期刊
NUCLEIC ACIDS RESEARCH
卷 33, 期 19, 页码 6090-6100出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gki919
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资金
- NCI NIH HHS [T32 CA09031, T32 CA009031] Funding Source: Medline
- NIAID NIH HHS [AI36083-10, R01 AI019838, AI19838, R01 AI036083] Funding Source: Medline
- NATIONAL CANCER INSTITUTE [T32CA009031] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R01AI036083, R01AI019838] Funding Source: NIH RePORTER
Herpes simplex virus-1 US11 is a RNA-binding protein with a novel RNA-binding domain. US11 has been reported to exhibit sequence- and conformation-specific RNA-binding, but the sequences and conformations important for binding are not known. US11 has also been described as a double-stranded RNA (dsRNA)-binding protein. To investigate the US11-RNA interaction, we performed in vitro selection of RNA aptamers that bind US11 from a RNA library consisting of > 10(14) 80 base sequences which differ in a 30 base randomized region. US11 bound specifically to selected aptamers with an affinity of 70 nM. Analysis of 23 selected sequences revealed a strong consensus sequence. The US11 RNA-binding domain and <= 46 bases of selected RNA containing the consensus sequence were each sufficient for binding. US11 binding protected the consensus motif from hydroxyl radical cleavage. RNase digestions of a selected aptamer revealed regions of both single-stranded RNA and dsRNA. We observed that US11 bound two different dsRNAs in a sequence non-specific manner, but with lower affinity than it bound selected aptamers. The results define a relatively short specific sequence that binds US11 with high affinity and indicate that dsRNA alone does not confer high-affinity binding.
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