7LR2
Crystal structure of GH5_18 from Bifidobacterium longum subsp. longum ATCC 55813 in complex with GlcNAc
Summary for 7LR2
| Entry DOI | 10.2210/pdb7lr2/pdb |
| Descriptor | Glycosyl hydrolase BlGH5_18, 1,2-ETHANEDIOL, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (5 entities in total) |
| Functional Keywords | glycosidase, n-glycan, cazyme, hydrolase |
| Biological source | Bifidobacterium longum subsp. longum ATCC 55813 |
| Total number of polymer chains | 4 |
| Total formula weight | 201637.80 |
| Authors | Higgins, M.A.,Ryan, K.S. (deposition date: 2021-02-15, release date: 2021-04-07, Last modification date: 2023-10-18) |
| Primary citation | Higgins, 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: 33764747DOI: 10.1021/acschembio.0c00995 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.4 Å) |
Structure validation
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