共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
RNA-dependent DNA polymerase in virions of RNA tumour viruses 总被引:240,自引:0,他引:240
D Baltimore 《Nature》1970,226(5252):1209-1211
3.
4.
5.
6.
7.
A mechanism for initiating RNA-dependent RNA polymerization 总被引:26,自引:0,他引:26
8.
RNA-dependent RNA synthesis in rat brain 总被引:2,自引:0,他引:2
9.
10.
11.
Bacteriophage sigma factor for RNA polymerase 总被引:17,自引:0,他引:17
A A Travers 《Nature》1969,223(5211):1107-1110
12.
13.
Normal adult rat liver contains a high level of a synthetic RNA-dependent DNA polymerase activity, which is distinct from cellular DNA-dependent polymerases. It uses poly(dT).poly(rA) and poly(rA).poly(rU) as templates but has little or no response to DNA or several single-stranded RNAs. 相似文献
14.
15.
The production of correctly spliced messenger RNA requires two catalytic splicing steps. During step II, exon 1 attacks an adenine-guanine (AG) dinucleotide at the 3' splice site. This AG is usually located between 18 and 40 nucleotides downstream from the branch site, and closer AGs are skipped in favour of AGs located more optimally downstream. At present, little is understood about how the correct AG is distinguished from other AGs. Here we describe a metazoan splicing factor (hSlu7) that is required for selection of the correct AG. In the absence of hSlu7, use of the correct AG is suppressed and incorrect AGs are activated. We investigated this loss of fidelity by analysing spliceosomes assembled in the absence of hSlu7. These studies reveal that exon 1 is loosely associated with these spliceosomes. Thus, the improperly held exon cannot access the correct AG, but can attack other AGs indiscriminately. We conclude that hSlu7 is required to hold exon 1 tightly within the spliceosome for attack on a prespecified AG. 相似文献
16.
17.
RNA polymerase heterogeneity in Streptomyces coelicolor 总被引:5,自引:0,他引:5
Two forms of RNA polymerase holoenzyme have been identified in the filamentous differentiating bacterium Streptomyces coelicolor. They contain different species of sigma factor and are distinguishable by their ability to recognize different promoter classes. These and other holoenzyme forms may in part determine the selective expression of different gene sets in this morphologically-complex bacterium. 相似文献
18.
RNA polymerase mutants blocked in sporulation 总被引:29,自引:0,他引:29
19.