Dictyostelium chemotaxis: essential Ras activation and accessory signalling pathways for amplification.

Abstract:

:Central to chemotaxis is the molecular mechanism by which cells exhibit directed movement in shallow gradients of a chemoattractant. We used Dictyostelium mutants to investigate the minimal requirements for chemotaxis, and identified a basal signalling module providing activation of Ras at the leading edge, which is sufficient for chemotaxis. The signalling enzymes PI3K, TorC2, PLA2 and sGC are not required for Ras activation and chemotaxis to folate or to steep gradients of cAMP, but they provide a memory of direction and improved orientation of the cell, which together increase the sensitivity about 150-fold for chemotaxis in shallow cAMP gradients.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Kortholt A,Kataria R,Keizer-Gunnink I,Van Egmond WN,Khanna A,Van Haastert PJ

doi

10.1038/embor.2011.210

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

1273-9

issue

12

eissn

1469-221X

issn

1469-3178

pii

embor2011210

journal_volume

12

pub_type

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