G{alpha}5 subunit-mediated signalling requires a D-motif and the MAPK ERK1 in Dictyostelium.

G{alpha}5 subunit-mediated signalling requires a D-motif and the MAPK ERK1 in Dictyostelium.
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G{alpha}5 亚基介导的信号传导需要盘基网柄菌中的 D 基序和 MAPK ERK1。

DOI:
10.1099/mic.0.036541-0
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发表时间:
2010
期刊:
Microbiology (Reading, England)
影响因子:
--
通讯作者:
Hadwiger,JeffreyA
Hadwiger,JeffreyA
中科院分区:
--
文献类型:
--
作者:
Raisley,Brent;Nguyen,Hoai-Nghia;Hadwiger,JeffreyA

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在多细胞发育过程中,网柄藻G α5亚基可降低细胞活力,抑制叶酸趋化性,促进顶端形态发生和基因表达。Gα5亚基氨基端D基序(丝裂原活化蛋白激酶对接位点)的改变或细胞外信号调节激酶(ERK)1的缺失可降低与Gα5亚基过表达或组成性激活相关的致死性。Gα5亚基的氨基端D基序也被发现是与Gα5亚基过表达相关的细胞大小减小、小聚集体形成和早熟发育基因表达所必需的。该D基序也有助于表达组成型活性Gα5亚基的细胞的聚集延迟,但D基序不是抑制叶酸趋化性所必需的。这些结果表明,氨基端D基序是必需的,但不是所有的表型与Gα5亚基功能升高在生长和发育过程中,ERK 1可以在Gα5亚基介导的信号转导中发挥作用。
TheDictyosteliumGα5 subunit has been shown to reduce cell viability, inhibit folate chemotaxis and accelerate tip morphogenesis and gene expression during multicellular development. Alteration of the D-motif (mitogen-activated protein kinase docking site) at the amino terminus of the Gα5 subunit or the loss of extracellular signal-regulated kinase (ERK)1 diminished the lethality associated with the overexpression or constitutive activation of the Gα5 subunit. The amino-terminal D-motif of the Gα5 subunit was also found to be necessary for the reduced cell size, small aggregate formation and precocious developmental gene expression associated with Gα5 subunit overexpression. This D-motif also contributed to the aggregation delay in cells expressing a constitutively active Gα5 subunit, but the D-motif was not necessary for the inhibition of folate chemotaxis. These results suggest that the amino-terminal D-motif is required for some but not all phenotypes associated with elevated Gα5 subunit functions during growth and development and that ERK1 can function in Gα5 subunit-mediated signal transduction.
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