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OLIgo Mass Profiling (OLIMP) of Extracellular Polysaccharides
Published on: June 20, 2010
Plant cell wall degradation by saprophytic Bacillus subtilis strains: gene clusters responsible for
Akihito Ochiai1, Takafumi Itoh, Akiko Kawamata
1Laboratory of Basic and Applied Molecular Biotechnology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan.
Applied and Environmental Microbiology
|April 24, 2007
Summary
Bacillus subtilis degrades plant cell wall rhamnogalacturonan type I (RG-I) using a novel enzymatic system. This bacterial pathway, involving specific lyases and hydrolases, differs from fungal degradation methods.
Area of Science:
- Microbiology
- Biochemistry
- Plant Science
Background:
- Plant cell wall degradation is crucial for Bacillus subtilis saprophytic interactions.
- Rhamnogalacturonan type I (RG-I) is a key pectin component in plant cell walls.
Purpose of the Study:
- To elucidate the RG-I degradation system in Bacillus subtilis strain 168.
- To identify the genes and enzymes involved in breaking down RG-I.
Main Methods:
- Growth experiments using plant cell wall polysaccharides as carbon sources.
- DNA microarray analysis to identify induced gene clusters.
- Enzymatic characterization of RG lyases (YesW, YesX) and hydrolases (YesR, YteR).
Main Results:
- Bacillus subtilis strain 168 efficiently grows on RG-I and related polysaccharides.
- Three gene clusters (yes, yte, ybc-ybd) are significantly upregulated during RG-I assimilation.
- Novel RG lyases YesW and YesX were identified, responsible for extracellular disaccharide release from RG-I.
- Intracellular hydrolases YesR and YteR complete the degradation to monosaccharides.
Conclusions:
- Bacillus subtilis possesses a unique bacterial enzymatic pathway for complete RG-I degradation.
- This system differs from known fungal degradation mechanisms.
- This study presents the first report of a bacterial system for RG-I main chain degradation.
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