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© Yang SI, Institut Pasteur
Publication : FEBS letters

The chromosomal protein HMG-D binds to the TAR and RBE RNA of HIV-1

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in FEBS letters - 17 Nov 2000

Arimondo PB, Gelus N, Hamy F, Payet D, Travers A, Bailly C

Link to Pubmed [PMID] – 11086163

FEBS Lett. 2000 Nov;485(1):47-52

The high mobility group protein HMG-D is known to bind preferentially to DNA of irregular structures with little or no sequence specificity. Upon binding to DNA, this HMG-box protein widens the minor groove of the double helix and induces a significant bending of the helix. We show here that HMG-D can strongly bind to double-stranded RNA. Electrophoretic mobility shift assays show that HMG-D100 interacts with the transactivation response region (TAR) RNA from HIV-1. Strong interaction with a high affinity Rev protein binding element (RBE) RNA was also characterized. Gel shift experiments performed with several TAR RNA constructs lacking the lateral pyrimidine bulge or with modified apical loop regions indicate that the protein does not recognize the single-strand domains of the RNA but apparently interacts directly with the double-stranded stem regions. No protein-RNA complexes could be detected when using single-stranded oligoribonucleotides. HMG-D protein could bind to the wide minor groove of the A-form TAR RNA. The comparison of the amino acid sequence of HMG-D with that of known RNA binding proteins suggests that the interaction of the protein with a double-stranded RNA implicates the basic region of HMG-D as well as its HMG-box domain. From the in vitro data reported here, we propose a novel functional role for proteins of the HMG-1 family. The results suggest that architectural HMG proteins can be recruited by double-stranded RNA for the development of HIV-1 in the host cell.

https://www.ncbi.nlm.nih.gov/pubmed/11086163