| Accumulation and storage of Zn2+ by Candida utilis. | |
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MedLine Citation:
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PMID: 6625 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Starved cells of Candida utilis accumulated Zn2+ by two different processes. The first was a rapid, energy- and temperature-independent system that probably represented binding to the cell surface. The cells also possessed an energy-, pH-, and temperature-dependent system that was capable of accumulating much greater quantities of the cation than the binding process. The energy-dependent system was inhibited by KCN, Na2HAsO4, m-chlorophenyl carbonylcyanide hydrazone, N-ethylmaleimide, EDTA and diethylenetriaminepenta-acetic acid. The system was specific inasmuch as Ca2+, Cr3+, Mn2+, Co2+ or Cu2+ did not compete with, inhibit, or enhance the process, Zn2+ uptake was inhibited by Cd2+. The system exhibited saturation kinetics with a half-saturation value of 1.3 muM and a maximum rate of 0.21 (nmol Zn2+) min(-1) (mg dry wt(-1)) at 30 degrees C. Zn2+ uptake required intact membranes since only the binding process was observed in the presence of nystatin, toluene, or sodium dodecyl sulphate. Cells did not exchange recently accumulated toluene, or sodium dodecyl sulphate. Cells did not exchange recently accumulated 65Zn following the addition of a large excess of non-radioactive Zn2+. Similarly, cells pre-loaded with 65Zn did not lose the cation during starvation, and efflux did not occur when glucose and exogenous Zn2+ were supplied after the starvation period. Efflux was only observed after the addition of toluene or nystatin, or when cells were heated to 100 degrees C. Cells fed a large quantity of Zn2+ contained a protein fraction resembling animal cell metallothionein. In batch culture, cells of C. utilis accumulated Zn2+ only during the lag phase and the latter half of the exponential-growth phase. |
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Authors:
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M L Failla; C D Benedict; E D Weinberg |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of general microbiology Volume: 94 ISSN: 0022-1287 ISO Abbreviation: J. Gen. Microbiol. Publication Date: 1976 May |
Date Detail:
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Created Date: 1976-08-23 Completed Date: 1976-08-23 Revised Date: 2009-10-27 |
Medline Journal Info:
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Nlm Unique ID: 0375371 Medline TA: J Gen Microbiol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 23-36 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Arsenates
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pharmacology Candida / metabolism* Cell Membrane / metabolism Cyanides / pharmacology Edetic Acid / pharmacology Electron Transport Ethylmaleimide / pharmacology Formaldehyde / pharmacology Fungal Proteins / biosynthesis Glucose / metabolism Hydrazones Hydrogen-Ion Concentration Kinetics Nystatin / pharmacology Pentetic Acid / pharmacology Temperature Toluene / pharmacology Uncoupling Agents / pharmacology Zinc / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Arsenates; 0/Cyanides; 0/Fungal Proteins; 0/Hydrazones; 0/Uncoupling Agents; 108-88-3/Toluene; 128-53-0/Ethylmaleimide; 1400-61-9/Nystatin; 50-00-0/Formaldehyde; 50-99-7/Glucose; 60-00-4/Edetic Acid; 67-43-6/Pentetic Acid; 7440-66-6/Zinc |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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