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Assaying for Inorganic Polyphosphate in Bacteria

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Published on: January 21, 2019

Comparative quantitative proteomics of prochlorococcus ecotypes to a decrease in environmental phosphate

Matthew A Fuszard¹, Phillip C Wright, Catherine A Biggs

¹ChELSI Institute, Department of Chemical and Biological Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK. c.biggs@sheffield.ac.uk.

Aquatic Biosystems

|April 7, 2012

Summary

This summary is machine-generated.

Marine cyanobacteria Prochlorococcus show varied responses to low phosphate conditions. High light strains exhibit altered protein expression and growth, unlike low light strains, indicating strain-specific nutrient regulation.

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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

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Area of Science:

Marine microbiology
Oceanography
Biogeochemistry

Background:

Oligotrophic gyres are crucial for global primary production.
Prochlorococcus cyanobacteria are key primary producers in these environments.
Phosphate availability is a critical limiting nutrient in many oligotrophic regions.

Purpose of the Study:

To investigate the physiological and proteomic responses of Prochlorococcus to phosphate limitation.
To compare the responses of high light (HL) and low light (LL) ecotypes to nutrient stress.

Main Methods:

Culturing of Prochlorococcus strains (MIT9312, NATL2A, SS120) in phosphate-depleted media.
Quantitative proteomic analysis to assess cellular protein expression.
Monitoring of growth rates under experimental conditions.

Main Results:

Significant differences in protein expression were observed across Prochlorococcus strains.
High light strain MIT9312 showed altered growth rate and significant upregulation of phosphate-related proteins (e.g., PhoE).
Rubisco protein (RbcL) abundance decreased in MIT9312, with minimal changes observed in LL strain SS120.

Conclusions:

Phosphate availability impacts Prochlorococcus ecotypes differently.
Phosphate acquisition mechanisms are activated at strain-specific phosphate concentrations.
Differential responses highlight the ecological significance of nutrient availability for marine cyanobacteria.