5JIS

The Crystal Structure of O-acetyl serine sulfhydralase from Brucella abortus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation 3D Report Full Report



Literature

Structure-based mutational studies of O-acetylserine sulfhydrylase reveal the reason for the loss of cysteine synthase complex formation in Brucella abortus

Dharavath, S.Raj, I.Gourinath, S.

(2017) Biochem J 474: 1221-1239

  • DOI: 10.1042/BCJ20161062
  • Primary Citation of Related Structures:  
    5JIS, 5JJC

  • PubMed Abstract: 
  • Cysteine biosynthesis takes place via a two-step pathway in bacteria, fungi, plants and protozoan parasites, but not in humans, and hence, the machinery of cysteine biosynthesis is an opportune target for therapeutics. The decameric cysteine synthase ...

    Cysteine biosynthesis takes place via a two-step pathway in bacteria, fungi, plants and protozoan parasites, but not in humans, and hence, the machinery of cysteine biosynthesis is an opportune target for therapeutics. The decameric cysteine synthase complex (CSC) is formed when the C-terminal tail of serine acetyltransferase (SAT) binds in the active site of O -acetylserine sulfydrylase (OASS), playing a role in the regulation of this pathway. Here, we show that OASS from Brucella abortus (BaOASS) does not interact with its cognate SAT C-terminal tail. Crystal structures of native BaOASS showed that residues Gln96 and Tyr125 occupy the active-site pocket and interfere with the entry of the SAT C-terminal tail. The BaOASS (Q96A-Y125A) mutant showed relatively strong binding ( K d  = 32.4 μM) to BaSAT C-terminal peptides in comparison with native BaOASS. The mutant structure looks similar except that the active-site pocket has enough space to bind the SAT C-terminal end. Surface plasmon resonance results showed a relatively strong (7.3 μM K d ) interaction between BaSAT and the BaOASS (Q96A-Y125A), but no interaction with native BaOASS. Taken together, our observations suggest that the CSC does not form in B. abortus .


    Organizational Affiliation

    School of Life Sciences, Jawaharlal Nehru University, New Delhi - 110067, India sgourinath@mail.jnu.ac.in.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cysteine synthaseABCD350Brucella abortus S19Mutation(s): 0 
Gene Names: BAbS19_I09950
EC: 2.5.1.47
Find proteins for A0A0F6AQU1 (Brucella abortus (strain S19))
Explore A0A0F6AQU1 
Go to UniProtKB:  A0A0F6AQU1
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LLP
Query on LLP
A,B,C,DL-PEPTIDE LINKINGC14 H22 N3 O7 PLYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.794α = 90
b = 104.794β = 90
c = 241.512γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-04-05
    Type: Initial release