gdt1, a new signal transduction component for negative regulation of the growth-differentiation transition in Dictyostelium discoideum.

gdt1, a new signal transduction component for negative regulation of the growth-differentiation transition in Dictyostelium discoideum.
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gdt1,一种新的信号转导元件,用于盘基网柄菌生长-分化转变的负调控。

DOI:
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发表时间:
2000
影响因子:
3.3
通讯作者:
Wolfgang Nellen
Wolfgang Nellen
中科院分区:
生物学3区
文献类型:
--
作者:
Changjiang Zeng;C. Anjard;Karsten Riemann;A. Konzok;Wolfgang Nellen

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本研究以盘基钢菌disidin I的表达为标记,筛选影响盘基钢菌生长分化转化(GDT)的突变体。通过REMI诱变,我们分离出了一个过表达盘状蛋白i的突变体2-9,它表现出正常的形态发生,但显示出过早进入发育周期。被破坏的基因被命名为gdt1。突变表型是通过基因不同部分的破坏重建的,这表明所有的基因都完全丧失了功能。Gdt1在生长细胞中表达;蛋白质和mRNA的水平随着细胞密度的增加而增加,随着发育的开始而迅速下降。gdt1编码一个175 kda的蛋白,有四个推测的跨膜结构域。在C端,衍生的氨基酸序列与蛋白激酶的催化结构域有一定的相似性。混合实验表明,gdt1(-)表型是细胞自主的。饥饿前因子在野生型水平分泌。在gdt1突变体中,对盘状蛋白表达负调节因子叶酸的反应没有受损。缺乏G蛋白alpha2的细胞表现出盘状蛋白表达的缺失,并且不聚集。gdt1(-)/Galpha2(-)双突变体没有聚集,但有强烈的盘状蛋白表达。这表明gdt1是GDT的负调节因子,位于Galpha2的下游或平行通路上。
Discoidin I expression was used as a marker to screen for mutants affected in the growth-differentiation transition (GDT) of Dictyostelium. By REMI mutagenesis we have isolated mutant 2-9, an overexpressor of discoidin I. It displays normal morphogenesis but shows premature entry into the developmental cycle. The disrupted gene was denominated gdt1. The mutant phenotype was reconstructed by disruptions in different parts of the gene, suggesting that all had a complete loss of function. gdt1 was expressed in growing cells; the levels of protein and mRNA appear to increase with cell density and rapidly decrease with the onset of development. gdt1 encodes a 175-kDa protein with four putative transmembrane domains. In the C terminus, the derived amino acid sequence displays some similarity to the catalytic domain of protein kinases. Mixing experiments demonstrate that the gdt1(-) phenotype is cell autonomous. Prestarvation factor is secreted at wild-type levels. The response to folate, a negative regulator of discoidin expression, was not impaired in gdt1 mutants. Cells that lack the G protein alpha2 display a loss of discoidin expression and do not aggregate. gdt1(-)/Galpha2(-) double mutants show no aggregation but strong discoidin expression. This suggests that gdt1 is a negative regulator of the GDT downstream of or in a parallel pathway to Galpha2.
DOI: 10.1002/dvg.1020120115
发表时间: 1991
期刊: Developmental genetics
影响因子: --
作者:
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盘基网柄菌的分子生物学:工具和应用。
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发表时间: 1987
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发表时间: 1994
期刊: Biochimica et biophysica acta
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DOI: 10.1002/dvg.1020120116
发表时间: 1991
期刊: Developmental genetics
影响因子: --
作者:
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DOI: 10.1101/gad.11.23.3218
发表时间: 1997-12-01
影响因子: 10.5
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Chen, MY;Long, Y;Devreotes, PN
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