Intracellular catalysis of disulfide bond formation by the human sulfhydryl oxidase, QSOX1

Jessop, C.E., Chakravarthi, S., Willer, M., Stirling, C.J. and Bulleid, N.J. (2007) Intracellular catalysis of disulfide bond formation by the human sulfhydryl oxidase, QSOX1. Biochemical Journal, 404(3), pp. 403-411. (doi:10.1042/BJ20061510)

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Abstract

The discovery that the flavoprotein oxidase, Erv2p, provides oxidizing potential for disulfide bond formation in yeast, has led to investigations into the roles of the mammalian homologues of this protein. Mammalian homologues of Erv2p include QSOX (sulfhydryl oxidases) from human lung fibroblasts, guinea-pig endometrial cells and rat seminal vesicles. In the present study we show that, when expressed in mammalian cells, the longer version of human QSOX1 protein (hQSOX1a) is a transmembrane protein localized primarily to the Golgi apparatus. We also present the first evidence showing that hQSOX1a can act in vivo as an oxidase. Overexpression of hQSOX1a suppresses the lethality of a complete deletion of ERO1 (endoplasmic reticulum oxidase 1) in yeast and restores disulfide bond formation, as assayed by the folding of the secretory protein carboxypeptidase Y.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bulleid, Professor Neil
Authors: Jessop, C.E., Chakravarthi, S., Willer, M., Stirling, C.J., and Bulleid, N.J.
Subjects:Q Science > QH Natural history > QH345 Biochemistry
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Biochemical Journal
ISSN:0264-6021
Published Online:01 March 2007
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