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• W2897516664 abstract "ABSTRACT The genus Neisseria includes three major species of importance to human health and disease ( Neisseria gonorrhoeae , Neisseria meningitidis , and Neisseria lactamica ) that express broad-spectrum O -linked protein glycosylation (Pgl) systems. The potential for related Pgl systems in other species in the genus, however, remains to be determined. Using a strain of Neisseria elongata subsp. glycolytica , a unique tetrasaccharide glycoform consisting of di- N -acetylbacillosamine and glucose as the first two sugars followed by a rare sugar whose mass spectrometric fragmentation profile was most consistent with di- N -acetyl hexuronic acid and a N -acetylhexosamine at the nonreducing end has been identified. Based on established mechanisms for UDP-di- N -acetyl hexuronic acid biosynthesis found in other microbes, we searched for genes encoding related pathway components in the N. elongata subsp. glycolytica genome. Here, we detail the identification of such genes and the ensuing glycosylation phenotypes engendered by their inactivation. While the findings extend the conservative nature of microbial UDP-di- N -acetyl hexuronic acid biosynthesis, mutant glycosylation phenotypes reveal unique, relaxed specificities of the glycosyltransferases and oligosaccharyltransferases to incorporate pathway intermediate UDP-sugars into mature glycoforms. IMPORTANCE Broad-spectrum protein glycosylation (Pgl) systems are well recognized in bacteria and archaea. Knowledge of how these systems relate structurally, biochemically, and evolutionarily to one another and to others associated with microbial surface glycoconjugate expression is still incomplete. Here, we detail reverse genetic efforts toward characterization of protein glycosylation mutants of N. elongata subsp. glycolytica that define the biosynthesis of a conserved but relatively rare UDP-sugar precursor. The results show both a significant degree of intra- and transkingdom conservation in the utilization of UDP-di- N -acetyl-glucuronic acid and singular properties related to the relaxed specificities of the N. elongata subsp. glycolytica system" @default.
• W2897516664 created "2018-10-26" @default.
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• W2897516664 date "2019-01-01" @default.
• W2897516664 modified "2023-10-17" @default.
• W2897516664 title "Disrupted Synthesis of a Di- <i>N</i> -acetylated Sugar Perturbs Mature Glycoform Structure and Microheterogeneity in the <i>O</i> -Linked Protein Glycosylation System of Neisseria elongata subsp. <i>glycolytica</i>" @default.
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• W2897516664 doi "https://doi.org/10.1128/jb.00522-18" @default.
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