6b2s
Crystal structure of Xanthomonas campestris OleA H285N
Structural highlights
FunctionOLEA_XANCP Involved in olefin biosynthesis (PubMed:21266575, PubMed:22524624, PubMed:27815501, PubMed:28223313). Catalyzes a non-decarboxylative head-to-head Claisen condensation of two acyl-CoA molecules, generating an (R)-2-alkyl-3-oxoalkanoate (PubMed:21266575, PubMed:22524624, PubMed:27815501). Is active with fatty acyl-CoA substrates that ranged from C(8) to C(16) in length, and is the most active with palmitoyl-CoA and myristoyl-CoA (PubMed:21266575).[1] [2] [3] [4] Publication Abstract from PubMedRenewable production of hydrocarbons is being pursued as a petroleum-independent source of commodity chemicals and replacement for biofuels. The bacterial biosynthesis of long-chain olefins represents one such platform. The process is initiated by OleA catalyzing the condensation of two fatty acyl-coenzyme A substrates to form a beta-keto acid. Here, the mechanistic role of the conserved His285 is investigated through mutagenesis, activity assays, and X-ray crystallography. Our data demonstrate that His285 is required for product formation, influences the thiolase nucleophile Cys143 and the acyl-enzyme intermediate before and after transesterification, and orchestrates substrate coordination as a defining component of an oxyanion hole. As a consequence, His285 plays a key role in enabling a mechanistic strategy in OleA that is distinct from other thiolases. The role of OleA His285 in orchestration of long-chain acyl-coenzyme A substrates.,Jensen MR, Goblirsch BR, Esler MA, Christenson JK, Mohamed FA, Wackett LP, Wilmot CM FEBS Lett. 2018 Feb 11. doi: 10.1002/1873-3468.13004. PMID:29430657[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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