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复制的局部化起源于S. cerevisiae中的ARS等离子体

B J Brewer¹, W L Fangman

¹Department of Genetics, University of Washington, Seattle 98195.

|November 6, 1987

概括

酵母等离子体的复制产生了甲型中间体. 研究人员证实,自主复制序列 (ARS) 作为Saccharomyces cerevisiae复制的特定起源,支持一个长期存在的假设.

科学领域:

分子生物学分子生物学
酵母遗传学酵母遗传学
质粒生物学质粒生物学

背景情况:

了解真核生物中的等离子体复制机制至关重要.
自主复制序列 (ARS) 作为复制起源的作用已被假设,但需要直接的实验验证.
酵母等离子体,特别是2微米等离子体,作为研究DNA复制的宝贵模型.

研究的目的:

用先进的凝电泳技术分析酵母等离子体的复制中间体.
为了确定这些等离子体内的复制起源的精确位置和功能.
提供实验证据支持ARS元素作为Saccharomyces cerevisiae复制的起源的作用.

主要方法:

采用二维阿加罗斯凝电泳来分析复制中间体.
研究了含有ARS1元素的重组等离子体和原生2微米等离子体.
在不同的电泳条件下,对形复制中间体进行了限制碎片分析.

主要成果:

复制中间体表现出特有的甲型 (Cairns) 形状,分解成链状单体.
不同的限制片段显示出不同的迁移模式,表明复制分叉和气泡.
对二维凝图案的分析证实了每个等离子体的单一,特定的复制来源,精确地映射到ARS元素.

结论:

这项研究为ARS元素作为酵母复制的特定起源而起作用的假设提供了强有力的实验支持.
复制始于一个定义的ARS位点,通过theta中间体进行,并解决catenanes.
这些发现巩固了对Saccharomyces cerevisiae中真核等离子体复制启动的理解.

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