Isolation of the gene encoding the Drosophila melanogaster homolog of the Saccharomyces cerevisiae GCN2 eIF-2alpha kinase.

Isolation of the gene encoding the Drosophila melanogaster homolog of the Saccharomyces cerevisiae GCN2 eIF-2alpha kinase.
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分离编码酿酒酵母 GCN2 eIF-2α 激酶的黑腹果蝇同源物的基因。

DOI:
10.1093/genetics/149.3.1495
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发表时间:
1998
期刊:
影响因子:
3.3
通讯作者:
Cavener,DR
Cavener,DR
中科院分区:
生物学2区
文献类型:
--
作者:
Olsen,DS;Jordan,B;Chen,D;Wek,RC;Cavener,DR

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从黑腹果蝇中分离到酵母GCN2 eIF-2α激酶(yGCN2)的基因组和cDNA克隆。果蝇GCN2 (dGCN2)基因的身份是由编码蛋白激酶催化结构域和组氨酸- trna合成酶同源结构域的独特序列组合以及dGCN2能够补充酵母GCN2基因缺失突变体的能力所支持的。dGCN2在酵母中对Δgcn2的互补依赖于eIF-2α的关键调控磷酸化位点(丝氨酸51)的存在。dGCN2由10个外显子组成,编码1589个氨基酸的蛋白质。dGCN2 mRNA在果蝇的整个发育过程中表达,在胚胎发生的早期阶段尤其丰富。在STS Dm2514中,dGCN2基因被细胞遗传学和物理定位到第三条染色体的右臂100C3处。考虑到酵母与果蝇和其他高等真核生物氨基酸合成途径的显著差异,GCN2在高等真核生物中的发现有些出乎意料。尽管存在这些差异,但GCN2在果蝇中的存在表明,从酵母到多细胞生物,至少部分保留了对氨基酸剥夺的反应机制。
Genomic and cDNA clones homologous to the yeast GCN2 eIF-2α kinase (yGCN2) were isolated from Drosophila melanogaster. The identity of the Drosophila GCN2 (dGCN2) gene is supported by the unique combination of sequence encoding a protein kinase catalytic domain and a domain homologous to histidyl-tRNA synthetase and by the ability of dGCN2 to complement a deletion mutant of the yeast GCN2 gene. Complementation of Δgcn2 in yeast by dGCN2 depends on the presence of the critical regulatory phosphorylation site (serine 51) of eIF-2α. dGCN2 is composed of 10 exons encoding a protein of 1589 amino acids. dGCN2 mRNA is expressed throughout Drosophila development and is particularly abundant at the earliest stages of embryogenesis. The dGCN2 gene was cytogenetically and physically mapped to the right arm of the third chromosome at 100C3 in STS Dm2514. The discovery of GCN2 in higher eukaryotes is somewhat unexpected given the marked differences between the amino acid biosynthetic pathways of yeast vs. Drosophila and other higher eukaryotes. Despite these differences, the presence of GCN2 in Drosophila suggests at least partial conservation from yeast to multicellular organisms of the mechanisms responding to amino acid deprivation.
激活酵母 eIF-2 α 激酶 GCN2 的突变:改变组氨酰-tRNA 合成酶相关结构域的等位基因分离
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