Succinyl-CoA:acetate CoA-transferase (AarCH6-N347A) in complex with CoA

Experimental Data Snapshot

  • Resolution: 2.13 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.145 
  • R-Value Observed: 0.147 

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Ligand Structure Quality Assessment 

This is version 1.4 of the entry. See complete history


Functional Dissection of the Bipartite Active Site of the Class I Coenzyme A (CoA)-Transferase Succinyl-CoA:Acetate CoA-Transferase.

Murphy, J.R.Mullins, E.A.Kappock, T.J.

(2016) Front Chem 4: 23-23

  • DOI: https://doi.org/10.3389/fchem.2016.00023
  • Primary Citation of Related Structures:  
    5DDK, 5DW4, 5DW5, 5DW6, 5E5H

  • PubMed Abstract: 

    Coenzyme A (CoA)-transferases catalyze the reversible transfer of CoA from acyl-CoA thioesters to free carboxylates. Class I CoA-transferases produce acylglutamyl anhydride intermediates that undergo attack by CoA thiolate on either the internal or external carbonyl carbon atoms, forming distinct tetrahedral intermediates <3 Å apart. In this study, crystal structures of succinyl-CoA:acetate CoA-transferase (AarC) from Acetobacter aceti are used to examine how the Asn347 carboxamide stabilizes the internal oxyanion intermediate. A structure of the active mutant AarC-N347A bound to CoA revealed both solvent replacement of the missing contact and displacement of the adjacent Glu294, indicating that Asn347 both polarizes and orients the essential glutamate. AarC was crystallized with the nonhydrolyzable acetyl-CoA (AcCoA) analog dethiaacetyl-CoA (1a) in an attempt to trap a closed enzyme complex containing a stable analog of the external oxyanion intermediate. One active site contained an acetylglutamyl anhydride adduct and truncated 1a, an unexpected result hinting at an unprecedented cleavage of the ketone moiety in 1a. Solution studies confirmed that 1a decomposition is accompanied by production of near-stoichiometric acetate, in a process that seems to depend on microbial contamination but not AarC. A crystal structure of AarC bound to the postulated 1a truncation product (2a) showed complete closure of one active site per dimer but no acetylglutamyl anhydride, even with acetate added. These findings suggest that an activated acetyl donor forms during 1a decomposition; a working hypothesis involving ketone oxidation is offered. The ability of 2a to induce full active site closure furthermore suggests that it subverts a system used to impede inappropriate active site closure on unacylated CoA.

  • Organizational Affiliation

    Department of Biochemistry, Purdue University West Lafayette, IN, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetyl-CoA hydrolase
A, B
514Acetobacter aceti 1023Mutation(s): 1 
Gene Names: AZ09_02565
Find proteins for B3EY95 (Acetobacter aceti)
Explore B3EY95 
Go to UniProtKB:  B3EY95
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB3EY95
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on COA

Download Ideal Coordinates CCD File 
E [auth A],
K [auth B]
C21 H36 N7 O16 P3 S
Query on IMD

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A]
C3 H5 N2
Query on CL

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
I [auth B],
J [auth B]
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.103α = 90
b = 109.775β = 90
c = 120.057γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesMCB0936108

Revision History  (Full details and data files)

  • Version 1.0: 2016-05-04
    Type: Initial release
  • Version 1.1: 2016-06-08
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence, Derived calculations
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description