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Dissecting dynamin's role in clathrin-mediated endocytosis
Marcel Mettlen1, Thomas Pucadyil, Rajesh Ramachandran
1Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Biochemical Society Transactions
|September 17, 2009
Summary
Dynamin, crucial for clathrin-mediated endocytosis (CME), acts as both a regulator and a mechanochemical enzyme. This review highlights dynamin's dual role in CME, from pit maturation to membrane fission.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Clathrin-mediated endocytosis (CME) is a fundamental cellular process.
- The GTPase dynamin's precise role in CME has been debated.
- Existing models propose dynamin as a mechanochemical enzyme or a regulatory GTPase.
Purpose of the Study:
- To review current understanding of dynamin's function in CME.
- To reconcile conflicting models of dynamin's mechanism of action.
- To present evidence for a dual role of dynamin in CME.
Main Methods:
- Literature review of in vivo and in vitro studies.
- Analysis of experimental evidence regarding dynamin's function.
- Synthesis of findings to propose integrated models.
Main Results:
- Dynamin's function in CME is multifaceted, not limited to a single role.
- Evidence supports dynamin acting as a regulator in early CME stages.
- Dynamin also functions as a mechanochemical enzyme in later CME stages.
Conclusions:
- Dynamin plays a dual role in clathrin-mediated endocytosis.
- Dynamin monitors pit maturation and catalyzes membrane fission.
- This dual function is essential for efficient vesicle formation during CME.
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