Huang Y, Wang J, Shalom A, Li Z, Khorchid A, Wainberg M A, Kleiman L
Lady Davis Institute for Medical Research, Jewish General Hospital, Quebec, Canada.
J Virol. 1997 Jan;71(1):726-8. doi: 10.1128/JVI.71.1.726-728.1997.
In human immunodeficiency virus type 1, tRNALys3 is placed upon the primer binding site, where it serves as the primer for reverse transcription. We show herein that genomic placement occurs independently of precursor protein processing and that the placed tRNALys3 exists in two major forms: unextended or in a form extended by the first two DNA bases incorporated, C and T. The two-base extended form of the tRNALys3 is absent in a protease-negative mutant, indicating a requirement for mature viral proteins to initiate reverse transcription within the virus.
在1型人类免疫缺陷病毒中,tRNALys3位于引物结合位点上,在那里它作为逆转录的引物。我们在此表明,基因组定位独立于前体蛋白加工而发生,并且定位的tRNALys3以两种主要形式存在:未延伸的形式或由最初掺入的两个DNA碱基(C和T)延伸的形式。tRNALys3的两碱基延伸形式在蛋白酶阴性突变体中不存在,这表明需要成熟的病毒蛋白来启动病毒内的逆转录。