -       -      +
    561J  GLY      3.6     1.4    +      -       -      -
    562J  ALA*     3.1    40.3    +      -       +      +
    566J  ILE*     4.0    22.4    -      -       +      -
    567J  ILE*     3.3    31.7    -      -       +      +
    570J  GLU*     3.6    21.8    -      -       +      +
    229L  GLN*     4.9     3.6    -      -       -      +
    233L  GLN*     3.4    36.3    -      -       +      +
    236L  ILE*     5.0     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 558 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96J  ALA*     4.0    24.5    -      -       +      -
     97J  THR*     5.2     1.6    -      -       +      +
    554J  LEU*     2.9    35.2    +      -       +      +
    555J  LYS*     3.5     4.7    -      -       -      +
    556J  LYS      3.1     0.2    -      -       -      -
    557J  LEU*     1.3    75.0    -      -       -      +
    559J  ALA*     1.3    59.2    +      -       -      +
    560J  GLN      3.0     3.6    -      -       -      -
    561J  GLY*     3.0    21.0    +      -       -      -
    562J  ALA      4.4     0.3    +      -       -      -
    567J  ILE*     3.7    32.8    -      -       +      +
    571J  LYS*     5.1     6.1    -      -       -      -
    151L  LEU*     5.1     3.1    -      -       +      +
    155L  ARG*     4.7    20.9    -      -       -      +
    156L  ILE*     4.9    17.3    -      -       +      +
    159L  ILE*     5.0    13.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 559 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    555J  LYS      2.9    16.1    +      -       -      +
    556J  LYS      4.4     1.6    -      -       -      +
    558J  LEU*     1.3    76.3    -      -       -      +
    560J  GLN*     1.3    60.4    +      -       -      +
    561J  GLY*     3.2     1.0    +      -       -      -
    144L  GLU*     3.9    15.2    -      -       -      +
    147L  ARG*     5.8     0.2    -      -       -      -
    156L  ILE*     4.8    16.6    -      -       -      +
    159L  ILE      5.9     0.6    +      -       -      -
    160L  PRO*     4.6    27.6    -      -       +      +
    164L  GLU*     5.6     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 560 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    556J  LYS      3.2    19.2    +      -       -      +
    557J  LEU*     3.7     7.6    -      -       -      +
    558J  LEU      3.0     0.4    -      -       -      -
    559J  ALA*     1.3    78.5    -      -       -      +
    561J  GLY*     1.3    57.0    +      -       -      +
    562J  ALA*     3.8    12.5    -      -       -      +
    144L  GLU*     5.2     1.1    -      -       -      -
    147L  ARG*     2.7    39.0    +      -       -      +
    199L  ARG*     4.4     7.4    +      -       -      +
    233L  GLN*     3.9    16.9    +      -       -      +
    236L  ILE*     3.3    40.5    -      -       -      +
    237L  ARG*     6.0     4.0    -      -       -      +
    240L  GLU*     4.9     4.9    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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