Abstract:
:The N-glycan-dependent quality control of glycoprotein folding prevents endoplasmic to Golgi exit of folding intermediates, irreparably misfolded glycoproteins and incompletely assembled multimeric complexes. It also enhances folding efficiency by preventing aggregation and facilitating formation of proper disulfide bonds. The control mechanism essentially involves four components, resident lectin-chaperones that recognize monoglucosylated polymannose glycans, a lectin-associated oxidoreductase acting on monoglucosylated glycoproteins, a glucosyltransferase that creates monoglucosytlated epitopes in protein-linked glycans and a glucosidase that removes the glucose units added by the glucosyltransferase. This last enzyme is the only mechanism component sensing glycoprotein conformations as it creates monoglucosylated glycans exclusively in not properly folded species or in not completely assembled complexes. The glucosidase is a dimeric heterodimer composed of a catalytic subunit and an additional one that is partially responsible for the ER localization of the enzyme and for the enhancement of the deglucosylation rate as its mannose 6-phosphate receptor homologous domain presents the substrate to the catalytic site. This review deals with our present knowledge on the glucosyltransferase and the glucosidase.
journal_name
Semin Cell Dev Bioljournal_title
Seminars in cell & developmental biologyauthors
D'Alessio C,Caramelo JJ,Parodi AJdoi
10.1016/j.semcdb.2009.12.014subject
Has Abstractpub_date
2010-07-01 00:00:00pages
491-9issue
5eissn
1084-9521issn
1096-3634pii
S1084-9521(09)00259-6journal_volume
21pub_type
杂志文章,评审abstract::Given the large socio-economic burden of cancer, there is an urgent need for in vivo animal cancer models that can provide a rationale for personalised therapeutic regimens that are translatable to the clinic. Recent developments in establishing mouse models that closely resemble human lung cancers involve the applica...
journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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journal_title:Seminars in cell & developmental biology
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