期刊
FEMS MICROBIOLOGY LETTERS
卷 213, 期 1, 页码 121-126出版社
ELSEVIER SCIENCE BV
DOI: 10.1111/j.1574-6968.2002.tb11295.x
关键词
nitric oxide; bacterial metallothionein; zinc homeostasis; zinc ATPase; Escherichia coli
类别
Nitric oxide (NO) has a broad spectrum of signalling and regulatory functions and multiple molecular targets. Recently, the intrabacterial toxicity of NO and mechanisms for NO resistance have been intensively investigated. Here we report for the first time that NO elicits release of zinc from a bacterial protein. Using the zinc-responsive expression of zntA (encoding a Zn-exporting P-type ATPase) fused to lacZ, i.e. Phi(zntA-lacZ), to monitor intracellular zinc, and SmtA (the Synechococcus metallothionein) as zinc store, we have shown that the NO donors NOC-5 and NOC-7 elicit zinc ejection. No increase in Phi(zntA-lacZ) activity was observed in a zntR mutant, indicating the specificity of the zntA promoter response to zinc ions. (C) 2002 Federation of European Microbiological Societies. Published by Elsevier Science B.V. All rights reserved.
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