Download MendeleySolution structure and RNA-binding activity of the N-terminal leucine-repeat region of hepatitis delta antigen
Lin, I.J., Lou, Y.C., Pai, M.T., Wu, H.N., Cheng, J.W.(1999) Proteins 37: 121-129
- PubMed: 10451556
- DOI: https://doi.org/10.1002/(sici)1097-0134(19991001)37:1<121::aid-prot12>3.0.co;2-t
- Primary Citation of Related Structures:
1BY0 - PubMed Abstract:
Hepatitis delta virus (HDV) is a satellite virus of the hepatitis B virus (HBV) which provides the surface antigen for the viral coat. The RNA genome of HDV encodes two proteins: the small delta antigen and the large delta antigen. The two proteins resemble each other except for the presence of an additional 19 amino acids at the C terminus of the latter species. We have found that the N-terminal leucine-repeat region of hepatitis delta antigen (HDAg) binds to the autolytic domain of HDV genomic RNA and attenuates its autolytic activity. A 27-residue polypeptide corresponding to residues 24-50 of HDAg, designated dAg(24-50), was synthesized, and its solution structure was found to be an alpha-helix by circular dichroism and (1)H-nuclear magnetic resonance (NMR) techniques. Binding affinity of dAg(24-50) with HDV genomic RNA was found to increase with its alpha-helical content, and it was further confirmed by modifying its N- and C-terminal groups. Furthermore, the absence of RNA binding activity in the mutant peptides, dAgM(24-50am) and dAgM(Ac24-50am), in which Lys38, Lys39, and Lys40 were changed to Glu, indicates a possible involvement of these residues in their binding activity. Structural knowledge of the N-terminal leucine-repeat region of HDAg thus provides a molecular basis for the understanding of its role in the interaction with RNA. Proteins 1999;37:121-129.
Organizational Affiliation:
Department of Life Science, National Tsing Hua University, Hsinchu, Taiwan, ROC.
