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利用Tn5tac1从菊花欧文氏菌EC16突变体中克隆一个编码高碱性、富含天冬酰胺的果胶酸裂解酶同工酶的pel基因,该突变体存在影响主要果胶酸裂解酶同工酶的缺失。

Use of Tn5tac1 to clone a pel gene encoding a highly alkaline, asparagine-rich pectate lyase isozyme from an Erwinia chrysanthemi EC16 mutant with deletions affecting the major pectate lyase isozymes.

作者信息

Alfano J R, Ham J H, Collmer A

机构信息

Department of Plant Pathology, Cornell University, Ithaca, New York 14853-4203, USA.

出版信息

J Bacteriol. 1995 Aug;177(15):4553-6. doi: 10.1128/jb.177.15.4553-4556.1995.

Abstract

Erwinia chrysanthemi mutant CUCPB5047, delta(pelA pelE) delta(pelB pelC)::28bp delta(pelX) delta 4bp pehX::omega Cmr, was constructed, mutated with Tn5tac1, and screened for isopropyl-beta-D-thiogalactopyranoside-dependent pectate lyase (Pel) production. A Kmr SacI fragment from the hyperexpressing Pel+ mutant CUCPB5066 was cloned into Escherichia coli and sequenced. The gene identified, pelL, encodes a novel, asparagine-rich, highly alkaline enzyme that is similar in primary structure to PelX and in enzymological properties to PelE.

摘要

构建了菊欧文氏菌突变体CUCPB5047,即Δ(pelA pelE) Δ(pelB pelC)::28bp Δ(pelX) Δ4bp pehX::ωCmr,用Tn5tac1进行诱变,并筛选对异丙基-β-D-硫代半乳糖苷依赖的果胶酸裂解酶(Pel)的产生情况。从超表达Pel+突变体CUCPB5066中克隆出一个Kmr SacI片段并导入大肠杆菌中进行测序。鉴定出的基因pelL编码一种新型的、富含天冬酰胺的高碱性酶,其一级结构与PelX相似,酶学性质与PelE相似。

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