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Energy Starved Candidatus Pelagibacter Ubique Substitutes Light-Mediated ATP Production for Endogenous Carbon Respiration
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Journal Article
Energy Starved Candidatus Pelagibacter Ubique Substitutes Light-Mediated ATP Production for Endogenous Carbon Respiration
2011
Overview
Previous studies have demonstrated that Candidatus Pelagibacter ubique, a member of the SAR11 clade, constitutively expresses proteorhodopsin (PR) proteins that can function as light-dependent proton pumps. However, exposure to light did not significantly improve the growth rate or final cell densities of SAR11 isolates in a wide range of conditions. Thus, the ecophysiological role of PR in SAR11 remained unresolved. We investigated a range of cellular properties and here show that light causes dramatic changes in physiology and gene expression in Cand. P. ubique cells that are starved for carbon, but provides little or no advantage during active growth on organic carbon substrates. During logarithmic growth there was no difference in oxygen consumption by cells in light versus dark. Energy starved cells respired endogenous carbon in the dark, becoming spheres that approached the minimum predicted size for cells, and produced abundant pili. In the light, energy starved cells maintained size, ATP content, and higher substrate transport rates, and differentially expressed nearly 10% of their genome. These findings show that PR is a vital adaptation that supports Cand. P. ubique metabolism during carbon starvation, a condition that is likely to occur in the extreme conditions of ocean environments.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
Adenosine Triphosphate - biosynthesis
/ Aerobiosis - radiation effects
/ Alphaproteobacteria - cytology
/ Alphaproteobacteria - genetics
/ Alphaproteobacteria - metabolism
/ Alphaproteobacteria - ultrastructure
/ ATP
/ Bacteria
/ Biological Transport - drug effects
/ Biological Transport - radiation effects
/ Biology
/ Candidatus Pelagibacter ubique
/ Carbon
/ Darkness
/ E coli
/ Energy
/ Energy Metabolism - drug effects
/ Energy Metabolism - radiation effects
/ Gene Expression Regulation, Bacterial - drug effects
/ Gene Expression Regulation, Bacterial - radiation effects
/ Genes
/ Genomes
/ Genomics
/ Light
/ Oxygen
/ Pili
/ Proteins
/ Sulfur
