Insight into the Molecular Basis of Aromatic Polyketide Cyclization: Crystal Structure and in Vitro Characterization of WhiE-ORFVI
作者:Ming-Yue Lee、Brian D. Ames、Shiou-Chuan Tsai
DOI:10.1021/bi201705q
日期:2012.4.10
Aromatic polyketides are biologically active natural products. Many important pharmaceuticals are derived from aromatic polyketides. Especially important in aromatic polyketide biosynthesis is the regiospecific cyclization of a linear, preassembled polyketide chain catalyzed by aromatase/cyclase (ARO/CYC), which serves as a key control point in aromatic ring formation. How different ARO/CYCs promote different cyclization patterns is not well understood. The whiE locus of Streptomyces coelicolor A3(2) is responsible for the biosynthesis of an aromatic polyketide precursor to the gray spore pigment. The WhiE ARO/CYC catalyzes the regiospecific C9-C14 and C7-C16 cyclization and aromatization of a 24-carbon polyketide chain. WhiE ARO/CYC shares a high degree of similarity to another nonreducing PKS ARO/CYC, TcmN ARO/CYC. This paper presents the apo crystal structure of WhiE ARO/CYC, and cocrystal structures of WhiE and TcmN ARO/CYCs bound with polycyclic aromatic compounds that mimic the respective ARO/CYC products. Site-directed mutagenesis coupled with in vitro PKS reconstitution assays was used to characterize the interior pocket residues of WhiE ARO/CYC. The results confirmed that the Interior pocket of ARO/CYCs is a critical determinant of polyketide cyclization specificity. A unified ARO/CYC-mediated cyclization mechanism is proposed on the basis of these structural and functional results.
PROCESSES AND HOST CELLS FOR GENOME, PATHWAY, AND BIOMOLECULAR ENGINEERING
申请人:enEvolv, Inc.
公开号:EP3027754A1
公开(公告)日:2016-06-08
US9944925B2
申请人:——
公开号:US9944925B2
公开(公告)日:2018-04-17
[EN] PROCESSES AND HOST CELLS FOR GENOME, PATHWAY, AND BIOMOLECULAR ENGINEERING<br/>[FR] PROCÉDÉS ET CELLULES HÔTES POUR INGÉNIERIE BIOMOLÉCULAIRE, GÉNOMIQUE ET DE LA VOIE
申请人:ENEVOLV INC
公开号:WO2015017866A1
公开(公告)日:2015-02-05
The present disclosure provides compositions and methods for genomic engineering.