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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mak, D. O. Foskett, J. K. Raghuram, V. |
| Description | Author Affiliation: Raghuram V ( Department of Physiology, University of Pennsylvania, Philadelphia, PA 19104-6100, USA.); |
| Abstract | The cystic fibrosis transmembrane conductance regulator (CFTR) is a cAMP-dependent protein kinase- and ATP-regulated chloride channel, the activity of which determines the rate of electrolyte and fluid transport in a variety of epithelial tissues. Here we describe a mechanism that regulates CFTR channel activity, which is mediated by PDZ domains, a family of conserved protein-interaction modules. The Na(+)/H(+) exchanger regulatory factor (NHERF) binds to the cytoplasmic tail of CFTR through either of its two PDZ (PDZ1 and PDZ2) domains. A recombinant fragment of NHERF (PDZ1-2) containing the two PDZ domains increases the open probability (P(o)) of single CFTR channels in excised membrane patches from a lung submucosal gland cell line. Both PDZ domains are required for this functional effect, because peptides containing mutations in either domain are unable to increase channel P(o). The concentration dependence of the regulation by the bivalent PDZ1-2 domain is biphasic, i.e., activating at lower concentrations and inhibiting at higher concentrations. Furthermore, either PDZ domain alone or together is without effect on P(o), but either domain can competitively inhibit the PDZ1-2-mediated stimulation of CFTR. Our results support a molecular model in which bivalent NHERF PDZ domains regulate channel gating by crosslinking the C-terminal tails in a single dimeric CFTR channel, and the magnitude of this regulation is coupled to the stoichiometry of these interactions. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 3 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cystic Fibrosis Transmembrane Conductance Regulator Chemistry Physiology Amino Acid Sequence Animals Binding Sites CHO Cells Cell Membrane Conserved Sequence Cricetinae Genetics Ion Channel Gating Kinetics Lung Membrane Potentials Molecular Sequence Data Peptide Fragments Metabolism Recombinant Fusion Proteins Respiratory Mucosa Transfection Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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