Actin cross-linking proteins cortexillin I and II are required for cAMP signaling during Dictyostelium chemotaxis and development.

Abstract:

:Starvation induces Dictyostelium amoebae to secrete cAMP, toward which other amoebae stream, forming multicellular mounds that differentiate and develop into fruiting bodies containing spores. We find that the double deletion of cortexillin (ctx) I and II alters the actin cytoskeleton and substantially inhibits all molecular responses to extracellular cAMP. Synthesis of cAMP receptor and adenylyl cyclase A (ACA) is inhibited, and activation of ACA, RasC, and RasG, phosphorylation of extracellular signal regulated kinase 2, activation of TORC2, and stimulation of actin polymerization and myosin assembly are greatly reduced. As a consequence, cell streaming and development are completely blocked. Expression of ACA-yellow fluorescent protein in the ctxI/ctxII-null cells significantly rescues the wild-type phenotype, indicating that the primary chemotaxis and development defect is the inhibition of ACA synthesis and cAMP production. These results demonstrate the critical importance of a properly organized actin cytoskeleton for cAMP-signaling pathways, chemotaxis, and development in Dictyostelium.

journal_name

Mol Biol Cell

authors

Shu S,Liu X,Kriebel PW,Daniels MP,Korn ED

doi

10.1091/mbc.E11-09-0764

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

390-400

issue

2

eissn

1059-1524

issn

1939-4586

pii

mbc.E11-09-0764

journal_volume

23

pub_type

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