Structural studies on the RNA-recognition motif of NELF E, a cellular negative transcription elongation factor involved in the regulation of HIV transcription.Rao, J.N., Neumann, L., Wenzel, S., Schweimer, K., Rosch, P., Wohrl, B.M.
(2006) Biochem. J. 400: 449-456
- PubMed: 16898873
- DOI: 10.1042/BJ20060421
- PubMed Abstract:
The elongation of transcription of HIV RNA at the TAR (transactivation-response element) is highly regulated by positive and negative factors. The cellular negative transcription elongation factor NELF (negative elongation factor) was suggested to be ...
The elongation of transcription of HIV RNA at the TAR (transactivation-response element) is highly regulated by positive and negative factors. The cellular negative transcription elongation factor NELF (negative elongation factor) was suggested to be involved in transcriptional regulation of HIV-1 (HIV type 1) by binding to the stem of the viral TAR RNA which is synthesized by cellular RNA polymerase II at the viral long terminal repeat. NELF is a heterotetrameric protein consisting of NELF A, B, C or the splice variant D, and E. In the present study, we determined the solution structure of the RRM (RNA-recognition motif) of the RNA-binding subunit NELF E and studied its interaction with the viral TAR RNA. Our results show that the separately expressed recombinant NELF E RRM has alpha-helical and beta-strand elements adopting a betaalphabetabetaalphabeta fold and is able to bind to TAR RNA. Fluorescence equilibrium titrations with fluorescently labelled double- and single-stranded oligoribonucleotides representing the TAR RNA stem imply that NELF E RRM binds to the single-stranded TAR RNAs with K(d) values in the low-micromolar range.
Universität Bayreuth, Lehrstuhl Biopolymere, Universitätsstrasse 30, D-95447 Bayreuth, Germany.