Journal
MICROBES AND ENVIRONMENTS
Volume 32, Issue 4, Pages 324-329Publisher
JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE
DOI: 10.1264/jsme2.ME17015
Keywords
N-2 fixation; nif genes; genome analysis; Thermoleptolyngbya; non-heterocystous cyanobacteria
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Funding
- JSPS KAKENHI Grant [JP26000008, JP15K05566]
- World Premier International Research Center Initiative (WPI), Japan
- Grants-in-Aid for Scientific Research [26000008, 15K05566] Funding Source: KAKEN
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Cyanobacteria are widely distributed in marine, aquatic, and terrestrial ecosystems, and play an important role in the global nitrogen cycle. In the present study, we examined the genome sequence of the thermophilic non-heterocystous N-2-fixing cyanobacterium, Thermoleptolyngbya sp. O-77 (formerly known as Leptolyngbya sp. O-77) and characterized its nitrogenase activity. The genome of this cyanobacterial strain O-77 consists of a single chromosome containing a nitrogen fixation gene cluster. A phylogenetic analysis indicated that the NifH amino acid sequence from strain O-77 was clustered with those from a group of mesophilic species: the highest identity was found in Leptolyngbya sp. KIOST-1 (97.9% sequence identity). The nitrogenase activity of O-77 cells was dependent on illumination, whereas a high intensity of light of 40 mu mol m(-2) s(-1) suppressed the effects of illumination.
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