7LR8 image
Entry Detail
PDB ID:
7LR8
Keywords:
Title:
Crystal structure of GH5_18-E153A from Streptomyces cattleya in complex with Manb1-4GlcNAc
Biological Source:
PDB Version:
Deposition Date:
2021-02-16
Release Date:
2021-04-07
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Uncharacterized protein ScGH5_18
Mutations:E153A
Chain IDs:A, B
Chain Length:433
Number of Molecules:2
Biological Source:Streptomyces cattleya (strain ATCC 35852 / DSM 46488 / JCM 4925 / NBRC 14057 / NRRL 8057)
Primary Citation
N-Glycan Degradation Pathways in Gut- and Soil-Dwelling Actinobacteria Share Common Core Genes.
Acs Chem.Biol. 16 701 711 (2021)
PMID: 33764747 DOI: 10.1021/acschembio.0c00995

Abstact

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 Bifidobacterium longum (BlGH5_18) and the soil bacterium Streptomyces cattleya (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.

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