3IQG

Structure of O-Acetylserine Sulfhydrylase in Complex with Peptide MNWNI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Design of o-acetylserine sulfhydrylase inhibitors by mimicking nature.

Salsi, E.Bayden, A.S.Spyrakis, F.Amadasi, A.Campanini, B.Bettati, S.Dodatko, T.Cozzini, P.Kellogg, G.E.Cook, P.F.Roderick, S.L.Mozzarelli, A.

(2010) J.Med.Chem. 53: 345-356

  • DOI: 10.1021/jm901325e
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The inhibition of cysteine biosynthesis in prokaryotes and protozoa has been proposed to be relevant for the development of antibiotics. Haemophilus influenzae O-acetylserine sulfhydrylase (OASS), catalyzing l-cysteine formation, is inhibited by the ...

    The inhibition of cysteine biosynthesis in prokaryotes and protozoa has been proposed to be relevant for the development of antibiotics. Haemophilus influenzae O-acetylserine sulfhydrylase (OASS), catalyzing l-cysteine formation, is inhibited by the insertion of the C-terminal pentapeptide (MNLNI) of serine acetyltransferase into the active site. Four-hundred MNXXI pentapeptides were generated in silico, docked into OASS active site using GOLD, and scored with HINT. The terminal P5 Ile accounts for about 50% of the binding energy. Glu or Asp at position P4 and, to a lesser extent, at position P3 also significantly contribute to the binding interaction. The predicted affinity of 14 selected pentapeptides correlated well with the experimentally determined dissociation constants. The X-ray structure of three high affinity pentapeptide-OASS complexes were compared with the docked poses. These results, combined with a GRID analysis of the active site, allowed us to define a pharmacophoric scaffold for the design of peptidomimetic inhibitors.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Parma, Italy. andrea.mozzarelli@unipr.it




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cysteine synthase
X
316Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)Mutation(s): 0 
Gene Names: cysK
EC: 2.5.1.47
Find proteins for P45040 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd))
Go to UniProtKB:  P45040
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MNWNI
P
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LLP
Query on LLP
X
L-PEPTIDE LINKINGC14 H22 N3 O7 PLYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.166 
  • Space Group: I 41
Unit Cell:
Length (Å)Angle (°)
a = 112.474α = 90.00
b = 112.474β = 90.00
c = 45.928γ = 90.00
Software Package:
Software NamePurpose
StructureStudiodata collection
REFMACphasing
SCALAdata scaling
MOSFLMdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-08-20 
  • Released Date: 2009-11-17 
  • Deposition Author(s): Roderick, S.L.

Revision History 

  • Version 1.0: 2009-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance