Specific site selection in RNA resulting from a combination of nonspecific secondary structure and -CCR- boxes: initiation of minus strand synthesis by turnip yellow mosaic virus RNA-dependent RNA polymerase.
Specific site selection in RNA resulting from a combination of nonspecific secondary structure and -CCR- boxes: initiation of minus strand synthesis by turnip yellow mosaic virus RNA-dependent RNA polymerase.
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由非特异性二级结构和-CCR-盒组合产生的RNA中的特异性位点选择:萝卜黄花叶病毒RNA依赖性RNA聚合酶启动负链合成。
DOI:
10.1017/s1355838298980694
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发表时间:
1998
期刊:
影响因子:
--
通讯作者:
Dreher,TW
中科院分区:
文献类型:
--
作者:
Singh,RN;Dreher,TW
A turnip yellow mosaic virus RNA-dependent RNA polymerase activity was used to study the template requirements for in vitro minus strand synthesis, which is initiated specifically opposite the 3′-CCA that terminates the 3′-tRNA-like structure. A deletion survey confirmed earlier results suggesting the absence of minus strand promoter elements upstream of the pseudoknotted acceptor stem and 3′-terminus. Reiteration of this 27-nt domain provided two competing initiation sites. By varying the added downstream element, it was shown that the pseudoknotted domain could be functionally replaced by various simple stem/loops, although with some decrease in activity. The addition of varying numbers of consecutive -CCA- triplets to the 3′ end of the tRNA-like structure resulted in accurate initiation from each added triplet. A similar spectrum of initiations occurred with an unstructured RNA consisting of 12 consecutive -CCA- triplets and no additional viral sequence. Substitution mutations revealed no influence on minus strand synthesis of the identity of the nucleotide immediately upstream of a -CC- initiation site, but a preference for a purine immediately downstream. The introduction of secondary structure into the linear template showed that the usage of potential -CCR- initiation sites is influenced by nonspecific secondary structure. We conclude that specificity arises from the requirement that a -CCR- sequence be sterically accessible. This mechanism is only applicable to interactions that do not involve RNA unwinding during site selection, but may be used commonly in positive strand RNA virus replication and be applicable to other RNA–protein interactions.
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DOI:
--
发表时间:
1997
期刊:
RNA: A publication of the RNA Society
影响因子:
--
作者:
H. Guan;C. Song;A. Simon
通讯作者:
A. Simon
DOI:
10.1006/viro.1997.8621
发表时间:
1997
期刊:
Virology.
影响因子:
--
作者:
Singh,RN;Dreher,TW
通讯作者:
Dreher,TW
影响因子:
5.6
作者:
MILLER, WA;BUJARSKI, JJ;HALL, TC
通讯作者:
HALL, TC
DOI:
--
发表时间:
1970
期刊:
影响因子:
--
作者:
R. Matthews
通讯作者:
R. Matthews
DOI:
10.1006/viro.1997.8475
发表时间:
1997
期刊:
Virology.
影响因子:
--
作者:
Goodwin,JB;Skuzeski,JM;Dreher,TW
通讯作者:
Dreher,TW