Endo-beta-N-acetylglucosaminidase D [Carbohydrate transport and metabolism].

Glycosyl hydrolase family 85. Family of endo-beta-N-acetylglucosaminidases. These enzymes work on a broad spectrum of substrates.

Endo-beta-N-acetylglucosaminidase (ENGase) hydrolyzes the N-N'-diacetylchitobiosyl core of N-glycosylproteins. The beta-1,4-glycosyl bond located between two N-acetylglucosamine residues is hydrolyzed such that N-acetylglucosamine 1 remains with the protein and N-acetylglucosamine 2 forms the reducing end of the released glycan. ENGase is a key enzyme in the processing of free oligosaccharides in the cytosol of eukaryotes. Oligosaccharides formed in the lumen of the endoplasmic reticulum are transported into the cytosol where they are catabolized by cytosolic ENGases and other enzymes, possibly to maximize the reutilization of the component sugars. ENGases have an eight-stranded alpha/beta barrel topology and are classified as a family 85 glycosyl hydrolase (GH85) domain. The GH85 ENGases are sequence-similar to the family 18 glycosyl hydrolases, also known as GH18 chitinases. An ENGase-like protein is also found in bacteria and is included in this alignment model.

F5/8 type C domain. This domain is also known as the discoidin (DS) domain family.

leucine-rich repeats. A leucine-rich repeat (LRR) is a structural protein motif of 20-30 amino acids that is unusually rich in the hydrophobic amino acid leucine. The conserved eleven-residue sequence motif (LxxLxLxxN/CxL) within the LRRs corresponds to the beta-strand and adjacent loop regions, whereas the remaining parts of the repeats are variable. LRRs fold together to form a solenoid protein domain, termed leucine-rich repeat domain. Leucine-rich repeats are usually involved in protein-protein interactions.

Structureof a Streptococcus pneumoniae family 85 glycoside hydrolase, Endo-D. [Streptococcus pneumoniae TIGR4],2W92_A Structure of a Streptococcus pneumoniae family 85 glycoside hydrolase, Endo-D, in complex with NAG-thiazoline. [Streptococcus pneumoniae TIGR4]

Crystalstructure of Spr0440 glycoside hydrolase domain, Endo-D from Streptococcus pneumoniae R6 [Streptococcus pneumoniae R6]

X-raycrystal structure of the Endo-beta-N-acetylglucosaminidase from Arthrobacter protophormiae E173Q mutant reveals a TIM barrel catalytic domain and two ancillary domains [Glutamicibacter protophormiae],2VTF_B X-ray crystal structure of the Endo-beta-N-acetylglucosaminidase from Arthrobacter protophormiae E173Q mutant reveals a TIM barrel catalytic domain and two ancillary domains [Glutamicibacter protophormiae]

ChainA, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae],3FHA_B Chain B, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae],3FHA_C Chain C, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae],3FHA_D Chain D, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae]

ChainA, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae],3FHQ_B Chain B, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae],3FHQ_D Chain D, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae],3FHQ_F Chain F, Endo-beta-N-acetylglucosaminidase [Glutamicibacter protophormiae]