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Related Experiment Video

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Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro

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Published on: January 11, 2017

Kalirin12 interacts with dynamin.

Xiaonan Xin¹, Chana A Rabiner, Richard E Mains

¹Neuroscience Department, University of Connecticut Health Center, Farmington, USA. xin@nso.uchc.edu

BMC Neuroscience

|June 19, 2009

Summary

Kalirin12 binds dynamin, impacting membrane trafficking and cytoskeletal dynamics. This interaction is crucial for cellular processes like endocytosis and neuronal development.

Area of Science:

Cell Biology
Molecular Neuroscience
Protein Interactions

Background:

Guanine nucleotide exchange factors (GEFs) and Rho GTPases are key regulators of cytoskeletal dynamics and membrane trafficking.
Dynamin, a GTPase, is essential for membrane tubulation and fission.
Kalirin12, a neuronal RhoGEF, is present in growth cones and dendritic spines.

Purpose of the Study:

To investigate the interaction between Kalirin12 and dynamin.
To determine the functional consequences of this interaction on cellular processes.

Main Methods:

Co-immunoprecipitation to detect Kalirin12-dynamin2 interaction in embryonic brain.
In vitro assays using purified recombinant proteins to assess binding and inhibition of dynamin oligomerization.

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Expression of exogenous Kalirin12 and its domains in PC12 cells and cortical neurons to study effects on transferrin endocytosis.

Main Results:

The IgFn domain of Kalirin12 directly binds dynamin1 and dynamin2.
An inactivating mutation in dynamin's GTPase domain reduces this interaction.
Kalirin12 inhibits dynamin's liposome-induced oligomerization and disrupts clathrin-mediated endocytosis in cell lines and neurons.

Conclusions:

Kalirin12's IgFn domain mediates interaction with dynamin.
Kalirin12 may coordinate Rho GTPase-driven cytoskeletal changes with dynamin-mediated membrane trafficking.