Abstract
The cystic fibrosis transmembrane conductance regulator (CFTR) is a tightly regulated anion channel expressed in epithelial and other cells. It conducts chloride and bicarbonate ions through the plasma membrane and also influences the activity of other channels and transporters through unknown mechanisms. CFTR has two membrane domains (TM1, TM2), each comprised of six trans-membrane segments, two nucleotide-binding folds (NBD1, NBD2) that bind and hydrolyze ATP, and a central regulatory or “R” domain (1). Phosphorylation of the R domain by protein kinases Table 1) stimulates channel activity and may also enhance interactions of CFTR with other proteins. This chapter describes methods that we have found useful for studying the phosphorylation and dephosphorylation of CFTR. We emphasize simple approaches for the partial purification of CFTR and for assaying kinase and phosphatase activities using either CFTR or casein as substrate.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Riordan J. R., Rommens, J. M., Kerem, B.-S., Alon, N., Rozmahel, R., Grzelczak, Z., Zielenski, J., Lok, S., Plavsic, N., Chou J.-L., Drumm, M. L., Iannuzzi, M. C., Collins, F. S., and Tsui, L.-C. (1989) Identification of the cystic fibrosis gene: cloning and characterization of complementary DNA. Science 245, 1066–1073.
Chang, X.-B., Tabcharani, J. A., Hou, Y.-X., Jensen, T. J., Kartner, N., Alon, N., Hanrahan, J. W., and Riordan, J. R. (1993) Protein kinase A (PKA) still activates CFTR chloride channel after mutagenesis of all ten PKA consensus phosphorylation sites. J. Biol. Chem. 268, 11,304–11,311.
Zhu, T., Dahan, D., Evaglelidis, A., Zheng, S.-X., Luo, J., and Hanrahan, J. W. (1999) Association of cystic fibrosis transmembrane conductance regulator and protein phosphatase 2C. J. Biol. Chem. 274 29,102–29,107.
Kartner, N. and Riordan, J. R. (1998) Characterization of polyclonal and monoclonal antibodies to cystic fibrosis transmembrane conductance regulator. Meth. Enzymol. 292, 629–652.
Luo, J., Zhu, T., Evagelidis, A., Pato, M., and Hanrahan, J. W. (2000) Role of protein phosphatases in the activation of CFTR (ABCC7) by genistein and bromotetramisole. Am. J. Physiol. (Cell Physiol.) 279, C108–C119
Cheng, S. H., Rich, D. P., Marshall, J., Gregory, R. J., Welsh, M. J., and Smith, A. E. (1991) Phosphorylation of the R domain by cAMP-dependent protein kinase regulates the CFTR chloride channel. Cell 66, 1027–1036.
Cohn, J. A., Nairn, A. C., Marino, C. R., Melhus, O., and Kole, J. (1992) Characterization of the cystic fibrosis transmembrane conductance regulator in a colonocyte cell line. Proc. Natl. Acad. Sci. USA 89, 2340–2344.
Seibert, F. S., Chang, X.-B., Aleksandrov, A. A., Clarke, D. M., Hanrahan, J. W., and Riordan, J. R. (2000) Influence of phosphorylation by protein kinase A on CFTR at the cell surface and endoplasmic reticulum. Biochim. Biophys. Acta 1461, 275–283.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2002 Humana Press Inc.
About this protocol
Cite this protocol
Zhu, T., Deborah A. R., H., Dahan, D., Evagelidis, A., Hanrahan, J.W. (2002). CFTR Regulation by Phosphorylation. In: Skach, W.R. (eds) Cystic Fibrosis Methods and Protocols. Methods in Molecular Medicine™, vol 70. Humana Press. https://doi.org/10.1385/1-59259-187-6:99
Download citation
DOI: https://doi.org/10.1385/1-59259-187-6:99
Publisher Name: Humana Press
Print ISBN: 978-0-89603-897-4
Online ISBN: 978-1-59259-187-9
eBook Packages: Springer Protocols