1XPL

Crystal Structure of Staphylococcus aureus HMG-COA Synthase with Acetoacetyl-COA and Acetylated Cysteine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

3-hydroxy-3-methylglutaryl-CoA synthase intermediate complex observed in "real-time"

Theisen, M.J.Misra, I.Saadat, D.Campobasso, N.Miziorko, H.M.Harrison, D.H.T.

(2004) Proc Natl Acad Sci U S A 47: 16442-16447

  • DOI: 10.1073/pnas.0405809101
  • Primary Citation of Related Structures:  
    1XPM, 1XPL, 1XPK

  • PubMed Abstract: 
  • The formation of carbon-carbon bonds via an acyl-enzyme intermediate plays a central role in fatty acid, polyketide, and isoprenoid biosynthesis. Uniquely among condensing enzymes, 3-hydroxy-3-methylglutaryl (HMG)-CoA synthase (HMGS) catalyzes the fo ...

    The formation of carbon-carbon bonds via an acyl-enzyme intermediate plays a central role in fatty acid, polyketide, and isoprenoid biosynthesis. Uniquely among condensing enzymes, 3-hydroxy-3-methylglutaryl (HMG)-CoA synthase (HMGS) catalyzes the formation of a carbon-carbon bond by activating the methyl group of an acetylated cysteine. This reaction is essential in Gram-positive bacteria, and represents the first committed step in human cholesterol biosynthesis. Reaction kinetics, isotope exchange, and mass spectroscopy suggest surprisingly that HMGS is able to catalyze the "backwards" reaction in solution, where HMG-CoA is cleaved to form acetoacetyl-CoA (AcAc-CoA) and acetate. Here, we trap a complex of acetylated HMGS from Staphylococcus aureus and bound acetoacetyl-CoA by cryo-cooling enzyme crystals at three different times during the course of its back-reaction with its physiological product (HMG-CoA). This nonphysiological "backwards" reaction is used to understand the details of the physiological reaction with regards to individual residues involved in catalysis and substrate/product binding. The structures suggest that an active-site glutamic acid (Glu-79) acts as a general base both in the condensation between acetoacetyl-CoA and the acetylated enzyme, and the hydrolytic release of HMG-CoA from the enzyme. The ability to trap this enzyme-intermediate complex may suggest a role for protein dynamics and the interplay between protomers during the normal course of catalysis.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Rosalind Franklin University of Medicine and Science, North Chicago, IL 60064, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
3-hydroxy-3-methylglutaryl CoA synthaseABCD396Staphylococcus aureus subsp. aureusMutation(s): 1 
Gene Names: mvaS
EC: 2.3.3.10
Find proteins for A0A0H3K1U2 (Staphylococcus aureus (strain MW2))
Explore A0A0H3K1U2 
Go to UniProtKB:  A0A0H3K1U2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CAA
Query on CAA

Download CCD File 
A, B, C, D
ACETOACETYL-COENZYME A
C25 H40 N7 O18 P3 S
OJFDKHTZOUZBOS-CITAKDKDSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A, B, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SCY
Query on SCY
A,B,C,DL-PEPTIDE LINKINGC5 H9 N O3 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.327α = 90
b = 118.413β = 90.03
c = 121.632γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
BEASTphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description