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Updated: Mar 26, 2026

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
Published on: August 10, 2021
Cellular functions of TMEM16/anoctamin
Uhtaek Oh1,2, Jooyoung Jung3
1Sensory Research Center, CRI, College of Pharmacy, Seoul National University, Seoul, 151-742, South Korea. utoh@snu.ac.kr.
Calcium-activated chloride channels (CaCCs), identified as anoctamin 1 (ANO1/TMEM16A), play crucial roles in physiological functions, pain sensation, and diseases like cancer. Recent structural studies reveal their molecular gating mechanisms.
Area of Science:
- Physiology
- Molecular Biology
- Channelopathies
Background:
- Calcium-activated chloride channels (CaCCs) are essential for numerous physiological processes.
- The molecular identity of CaCCs was established as anoctamin 1 (ANO1/TMEM16A) in 2008.
- ANO1 and its paralogs are implicated in various physiological and pathophysiological conditions.
Purpose of the Study:
- To review the diverse roles of ANO1 (TMEM16A) and its paralogs.
- To highlight ANO1's involvement in epithelial secretion, pain, smooth muscle function, and cancer.
- To discuss recent structural insights into TMEM16 channel function.
Main Methods:
- Electrophysiological studies
- Histological analyses
- Genetic investigations
- X-ray crystallography of fungal TMEM16
Main Results:
- ANO1 mediates chloride secretion in various secretory epithelia.
- ANO1 functions as a heat sensor in pain pathways and influences vascular and airway smooth muscles.
- ANO1 is upregulated in cancers and involved in proliferation.
- ANO2 is linked to olfaction, ANO6 to Scott syndrome, and ANO5 to muscle/bone diseases.
- Structural data elucidate ANO1's gating, ion conduction, and phospholipid transport mechanisms.
Conclusions:
- ANO1 (TMEM16A) is a multifunctional protein with critical roles in health and disease.
- Dysregulation of ANO1 and its paralogs contributes to various pathologies.
- Structural biology provides a molecular basis for understanding TMEM16 channel function and dysfunction.
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