Repression of the Drosophila proliferating-cell nuclear antigen gene promoter by zerknüllt protein

Repression of the Drosophila proliferating-cell nuclear antigen gene promoter by zerknüllt protein
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zerknüllt 蛋白对果蝇增殖细胞核抗原基因启动子的抑制

DOI:
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发表时间:
1991
影响因子:
5.3
通讯作者:
A. Matsukage
A. Matsukage
中科院分区:
生物学2区
文献类型:
--
作者:
M. Yamaguchi;F. Hirose;Y. Nishida;A. Matsukage

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将含有果蝇增殖细胞核抗原(PCNA)基因5 ′侧翼区的631 bp片段置于氯霉素乙酰转移酶(CAT)载体基因的上游。用该质粒和一组5 ′-缺失衍生物转染的果蝇Kc细胞中CAT活性的瞬时表达试验表明,启动子功能位于192-bp区域内(相对于转录起始位点为-168至+24)。与zerknüllt(zen)表达质粒共转染特异性抑制CAT表达。然而,与非功能性zen突变、偶跳或bicoid的表达质粒共转染对CAT表达无显著影响。RNA酶保护分析表明zen的抑制作用发生在转录阶段。zen的靶序列被定位在PCNA基因启动子的34 bp区域(-119至-86)内,尽管它缺乏zen蛋白结合位点。建立了携带PCNA基因调控区(-607至+137或-168至+137)与lacZ融合的转基因果蝇。当这些苍蝇与zen突变体杂交时,在携带转基因的原肠胚的背侧区域观察到lacZ的异位表达。这些结果表明,禅宗间接抑制PCNA基因的表达,可能是通过调节一些转录因子的表达,结合到PCNA基因启动子。
A 631-bp fragment containing the 5'-flanking region of the Drosophila melanogaster proliferating-cell nuclear antigen (PCNA) gene was placed upstream of the chloramphenicol acetyltransferase (CAT) gene of a CAT vector. A transient expression assay of CAT activity in Drosophila Kc cells transfected with this plasmid and a set of 5'-deletion derivatives revealed that the promoter function resided within a 192-bp region (-168 to +24 with respect to the transcription initiation site). Cotransfection with a zerknüllt (zen)-expressing plasmid specifically repressed CAT expression. However, cotransfection with expression plasmids for a nonfunctional zen mutation, even-skipped, or bicoid showed no significant effect on CAT expression. RNase protection analysis revealed that the repression by zen was at the transcription step. The target sequence of zen was mapped within the 34-bp region (-119 to -86) of the PCNA gene promoter, even though it lacked zen protein-binding sites. Transgenic flies carrying the PCNA gene regulatory region (-607 to +137 or -168 to +137) fused with lacZ were established. When these flies were crossed with the zen mutant, ectopic expression of lacZ was observed in the dorsal region of gastrulating embryos carrying the transgene with either construct. These results indicate that zen indirectly represses PCNA gene expression, probably by regulating the expression of some transcription factor(s) that binds to the PCNA gene promoter.
DOI: 10.1093/genetics/118.3.461
发表时间: 1988-03
期刊: Genetics
影响因子: 3.3
作者:
H. Robertson;C. Preston;R. Phillis;D. Johnson-Schlitz;Wendy K. Benz;W. Engels
通讯作者: H. Robertson;C. Preston;R. Phillis;D. Johnson-Schlitz;Wendy K. Benz;W. Engels
DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
作者:
Ng,L;Prelich,G;Anderson,CW;Stillman,B;Fisher,PA
通讯作者: Fisher,PA
DOI: 10.1016/0012-1606(84)90182-9
发表时间: 1984-01-01
影响因子: 2.7
作者:
WAKIMOTO, BT;TURNER, FR;KAUFMAN, TC
通讯作者: KAUFMAN, TC
DOI: 10.1016/0012-1606(89)90084-5
发表时间: 1989
影响因子: 2.7
作者:
Klingensmith,J;Noll,E;Perrimon,N
通讯作者: Perrimon,N
有丝分裂域揭示了果蝇胚胎中细胞的早期定型。
DOI: --
发表时间: 1989
期刊: Development (Cambridge, England)
影响因子: --
作者:
Foe,VE
通讯作者: Foe,VE