Heterogeneous nuclear ribonucleoprotein C binds exclusively to the functionally important UUUUU-motifs in the human papillomavirus type-1 AU-rich inhibitory element

Citation
M. Sokolowski et S. Schwartz, Heterogeneous nuclear ribonucleoprotein C binds exclusively to the functionally important UUUUU-motifs in the human papillomavirus type-1 AU-rich inhibitory element, VIRUS RES, 73(2), 2001, pp. 163-175
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Microbiology
Journal title
VIRUS RESEARCH
ISSN journal
0168-1702 → ACNP
Volume
73
Issue
2
Year of publication
2001
Pages
163 - 175
Database
ISI
SICI code
0168-1702(200103)73:2<163:HNRCBE>2.0.ZU;2-F
Abstract
We have previously identified an inhibitory, 57 nt AU-rich sequence in the HPV-I late 3' UTR, termed as the HPV-I AU-rich element (h1ARE). It contains two types of functionally important motifs: two AUUUA sequences and three UUUUU sequences. We have shown that the h1ARE interacts with heterogeneous nuclear ribonucleoprotein (hnRNP) C1/C2 and the ELAV-like HuR protein. Whil e we have shown that HuR binds to both the AUUUA- and the UUUUU-motifs. the interaction between hnRNP C and the h1ARE has not been investigated in det ail. Here, we have used recombinant (r)hnRNP C1 to study the interaction be tween hnRNP C1 and the h1ARE by using the UV cross-linking assay. We demons trate that (r)hnRNP C1 cross-links specifically to the three functionally i mportant UUUUU-motifs in the h1ARE. In contrast. (r)hnRNP does not UV cross -link to the functionally important AUUUA-motifs in the h1ARE. Conclusively , the binding ability of hnRNP C to the h1ARE correlates with its partially inhibitory function. Additionally, the recombinant AU-rich RNA binding fac tor 1 (AUF1) was analyzed for binding to the h1ARE by using the UV cross-li nking assay, but the results revealed no specificity for the functionally i mportant AUUUA- and UUUUU-motifs. (C) 2001 Elsevier Science B.V. All rights reserved.