端粒酶蛋白 Pof8 C 端结构域是 LARP7 蛋白中保守的 xRRM。
Structure of telomerase protein Pof8 C-terminal domain is an xRRM conserved among LARP7 proteins.
机构信息
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA.
出版信息
RNA Biol. 2021 Aug;18(8):1181-1192. doi: 10.1080/15476286.2020.1836891. Epub 2020 Nov 1.
La-related proteins 7 (LARP7) are a class of RNA chaperones that bind the 3' ends of RNA and are constitutively associated with their specific target RNAs. In metazoa, Larp7 binds to the long non-coding 7SK RNA as a core component of the 7SK RNP, a major regulator of eukaryotic transcription. In the ciliate the LARP7 protein p65 is a component of telomerase, an essential ribonucleoprotein complex that maintains the telomeric DNA at eukaryotic chromosome ends. p65 is important for the ordered assembly of telomerase RNA (TER) with telomerase reverse transcriptase. Unexpectedly, Pof8 was recently identified as a LARP7 protein and a core component of fission yeast telomerase essential for biogenesis. LARP7 proteins have a conserved N-terminal La motif and RRM1 (La module) and C-terminal RRM2 with specific RNA substrate recognition attributed to RRM2, first structurally characterized in p65 as an atypical RRM named xRRM. Here we present the X-ray crystal structure and NMR studies of Pof8 RRM2. Sequence and structure comparison of Pof8 RRM2 to p65 and human Larp7 xRRMs reveals conserved features for RNA binding with the main variability in the length of the non-canonical helix α3. This study shows that Pof8 has conserved xRRM features, providing insight into TER recognition and the defining characteristics of the xRRM.
La 相关蛋白 7(LARP7)是一类 RNA 伴侣,可结合 RNA 的 3' 端,并与特定的靶 RNA 持续相关。在后生动物中,Larp7 作为 7SK RNP 的核心成分与长非编码 7SK RNA 结合,是真核转录的主要调节剂。在纤毛虫中,LARP7 蛋白 p65 是端粒酶的组成部分,端粒酶是一种维持真核染色体末端端粒 DNA 的必需核蛋白复合物。p65 对于端粒酶 RNA(TER)与端粒酶逆转录酶的有序组装很重要。出乎意料的是,最近发现 Pof8 是 LARP7 蛋白和裂殖酵母端粒酶的核心成分,对于端粒酶的生物发生是必需的。LARP7 蛋白具有保守的 N 端 La 基序和 RRM1(La 模块)和 C 端 RRM2,特定的 RNA 底物识别归因于 RRM2,首先在 p65 中作为非典型 RRM 进行结构表征,称为 xRRM。在这里,我们展示了 Pof8 RRM2 的 X 射线晶体结构和 NMR 研究。Pof8 RRM2 与 p65 和人 Larp7 xRRMs 的序列和结构比较揭示了 RNA 结合的保守特征,主要变异性在于非典型螺旋 α3 的长度。这项研究表明 Pof8 具有保守的 xRRM 特征,为 TER 识别和 xRRM 的定义特征提供了深入了解。
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