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. 1987 Jul;7(7):2491–2497. doi: 10.1128/mcb.7.7.2491

Location of sequences within rotavirus SA11 glycoprotein VP7 which direct it to the endoplasmic reticulum.

P L Whitfeld, C Tyndall, S C Stirzaker, A R Bellamy, G W Both
PMCID: PMC365382  PMID: 3039347

Abstract

The Simian 11 rotavirus glycoprotein VP7 is directed to the endoplasmic reticulum (ER) of the cell and retained as an integral membrane protein. The gene coding for VP7 predicts two potential initiation codons, each of which precedes a hydrophobic region of amino acids (H1 and H2) with the characteristics of a signal peptide. Using the techniques of gene mutagenesis and expression, we have determined that either hydrophobic domain alone can direct VP7 to the ER. A protein lacking both hydrophobic regions was not transported to the ER. Some polypeptides were directed across the ER membrane and then into the secretory pathway of the cell. For a variant retaining only the H1 domain, secretion was cleavage dependent, since an amino acid change which prevented cleavage also stopped secretion. However, secretion of two other deletion mutants lacking H1 and expressing truncated H2 domains was unaffected by this mutation, suggesting that these proteins were secreted without cleavage of their NH2-terminal hydrophobic regions or secreted after cleavage at a site(s) not predicted by current knowledge.

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Selected References

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