Complete genome sequence and analysis of Lactobacillus hokkaidonensis LOOC260T, a psychrotrophic lactic acid bacterium isolated from silage

BMC Genomics

Masanori Arita²  Yasukazu Nakamura³  Eli Kaminuma³  Masanori Tohno¹  Yasuhiro Tanizawa³ 

[1]National Agriculture and Food Research Organization, National Institute of Livestock and Grassland Science, Tochigi 329-2793, Japan

[2]RIKEN Center for Sustainable Resource Science, Kanagawa 230-0045, Japan

[3]Center for Information Biology, National Institute of Genetics, Shizuoka 411-8540, Japan

关键词: Integrative and conjugative element;    Mobile genetic element;    Pentose metabolism;    Cold adaptation;    Silage fermentation;    Lactic acid bacteria;   

Others  :  1149197
DOI  :  10.1186/s12864-015-1435-2

 received in 2014-12-01, accepted in 2015-03-06,  发布年份 2015

【 摘 要 】

Background

Lactobacillus hokkaidonensis is an obligate heterofermentative lactic acid bacterium, which is isolated from Timothy grass silage in Hokkaido, a subarctic region of Japan. This bacterium is expected to be useful as a silage starter culture in cold regions because of its remarkable psychrotolerance; it can grow at temperatures as low as 4°C. To elucidate its genetic background, particularly in relation to the source of psychrotolerance, we constructed the complete genome sequence of L. hokkaidonensis LOOC260^T using PacBio single-molecule real-time sequencing technology.

Results

The genome of LOOC260^T comprises one circular chromosome (2.28 Mbp) and two circular plasmids: pLOOC260-1 (81.6 kbp) and pLOOC260-2 (41.0 kbp). We identified diverse mobile genetic elements, such as prophages, integrated and conjugative elements, and conjugative plasmids, which may reflect adaptation to plant-associated niches. Comparative genome analysis also detected unique genomic features, such as genes involved in pentose assimilation and NADPH generation.

Conclusions

This is the first complete genome in the L. vaccinostercus group, which is poorly characterized, so the genomic information obtained in this study provides insight into the genetics and evolution of this group. We also found several factors that may contribute to the ability of L. hokkaidonensis to grow at cold temperatures. The results of this study will facilitate further investigation for the cold-tolerance mechanism of L. hokkaidonensis.

【 授权许可】

   
2015 Tanizawa et al.; licensee BioMed Central.

【 图 表 】

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