Paenibacillus Sp. Strain JDR-2 and XynA1: a Novel System for Methylglucuronoxylan Utilization

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 2006 Feb 8

PMID 16461704

Citations 36

Authors

Franz J Stjohn

John D Rice

James F Preston

Affiliations

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Abstract

Environmental and economic factors predicate the need for efficient processing of renewable sources of fuels and chemicals. To fulfill this need, microbial biocatalysts must be developed to efficiently process the hemicellulose fraction of lignocellulosic biomass for fermentation of pentoses. The predominance of methylglucuronoxylan (MeGAXn), a beta-1,4 xylan in which 10% to 20% of the xylose residues are substituted with alpha-1,2-4-O-methylglucuronate residues, in hemicellulose fractions of hardwood and crop residues has made this a target for processing and fermentation. A Paenibacillus sp. (strain JDR-2) has been isolated and characterized for its ability to efficiently utilize MeGAXn. A modular xylanase (XynA1) of glycosyl hydrolase family 10 (GH 10) was identified through DNA sequence analysis that consists of a triplicate family 22 carbohydrate binding module followed by a GH 10 catalytic domain followed by a single family 9 carbohydrate binding module and concluding with C-terminal triplicate surface layer homology (SLH) domains. Immunodetection of the catalytic domain of XynA1 (XynA1 CD) indicates that the enzyme is associated with the cell wall fraction, supporting an anchoring role for the SLH modules. With MeGAXn as substrate, XynA1 CD generated xylobiose and aldotetrauronate (MeGAX3) as predominant products. The inability to detect depolymerization products in medium during exponential growth of Paenibacillus sp. strain JDR-2 on MeGAXn, as well as decreased growth rate and yield with XynA1 CD-generated xylooligosaccharides and aldouronates as substrates, indicates that XynA1 catalyzes a depolymerization process coupled to product assimilation. This depolymerization/assimilation system may be utilized for development of biocatalysts to efficiently convert MeGAXn to alternative fuels and biobased products.

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