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Genetic determinants of genus—Level glycan diversity in a bacterial protein glycosylation system
Autoři: Chris Hadjineophytou aff001; Jan Haug Anonsen aff001; Nelson Wang aff001; Kevin C. Ma aff002; Raimonda Viburiene aff001; Åshild Vik aff001; Odile B. Harrison aff003; Martin C. J. Maiden aff003; Yonatan H. Grad aff002; Michael Koomey aff001
Působiště autorů: Department of Biosciences, Center for Integrative Microbial Evolution, University of Oslo, Oslo, Norway aff001; Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, United States of America aff002; Department of Zoology, University of Oxford, Oxford, United Kingdom aff003; Division of Infectious Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America aff004
Vyšlo v časopise: Genetic determinants of genus—Level glycan diversity in a bacterial protein glycosylation system. PLoS Genet 15(12): e32767. doi:10.1371/journal.pgen.1008532
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1008532Souhrn
The human pathogens N. gonorrhoeae and N. meningitidis display robust intra - and interstrain glycan diversity associated with their O-linked protein glycosylation (pgl) systems. In an effort to better understand the evolution and function of protein glycosylation operating there, we aimed to determine if other human—restricted, Neisseria species similarly glycosylate proteins and if so, to assess the levels of glycoform diversity. Comparative genomics revealed the conservation of a subset of genes minimally required for O-linked protein glycosylation glycan and established those pgl genes as core genome constituents of the genus. In conjunction with mass spectrometric–based glycan phenotyping, we found that extant glycoform repertoires in N. gonorrhoeae, N. meningitidis and the closely related species N. polysaccharea and N. lactamica reflect the functional replacement of a progenitor glycan biosynthetic pathway. This replacement involved loss of pgl gene components of the primordial pathway coincident with the acquisition of two exogenous glycosyltransferase genes. Critical to this discovery was the identification of a ubiquitous but previously unrecognized glycosyltransferase gene (pglP) that has uniquely undergone parallel but independent pseudogenization in N. gonorrhoeae and N. meningitidis. We suggest that the pseudogenization events are driven by processes of compositional epistasis leading to gene decay. Additionally, we documented instances where inter-species recombination influences pgl gene status and creates discordant genetic interactions due ostensibly to the multi-locus nature of pgl gene networks. In summary, these findings provide a novel perspective on the evolution of protein glycosylation systems and identify phylogenetically informative, genetic differences associated with Neisseria species.
Klíčová slova:
Genetic loci – Genomic databases – Glycosylation – Glycosyltransferases – Neisseria – Neisseria meningitidis – Sequence alignment
Zdroje
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