CALM supports clathrin-coated vesicle completion upon membrane tension increase.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34155137.
- Also identified by DOI 10.1073/pnas.2010438118 and PMC identifier 8237669.
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Abstract
The most represented components of clathrin-coated vesicles (CCVs) are clathrin triskelia and the adaptors clathrin assembly lymphoid myeloid leukemia protein (CALM) and the heterotetrameric complex AP2. Investigation of the dynamics of AP180-amino-terminal-homology (ANTH) recruitment during CCV formation has been hampered by CALM toxicity upon overexpression. We used knock-in gene editing to express a C-terminal-attached fluorescent version of CALM, while preserving its endogenous expression levels, and cutting-edge live-cell microscopy approaches to study CALM recruitment at forming CCVs. Our results demonstrate that CALM promotes vesicle completion upon membrane tension increase as a function of the amount of this adaptor present. Since the expression of adaptors, including CALM, differs among cells, our data support a model in which the efficiency of clathrin-mediated endocytosis is tissue specific and explain why CALM is essential during embryogenesis and red blood cell development.
Medical subject headings
- Cell Membrane
- Clathrin-Coated Vesicles
- Monomeric Clathrin Assembly Proteins