Galactose mutarotase-like fold domain. This domain is found in endo-alpha-N-acetylgalactosaminidase present in Streptococcus pneumoniae. Endo-alpha-N-acetylgalactosaminidase is a cell surface-anchored glycoside hydrolase involved in the breakdown of mucin type O-linked glycans. The domain, known as domain 2, exhibits strong structural similarlity to the galactose mutarotase-like fold but lacks the active site residues. Domains, found in a number of glycoside hydrolases, structurally similar to domain 2 confer stability to the multidomain architectures.

Endo-a-N-acetylgalactosaminidase and related glcyosyl hydrolases. This family contains the enzymatically active domain of cell surface proteins that specifically cleave Gal-beta-1,3-GalNAc-alpha-Ser/Thr (T-antigen, galacto-N-biose), the core 1 type O-linked glycan common to mucin glycoproteins (EC:3.2.1.97). It has been classified as glycosyl hydrolase family 101 in the Cazy resource. Virulence of pathogenic organisms such as the Gram-positive Streptococcus pneumoniae and other commensal human bacteria is largely determined by their ability to degrade host glycoproteins and to metabolize the resultant carbohydrates.

Endo-alpha-N-acetylgalactosaminidase. Virulence of pathogenic organisms such as the Gram-positive Streptococcus pneumoniae is largely determined by the ability to degrade host glycoproteins and to metabolize the resultant carbohydrates. This family is the enzymatic region, EC:3.2.1.97, of the cell surface proteins that specifically cleave Gal-beta-1,3-GalNAc-alpha-Ser/Thr (T-antigen, galacto-N-biose), the core 1 type O-linked glycan common to mucin glycoproteins. This reaction is exemplified by the S. pneumoniae protein Endo-alpha-N-acetylgalactosaminidase, where Asp764 is the catalytic nucleophile-base and Glu796 the catalytic proton donor.

Carbohydrate binding domain X2. This domain binds to cellulose and to bacterial cell walls. It is found in glycosyl hydrolases and in scaffolding proteins of cellulosomes (multiprotein glycosyl hydrolase complexes). In the cellulosome it may aid cellulose degradation by anchoring the cellulosome to the bacterial cell wall and by binding it to its substrate. This domain has an Ig-like fold.

Thenative structure of GH101 from Streptococcus pneumoniae TIGR4 [Streptococcus pneumoniae TIGR4]

Thestructure of GH101 from Streptococcus pneumoniae TIGR4 in complex with PUGT [Streptococcus pneumoniae TIGR4]

Thestructure of GH101 from Streptococcus pneumoniae TIGR4 in complex with 1-O-methyl-T-antigen [Streptococcus pneumoniae TIGR4]

Thestructure of GH101 E796Q mutant from Streptococcus pneumoniae TIGR4 in complex with T-antigen [Streptococcus pneumoniae TIGR4],5A5A_A The structure of GH101 E796Q mutant from Streptococcus pneumoniae TIGR4 in complex with PNP-T-antigen [Streptococcus pneumoniae TIGR4]

Thestructure of GH101 D764N mutant from Streptococcus pneumoniae TIGR4 in complex with serinyl T-antigen [Streptococcus pneumoniae TIGR4]

Putative endo-alpha-N-acetylgalactosaminidase OS=Renibacterium salmoninarum (strain ATCC 33209 / DSM 20767 / JCM 11484 / NBRC 15589 / NCIMB 2235) OX=288705 GN=RSal33209_1326 PE=3 SV=2

Endo-alpha-N-acetylgalactosaminidase OS=Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4) OX=170187 GN=SP_0368 PE=1 SV=1

Endo-alpha-N-acetylgalactosaminidase OS=Streptococcus pneumoniae (strain ATCC BAA-255 / R6) OX=171101 GN=spr0328 PE=1 SV=1