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Multivalent endosome targeting by homodimeric EEA1.

J J Dumas¹, E Merithew, E Sudharshan

¹Program in Molecular Medicine and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.

|December 14, 2001

Summary

Early endosome autoantigen uses its C-terminal region for localization. This region

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Area of Science:

Cell Biology
Structural Biology
Molecular Biology

Background:

Early endosome autoantigen is crucial for endosomal trafficking.
Its C-terminal region mediates localization to early endosomes.
This region contains key functional motifs: calmodulin binding, Rab5 interaction, and FYVE domain.

Purpose of the Study:

To elucidate the structural basis of early endosome autoantigen localization.
To understand the mechanism of endosomal membrane engagement and tethering.

Main Methods:

X-ray crystallography to determine the structure of the C-terminal region.
Biochemical assays to study protein-lipid and protein-protein interactions.

Main Results:

The C-terminal region forms a quaternary assembly with a coiled coil and FYVE domain homodimer.
Structural and biochemical data reveal a multivalent mechanism for endosomal localization.
A unique membrane engagement mode was identified, explaining endosome tethering.

Conclusions:

Endosomal localization is achieved through amplified weak affinities via domain organization, dimerization, and quaternary structure.
The quaternary structure provides insights into the structural basis of endosome tethering.