Cited by 490Bacterial Genetics and BiotechnologyTrace Elements in HealthEscherichia coli research studies

The ZnuABC high‐affinity zinc uptake system and its regulator Zur in Escherichia coli

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Patzer, Silke I., Hantke, Klaus·1998·Molecular Microbiology

Abstract

In Escherichia coli, lacZ operon fusions were isolated that were derepressed under iron repletion and repressed under iron depletion. Two fusions were localized in genes that formed an operon whose gene products had characteristics of a binding protein‐dependent transport system. The growth defect of these mutants on TY medium containing 5 mM EGTA was compensated for by the addition of Zn 2+. In the presence of 0.5 mM EGTA, only the parental strain was able to take up 65 Zn 2+. This high‐affinity transport was energized by ATP. The genes were named znuACB (for zinc uptake; former name yebLMI ) and localized at 42 min on the genetic map of E. coli. At high Zn 2+ concentrations, the znu mutants took up more 65 Zn 2+ than the parental strain. The high‐affinity 65 Zn 2+ uptake was repressed by growth in the presence of 10 μM Zn 2+. A znuA–lacZ operon fusion was repressed by 5 μM Zn 2+ and showed a more than 20‐fold increase in β‐galactosidase activity when Zn 2+ was bound to 1.5 μM TPEN [tetrakis‐(2‐pyridylmethyl) ethylenediamine]. To identify the Zn 2+‐dependent regulator, constitutive mutants were isolated and tested for complementation by a gene bank of E. coli. A complementing gene, yjbK of the E. coli genome, was identified and named zur (for zinc uptake regulation). The Zur protein showed 27% sequence identity with the iron regulator Fur. High‐affinity 65 Zn 2+ transport of the constitutive zur mutant was 10‐fold higher than that of the uninduced parental strain. An in vivo titration assay suggested that Zur binds to the bidirectional promoter region of znuA and znuCB.

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Crossref · 10.1046/j.1365-2958.1998.00883.x

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  • ZnuABC is a high-affinity ABC-type zinc transporter best characterized in E. coli.

    “ZnuABC is a high-affinity ABC-type zinc transporter best characterized in E. coli, consisting of a periplasmic binding protein (ZnuA), membrane permease (ZnuB), and ATPase (ZnuC) [196].”
  • The ZnuABC system is regulated by Zur, such that zinc import is repressed in zinc-replete conditions.

    “The ZnuABC system is regulated by Zur, a metallo-regulatory protein of the Fur family, such that zinc import is repressed in zinc-replete conditions [196].”

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Research works printed but not linked: 2

  1. Sambrook, J., Fritsch, E.F., and Maniatis, T. (1989) Molecular Cloning: a Laboratory Manual, 2nd edn. Cold Spring Har- bor, NY: Cold Spring Harbor Laboratory Press.
  2. Ausubel, F.M., Brent, R., Kingston, R.E., Moore, D.D., Seidman, J.G., Smith, J.A., and Struhl, K. (eds.). New York: John Wiley & Sons.

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Authors
Patzer, S. I., & Hantke, K.
Affiliations
University of Tübingen (DE)
Corresponding author
Hantke, Klaus
Venue
Molecular Microbiology
Publisher
Wiley
Published
1998-06
Volume
28
Issue
6
Pages
1199-1210
ISSN
  • 0950-382X (ISSN-L)
  • 1365-2958
OpenAlex
W2139802399
Cited by
490
References
53
Citations by year
2026: 19 · 2025: 12 · 2024: 19 · 2023: 9 · 2022: 18 · 2021: 25 · 2020: 12 · 2019: 22 · 2018: 22 · 2017: 23 · 2016: 17 · 2015: 18 · 2014: 18 · 2013: 20 · 2012: 22
FWCI
7.61
Type
journal article
Language
en
Open access
Locations
  • Molecular Microbiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Escherichia coli research studies
Keywords
Zur, zinc uptake, binding protein-dependent transport, iron regulation, transcriptional regulation, Escherichia coli
MeSH terms
Amino Acid Sequence, Autoradiography, Bacterial Proteins, beta-Galactosidase, Chromosome Mapping, DNA-Binding Proteins, Electrophoresis, Polyacrylamide Gel, Escherichia coli, Genes, Regulator, Genetic Complementation Test, Lac Operon, Molecular Sequence Data, Mutation, Operon, Time Factors, Zinc, Gene Expression Regulation, Bacterial, Ion Transport, ATP-Binding Cassette Transporters, Artificial Gene Fusion, Escherichia coli Proteins

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