9lpb

Terpene cyclase AriE mutant-D128A

spinqualitylabelsall models 9lpb, resolution 1.87Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9lpb is a 1 chain structure with sequence from Amycolatopsis arida. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.87Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A1I5P1T3_9PSEU Publication Abstract from PubMed Eunicellane diterpenoids, with over 360 known examples characterized by a cis- or trans-6/10-bicyclic carbon skeleton, exhibit diverse biological activities. To date, five eunicellane cyclases (ECs) have been reported: cis-ECs (Bnd4, CpDTS2 and EcTPS1) and trans-ECs (AlbS and MicA), yet the structural basis and molecular mechanisms governing their distinct cis- or trans-cyclization modes remain unsolved. Here, we present the crystal structure of a cis-EC AriE from Amycolatopsis arida, which catalyzes geranylgeranyl diphosphate to form cis-6/10-fused bicyclic benditerpe-2,6,15-triene (1) in aridacin biosynthesis. Through surface entropy reduction, we obtained the 1.87 A resolution structure of AriED128A. Structure-guided mutagenesis identified W73 as a key regulatory hotspot controlling product diversity, with its variants generating diverse diterpene products. Y203A converted AriE into a highly specific (-)-(R)-cembrene A synthase. Our findings provide the first structural insights into this type of terpene synthase and demonstrate the feasibility of engineering EC variants for selective product formation. Crystal Structure and Catalytic Mechanism of the cis-Eunicellane Cyclase AriE.,Li FR, Yang Q, He J, Sun X, Pan X, Xu HM, Rudolf JD, Dong LB Chemistry. 2025 Apr 23:e202500012. doi: 10.1002/chem.202500012. PMID:40265331 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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