A Putative Precursor of Isomalabaricane Triterpenoids from Lanosterol Synthase Mutants
作者:Silvia Lodeiro、William K. Wilson、Hui Shan、Seiichi P. T. Matsuda
DOI:10.1021/ol052725j
日期:2006.2.1
[reaction: see text]. Known lanosterol synthase mutants produce monocyclic or tetracyclic byproducts from oxidosqualene. We describe Erg7 Tyr510 mutants that cause partial substrate misfolding and generate a tricyclic byproduct. This novel triterpene, (13alphaH)-isomalabarica-14(27),17E,21-trien-3beta-ol, is the likely biosynthetic precursor of isomalabaricane triterpenoids in sponges. The results
Steric Bulk at Cycloartenol Synthase Position 481 Influences Cyclization and Deprotonation
作者:Seiichi P. T. Matsuda、Lisa B. Darr、Elizabeth A. Hart、Jennifer B. R. Herrera、Kelly E. McCann、Michelle M. Meyer、Jihai Pang、Hala G. Schepmann
DOI:10.1021/ol006018w
日期:2000.7.1
Cycloartenolsynthaseconvertsoxidosqualene to the pentacyclic sterol precursor cycloartenol. An Arabidopsis thaliana cycloartenolsynthase Ile481Val mutant was previously shown to produce lanosterol and parkeol in addition to its native productcycloartenol. Experiments are described here to construct Phe, Leu, Ala, and Gly mutants at position 481 and to determine their cyclization product profiles
Enzyme Redesign: Two Mutations Cooperate to Convert Cycloartenol Synthase into an Accurate Lanosterol Synthase
作者:Silvia Lodeiro、Tanja Schulz-Gasch、Seiichi P. T. Matsuda
DOI:10.1021/ja053791j
日期:2005.10.1
broaden the substrate or product specificity of an accurate enzyme than to restrict the selectivity of one that is promiscuous. Described herein are experiments in which cycloartenolsynthase was redesigned to become a highly accurate lanosterolsynthase. Several single mutants have been described that modify the catalytic specificity of cycloartenol to form some lanosterol. Modeling studies were undertaken