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Characterization of ten H-2 producing cyanobacteria isolated from the Baltic Sea and Finnish lakes
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström.
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2014 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 39, no 17, p. 8983-8991Article in journal (Refereed) Published
Abstract [en]

The genetic background and activities of the enzymes involved in H-2 production were investigated from ten distinct H-2 producing cyanobacteria, revealed by a recent screening. All strains are N-2-fixing, filamentous and heterocystous. Southern hybridization revealed that the tested strains possess the genes encoding the conventional nitrogenase (nifHDK1), and lack the alternative nitrogenases. The high H-2 production rate of these strains was shown not to be dependent on the presence of highly active nitrogenase or bidirectional hydrogenase enzymes. Moreover, most of the strains possessed a highly active uptake hydrogenase enzyme. We also examined the structure of the nif and hup operons encoding nitrogenase and uptake hydrogenase enzymes in the Calothrix 336/3 strain, the best H-2 producer in the screening. We concluded that the ability of the cyanobacteria to produce high levels of H-2 is not directly linked to the maximum capacities of the enzymes involved in H-2 production.

Place, publisher, year, edition, pages
2014. Vol. 39, no 17, p. 8983-8991
Keywords [en]
Cyanobacteria, Hydrogenase, Nitrogenase, Southern hybridization
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URN: urn:nbn:se:uu:diva-228456DOI: 10.1016/j.ijhydene.2014.03.171ISI: 000336880500009OAI: oai:DiVA.org:uu-228456DiVA, id: diva2:734294
Available from: 2014-07-16 Created: 2014-07-15 Last updated: 2017-12-05Bibliographically approved

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Lindblad, Peter

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