Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis.

Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Research Abstract Details 

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Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Abstract Text:

S Berry,J H Fischer,J Kruip,M Hauser,G F Wildner,

Disruption of the ccmM gene in the cyanobacterium Synechocystis sp. PCC 6803 causes a deficiency of carboxysomes and impairs growth in ambient CO2. The effect of this gene defect on cellular metabolism was investigated using electron microscopy, biochemical and fluorescence analysis. Mutant cells were devoid of the characteristic dense polyhedral bodies called carboxysomes. The photosynthetic oxygen evolution was considerably lower in mutant cells compared to wild type, while Rubisco activity in cell extracts was similar. During photosynthetic CO2-dependent oxygen evolution, Rubisco Vmax dropped from 142 micromol mg-1 chlorophyll h-1 (WT) to 77 micromol mg-1 chlorophyll h-1 in the mutant cells, and the Km for Ci (inorganic carbon) increased from 0.5 mM (WT) to 40 mM. The fluorescent indicator, acridine yellow, was used for non-invasive measurements of cytoplasmic pH changes in whole cells induced by addition of Ci, making use of the decrease in fluorescence yield that accompanies cytoplasmic acidification. The experimental results indicate that control of the cytoplasmic pH is linked to the internal carbon pool (Ci). Both wild-type and ccmM-deficient cells showed a linear response of acridine yellow fluorescence quenching and, thus, of internal acidification, with respect to externally added inorganic carbon. However, the fluorescence analysis of mutant (carboxysome-free) cells indicated slower kinetics of Ci accumulation.

Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Publishing Authors By Initials

S Berry,JH Fischer,J Kruip,M Hauser,GF Wildner,

For similar bacteria: cyanobacteria: synechocystis research abstracts see: bacteria: cyanobacteria: synechocystis research

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Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Plant biology (Stuttgart, Germany)

VOLUME: 7

Page Numbers: 342-7

Journal Abbreviation: Plant Biol (Stuttg)

ISSN: 1435-8603

DAY: 7

MONTH: Jul

YEAR: 2005

Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Information

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LANGUAGE: eng

NlmUniqueID: 101148926

Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Keywords Mesh Terms:

KEYWORDS: Synechocystis

MESH TERMS: ultrastructure

Chemical & Substance for Abstract: Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis. Information

Substance Name: Oxygen

Registry Number: 7782-44-7

Grant and Affiliation Information for Monitoring cytosolic pH of carboxysome-deficient cells of Synechocystis sp. PCC 6803 using fluorescence analysis.

AFFILIATION: Lehrstuhl für Biochemie der Pflanzen, Ruhr-Universität Bochum, 44780 Bochum, Germany.

Country: Germany

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MEDLINETA: Plant Biol (Stuttg)

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