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Involvement of a cysteine protease in the secretion process of human xylosyltransferase I

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Abstract

Xylosylation of core proteins takes place in the Golgi-apparatus as the transfer of xylose from UDP-xylose to specific serine residues in proteoglycan core proteins. This initial and rate-limiting step in glycosaminoglycan biosynthesis is catalyzed by human xylosyltransferase I (XT-I). XT-I is proteolytically cleaved from the Golgi surface and shed in its active form into the extracellular space. The secreted, circulating glycosyltransferase represents a serum biomarker for various diseases with an altered proteoglycan metabolism, whereas a physiological function of secreted XT-I is still unknown. To shed light on the secretion process of XT-I and on its biological function, the cleavage site was examined and the group of proteases involved in the cleavage was identified in this study. The peptide mass fingerprint from partly purified secreted XT-I revealed the cleavage site to be localized in the aminoterminal 231 amino acids. The addition of a cysteine protease inhibitor cocktail to cells recombinantly expressing XT-I led to a concentration-dependent shift of enzyme activity towards the cell lysates attended by consistent total intracellular and extracellular XT-I activities. In conclusion, our findings provide a first insight into the XT-I secretion process regulated by a cysteine protease and may contribute to understanding the biological and pathological role of this process.

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Abbreviations

AAA:

Abdominal aortic aneurysm

CRTL:

Control

EC:

Extracellular

IC:

Intracellular

XT:

Xylosyltransferase

XT-I:

Xylosyltransferase I

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Acknowledgements

The authors thank Xiaoping Xu and Gudrun Bokermann for their excellent technical assistance. In addition, we thank Sarah L. Kirkby for her linguistic advice.

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Authors and Affiliations

  1. Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinik der Ruhr-Universität Bochum, Georgstraße 11, 32545, Bad Oeynhausen, Germany

    Claudia Pönighaus, Joachim Kuhn, Knut Kleesiek & Christian Götting

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  1. Claudia Pönighaus
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  2. Joachim Kuhn
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  3. Knut Kleesiek
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  4. Christian Götting
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Correspondence to Christian Götting.

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Pönighaus, C., Kuhn, J., Kleesiek, K. et al. Involvement of a cysteine protease in the secretion process of human xylosyltransferase I. Glycoconj J 27, 359–366 (2010). https://doi.org/10.1007/s10719-010-9283-4

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  • DOI: https://doi.org/10.1007/s10719-010-9283-4

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