alexa N-glycosylation in Archaea: on the coordinated actions of Haloferax volcanii AglF and AglM.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Glycomics & Lipidomics

Author(s): YuristDoutsch S, Magidovich H, Ventura VV, Hitchen PG, Dell A,

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Abstract Like Eukarya and Bacteria, Archaea are also capable of performing N-glycosylation. In the halophilic archaeon Haloferax volcanii, N-glycosylation is mediated by the products of the agl gene cluster. In the present report, this gene cluster was expanded to include an additional sequence, aglM, shown to participate in the biosynthesis of hexuronic acids contained within a pentasaccharide decorating the S-layer glycoprotein, a reporter H. volcanii glycoprotein. In response to different growth conditions, changes in the transcription profile of aglM mirrored changes in the transcription profiles of aglF, aglG and aglI, genes encoding confirmed participants in the H. volcanii N-glycosylation pathway, thus offering support to the hypothesis that in H. volcanii, N-glycosylation serves an adaptive role. Following purification, biochemical analysis revealed AglM to function as a UDP-glucose dehydrogenase. In a scoupled reaction with AglF, a previously identified glucose-1-phosphate uridyltransferase, UDP-glucuronic acid was generated from glucose-1-phosphate and UTP in a NAD(+)-dependent manner. These experiments thus represent the first step towards in vitro reconstitution of the archaeal N-glycosylation process. This article was published in Mol Microbiol and referenced in Journal of Glycomics & Lipidomics

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