Todd S, Towner J S, Brown D M, Semler B L
Department of Microbiology and Molecular Genetics, College of Medicine, University of California, Irvine 92697, USA.
J Virol. 1997 Nov;71(11):8868-74. doi: 10.1128/JVI.71.11.8868-8874.1997.
The genomic RNA 3' noncoding region is believed to be a major cis-acting molecular genetic determinant for regulating picornavirus negative-strand RNA synthesis by promoting replication complex recognition. We report the replication of two picornavirus RNAs harboring complete deletions of the genomic RNA 3' noncoding regions. Our results suggest that while specific 3'-terminal RNA sequences and/or secondary structures may have evolved to promote or regulate negative-strand RNA synthesis, the basic mechanism of replication initiation is not strictly template specific and may rely primarily upon the proximity of newly translated viral replication proteins to the 3' terminus of template RNAs within tight membranous replication complexes.
基因组RNA 3'非编码区被认为是通过促进复制复合物识别来调节小核糖核酸病毒负链RNA合成的主要顺式作用分子遗传决定因素。我们报道了两种基因组RNA 3'非编码区完全缺失的小核糖核酸病毒RNA的复制情况。我们的结果表明,虽然特定的3'末端RNA序列和/或二级结构可能已经进化以促进或调节负链RNA合成,但复制起始的基本机制并非严格的模板特异性,可能主要依赖于新翻译的病毒复制蛋白在紧密的膜性复制复合物中与模板RNA 3'末端的接近程度。