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- W2125480990 abstract "ABSTRACT Core protein is the major component of the core particle (nucleocapsid) of human hepatitis B virus. Core particles and core proteins are involved in a number of important functions in the replication cycle of the virus, including RNA packaging, DNA synthesis, and recognition of viral envelope proteins. Core protein is a phosphoprotein with most, if not all, of the phosphorylation on C-terminal serine residues. In this study, we identified a serine kinase activity from the ribosome-associated protein fraction of cytoplasm that could specifically bind and phosphorylate the C-terminal portion of recombinant core protein. This kinase is referred to as core-associated kinase (CAK). CAK could be inhibited by the kinase inhibitors heparin and manganese ions but not by spermidine, DRB, H89, or H7, indicating that CAK is distinct from protein kinase A and protein kinase C. CAK could be partially purified by heparin-Sepharose CL-6B and phosphocellulose P11 columns. By using a far-Western assay, three specific proteins, of 46, 35, and 13 kDa, were shown to interact with the C-terminal part of the core protein. These three proteins were present only in the eluted fractions that contains the CAK activity. An in-gel kinase assay showed that a 46-kDa kinase in the same fraction could bind and phosphorylate the C-terminal part of the recombinant core protein. These results indicate that this 46-kDa kinase is most probably CAK. A similar 46-kDa kinase, which exhibits the same profile of sensitivity to kinase inhibitors as that of CAK, is present in both purified intracellular core particles and extracellular 42-nm virions, suggesting that CAK is a candidate for the core particle-associated kinase." @default.
- W2125480990 created "2016-06-24" @default.
- W2125480990 creator A5076225584 @default.
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- W2125480990 date "1998-05-01" @default.
- W2125480990 modified "2023-10-17" @default.
- W2125480990 title "Phosphorylation of the Core Protein of Hepatitis B Virus by a 46-Kilodalton Serine Kinase" @default.
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- W2125480990 doi "https://doi.org/10.1128/jvi.72.5.3796-3803.1998" @default.
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