An interdomain RNA binding site on the hepadnaviral polymerase that is essential for reverse transcription

作者：Badtke Matthew P; Khan Irfan; Cao Feng; Hu Jianming; Tavis John E^*

来源：Virology, 2009, 390(1): 130-138.

DOI：10.1016/j.virol.2009.04.023

• Hepatitis B virus
• Hepadnavirus
• Reverse transcription
• Reverse transcriptase
• RNA binding

The T3 motif on the duck hepatitis B virus reverse transcriptase (P) is proposed to be a binding site essential for viral replication, but its ligand and roles in DNA synthesis are unknown. Here, we found that T3 is needed for P to bind the viral RNA, the first step in DNA synthesis. A second motif, RT-1, was predicted to assist T3. T3 and RT-1 appear to form a composite RNA binding site because mutating T3 and RT-1 had similar effects on RNA binding, exposure of antibody epitopes on P, and DNA synthesis. The T3 and RT-1 motifs bound RNA non-specifically, yet they were essential for specific interactions between P and the viral RNA. This implies that specificity for the viral RNA is provided by a post-binding step. The T3:RT-1 motifs are conserved with the human hepatitis B virus and may be an attractive target for novel antiviral drug development.

• 出版日期2009-7-20