ZnuABC: Difference between revisions
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Revision as of 20:45, 10 February 2016
ZnuABC is a high-affinity transporter protein specialized for transporting zinc ions as part of a system for metal ion homeostasis in bacteria. The complex is a member of the ATP-binding cassette transporter (ABC transporter) protein family. The transporter contains three protein components:[1][2]
- ZnuA, a periplasmic zinc-binding protein.
- ZnuB, an integral membrane protein that transports zinc across the cytoplasmic membrane.
- ZnuC, an ATPase responsible for coupling ion transport to ATP hydrolysis.
The expression of ZnuABC is regulated by the zinc uptake regulator (Zur) protein and is induced by conditions of zinc starvation. Because zinc is often a limiting factor in bacterial infections, some pathogenic bacteria are heavily dependent on ZnuABC to scavenge zinc from the environment in an animal host.[3]
The periplasmic protein ZnuA interacts with ZinT, another component of the regulon controlled by Zur, which is also involved in periplasmic zinc homeostasis.[3][4][5][6]
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References
- ^ Patzer, SI; Hantke, K (June 1998). "The ZnuABC high-affinity zinc uptake system and its regulator Zur in Escherichia coli". Molecular microbiology. 28 (6): 1199–210. PMID 9680209.
- ^ Yatsunyk, LA; Easton, JA; Kim, LR; Sugarbaker, SA; Bennett, B; Breece, RM; Vorontsov, II; Tierney, DL; Crowder, MW; Rosenzweig, AC (February 2008). "Structure and metal binding properties of ZnuA, a periplasmic zinc transporter from Escherichia coli". Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry. 13 (2): 271–88. PMID 18027003.
- ^ a b Gabbianelli, R; Scotti, R; Ammendola, S; Petrarca, P; Nicolini, L; Battistoni, A (21 February 2011). "Role of ZnuABC and ZinT in Escherichia coli O157:H7 zinc acquisition and interaction with epithelial cells". BMC microbiology. 11: 36. PMID 21338480.
- ^ Ilari, A; Alaleona, F; Tria, G; Petrarca, P; Battistoni, A; Zamparelli, C; Verzili, D; Falconi, M; Chiancone, E (January 2014). "The Salmonella enterica ZinT structure, zinc affinity and interaction with the high-affinity uptake protein ZnuA provide insight into the management of periplasmic zinc". Biochimica et biophysica acta. 1840 (1): 535–44. PMID 24128931.
- ^ Petrarca, P; Ammendola, S; Pasquali, P; Battistoni, A (March 2010). "The Zur-regulated ZinT protein is an auxiliary component of the high-affinity ZnuABC zinc transporter that facilitates metal recruitment during severe zinc shortage". Journal of bacteriology. 192 (6): 1553–64. PMID 20097857.
- ^ Blindauer, CA (18 March 2015). "Advances in the molecular understanding of biological zinc transport". Chemical communications (Cambridge, England). 51 (22): 4544–63. PMID 25627157.