+検索条件
-Structure paper
タイトル | A kinase chaperones hepatitis B virus capsid assembly and captures capsid dynamics in vitro. |
---|---|
ジャーナル・号・ページ | PLoS Pathog, Vol. 7, Issue 11, Page e1002388, Year 2011 |
掲載日 | 2011年11月17日 |
著者 | Chao Chen / Joseph Che-Yen Wang / Adam Zlotnick / |
PubMed 要旨 | The C-terminal domain (CTD) of Hepatitis B virus (HBV) core protein is involved in regulating multiple stages of the HBV lifecycle. CTD phosphorylation correlates with pregenomic-RNA encapsidation ...The C-terminal domain (CTD) of Hepatitis B virus (HBV) core protein is involved in regulating multiple stages of the HBV lifecycle. CTD phosphorylation correlates with pregenomic-RNA encapsidation during capsid assembly, reverse transcription, and viral transport, although the mechanisms remain unknown. In vitro, purified HBV core protein (Cp183) binds any RNA and assembles aggressively, independent of phosphorylation, to form empty and RNA-filled capsids. We hypothesize that there must be a chaperone that binds the CTD to prevent self-assembly and nonspecific RNA packaging. Here, we show that HBV capsid assembly is stalled by the Serine Arginine protein kinase (SRPK) binding to the CTD, and reactivated by subsequent phosphorylation. Using the SRPK to probe capsids, solution and structural studies showed that SRPK bound to capsid, though the CTD is sequestered on the capsid interior. This result indicates transient CTD externalization and suggests that capsid dynamics could be crucial for directing HBV intracellular trafficking. Our studies illustrate the stochastic nature of virus capsids and demonstrate the appropriation of a host protein by a virus for a non-canonical function. |
リンク | PLoS Pathog / PubMed:22114561 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 14.2 - 17.4 Å |
構造データ | EMDB-1968: EMDB-1969: |
由来 |
|