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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: Journal of Biological Chemistry, 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