A poly(A) binding protein functions in the chloroplast as a message-specific translation factor.

A poly(A) binding protein functions in the chloroplast as a message-specific translation factor.
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Poly(A) 结合蛋白在叶绿体中作为信息特异性翻译因子发挥作用。

DOI:
10.1073/pnas.95.5.2238
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发表时间:
1998
影响因子:
11.1
通讯作者:
Mayfield,SP
Mayfield,SP
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yohn,CB;Cohen,A;Danon,A;Mayfield,SP

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一组特异性结合ChlamycarinhardtichloroplastpsbAmRNA的5′非翻译区(UTR)的蛋白质的高亲和力结合与该信息的光调节翻译激活相关。我们已经分离出编码mainpsbARNA结合蛋白RB47的cDNA,并鉴定该蛋白为poly(A)结合蛋白家族的成员。Poly(A)结合蛋白(Poly(A)binding proteins)是一类与mRNA的Poly(A)尾结合的真核细胞质蛋白,在转录调控中起重要作用。从大肠杆菌中表达并纯化的RB47与psbA5 ′ UTR结合的特异性和亲和力与从C.莱因哈德三氯塑料在叶绿体中的一个正常的细胞质翻译因子的鉴定表明,原核类叶绿体翻译机制利用真核类起始因子来调节关键叶绿体mRNA的翻译。这些数据还表明,poly(A)结合蛋白可能在翻译调控中发挥更广泛的作用比以前认识到的。
High-affinity binding of a set of proteins with specificity for the 5′ untranslated region (UTR) of theChlamydomonas reinhardtiichloroplastpsbAmRNA correlates with light-regulated translational activation of this message. We have isolated a cDNA encoding the mainpsbARNA binding protein, RB47, and identified this protein as a member of the poly(A) binding protein family. Poly(A) binding proteins are a family of eukaryotic, cytoplasmic proteins thought to bind poly(A) tails of mRNAs and play a role in translational regulation.In vitrotranslation of RNA transcribed from the RB47 cDNA produces a precursor protein that is efficiently transported into the chloroplast and processed to the mature 47-kDa protein. RB47 expressed and purified fromEscherichia colibinds to thepsbA5′ UTR with similar specificity and affinity as RB47 isolated fromC. reinhardtiichloroplasts. The identification of a normally cytoplasmic translation factor in the chloroplast suggests that the prokaryotic-like chloroplast translation machinery utilizes a eukaryotic-like initiation factor to regulate the translation of a key chloroplast mRNA. These data also suggest that poly(A) binding proteins may play a wider role in translation regulation than previously appreciated.
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