In Vitro reconstitution of Cdc42-mediated actin assembly using purified components

Hsin-Yi Henry Ho, Rajat Rohatgi, Andres M. Lebensohn, Marc W. Kirschner

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

In the accompanying chapter, we describe an in vitro system that uses Xenopus egg extracts to study actin assembly induced by phosphatidylinositol (4,5)bisphosphate (PIP2) and Cdc42. Biochemical fractionation and candidate screening experiments conducted in the extract system have identified the Arp2/3 complex, the N-WASP-WIP (or N-WASP-CR16) complex, and the Cdc42-binding protein Toca-1 as important mediators of PIP2- and Cdc42-actin signaling. Toward our ultimate goal of reconstituting an in vitro system that recapitulates the signaling properties observed in vivo, we then developed a purified actin assembly assay system consisting of the regulatory components that we discovered from extracts. In these assays, the stereotypical sigmoidal kinetics of actin polymerization are monitored by pyrene-actin fluorescence in the presence of defined recombinant or purified proteins, enabling the detailed study of mechanism and protein function. In this chapter, we describe the preparation of the components used in these purified actin assembly reactions, as well as the assay conditions under which we monitor actin polymerization kinetics in vitro.

Original languageEnglish (US)
Article number14
Pages (from-to)174-190
Number of pages17
JournalMethods in Enzymology
Volume406
DOIs
StatePublished - 2006
Externally publishedYes

Fingerprint

Actins
Assays
Polymerization
cdc42 GTP-Binding Protein
Actin-Related Protein 2-3 Complex
Kinetics
Fractionation
Xenopus
Phosphatidylinositols
In Vitro Techniques
Ovum
Carrier Proteins
Screening
Proteins
Fluorescence
Experiments

ASJC Scopus subject areas

  • Biochemistry

Cite this

In Vitro reconstitution of Cdc42-mediated actin assembly using purified components. / Ho, Hsin-Yi Henry; Rohatgi, Rajat; Lebensohn, Andres M.; Kirschner, Marc W.

In: Methods in Enzymology, Vol. 406, 14, 2006, p. 174-190.

Research output: Contribution to journalArticle

Ho, Hsin-Yi Henry ; Rohatgi, Rajat ; Lebensohn, Andres M. ; Kirschner, Marc W. / In Vitro reconstitution of Cdc42-mediated actin assembly using purified components. In: Methods in Enzymology. 2006 ; Vol. 406. pp. 174-190.
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