Change search
ReferencesLink to record
Permanent link

Direct link
Regulation of proteorhodopsin gene expression by nutrient limitation in the marine bacterium Vibrio sp AND4
Show others and affiliations
2013 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 15, no 5, 1400-1415 p.Article in journal (Refereed) Published
Abstract [en]

Proteorhodopsin (PR), a ubiquitous membrane photoprotein in marine environments, acts as a light-driven proton pump and can provide energy for bacterial cellular metabolism. However, knowledge of factors that regulate PR gene expression in different bacteria remains strongly limited. Here, experiments with Vibrio sp. AND4 showed that PR phototrophy promoted survival only in cells from stationary phase and not in actively growing cells. PR gene expression was tightly regulated, with very low values in exponential phase, a pronounced peak at the exponential/stationary phase intersection, and a marked decline in stationary phase. Thus, PR gene expression at the entry into stationary phase preceded, and could therefore largely explain, the stationary phase light-induced survival response in AND4. Further experiments revealed nutrient limitation, not light exposure, regulated this differential PR expression. Screening of available marine vibrios showed that the PR gene, and thus the potential for PR phototrophy, is found in at least three different clusters in the genus Vibrio. In an ecological context, our findings suggest that some PR-containing bacteria adapted to the exploitation of nutrient-rich micro-environments rely on a phase of relatively slowly declining resources to mount a cellular response preparing them for adverse conditions dispersed in the water column.

Place, publisher, year, edition, pages
2013. Vol. 15, no 5, 1400-1415 p.
National Category
Cell and Molecular Biology
URN: urn:nbn:se:umu:diva-71305DOI: 10.1111/1462-2920.12085ISI: 000318041800012OAI: diva2:625762
Available from: 2013-06-05 Created: 2013-05-26 Last updated: 2013-06-05Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Milton, Debra L.
By organisation
Department of Molecular Biology (Faculty of Medicine)
In the same journal
Environmental Microbiology
Cell and Molecular Biology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 285 hits
ReferencesLink to record
Permanent link

Direct link