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Screening and Phy.ogenetic Analy.is of Deep-Sea Bacteria Capable of Metabolizing Lignin-Derived Aromatic Compounds

Open Journal of Marine Science 2012年第4期2卷 177-187页

作者： y. Ohta S. Nishi T. Haga T. Tsubouchi R. Hasegawa M. Konishi y. Nagano y. tsuruwaka y. Shimane K. Mori K. Usui E. Suda K. Tsutsui A. Nishimoto y. Fujiwara T. Maruy.ma y. Hatada Institute of Biogeosciences Japan Agency of Marine-Earth Science and Technology (JAMSTEC) Yokosuka Japan

Lignin is one of the most abundant biomasses in nature. It is composed of aromatic moieties and has great potential for use in the production of chemical alternatives to petroleum products. Because of increasing interest in biocataly.is, the potential for industrial application of microbial metabolism of lignin-derived compounds has gained considerable recent attention. Functional screenings of culturable bacteria isolated from sediments and sunken wood collected from the deep sea revealed the existence of a number of previously.unidentified bacteria capable of metabolizing lignin-related aromatic compounds. Of the 510 isolates obtained in the present study. 208 completely.or partially.metabolized these compounds. The 208 isolates were classified into diverse phy.a, including Firmicutes, Actinobacteria, Bacteroidetes, and Proteobacteria. Among the 208 isolates, 61 unique 16S rRNA gene sequences were detected including previously.unidentified marine lineage isolates. The metabolites of the isolates were analy.ed using liquid chromatography.mass spectrometry.(LC/MS) or gas chromatography.mass spectrometry.(GC/MS). Most of the representative 61 isolates non-oxidatively.decarboxy.ated the substrates to produce the corresponding aromatic viny. monomers, which are used as feed stocks for bio-based plastics production. Oxidative metabolism of the lignin-related compounds for assimilation was frequently.observed. Our study.showed that the deep-sea environment contains an abundance of microorganisms capable of both non-oxidative and oxidative bioconversion of lignin-derived aromatic compounds. The ability.for bio-conversion of aromatic compounds found in this study.will facilitate the development of future biotechnological applications.

关键词： Aromatic Compound Bacteria Deep Sea Lignin

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