Mar. Drugs 2013, 11(8), 3091-3108; doi:10.3390/md11083091
Article

BMAA Inhibits Nitrogen Fixation in the Cyanobacterium Nostoc sp. PCC 7120

Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm S-10691, Sweden
* Author to whom correspondence should be addressed.
Received: 1 May 2013; in revised form: 21 June 2013 / Accepted: 31 July 2013 / Published: 21 August 2013
(This article belongs to the Special Issue Compounds from Cyanobacteria)
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Abstract: Cyanobacteria produce a range of secondary metabolites, one being the neurotoxic non-protein amino acid β-N-methylamino-L-alanine (BMAA), proposed to be a causative agent of human neurodegeneration. As for most cyanotoxins, the function of BMAA in cyanobacteria is unknown. Here, we examined the effects of BMAA on the physiology of the filamentous nitrogen-fixing cyanobacterium Nostoc sp. PCC 7120. Our data show that exogenously applied BMAA rapidly inhibits nitrogenase activity (acetylene reduction assay), even at micromolar concentrations, and that the inhibition was considerably more severe than that induced by combined nitrogen sources and most other amino acids. BMAA also caused growth arrest and massive cellular glycogen accumulation, as observed by electron microscopy. With nitrogen fixation being a process highly sensitive to oxygen species we propose that the BMAA effects found here may be related to the production of reactive oxygen species, as reported for other organisms.
Keywords: cyanobacteria; toxin; BMAA; Nostoc sp. PCC 7120; nitrogen fixation; nitrogenase activity

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MDPI and ACS Style

Berntzon, L.; Erasmie, S.; Celepli, N.; Eriksson, J.; Rasmussen, U.; Bergman, B. BMAA Inhibits Nitrogen Fixation in the Cyanobacterium Nostoc sp. PCC 7120. Mar. Drugs 2013, 11, 3091-3108.

AMA Style

Berntzon L, Erasmie S, Celepli N, Eriksson J, Rasmussen U, Bergman B. BMAA Inhibits Nitrogen Fixation in the Cyanobacterium Nostoc sp. PCC 7120. Marine Drugs. 2013; 11(8):3091-3108.

Chicago/Turabian Style

Berntzon, Lotta; Erasmie, Sven; Celepli, Narin; Eriksson, Johan; Rasmussen, Ulla; Bergman, Birgitta. 2013. "BMAA Inhibits Nitrogen Fixation in the Cyanobacterium Nostoc sp. PCC 7120." Mar. Drugs 11, no. 8: 3091-3108.

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