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Title: Cortactin adopts a globular conformation and bundles actin into sheets.
Authors: Cowieson, NP
King, GJ
Cookson, DJ
Ross, I
Huber, T
Hume, DA
Kobe, B
Martin, JL
Keywords: Proteins
Cell cultures
Issue Date: 6-Jun-2008
Publisher: American Society for Biochemistry and Molecular Biology
Citation: Cowieson, N. P., King, G., Cookson, D., Ross, I., Huber, T., Hume, D. A., Kobe, B., & Martin, J. L. (2008). Cortactin adopts a globular conformation and bundles actin into sheets. Journal of Biological Chemistry, 283(23), 16187-16193. doi:doi:10.1074/jbc.M708917200
Abstract: Cortactin is a filamentous actin-binding protein that plays a pivotal role in translating environmental signals into coordinated rearrangement of the cytoskeleton. The dynamic reorganization of actin in the cytoskeleton drives processes including changes in cell morphology, cell migration, and phagocytosis. In general, structural proteins of the cytoskeleton bind in the N-terminal region of cortactin and regulatory proteins in the C-terminal region. Previous structural studies have reported an extended conformation for cortactin. It is therefore unclear how cortactin facilitates cross-talk between structural proteins and their regulators. In the study presented here, circular dichroism, chemical cross-linking, and small angle x-ray scattering are used to demonstrate that cortactin adopts a globular conformation, thereby bringing distant parts of the molecule into close proximity. In addition, the actin bundling activity of cortactin is characterized, showing that fully polymerized actin filaments are bundled into sheet-like structures. We present a low resolution structure that suggests how the various domains of cortactin interact to coordinate its array of binding partners at sites of actin branching. © 2008, American Society for Biochemistry and Molecular Biology
Gov't Doc #: 1438
ISSN: 0021-9258
Appears in Collections:Journal Articles

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