Structural Analysis of the Hepatitis B Virus RNA Encapsidation Signal ε by Selective 2'-Hydroxyl Acylation Analyzed...

Area of Science:

• Molecular Biology
• Virology
• Biochemistry

Background:

• RNA structure dictates RNA function, particularly for viral cis-elements like the hepatitis B virus (HBV) RNA encapsidation signal ε.
• The ε element is vital for HBV pgRNA packaging, reverse transcription initiation, and mRNA functions.
• Previous methods confirmed the bipartite stem-loop structure of free ε RNA.

Purpose of the Study:

• To provide a basic protocol for NAI-based SHAPE of isolated HBV ε RNA.
• To investigate the impact of mutations and polymerase binding on ε RNA structural dynamics.
• To facilitate understanding of the conformational dynamics underlying ε element functions.

Main Methods:

• Selective acylation of solvent-accessible 2'-hydroxyls using 2-methylnicotinic acid imidazolide (NAI).
• Mapping of NAI modification sites by primer extension.
• Analysis of resulting cDNAs using denaturing polyacrylamide gel electrophoresis (PAGE).

Main Results:

• Established a protocol for NAI-based SHAPE of HBV ε RNA.
• Gained preliminary insights into how mutations and polymerase binding affect ε RNA structural dynamics.
• Demonstrated the utility of SHAPE for probing RNA structural dynamics.

Conclusions:

• NAI-based SHAPE is a valuable high-resolution technique for studying HBV ε RNA structural dynamics.
• This method can elucidate conformational changes related to viral replication and function.
• SHAPE's applicability in various conditions, including live cells, enhances its utility for studying RNA elements.