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Enterococcus faecalis α1-2-mannosidase (EfMan-I): an efficient catalyst for glycoprotein N-glycan modification.

  • Author(s): Li, Yanhong;
  • Li, Riyao;
  • Yu, Hai;
  • Sheng, Xue;
  • Wang, Jing;
  • Fisher, Andrew J;
  • Chen, Xi
  • et al.
Abstract

While multiple α 1-2-mannosidases are necessary for glycoprotein N-glycan maturation in vertebrates, a single bacterial α1-2-mannosidase can be sufficient to cleave all α1-2-linked mannose residues in host glycoprotein N-glycans. We report here the characterization and crystal structure of a new α1-2-mannosidase (EfMan-I) from Enterococcus faecalis, a Gram-positive opportunistic human pathogen. EfMan-I catalyzes the cleavage of α1-2-mannose from not only oligomannoses but also high-mannose-type N-glycans on glycoproteins. Its 2.15 Å resolution crystal structure reveals a two-domain enzyme fold similar to other CAZy GH92 mannosidases. An unexpected potassium ion was observed bridging two domains near the active site. These findings support EfMan-I as an effective catalyst for in vitro N-glycan modification of glycoproteins with high-mannose-type N-glycans.

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