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Journal of Virology logoLink to Journal of Virology
. 1990 Mar;64(3):1414–1419. doi: 10.1128/jvi.64.3.1414-1419.1990

The N-terminal (pre-S2) domain of a hepatitis B virus surface glycoprotein is translocated across membranes by downstream signal sequences.

B E Eble 1, V R Lingappa 1, D Ganem 1
PMCID: PMC249269  PMID: 2304150

Abstract

The coding region for the hepatitis B virus surface antigens contains three in-phase ATG codons which direct the synthesis of three related polypeptides. The 24-kilodalton major surface (or S) glycoprotein is initiated at the most distal ATG and is a transmembrane protein whose translocation across the bilayer is mediated by at least two uncleaved signal sequences. The product of the next upstream ATG is the 31-kilodalton pre-S2 protein, which contains 55 additional amino acids attached to the N terminus of the S protein. This pre-S2-specific domain is translocated into the endoplasmic reticulum. Using a coupled in vitro translation-translocation system, we showed that (i) the pre-S2 domain itself lacks functional signal sequence activity, (ii) its translocation across the endoplasmic reticulum membrane is mediated by downstream signals within the S domain, and (iii) the N-terminal signal sequence of the S protein can translocate upstream protein domains in the absence of other signals. The hepatitis B virus pre-S2 protein is an example of a natural protein which displays upstream domain translocation, a phenomenon whose existence was originally inferred from the behavior of synthetic fusion proteins in vitro.

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Selected References

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