Activity and structure of human acetyl-CoA carboxylase targeted by a specific inhibitor

Sori Jang, Piotr Gornicki, Jasmina Marjanovic, Ethan Bass, Toni P. Iurcotta, Pedro Rodriguez, Jotham Austin, Robert Haselkorn*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We have studied a series of human acetyl-CoA carboxylase (ACC) 1 and ACC2 proteins with deletions and/or Ser to Ala substitutions of the known phosphorylation sites. In vitro dephosphorylation/phosphorylation experiments reveal a substantial level of phosphorylation of human ACCs produced in insect cells. Our results are consistent with AMPK phosphorylation of Ser 29 , Ser 80 , Ser 1,201 , and Ser 1,216 . Phosphorylation of the N-terminal regulatory domain decreases ACC1 activity, while phosphorylation of residues in the ACC central domain has no effect. Inhibition of the activity by phosphorylation is significantly more profound at citrate concentrations below 2 mm. Furthermore, deletion of the N-terminal domain facilitates structural changes induced by citrate, including conversion of ACC dimers to linear polymers. We have also identified ACC2 amino acid mutations affecting specific inhibition of the isozyme by compound CD-017-0191. They form two clusters separated by 60–90 Å: one located in the vicinity of the BC active site and the other one in the vicinity of the ACC1 phosphorylation sites in the central domain, suggesting a contribution of the interface of two ACC dimers in the polymer to the inhibitor binding site.

Original languageEnglish
Pages (from-to)2048-2058
Number of pages11
JournalFEBS Letters
Volume592
Issue number12
DOIs
StatePublished - Jun 2018
Externally publishedYes

Keywords

  • acetyl-CoA carboxylase
  • binding site
  • human
  • inhibitor

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