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Retinol‐induced secretion of human retinol‐binding protein in yeast
Author(s) -
Reppe Sjur,
Smeland Sigbjørn,
Moskaug Jan Ø,
Blomhoff Rune
Publication year - 1998
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(98)00428-1
Subject(s) - retinol , secretion , retinol binding protein , yeast , biochemistry , endoplasmic reticulum , saccharomyces cerevisiae , biology , vitamin , chemistry
Retinol‐binding protein (RBP) functions as a transporter for retinol (vitamin A) in plasma in higher eukaryotes. We have successfully expressed human RBP in Saccharomyces cerevisiae , and its secretion was found to be induced by retinol also in this lower eukaryote. Reduced induction of secretion by retinol in a temperature‐sensitive sec18‐1 mutant that is blocked in secretion at the restricted temperature suggests that as in mammalian cells, RBP can be released from the endoplasmic reticulum upon addition of retinol. Thus, the molecular mechanism involved in retinol‐dependent secretion of RBP appears to be conserved in yeast, and this points to yeast as a putative model system for studying retinol‐regulated secretion of RBP. RBP purified from yeast was found to be indistinguishable from RBP purified from human plasma in several functional assays.