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7LR8

Crystal structure of GH5_18-E153A from Streptomyces cattleya in complex with Manb1-4GlcNAc

Summary for 7LR8
Entry DOI10.2210/pdb7lr8/pdb
DescriptorUncharacterized protein ScGH5_18, beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-(2-ETHOXYETHOXY)ETHANOL, ... (6 entities in total)
Functional Keywordsglycosidase, n-glycan, cazyme, hydrolase
Biological sourceStreptomyces cattleya (strain ATCC 35852 / DSM 46488 / JCM 4925 / NBRC 14057 / NRRL 8057)
Total number of polymer chains2
Total formula weight97236.17
Authors
Higgins, M.A.,Ryan, K.S. (deposition date: 2021-02-16, release date: 2021-04-07, Last modification date: 2023-10-18)
Primary citationHiggins, M.A.,Tegl, G.,MacDonald, S.S.,Arnal, G.,Brumer, H.,Withers, S.G.,Ryan, K.S.
N-Glycan Degradation Pathways in Gut- and Soil-Dwelling Actinobacteria Share Common Core Genes.
Acs Chem.Biol., 16:701-711, 2021
Cited by
PubMed Abstract: N-Glycosylation is a fundamental protein modification found in both eukaryotes and archaea. Despite lacking N-glycans, many commensal and pathogenic bacteria have developed mechanisms to degrade these isoforms for a variety of functions, including nutrient acquisition and evasion of the immune system. Although much is known about many of the enzymes responsible for N-glycan degradation, the enzymes involved in cleaving the N-glycan core have only recently been discovered. Thus, some of the structural details have yet to be characterized, and little is known about their full distribution among bacterial strains and specifically within potential Gram-positive polysaccharide utilization loci. Here, we report crystal structures for Family 5, Subfamily 18 (GH5_18) glycoside hydrolases from the gut bacterium (BlGH5_18) and the soil bacterium (ScGH5_18), which hydrolyze the core Manβ1-4GlcNAc disaccharide. Structures of these enzymes in complex with Manβ1-4GlcNAc reveal a more complete picture of the -1 subsite. They also show that a C-terminal active site cap present in BlGH5_18 is absent in ScGH5_18. Although this C-terminal cap is not widely distributed throughout the GH5_18 family, it is important for full enzyme activity. In addition, we show that GH5_18 enzymes are found in Gram-positive polysaccharide utilization loci that share common genes, likely dedicated to importing and degrading N-glycan core structures.
PubMed: 33764747
DOI: 10.1021/acschembio.0c00995
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (1.6 Å)
Structure validation

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