6l3m

Crystal Structure of the acyltransferase domain from the third module of the ansamitocin polyketide synthase

spinqualitylabelsall models 6l3m, resolution 1.77Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6l3m is a 4 chain structure with sequence from Actinosynnema pretiosum subsp. auranticum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.77Å Ligands: E5U, GOL, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed A few acyltransferase (AT) domains of modular polyketide synthases (PKSs) recruit acyl carrier protein (ACP)-linked extender units with unusual C2 substituents to confer functionalities that are not available in coenzyme A (CoA)-linked ones. Here, an AT specific for methoxymalonyl (MOM)-ACP in the third module of the ansamitocin PKS was structurally and biochemically characterized. The AT uses a conserved tryptophan at the entrance of the substrate binding tunnel to discriminate between different carriers. A W275R mutation switches its carrier specificity from the ACP protein to the CoA molecule. The acyl-AT complex structures clearly show that the MOM-ACP accepted by the AT has the 2S instead of the opposite 2R stereochemistry that is predicted according to the biosynthetic derivation from a D-glycolytic intermediate. Together, these results reveal the structural basis of ATs recognizing ACP-linked extender units in polyketide biosynthesis. Structural and Biochemical insights to the Recruitment of Acyl Carrier Protein-linked Extender Units in Ansamitocin Biosynthesis.,Zhang F, Ji H, Ali I, Deng Z, Bai L, Zheng J Chembiochem. 2019 Nov 27. doi: 10.1002/cbic.201900628. PMID:31777147 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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