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Lookup NU author(s): Dr Rafael Pernil-Garcia
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In the diazotrophic filaments of heterocyst-forming cyanobacteria, an exchange of metabolites takes place between vegetative cells and heterocysts that results in a net transfer of reduced carbon to the heterocysts and of fixed nitrogen to the vegetative cells. Open reading frame alr2355 of the genome of Anabaena sp. strain PCC 7120 is the ald gene encoding alanine dehydrogenase. A strain carrying a green fluorescent protein (GFP) fusion to the N terminus of Ald (Ald-N-GFP) showed that the ald gene is expressed in differentiating and mature heterocysts. Inactivation of ald resulted in a lack of alanine dehydrogenase activity, a substantially decreased nitrogenase activity, and a 50% reduction in the rate of diazotrophic growth. Whereas production of alanine was not affected in the ald mutant, in vivo labeling with [14C]alanine (in whole filaments and isolated heterocysts) or [14C]pyruvate (in whole filaments) showed that alanine catabolism was hampered. Thus, alanine catabolism in the heterocysts is needed for normal diazotrophic growth. Our results extend the significance of a previous work that suggested that alanine is transported from vegetative cells into heterocysts in the diazotrophic Anabaena filament. Copyright © 2010, American Society for Microbiology. All Rights Reserved.
Author(s): Pernil R, Herrero A, Flores E
Publication type: Article
Publication status: Published
Journal: Journal of Bacteriology
Year: 2010
Volume: 192
Issue: 19
Pages: 5165-5172
Print publication date: 01/10/2010
ISSN (print): 0021-9193
ISSN (electronic): 1067-8832
Publisher: American Society for Microbiology
URL: http://dx.doi.org/10.1128/JB.00603-10
DOI: 10.1128/JB.00603-10
PubMed id: 20675483
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