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Structure paper

TitleStructural basis for regulation of human acetyl-CoA carboxylase.
Journal, issue, pagesNature, Vol. 558, Issue 7710, Page 470-474, Year 2018
Publish dateJun 13, 2018
AuthorsMoritz Hunkeler / Anna Hagmann / Edward Stuttfeld / Mohamed Chami / Yakir Guri / Henning Stahlberg / Timm Maier /
PubMed AbstractAcetyl-CoA carboxylase catalyses the ATP-dependent carboxylation of acetyl-CoA, a rate-limiting step in fatty acid biosynthesis. Eukaryotic acetyl-CoA carboxylases are large, homodimeric multienzymes. ...Acetyl-CoA carboxylase catalyses the ATP-dependent carboxylation of acetyl-CoA, a rate-limiting step in fatty acid biosynthesis. Eukaryotic acetyl-CoA carboxylases are large, homodimeric multienzymes. Human acetyl-CoA carboxylase occurs in two isoforms: the metabolic, cytosolic ACC1, and ACC2, which is anchored to the outer mitochondrial membrane and controls fatty acid β-oxidation. ACC1 is regulated by a complex interplay of phosphorylation, binding of allosteric regulators and protein-protein interactions, which is further linked to filament formation. These filaments were discovered in vitro and in vivo 50 years ago, but the structural basis of ACC1 polymerization and regulation remains unknown. Here, we identify distinct activated and inhibited ACC1 filament forms. We obtained cryo-electron microscopy structures of an activated filament that is allosterically induced by citrate (ACC-citrate), and an inactivated filament form that results from binding of the BRCT domains of the breast cancer type 1 susceptibility protein (BRCA1). While non-polymeric ACC1 is highly dynamic, filament formation locks ACC1 into different catalytically competent or incompetent conformational states. This unique mechanism of enzyme regulation via large-scale conformational changes observed in ACC1 has potential uses in engineering of switchable biosynthetic systems. Dissecting the regulation of acetyl-CoA carboxylase opens new paths towards counteracting upregulation of fatty acid biosynthesis in disease.
External linksNature / PubMed:29899443
MethodsEM (single particle)
Resolution4.6 - 5.9 Å
Structure data

4342

6g2d

EMDB-4342, PDB-6g2d:
Citrate-induced acetyl-CoA carboxylase (ACC-Cit) filament at 5.4 A resolution
Method: EM (single particle) / Resolution: 5.4 Å

4343

6g2h

EMDB-4343, PDB-6g2h:
Filament of acetyl-CoA carboxylase and BRCT domains of BRCA1 (ACC-BRCT) core at 4.6 A resolution
Method: EM (single particle) / Resolution: 4.6 Å

4344

6g2i

EMDB-4344, PDB-6g2i:
Filament of acetyl-CoA carboxylase and BRCT domains of BRCA1 (ACC-BRCT) at 5.9 A resolution
Method: EM (single particle) / Resolution: 5.9 Å

Source
  • homo sapiens (human)
KeywordsLIGASE / Filament / Helical / Multienzyme / Biotin-dependent carboxylase

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