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Biochemical Properties of Urea Transporters

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Urea Transporters

Part of the book series: Subcellular Biochemistry ((SCBI,volume 73))

Abstract

Urea and urea transporters (UT) are critical to the production of concentrated urine and hence in maintaining body fluid balance. The UT-A1 urea transporter is the major and most important UT isoform in the kidney. Native UT-A1, expressed in the terminal inner medullary collecting duct (IMCD) epithelial cells, is a glycosylated protein with two glycoforms of 117 and 97 kDa. Vasopressin is the major hormone in vivo that rapidly increases urea permeability in the IMCD through increases in phosphorylation and apical plasma-membrane accumulation of UT-A1. The cell signaling pathway for vasopressin-mediated UT-A1 phosphorylation and activity involves two cAMP-dependent signaling pathways: protein kinase A (PKA) and exchange protein activated by cAMP (Epac). In this chapter, we will discuss UT-A1 regulation by phosphorylation, ubiquitination, and glycosylation.

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Acknowledgments

This work was funded by NIH grants R01-DK087838.

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  1. Department of Physiology, and Renal Division Department of Medicine, Emory University School of Medicine, Whitehead Research Building Room 605N, 615 Michael Street, Atlanta, GA, 30322, USA

    Guangping Chen

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Correspondence to Guangping Chen .

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  1. School of Basic Medical Sciences, Department of Pharmacology, Peking University, Beijing, China

    Baoxue Yang

  2. Renal Division, Department of Medicine and Department of Physiology, Emory University School of Medicine, Atlanta, Georgia, USA

    Jeff M. Sands

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Chen, G. (2014). Biochemical Properties of Urea Transporters. In: Yang, B., Sands, J. (eds) Urea Transporters. Subcellular Biochemistry, vol 73. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9343-8_7

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