Cited by 132Algal biology and biofuel productionLipid metabolism and biosynthesisMicrobial Metabolic Engineering and Bioproduction

Physiological and molecular analysis of carbon source supplementation and pH stress-induced lipid accumulation in the marine diatom Phaeodactylum tricornutum

Mus, Florence, Toussaint, Jean-Paul, Cooksey, Keith E., Fields, Matthew W., Gerlach, Robin, Peyton, Brent M., Carlson, Ross P.·2013·Applied Microbiology and Biotechnology

Abstract

A detailed physiological and molecular analysis of lipid accumulation under a suite of conditions including nitrogen limitation, alkaline pH stress, bicarbonate supplementation, and organic acid supplementation was performed on the marine diatom Phaeodactylum tricornutum. For all tested conditions, nitrogen limitation was a prerequisite for lipid accumulation and the other culturing strategies only enhanced accumulation highlighting the importance of compounded stresses on lipid metabolism. Volumetric lipid levels varied depending on condition; the observed rankings from highest to lowest were for inorganic carbon addition (15 mM bicarbonate), organic acid addition (15 carbon mM acetate), and alkaline pH stress (pH 9.0). For all lipid-accumulating cultures except acetate supplementation, a common series of physiological steps were observed. Upon extracellular nitrogen exhaustion, culture growth continued for approximately 1.5 cell doublings with decreases in specific protein and photosynthetic pigment content. As nitrogen limitation arrested cell growth, carbohydrate content decreased with a corresponding increase in lipid content. Addition of the organic carbon source acetate appeared to activate alternative metabolic pathways for lipid accumulation. Molecular level data on more than 50 central metabolism transcripts were measured using real-time PCR. Analysis of transcripts suggested the central metabolism pathways associated with bicarbonate transport, carbonic anhydrases, and C4 carbon fixations were important for lipid accumulation. Transcriptomic data also suggested that repurposing of phospholipids may play a role in lipid accumulation. This study provides a detailed physiological and molecular-level foundation for improved understanding of diatom nutrient cycling and contributes to a metabolic blueprint for controlling lipid accumulation in diatoms.

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Crossref · 10.1007/s00253-013-4747-7

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Authors
Mus, F., Toussaint, J.-P., Cooksey, K. E., Fields, M. W., Gerlach, R., Peyton, B. M., & Carlson, R. P.
Affiliations
Montana State University (US)
Corresponding author
  • Mus, Florence
  • Carlson, Ross P.
Venue
Applied Microbiology and Biotechnology
Published
2013-03-06
Volume
97
Issue
8
Pages
3625-3642
ISSN
  • 0175-7598 (ISSN-L)
  • 1432-0614
OpenAlex
W2142110641
Cited by
132
References
87
Citations by year
2026: 1 · 2025: 6 · 2024: 6 · 2023: 12 · 2022: 13 · 2021: 7 · 2020: 15 · 2019: 14 · 2018: 13 · 2017: 7 · 2016: 10 · 2015: 11 · 2014: 11 · 2013: 5
FWCI
4.48
Type
journal article
Language
en
Open access
closed
Locations
  • Applied Microbiology and Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
  • Montana State University ScholarWorks (Montana State University) (submittedVersion)
Funders
Air Force Office of Scientific Research
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
Phaeodactylum tricornutum, lipid accumulation, nitrogen limitation, sodium bicarbonate supplementation, acetate supplementation, carbon source supplementation, central carbon metabolism, carbonic anhydrase, bicarbonate transport
MeSH terms
Alkalies, Carbon, Carboxylic Acids, Hydrogen-Ion Concentration, Nitrogen, Stress, Physiological, Diatoms, Gene Expression Profiling, Lipid Metabolism, Metabolic Networks and Pathways, Aquatic Organisms, Real-Time Polymerase Chain Reaction

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