5wgc

propionyl-DpsC in complex with oxetane-bearing probe

spinqualitylabelsall models 5wgc, resolution 2.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5wgc is a 2 chain structure with sequence from Streptomyces peucetius. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.15Å Ligands: 42Y, AFY Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q54816_STRPE Publication Abstract from PubMed Polyketides are a large class of bioactive natural products with a wide range of structures and functions. Polyketides are biosynthesized by large, multidomain enzyme complexes termed polyketide synthases (PKSs). One of the primary challenges when studying PKSs is the high reactivity of their poly-beta-ketone substrates. This has hampered structural and mechanistic characterization of PKS-polyketide complexes, and, as a result, little is known about how PKSs position the unstable substrates for proper catalysis while displaying high levels of regio- and stereospecificity. As a first step toward a general plan to use oxetanes as carbonyl isosteres to broadly interrogate PKS chemistry, we describe the development and application of an oxetane-based PKS substrate mimic. This enabled the first structural determination of the acyl-enzyme intermediate of a ketosynthase (KS) in complex with an inert extender unit mimic. The crystal structure, in combination with molecular dynamics simulations, led to a proposed mechanism for the unique activity of DpsC, the priming ketosynthase for daunorubicin biosynthesis. The successful application of an oxetane-based polyketide mimic suggests that this novel class of probes could have wide-ranging applications to the greater biosynthetic community interested in the mechanistic enzymology of iterative PKSs. An Oxetane-Based Polyketide Surrogate To Probe Substrate Binding in a Polyketide Synthase.,Ellis BD, Milligan JC, White AR, Duong V, Altman PX, Mohammed LY, Crump MP, Crosby J, Luo R, Vanderwal CD, Tsai SC J Am Chem Soc. 2018 Apr 10. doi: 10.1021/jacs.7b11793. PMID:29620883 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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