STRUCTURE, GATING, AND REGULATION OF THE CFTR ANION CHANNEL

Area of Science:

• Molecular Biology
• Biochemistry
• Structural Biology

Background:

• The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel essential for epithelial salt and water transport.
• CFTR mutations lead to cystic fibrosis (CF), a severe genetic disorder.
• CFTR comprises transmembrane domains (TMDs) forming the pore and cytosolic domains (NBDs, R domain) for regulation.

Purpose of the Study:

• To review the structure and mechanism of the CFTR protein.
• To highlight atomic-level insights from recent cryo-electron microscopy (cryo-EM) structures.
• To discuss CFTR gating mechanisms, regulation, and pharmacological targeting for CF treatment.

Main Methods:

• Literature review synthesizing existing research on CFTR.
• Focus on structural data, particularly from cryo-EM studies.
• Analysis of molecular mechanisms governing CFTR channel gating and regulation.

Main Results:

• Detailed description of CFTR's structural components: TMDs, NBDs, and R domain.
• Elucidation of CFTR activation via R domain phosphorylation (PKA) and gating via ATP binding/hydrolysis at NBDs.
• Summary of recent cryo-EM findings providing atomic-level structural details.

Conclusions:

• CFTR structure and ATP-dependent gating are critical for its function.
• Understanding CFTR's molecular mechanisms is key to developing effective therapies.
• Small molecules targeting CFTR ion channel function offer therapeutic potential for CF and related diseases.