ClC-7 Drives Intraphagosomal Chloride Accumulation to Support Hydrolase Activity and Phagosome Resolution

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2023 Apr 3

PMID 37010469

Authors

Jing Ze Wu

Mariia Zeziulia

Whijin Kwon

Thomas J Jentsch

Sergio Grinstein

Spencer A Freeman

Affiliations

Soon will be listed here.

Abstract

Degradative organelles contain enzymes that function optimally at the acidic pH generated by the V-ATPase. The resulting transmembrane H+ gradient also energizes the secondary transport of several solutes, including Cl-. We report that Cl- influx, driven by the 2Cl-/H+ exchanger ClC-7, is necessary for the resolution of phagolysosomes formed by macrophages. Cl- transported via ClC-7 had been proposed to provide the counterions required for electrogenic H+ pumping. However, we found that deletion of ClC-7 had a negligible effect on phagosomal acidification. Instead, luminal Cl- was found to be required for activation of a wide range of phagosomal hydrolases including proteases, nucleases, and glycosidases. These findings argue that the primary role of ClC-7 is the accumulation of (phago)lysosomal Cl- and that the V-ATPases not only optimize the activity of degradative hydrolases by lowering the pH but, importantly, also play an indirect role in their activation by providing the driving force for accumulation of luminal Cl- that stimulates hydrolase activity allosterically.

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