期刊
JOURNAL OF NUTRITIONAL BIOCHEMISTRY
卷 24, 期 10, 页码 1697-1708出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jnutbio.2013.02.010
关键词
Zinc transporter; SLC39A11/ZIP11; ZIP family; MRE; MTF-1; Zinc homeostasis
资金
- National Natural Science Foundation of China [31225013, 31030039, 30901193, 81100943]
- Shanghai Key Laboratory of Pediatric Gastroenterology and Nutrition [11DZ2260500]
- China Postdoctoral Science Foundation [2012M510902]
- SIBS-CAS Outstanding Youth Fellowship [2010KIP309]
- Zhejiang University
Cellular zinc influx and efflux are maintained by two major transporter families, the ZIP (SLC39A) and ZnT (SLC30A or CDF) molecules. The functions of one molecule in this class, ZIP11/SLC39A11, remain unclear. Bioinformatics analysis of the distribution and evolutionary relationships of different ZIP members in eukaryotes and prokaryotes indicated that Zip11, the sole member of gufA subfamily, is an ancient ZIP family member that might have originated in early eukaryotic ancestors. Murine Zip11 mRNA is abundantly expressed in testes and the digestive system including stomach, ileum and cecum. Analysis of cellular zinc content, metallothionein levels, and cell viability under high or low zinc conditions in cells transfected with a murine Zip11 expression plasmid, suggest that Zip11 is a zinc importer. Further, cellular zinc concentrations and metallothionein levels decreased when Zip11 was knocked down. In mice supplemented with zinc, both mRNA and protein levels of Zip11 were slightly up-regulated in several tissues. The metal response element sequences (MREs) upstream of the first exon of Zip11 responded to elevated extracellular zinc concentrations, as assessed by luciferase reporter assays. Mutagenic analysis showed that several of the MREs could regulate Zip11 promoter activity, and metal-responsive transcription factor-1 (MTF-1) was shown to be involved in this process. Collectively, these data suggest that Zip11 has unique protein sequence and structure features, it functions as a cellular zinc transporter, and its expression is at least partially regulated by zinc via hMTF-1 binding to MREs of the Zip11 promoter. (c) 2013 Elsevier Inc. All rights reserved.
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