Contacts of the strand formed by residues 273 - 276 (chain B) in PDB entry 1O9S


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 273 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249B  ARG*     3.9    26.7    -      -       +      +
    250B  ILE      3.2    13.5    -      -       -      +
    251B  THR*     4.4     1.3    -      -       -      +
    252B  HIS*     3.6     3.4    +      -       -      -
    269B  LEU*     3.0    33.6    +      -       +      -
    270B  ASP*     2.7    32.4    +      -       -      +
    272B  GLU*     1.3    86.3    -      -       -      +
    274B  VAL*     1.3    75.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 274 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    248B  VAL      3.5     2.3    -      -       -      +
    249B  ARG*     3.5     0.9    -      -       -      -
    250B  ILE*     2.7    40.5    +      -       +      +
    252B  HIS*     3.5    49.6    -      -       +      +
    255B  VAL*     4.0    18.2    -      -       +      -
    266B  THR*     3.6    17.9    -      -       +      -
    267B  LEU      3.4    19.5    -      -       -      +
    273B  THR*     1.3    76.6    -      -       -      +
    275B  ILE*     1.3    80.2    +      -       -      +
      3L  THR*     4.3     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 275 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245B  TYR*     3.8    25.6    -      -       +      +
    246B  ASN      3.5     7.4    -      -       -      +
    247B  GLY*     3.3    32.8    -      -       -      +
    248B  VAL      3.4     2.9    -      -       -      +
    249B  ARG*     3.6    37.9    -      -       +      +
    265B  ASN      3.5     2.3    -      -       -      +
    266B  THR*     3.4     0.3    -      -       -      -
    267B  LEU*     2.7    41.9    +      -       +      +
    269B  LEU*     3.8    31.9    -      -       +      -
    273B  THR*     4.9     0.4    -      -       +      -
    274B  VAL*     1.3    76.5    -      -       -      +
    276B  ASP*     1.3    60.7    +      -       -      +
    316B  ILE*     5.2     7.6    -      -       +      -
    317B  LYS*     5.6     2.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 276 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201B  ILE*     4.4     0.2    -      -       -      +
    247B  GLY*     3.1     4.6    -      -       -      -
    248B  VAL*     2.8    38.2    +      -       +      -
    250B  ILE*     3.8    20.7    -      -       +      +
    258B  ARG*     3.1    21.7    +      -       -      -
    262B  LEU      4.1     6.2    -      -       -      +
    265B  ASN*     3.3    24.6    +      -       -      +
    266B  THR*     3.4    15.0    -      -       +      +
    274B  VAL      4.0     0.2    -      -       -      -
    275B  ILE*     1.3    75.3    -      -       -      +
    277B  VAL*     1.3    73.3    +      -       -      +
    278B  PRO*     3.3    24.6    -      -       -      +
----------------------------------------------------------
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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