Journal
FEBS LETTERS
Volume 594, Issue 3, Pages 439-451Publisher
WILEY
DOI: 10.1002/1873-3468.13618
Keywords
alpha-mannosidase; crystal structure; glycoprotein modification; mannosidase; N-glycan enzymatic modification
Funding
- United State Defense Threat Reduction Agency [HDTRA1-15-1-0054]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- DOE Office of Biological and Environmental Research
- National Institutes of Health, National Institute of General Medical Sciences [P41GM103393]
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While multiple alpha 1-2-mannosidases are necessary for glycoprotein N-glycan maturation in vertebrates, a single bacterial alpha 1-2-mannosidase can be sufficient to cleave all alpha 1-2-linked mannose residues in host glycoprotein N-glycans. We report here the characterization and crystal structure of a new alpha 1-2-mannosidase (EfMan-I) from Enterococcus faecalis, a Gram-positive opportunistic human pathogen. EfMan-I catalyzes the cleavage of alpha 1-2-mannose from not only oligomannoses but also high-mannose-type N-glycans on glycoproteins. Its 2.15 angstrom 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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