Identification of tri-phosphatase activity in the biogenesis of retroviral microRNAs and RNAP III-generated shRNAs.
Identification of tri-phosphatase activity in the biogenesis of retroviral microRNAs and RNAP III-generated shRNAs.
复制标题
DOI:
10.1093/nar/gku1247
复制
发表时间:
2014-12-16
影响因子:
14.9
通讯作者:
Sullivan CS
中科院分区:
文献类型:
--
作者:
Burke JM;Bass CR;Kincaid RP;Sullivan CS
Transcripts possessing a 5′-triphosphate are a hallmark of viral transcription and can trigger the host antiviral response. 5′-triphosphates are also found on common host transcripts transcribed by RNA polymerase III (RNAP III), yet how these transcripts remain non-immunostimulatory is incompletely understood. Most microRNAs (miRNAs) are 5′-monophosphorylated as a result of sequential endonucleolytic processing by Drosha and Dicer from longer RNA polymerase II (RNAP II)-transcribed primary transcripts. In contrast, bovine leukemia virus (BLV) expresses subgenomic RNAP III transcripts that give rise to miRNAs independent of Drosha processing. Here, we demonstrate that each BLV pre-miRNA is directly transcribed by RNAP III from individual, compact RNAP III type II genes. Thus, similar to manmade RNAP III-generated short hairpin RNAs (shRNAs), the BLV pre-miRNAs are initially 5′-triphosphorylated. Nonetheless, the derivative 5p miRNAs and shRNA-generated 5p small RNAs (sRNAs) possess a 5′-monophosphate. Our enzymatic characterization and small RNA sequencing data demonstrate that BLV 5p miRNAs are co-terminal with 5′-triphosphorylated miRNA precursors (pre-miRNAs). Thus, these results identify a 5′-tri-phosphatase activity that is involved in the biogenesis of BLV miRNAs and shRNA-generated sRNAs. This work advances our understanding of retroviral miRNA and shRNA biogenesis and may have implications regarding the immunostimulatory capacity of RNAP III transcripts.
登录
查看更多内容
DOI:
10.1084/jem.20090831
发表时间:
2010-03-15
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
Han YC;Park CY;Bhagat G;Zhang J;Wang Y;Fan JB;Liu M;Zou Y;Weissman IL;Gu H
通讯作者:
Gu H
影响因子:
16
作者:
Bogerd HP;Karnowski HW;Cai X;Shin J;Pohlers M;Cullen BR
通讯作者:
Cullen BR
影响因子:
6.7
作者:
Kincaid RP;Sullivan CS
通讯作者:
Sullivan CS
影响因子:
5.4
作者:
Chen, Chun Jung;Kincaid, Rodney P.;Sullivan, Christopher S.
通讯作者:
Sullivan, Christopher S.
影响因子:
10.5
作者:
Ketting, RF;Fischer, SEJ;Plasterk, RHA
通讯作者:
Plasterk, RHA