ヤマニシ　ハルヨ   Haruyo Yamanishi   山西　治代    所属   川崎医科大学  医学部 基礎医学　解剖学    職種   講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	RNA cleavage linked with ribosomal action.
掲載誌名	正式名：Genetics ISSNコード：00166731
掲載区分	国外
巻・号・頁	171,pp.419-25
著者・共著者	Yamanishi H, Yonesaki T
発行年月	2005/10
概要	Ribonuclease LS in Escherichia coli is a potential antagonist of bacteriophage T4. When T4 dmd is mutated, this RNase efficiently cleaves T4 mRNAs and leads to the silencing of late genes, thus blocking T4 growth. We previously found that, when two consecutive ochre codons were placed in the open reading frame of T4 soc, RNase LS cleaved soc mRNA at a specific site downstream of the ochre codons. Here, we demonstrate that RNase LS cleaves soc RNA at the same site even when only a single ochre codon is present or is replaced with either an amber or an opal codon. On the other hand, disruption of the Shine-Dalgarno sequence, a ribosome-binding site required for the initiation of translation, eliminates the cleavage. These results strongly suggest that RNase LS cleaves in a manner dependent on translation termination. Consistent with this suggestion, the cleavage dependency on an amber codon was considerably reduced in the presence of amber-codon-suppressing tRNA. Instead, two other cleavages that depend on translation of the region containing the target sites occurred farther downstream. Additional analysis suggests that an interaction of the ribosome with a stop codon might affect the site of cleavage by RNase LS in an mRNA molecule. This effect of the ribosome could reflect remodeling of the high-order structure of the mRNA molecule.
researchmap用URL	https://academic.oup.com/genetics/article/171/2/419/6060670?login=true