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对RNA质量控制的结构洞察:Ro自身抗原通过其中央腔通过错误折叠的RNA结合

Adam J Stein¹, Gabriele Fuchs¹, Chunmei Fu¹

¹Department of Cell Biology, Yale University School of Medicine, New Haven, Connecticut 06510.

|May 24, 2005

概括

罗自身抗原将错误折叠的RNA结合起来,以进行质量控制. YRNAs可能会调节哪些RNAs可以与Ro结合,从而影响其在系统性红斑狼中的功能.

科学领域:

分子生物学分子生物学
结构生物学结构生物学
免疫学免疫学免疫学

背景情况:

该Ro 60 kDa自身抗原是系统性红斑狼 (SLE) 的关键标.
罗自身抗原通过结合错误折叠的小RNA来控制RNA质量.
在真核生物和细菌中,Ro自身抗原与YRNA结合.

研究的目的:

为了阐明Ro自身抗原的RNA结合的结构基础.
了解Ro自身抗原,YRNA和错误折叠RNA之间的相互作用.
研究YRNAs在Ro自身抗原功能中的潜在调节作用.

主要方法:

用X射线晶体学来确定未结合的Ro和Ro-RNA复合物的结构.
高分辨率结构分析 (1.95和2.2 Å).
位点定向突变发生,以验证RNA结合位点.

主要成果:

确定了与YRNA碎片和其他小RNA复合的Ro自身抗原的高分辨率结构.
在外表面确定了YRNA的独特结合点,并在Ro自身抗原的中心腔内错误折叠RNA.
突变发生证实了错误折叠的RNA的复合结合部位,涉及YRNA和Ro自身抗原的内部腔.

结论:

罗自身抗原对错误折叠的RNA具有特定的结合部位,这对其RNA质量控制功能至关重要.
YRNAs与Ro自身抗原的外部结合,并可能充当调节剂,控制其他RNAs对自身抗原的访问.
这些发现提供了对Ro自身抗原功能及其对SLE等自身免疫性疾病的影响的结构性见解.

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