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TitleA kinase chaperones hepatitis B virus capsid assembly and captures capsid dynamics in vitro.
Journal, issue, pagesPLoS Pathog, Vol. 7, Issue 11, Page e1002388, Year 2011
Publish dateNov 17, 2011
AuthorsChao Chen / Joseph Che-Yen Wang / Adam Zlotnick /
PubMed AbstractThe 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.
External linksPLoS Pathog / PubMed:22114561 / PubMed Central
MethodsEM (single particle)
Resolution14.2 - 17.4 Å
Structure data

EMDB-1968:
The cryo-EM structure of HBV Cp183 capsid-SRPK complex
Method: EM (single particle) / Resolution: 14.2 Å

EMDB-1969:
The cryo-EM structure of HBV Cp183 capsid
Method: EM (single particle) / Resolution: 17.4 Å

Source
  • Homo sapiens (human)

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