Comparative NMR analysis of cellooligosaccharide hydrolysis by GH9 bacterial and plant endo-1,4-ß-glucanases

被引：8

作者：

Rudsander, Ulla J. ^{[1
]}

Sandstrom, Corine ^{[2
]}

Piens, Kathleen ^{[1
]}

Master, Emma R. ^{[1
]}

Wilson, David B. ^{[3
]}

Brumer, Harry, III ^{[1
]}

Kenne, Lennart ^{[2
]}

Teeri, Tuula T. ^{[1
]}

机构：

[1] Swedish Ctr Biomimet Fiber Engn, KTH Biotechnol, SE-10691 Stockholm, Sweden

[2] Swedish Univ Agr Sci, Dept Chem, S-75007 Uppsala, Sweden

[3] Cornell Univ, Dept Mol Biol & Genet, Ithaca, NY 14853 USA

来源：

BIOCHEMISTRY | 2008年 / 47卷 / 18期

关键词：

D O I：

10.1021/bi702193e

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

H-1 NMR spectroscopy has been used to analyze the product profiles arising from the hydrolysis of cellooligosaccharides by family GH9 cellulases. The product profiles obtained with the wild type and several active site mutants of a bacterial processive endoglucanase, Tf Cel9A, were compared with those obtained by a randomly acting plant endoglucanase, PttCe19A. PttCe19A is an orthologue of the Arabidopsis endocellulase, Korrigan, which is required for efficient cellulose biosynthesis. As expected, poplar PttCe19A was shown to catalyze the degradation of cellooligosaccharides by inversion of the configuration of the anomeric carbon. The product analyses showed that the number of interactions between the glucose units of the substrate and the aromatic residues in the enzyme active sites determines the point of cleavage in both enzymes.

引用

页码：5235 / 5241

页数：7

共 13 条

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