4LMB

Crystal structure analysis of O-acetylserine sulfhydrylase CysK2 complexed with cystine from Microcystis aeruginosa 7806

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history. 

Literature

Structural and biochemical analyses of Microcystis aeruginosa O-acetylserine sulfhydrylases reveal a negative feedback regulation of cysteine biosynthesis.

Lu, M., Xu, B.Y., Zhou, K., Cheng, W., Jiang, Y.L., Chen, Y., Zhou, C.Z.

(2014) Biochim.Biophys.Acta 1844: 308-315

  • DOI: 10.1016/j.bbapap.2013.11.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • O-acetylserine sulfhydrylase (OASS) catalyzes the final step of cysteine biosynthesis from O-acetylserine (OAS) and inorganic sulfide in plants and bacteria. Bioinformatics analyses combined with activity assays enabled us to annotate the two putativ ...

    O-acetylserine sulfhydrylase (OASS) catalyzes the final step of cysteine biosynthesis from O-acetylserine (OAS) and inorganic sulfide in plants and bacteria. Bioinformatics analyses combined with activity assays enabled us to annotate the two putative genes of Microcystis aeruginosa PCC 7806 to CysK1 and CysK2, which encode the two 75% sequence-identical OASS paralogs. Moreover, we solved the crystal structures of CysK1 at 2.30Ǻ and cystine-complexed CysK2 at 1.91Ǻ, revealing a quite similar overall structure that belongs to the family of fold-type II PLP-dependent enzymes. Structural comparison indicated a significant induced fit upon binding to the cystine, which occupies the binding site for the substrate OAS and blocks the product release tunnel. Subsequent enzymatic assays further confirmed that cystine is a competitive inhibitor of the substrate OAS. Moreover, multiple-sequence alignment revealed that the cystine-binding residues are highly conserved in all OASS proteins, suggesting that this auto-inhibition of cystine might be a universal mechanism of cysteine biosynthesis pathway.

    Organizational Affiliation: 

    Hefei National Laboratory for Physical Sciences at the Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui 230027, People's Republic of China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cysteine synthase
A
322Microcystis aeruginosa PCC 7806Mutation(s): 0 
EC: 2.5.1.47
Find proteins for A8YBP8 (Microcystis aeruginosa PCC 7806)
Go to UniProtKB:  A8YBP8
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP
Download SDF File 
Download CCD File 
A
PYRIDOXAL-5'-PHOSPHATE
VITAMIN B6 Phosphate
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
CYS
Query on CYS
Download SDF File 
Download CCD File 
A
CYSTEINE
C3 H7 N O2 S
XUJNEKJLAYXESH-REOHCLBHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 99.846α = 90.00
b = 99.846β = 90.00
c = 164.141γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
AMoREphasing
REFMACrefinement
SCALAdata scaling
ADSCdata collection

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2013-07-10 
  • Released Date: 2014-06-04 
  • Deposition Author(s): Lu, M.

Revision History 

  • Version 1.0: 2014-06-04
    Type: Initial release