6u5t

Electron cryomicroscopy Structure of S. cerevisiae FAS in the Apo stateElectron cryomicroscopy Structure of S. cerevisiae FAS in the Apo state

6u5t, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Structural highlights 6u5t is a 2 chain structure with sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [FAS1_YEAST] Fatty acid synthetase catalyzes the formation of long-chain fatty acids from acetyl-CoA, malonyl-CoA and NADPH. The beta subunit contains domains for: [acyl-carrier-protein] acetyltransferase and malonyltransferase, S-acyl fatty acid synthase thioesterase, enoyl-[acyl-carrier-protein] reductase, and 3-hydroxypalmitoyl-[acyl-carrier-protein] dehydratase. Publication Abstract from PubMed During fatty acid biosynthesis, acyl carrier proteins (ACPs) from type I fungal fatty acid synthase (FAS) shuttle substrates and intermediates within a reaction chamber that hosts multiple spatially-fixed catalytic centers. A major challenge in understanding the mechanism of ACP-mediated substrate shuttling is experimental observation of its transient interaction landscape within the reaction chamber. Here, we have shown that ACP spatial distribution is sensitive to the presence of substrates in a catalytically inhibited state, which enables high-resolution investigation of the ACP-dependent conformational transitions within the enoyl reductase (ER) reaction site. In two fungal FASs with distinct ACP localization, the shuttling domain is targeted to the ketoacyl-synthase (KS) domain and away from other catalytic centers, such as acetyl-transferase (AT) and ER domains by steric blockage of the KS active site followed by addition of substrates. These studies strongly suggest that acylation of phosphopantetheine arm of ACP may be an integral part of the substrate shuttling mechanism in type I fungal FAS. Electron cryomicroscopy observation of acyl carrier protein translocation in type I fungal fatty acid synthase.,Lou JW, Iyer KR, Hasan SMN, Cowen LE, Mazhab-Jafari MT Sci Rep. 2019 Sep 10;9(1):12987. doi: 10.1038/s41598-019-49261-3. PMID:31506493 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.