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-Structure paper
タイトル | Encapsidated hepatitis B virus reverse transcriptase is poised on an ordered RNA lattice. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 111, Issue 31, Page 11329-11334, Year 2014 |
掲載日 | 2014年8月5日 |
著者 | Joseph Che-Yen Wang / David G Nickens / Thomas B Lentz / Daniel D Loeb / Adam Zlotnick / |
PubMed 要旨 | Assembly of a hepatitis B virus (HBV) virion begins with the formation of an RNA-filled core composed of a symmetrical capsid (built of core protein), viral pregenomic RNA, and viral reverse ...Assembly of a hepatitis B virus (HBV) virion begins with the formation of an RNA-filled core composed of a symmetrical capsid (built of core protein), viral pregenomic RNA, and viral reverse transcriptase. To generate the circular dsDNA genome of HBV, reverse transcription requires multiple template switches within the confines of the capsid. To date, most anti-HBV therapeutics target this reverse transcription process. The detailed molecular mechanisms of this crucial process are poorly understood because of the lack of structural information. We hypothesized that capsid, RNA, and viral reverse transcriptase would need a precise geometric organization to accomplish reverse transcription. Here we present the asymmetric structure of authentic RNA-filled cores, determined to 14.5-Å resolution from cryo-EM data. Capsid and RNA are concentric. On the interior of the RNA, we see a distinct donut-like density, assigned to viral reverse transcriptase, which pins the viral pregenomic RNA to the capsid inner surface. The observation of a unique ordered structure inside the core suggests that assembly and the first steps of reverse transcription follow a single, determinate pathway and strongly suggests that all subsequent steps in DNA synthesis do as well. |
リンク | Proc Natl Acad Sci U S A / PubMed:25034253 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 14.5 Å |
構造データ | EMDB-2509: |