| Assay of ATP in intact cells of the facultative phototroph Rhodobacter capsulatus expressing recombinant firefly luciferase. | |
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MedLine Citation:
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PMID: 11797039 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study reports on the construction, calibration and use of recombinant cells of Rhodobacter capsulatus expressing the luciferase gene of the North American firefly Photinus pyralis to detect, by bioluminescence, variations of endogenous ATP levels under various physiological conditions. We show that the antibiotic polymyxin B allows luciferin to rapidly move into cell cytosol, but does not make external ATP freely accessible to intracellular luciferase. Notably, in toluene:ethanol-permeabilized cells, the apparent K(mATP) for luciferase (50 microM) is similar to that measured in soluble cell fractions. This finding limits the applicability of the firefly luciferase for monitoring intracellular maximal ATP concentration because dark/aerobic-grown recombinant cells of Rba. capsulatus contain approximately 1.3-2.6+/-0.5 mM ATP. Therefore, the effects of chemical and physical factors such as oxygen, light, carbonyl cyanide m-chlorophenyl hydrazone and antimycin A on ATP synthesis were examined in cells subjected to different starvation periods to reduce the endogenous ATP pool below the luciferase ATP saturation level (< or =0.2 mM). We conclude that the amount of endogenous ATP generated by light is maximal in the presence of oxygen, which is required to optimize the membrane redox poise. |
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Authors:
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G Di Tomaso; R Borghese; D Zannoni |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2001-10-03 |
Journal Detail:
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Title: Archives of microbiology Volume: 177 ISSN: 0302-8933 ISO Abbreviation: Arch. Microbiol. Publication Date: 2001 Dec |
Date Detail:
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Created Date: 2002-01-17 Completed Date: 2002-04-22 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0410427 Medline TA: Arch Microbiol Country: Germany |
Other Details:
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Languages: eng Pagination: 11-9 Citation Subset: IM |
Affiliation:
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Department of Biology, University of Bologna, 42 Irnerio, 40126 Bologna, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adenosine Triphosphate
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metabolism* Animals Bacteria / cytology, genetics, growth & development, metabolism* Beetles / enzymology* Kinetics Luciferases / genetics, metabolism* Polymyxin B / pharmacology Recombinant Proteins / genetics, metabolism* Rhodobacter capsulatus / cytology, genetics, growth & development, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Recombinant Proteins; 1404-26-8/Polymyxin B; 56-65-5/Adenosine Triphosphate; EC 1.13.12.-/Luciferases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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