Characterization and high-quality draft genome sequence of Herbivorax saccincola A7, an anaerobic, alkaliphilic, thermophilic, cellulolytic, and xylanolytic bacterium

Systematic and Applied Microbiology
Shimpei AikawaAkihiko Kosugi

Abstract

An anaerobic, cellulolytic-xylanolytic bacterium, designated strain A7, was isolated from a cellulose-degrading bacterial community inhabiting bovine manure compost on Ishigaki Island, Japan, by enrichment culture using unpretreated corn stover as the sole carbon source. The strain was Gram-positive, non-endospore forming, non-motile, and formed orange colonies on solid medium. Strain A7 was identified as Herbivorax saccincola by DNA-DNA hybridization, and phylogenetic analysis based on 16S rRNA gene sequences showed that it was closely related to H. saccincola GGR1 (= DSM 101079T). H. saccincola A7 (= JCM 31827=DSM 104321) had quite similar phenotypic characteristics to those of strain GGR1. However, the optimum growth of A7 was at alkaline pH (9.0) and 55°C, compared to pH 7.0 at 60°C for GGR1, and the fatty acid profile of A7 contained 1.7-times more C17:0iso than GGR1. The draft genome sequence revealed that H. saccincola A7 possessed a cellulosome-like extracellular macromolecular complex, which has also been found for Clostridium thermocellum and C. clariflavum. H. saccincola A7 contained more glycoside hydrolases (GHs) belonging to GH families-11 and -2, and more diversity of xylanolytic enzymes, than C. thermocellum and...Continue Reading

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