1887

Abstract

Previous studies have shown that the progression of hepatitis B virus-related liver disease in long-term immunosuppressed kidney transplant recipients is associated with the accumulation of virus variants carrying in-frame deletions in the central part of the core gene. A set of naturally occurring core protein variants was expressed in Escherichia coli in order to investigate their stability and assembly competence and to characterize their antigenic and immunogenic properties. In addition, a library of core gene variants generated in vitro with deletions including the major immunodominant region (MIR) of the core protein was investigated. The position and length of deletions determined the behaviour of mutant core proteins in E. coli and their assignment to one of the three groups: (i) assembly-competent, (ii) stable but assembly-incompetent and (iii) unstable proteins. In vivo core variants with MIR deletions between amino acids 77 and 93 belong to the first group. Only proteins with the shortest deletion (amino acids 86-93) showed stability and self-assembly at the same level as wild-type cores, and they showed reduced antigenicity and immunogenicity. Mutants with deletions extending N-terminally beyond residue G73 or C-terminally beyond G94 were found to be assembly-incompetent. We suggest that G73 and G94 are involved in the folding and the native assembly of core molecules, whereas the intervening sequence determines the antibody response. Depending on their ability to form stable proteins or to assemble into particles, core mutants could contribute to liver cell pathogenesis in different ways.

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1999-07-01
2023-02-01
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