Loading of malonyl-CoA Onto Tandem Acyl Carrier Protein Domains of Polyunsaturated Fatty Acid Synthases

Abstract: Omega-3 polyunsaturated fatty acids (PUFA) are produced in some unicellular organisms, such as marine gammaproteobacteria, myxobacteria, and thraustochytrids, by large enzyme complexes called PUFA synthases. These enzymatic complexes resemble bacterial antibiotic-producing proteins known as polyketide synthases (PKS). One of the PUFA synthase subunits is a conserved large protein (PfaA in marine proteobacteria) that contains three to nine tandem acyl carrier protein (ACP) domains as well as condensation and modification domains. In this work, a study of the PfaA architecture and its ability to initiate the synthesis by selecting malonyl units has been carried out. As a result, we have observed a self-acylation ability in tandem ACPs whose biochemical mechanism differ from the previously described for type II PKS. The acyltransferase domain of PfaA showed a high selectivity for malonyl-CoA that efficiently loads onto the ACPs domains. These results, together with the structural organization predicted for PfaA, suggest that this protein plays a key role at early stages of the anaerobic pathway of PUFA synthesis.

 Fuente: J Biol Chem 2018, 293 (32), 12491-12501

Editorial: American Society for Biochemistry and Molecular Biology Inc.

 Fecha de publicación: 10/08/2018

Nº de páginas: 12

Tipo de publicación: Artículo de Revista

DOI: 10.1074/jbc.RA118.002443

ISSN: 0021-9258,1083-351X

Url de la publicación: https://www.doi.org/10.1074/jbc.RA118.002443