4MOB

Acyl-Coenzyme A thioesterase 12 in complex with ADP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.401 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.161 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for regulation of the human acetyl-CoA thioesterase 12 and interactions with the steroidogenic acute regulatory protein-related lipid transfer (START) domain.

Swarbrick, C.M.Roman, N.Cowieson, N.Patterson, E.I.Nanson, J.Siponen, M.I.Berglund, H.Lehtio, L.Forwood, J.K.

(2014) J.Biol.Chem. 289: 24263-24274

  • DOI: 10.1074/jbc.M114.589408
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Acetyl-CoA plays a fundamental role in cell signaling and metabolic pathways, with its cellular levels tightly controlled through reciprocal regulation of enzymes that mediate its synthesis and catabolism. ACOT12, the primary acetyl-CoA thioesterase ...

    Acetyl-CoA plays a fundamental role in cell signaling and metabolic pathways, with its cellular levels tightly controlled through reciprocal regulation of enzymes that mediate its synthesis and catabolism. ACOT12, the primary acetyl-CoA thioesterase in the liver of human, mouse, and rat, is responsible for cleavage of the thioester bond within acetyl-CoA, producing acetate and coenzyme A for a range of cellular processes. The enzyme is regulated by ADP and ATP, which is believed to be mediated through the ligand-induced oligomerization of the thioesterase domains, whereby ATP induces active dimers and tetramers, whereas apo- and ADP-bound ACOT12 are monomeric and inactive. Here, using a range of structural and biophysical techniques, it is demonstrated that ACOT12 is a trimer rather than a tetramer and that neither ADP nor ATP exert their regulatory effects by altering the oligomeric status of the enzyme. Rather, the binding site and mechanism of ADP regulation have been determined to occur through two novel regulatory regions, one involving a large loop that links the thioesterase domains (Phe(154)-Thr(178)), defined here as RegLoop1, and a second region involving the C terminus of thioesterase domain 2 (Gln(304)-Gly(326)), designated RegLoop2. Mutagenesis confirmed that Arg(312) and Arg(313) are crucial for this mode of regulation, and novel interactions with the START domain are presented together with insights into domain swapping within eukaryotic thioesterases for substrate recognition. In summary, these experiments provide the first structural insights into the regulation of this enzyme family, revealing an alternate hypothesis likely to be conserved throughout evolution.


    Organizational Affiliation

    From the School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, New South Wales 2678, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acyl-coenzyme A thioesterase 12
A
332Homo sapiensMutation(s): 0 
Gene Names: ACOT12 (CACH, CACH1, STARD15)
EC: 3.1.2.1
Find proteins for Q8WYK0 (Homo sapiens)
Go to Gene View: ACOT12
Go to UniProtKB:  Q8WYK0
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
COA
Query on COA

Download SDF File 
Download CCD File 
A
COENZYME A
C21 H36 N7 O16 P3 S
RGJOEKWQDUBAIZ-IBOSZNHHSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ADPIC50: 72900 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.401 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.161 
  • Space Group: I 2 3
Unit Cell:
Length (Å)Angle (°)
a = 138.850α = 90.00
b = 138.850β = 90.00
c = 138.850γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-16
    Type: Initial release
  • Version 1.1: 2014-07-23
    Type: Database references
  • Version 1.2: 2015-04-01
    Type: Database references
  • Version 1.3: 2017-11-15
    Type: Advisory, Refinement description