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. 1986 May;6(5):1454–1463. doi: 10.1128/mcb.6.5.1454

Hepatitis B surface antigen: an unusual secreted protein initially synthesized as a transmembrane polypeptide.

B E Eble, V R Lingappa, D Ganem
PMCID: PMC367670  PMID: 3023891

Abstract

Hepatitis B surface antigen (HBsAg), the major coat protein of hepatitis B virus, is also secreted from cells as a subviral particle, without concomitant cleavage of N-terminal amino acid sequences. We examined this unusual export process in a cell-free system and showed that the initial product of HBsAg biosynthesis is an integral transmembrane protein, with most or all of its C-terminal half on the lumenal side of the endoplasmic reticulum membrane. To study the nature of its topogenic signals, we synthesized fusion proteins between HBsAg and the nonsecreted protein alpha-globin. Fusion proteins in which approximately 100 amino acids of globin preceded all HBsAg sequences were successfully translocated in vitro; the same domain as in the wild-type HBsAg was transported into the vesicle lumen. Fusions in which the entire globin domain was C terminal were able to translocate both the C-terminal region of HBsAg and its attached globin domain. Thus, uncleaved signal sequences in p24s function to direct portions of the molecule across the membrane and are able to perform this function even when positioned in an internal protein domain.

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