DOI: 10.1242/jcs.001776. Characterisation of IRTKS, a novel IRSp53/MIM family actin regulator with distinct filament bundling properties

Characterisation of IRTKS, a novel IRSp53/MIM family actin regulator with distinct filament bundling properties

10.1242/jcs.001776

Crossref journal-article

The Company of Biologists

Journal of Cell Science (237)

Abstract

IRSp53 is a scaffold protein that contains an IRSp53/MIM homology domain (IMD) that bundles actin filaments and interacts with the small GTPase Rac. IRSp53 also binds to the small GTPase Cdc42 and to Scar/WAVE and Mena/VASP proteins to regulate the actin cytoskeleton. We have characterised a novel IMD-containing protein, insulin receptor tyrosine kinase substrate (IRTKS), which has widespread tissue distribution, is a substrate for the insulin receptor and binds Rac. Unlike IRSp53, IRTKS does not interact with Cdc42. Expression of IRTKS induces clusters of short actin bundles rather than filopodia-like protrusions. This difference may be attributable to a short carboxyl-terminal (Ct) extension present on IRTKS, which resembles a WASP-homology 2 (WH2) motif. Addition of the Ct extension to IRSp53 causes an apparent shortening of bundles induced by the IMD in vitro, and in cultured cells, suggesting that the Ct extension of IRTKS modulates the organising activity of the IMD. Lastly, we could not detect actin monomer sequestration by the Ct extension of IRTKS as would be expected with a conventional WH2 motif, but it did interact with actin filaments.

Bibliography

Millard, T. H., Dawson, J., & Machesky, L. M. (2007). Characterisation of IRTKS, a novel IRSp53/MIM family actin regulator with distinct filament bundling properties. Journal of Cell Science, 120(9), 1663â1672.

Authors 3

Thomas H. Millard (first)
John Dawson (additional)
Laura M. Machesky (additional)

References 51 Referenced 72

Dates

Type	When
Created	18 years, 4 months ago (April 12, 2007, 8:13 p.m.)
Deposited	1 year, 6 months ago (Feb. 13, 2024, 4:56 a.m.)
Indexed	3 months, 3 weeks ago (May 8, 2025, 9:22 a.m.)
Issued	18 years, 3 months ago (May 1, 2007)
Published	18 years, 3 months ago (May 1, 2007)
Published Print	18 years, 3 months ago (May 1, 2007)

Funders 0

None

BibTeX

@article{Millard_2007, title={Characterisation of IRTKS, a novel IRSp53/MIM family actin regulator with distinct filament bundling properties}, volume={120}, ISSN={0021-9533}, url={http://dx.doi.org/10.1242/jcs.001776}, DOI={10.1242/jcs.001776}, number={9}, journal={Journal of Cell Science}, publisher={The Company of Biologists}, author={Millard, Thomas H. and Dawson, John and Machesky, Laura M.}, year={2007}, month=may, pages={1663–1672} }

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