Oxygen-dependent regulation of bacterial lipid production
Abstract
Understanding the mechanisms of lipid accumulation in microorganisms is important for several reasons. In addition to providing insight into assembly of biological membranes, lipid accumulation has important applications in the production of renewable fuels and chemicals. The photosynthetic bacterium Rhodobacter sphaeroides is an attractive organism to study lipid accumulation, as it has the somewhat unique ability to increase membrane production at low O₂ tensions. Under these conditions, R. sphaeroides develops invaginations of the cytoplasmic membrane to increase its membrane surface area for housing of the membrane-bound components of its photosynthetic apparatus. Here we use fatty acid levels as a reporter of membrane lipid content. We show that, under low-O₂ and anaerobic conditions, the total fatty acid content per cell increases 3-fold. We also find that the increases in the amount of fatty acid and photosynthetic pigment per cell are correlated as O₂ tensions or light intensity are changed. To ask if lipid and pigment accumulation were genetically separable, we analyzed strains with mutations in known photosynthetic regulatory pathways. While a strain lacking AppA failed to induce photosynthetic pigment-protein complex accumulation, it increased fatty acid content under low O2 conditions. We also found that an intact PrrBA pathway is required formore »
- Authors:
-
- Univ. of Wisconsin, Madison, WI (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1208744
- Report Number(s):
- PNNL-SA-106866
Journal ID: ISSN 0021-9193; 48544; 48815; KP1704020
- Grant/Contract Number:
- AC05-76RL01830; FC02-07ER64494
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Bacteriology
- Additional Journal Information:
- Journal Volume: 197; Journal Issue: 9; Journal ID: ISSN 0021-9193
- Publisher:
- American Society for Microbiology
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Environmental Molecular Sciences Laboratory
Citation Formats
Lemmer, Kimberly C., Dohnalkova, Alice C., Noguera, Daniel R., and Donohue, Timothy J. Oxygen-dependent regulation of bacterial lipid production. United States: N. p., 2015.
Web. doi:10.1128/JB.02510-14.
Lemmer, Kimberly C., Dohnalkova, Alice C., Noguera, Daniel R., & Donohue, Timothy J. Oxygen-dependent regulation of bacterial lipid production. United States. https://doi.org/10.1128/JB.02510-14
Lemmer, Kimberly C., Dohnalkova, Alice C., Noguera, Daniel R., and Donohue, Timothy J. 2015.
"Oxygen-dependent regulation of bacterial lipid production". United States. https://doi.org/10.1128/JB.02510-14. https://www.osti.gov/servlets/purl/1208744.
@article{osti_1208744,
title = {Oxygen-dependent regulation of bacterial lipid production},
author = {Lemmer, Kimberly C. and Dohnalkova, Alice C. and Noguera, Daniel R. and Donohue, Timothy J.},
abstractNote = {Understanding the mechanisms of lipid accumulation in microorganisms is important for several reasons. In addition to providing insight into assembly of biological membranes, lipid accumulation has important applications in the production of renewable fuels and chemicals. The photosynthetic bacterium Rhodobacter sphaeroides is an attractive organism to study lipid accumulation, as it has the somewhat unique ability to increase membrane production at low O₂ tensions. Under these conditions, R. sphaeroides develops invaginations of the cytoplasmic membrane to increase its membrane surface area for housing of the membrane-bound components of its photosynthetic apparatus. Here we use fatty acid levels as a reporter of membrane lipid content. We show that, under low-O₂ and anaerobic conditions, the total fatty acid content per cell increases 3-fold. We also find that the increases in the amount of fatty acid and photosynthetic pigment per cell are correlated as O₂ tensions or light intensity are changed. To ask if lipid and pigment accumulation were genetically separable, we analyzed strains with mutations in known photosynthetic regulatory pathways. While a strain lacking AppA failed to induce photosynthetic pigment-protein complex accumulation, it increased fatty acid content under low O2 conditions. We also found that an intact PrrBA pathway is required for low O2-induced fatty acid accumulation. In conclusion, our findings suggest a previously unknown role of R. sphaeroides transcriptional regulators in increasing fatty acid and phospholipid accumulation in response to decreased O₂ tension.},
doi = {10.1128/JB.02510-14},
url = {https://www.osti.gov/biblio/1208744},
journal = {Journal of Bacteriology},
issn = {0021-9193},
number = 9,
volume = 197,
place = {United States},
year = {Sat May 02 00:00:00 EDT 2015},
month = {Sat May 02 00:00:00 EDT 2015}
}
Web of Science
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