Stable nucleosome positioning and complete repression by the yeast alpha 2 repressor are disrupted by amino-terminal mutations in histone H4.

Stable nucleosome positioning and complete repression by the yeast alpha 2 repressor are disrupted by amino-terminal mutations in histone H4.
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组蛋白 H4 的氨基末端突变会破坏稳定的核小体定位和酵母 α2 阻遏物的完全抑制。

DOI:
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发表时间:
1992
影响因子:
10.5
通讯作者:
R. Simpson
R. Simpson
中科院分区:
生物学1区
文献类型:
--
作者:
S. Roth;M. Shimizu;L. Johnson;M. Grunstein;R. Simpson

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在酵母阻遏物α 2存在的情况下,核小体位于含有α 2操纵基因的微型染色体中,并位于α 2调节的α细胞特异性基因的启动子上。为了研究α 2通过与核心颗粒的组分相互作用来指导核小体位置的可能性,我们分析了在组蛋白H4的氨基末端区域含有突变的α细胞中邻近操作子的染色质结构。组蛋白H4中特定氨基酸的缺失或点突变改变了与α 2操纵子相邻的核小体的位置和/或稳定性。染色质结构的这些变化伴随着α 2控制下的β-半乳糖苷酶报告构建体的部分去阻遏,即使α 2仍然与其操纵基因序列结合。我们的数据表明,完全抑制α 2需要稳定定位的核小体在启动子区域,这种定位涉及保守的氨基末端区域的组蛋白H4。
Nucleosomes are positioned in the presence of the yeast repressor alpha 2 in minichromosomes containing the alpha 2 operator and on the promoters of a-cell-specific genes regulated by alpha 2. To investigate the possibility that alpha 2 directs nucleosome position through an interaction with a component of the core particle, we analyzed chromatin structures adjacent to the operator in alpha cells containing mutations in the amino-terminal region of histone H4. Deletion or point mutation of specific amino acids in histone H4 altered the location and/or stability of nucleosomes adjacent to the alpha 2 operator. These changes in chromatin structure were accompanied by partial derepression of a beta-galactosidase reporter construct under alpha 2 control, even though alpha 2 remained bound to its operator sequence. Our data suggest that complete repression by alpha 2 requires stable positioning of nucleosomes in promoter regions and this positioning involves the conserved amino-terminal region of histone H4.
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