The translational hop junction and the 5' transcriptional start site for the Prevotella loescheii adhesin encoded by plaA.

The translational hop junction and the 5' transcriptional start site for the Prevotella loescheii adhesin encoded by plaA.
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plaA 编码的普氏菌粘附素的翻译跳跃连接和 5 转录起始位点。

DOI:
10.1007/pl00006766
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发表时间:
1999
影响因子:
2.6
通讯作者:
Nguyen,NY
Nguyen,NY
中科院分区:
生物学4区
文献类型:
--
作者:
Manch-Citron,JN;Dey,A;Schneider,R;Nguyen,NY

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该基因在一个小的开放阅读框(ORF-1)和一个大的开放阅读框(ORF-2)之间存在一个编码区。plaAmRNA的翻译需要绕过plaA转录本上的29-nt编码缺口。我们已经确定了SO 34粘附素的N-末端肽序列超出差距序列。该序列表明ORF-1和ORF-2之间的肽连接在粘附素中是连续的,并支持通过核糖体跳跃机制发生SO 34粘附素合成的结论。为了阐明上游信号,我们使用5′ RACE(cDNA末端快速扩增)技术定位plaAmRNA的起始点。质粒的5′ RACE产物经DNA序列测定位于plaAmRNA的5′端,位于plaA起始密码子上游270 nt处。对应于脆弱拟杆菌启动子共有序列的区域位于该起始位点之前。
ThePrevotella loescheiiadhesin gene,plaA, contains a coding gap between a small open reading frame (ORF-1) and a large open reading frame (ORF-2). Translation of theplaAmRNA requires bypassing this 29-nt coding gap on theplaAtranscript. We have determined the N-terminal peptide sequence of the SO34 adhesin beyond the gap sequence. This sequence shows that the peptide junction between ORF-1 and ORF-2 is continuous in the adhesin and supports the conclusion that synthesis of the SO34 adhesin occurs by a ribosomal hop mechanism. To elucidate upstream signals, we used the 5′ RACE (rapid amplification of cDNA ends) technique to map the start point of theplaAmRNA. DNA sequencing of plasmids with the 5′ RACE products placed the 5′ end ofplaAmRNA 270 nt upstream from theplaAstart codon. A region corresponding to aBacteroides fragilispromoter consensus sequence precedes this start site.
DOI: 10.1038/ki.1992.264
发表时间: 1992-07
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