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A single tryptophan residue of endomannosidase is crucial for Golgi localization and in vivo activity


Torossi, T; Roth, J; Ziak, M (2007). A single tryptophan residue of endomannosidase is crucial for Golgi localization and in vivo activity. Cellular and Molecular Life Sciences, 64(14):1881-1889.

Abstract

Abstract.: Golgi-endomannosidase provides an alternate glucosidase-independent pathway of glucose trimming. Activity for endomannosidase is detectable in various tissues and cell lines but not in CHO cells. Cloning of CHO cell endomannosidase revealed that the highly conserved Trp188 and Arg177 of vertebrate endomannosidase were both substituted by Cys. The Trp188Cys substitution was functionally important since it alone resulted in endoplasmic reticulum (ER) mislocalization of endomannosidase and caused the greatly reduced in vivo activity. These effects could be reversed in cells with a back-engineered Cys188Trp CHO cell endomannosidase, in particular N-glycans of α1-antitrypsin became fully processed. The intramolecular disulfide bridge of CHO cell endomannosidase formed with the additional Cys188 was not solely responsible for the reduced enzyme activity since endomannosidase with engineered Cys188Ala or Ser substitutions did not restore enzyme activity and was ER mislocalized. Thus, the conserved Trp188 residue in endomannosidases is of critical importance for correct subcellular localization and in vivo activity of the enzyme

Abstract

Abstract.: Golgi-endomannosidase provides an alternate glucosidase-independent pathway of glucose trimming. Activity for endomannosidase is detectable in various tissues and cell lines but not in CHO cells. Cloning of CHO cell endomannosidase revealed that the highly conserved Trp188 and Arg177 of vertebrate endomannosidase were both substituted by Cys. The Trp188Cys substitution was functionally important since it alone resulted in endoplasmic reticulum (ER) mislocalization of endomannosidase and caused the greatly reduced in vivo activity. These effects could be reversed in cells with a back-engineered Cys188Trp CHO cell endomannosidase, in particular N-glycans of α1-antitrypsin became fully processed. The intramolecular disulfide bridge of CHO cell endomannosidase formed with the additional Cys188 was not solely responsible for the reduced enzyme activity since endomannosidase with engineered Cys188Ala or Ser substitutions did not restore enzyme activity and was ER mislocalized. Thus, the conserved Trp188 residue in endomannosidases is of critical importance for correct subcellular localization and in vivo activity of the enzyme

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:570 Life sciences; biology
Scopus Subject Areas:Life Sciences > Molecular Medicine
Life Sciences > Molecular Biology
Life Sciences > Pharmacology
Life Sciences > Cellular and Molecular Neuroscience
Life Sciences > Cell Biology
Language:English
Date:1 July 2007
Deposited On:03 Jul 2019 13:39
Last Modified:15 Apr 2021 14:54
Publisher:Springer
ISSN:1420-682X
OA Status:Green
Publisher DOI:https://doi.org/10.1007/s00018-007-7224-6
PubMed ID:17593322

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