5uak: Difference between revisions

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== Function ==

[[http://www.uniprot.org/uniprot/CFTR_HUMAN CFTR_HUMAN]] Involved in the transport of chloride ions. May regulate bicarbonate secretion and salvage in epithelial cells by regulating the SLC4A7 transporter. Can inhibit the chloride channel activity of ANO1.<ref>PMID:22178883</ref>

== Publication Abstract from PubMed ==

The cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP-binding cassette (ABC) transporter that uniquely functions as an ion channel. Here, we present a 3.9 A structure of dephosphorylated human CFTR without nucleotides, determined by electron cryomicroscopy (cryo-EM). Close resemblance of this human CFTR structure to zebrafish CFTR under identical conditions reinforces its relevance for understanding CFTR function. The human CFTR structure reveals a previously unresolved helix belonging to the R domain docked inside the intracellular vestibule, precluding channel opening. By analyzing the sigmoid time course of CFTR current activation, we propose that PKA phosphorylation of the R domain is enabled by its infrequent spontaneous disengagement, which also explains residual ATPase and gating activity of dephosphorylated CFTR. From comparison with MRP1, a feature distinguishing CFTR from all other ABC transporters is the helix-loop transition in transmembrane helix 8, which likely forms the structural basis for CFTR's channel function.

Molecular Structure of the Human CFTR Ion Channel.,Liu F, Zhang Z, Csanady L, Gadsby DC, Chen J Cell. 2017 Mar 23;169(1):85-95.e8. doi: 10.1016/j.cell.2017.02.024. PMID:28340353<ref>PMID:28340353</ref>

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>

</div>

== References ==

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 == Function ==
 [[http://www.uniprot.org/uniprot/CFTR_HUMAN CFTR_HUMAN]] Involved in the transport of chloride ions. May regulate bicarbonate secretion and salvage in epithelial cells by regulating the SLC4A7 transporter. Can inhibit the chloride channel activity of ANO1.<ref>PMID:22178883</ref>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+The cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP-binding cassette (ABC) transporter that uniquely functions as an ion channel. Here, we present a 3.9 A structure of dephosphorylated human CFTR without nucleotides, determined by electron cryomicroscopy (cryo-EM). Close resemblance of this human CFTR structure to zebrafish CFTR under identical conditions reinforces its relevance for understanding CFTR function. The human CFTR structure reveals a previously unresolved helix belonging to the R domain docked inside the intracellular vestibule, precluding channel opening. By analyzing the sigmoid time course of CFTR current activation, we propose that PKA phosphorylation of the R domain is enabled by its infrequent spontaneous disengagement, which also explains residual ATPase and gating activity of dephosphorylated CFTR. From comparison with MRP1, a feature distinguishing CFTR from all other ABC transporters is the helix-loop transition in transmembrane helix 8, which likely forms the structural basis for CFTR's channel function.
+Molecular Structure of the Human CFTR Ion Channel.,Liu F, Zhang Z, Csanady L, Gadsby DC, Chen J Cell. 2017 Mar 23;169(1):85-95.e8. doi: 10.1016/j.cell.2017.02.024. PMID:28340353<ref>PMID:28340353</ref>
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
+<div class="pdbe-citations 5uak" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>