Glycoside Hydrolase Family 145

Activities in FamilyL-Rhα-α-1,4-GlcA-specific α-L-rhamnosidase (EC 3.2.1.-)
Mechanism Retaining
3D Structure Statusseven-bladed β-propeller
Catalytic Nucleophile/BaseHis
NoteCreated after Munoz-Munoz et al., Proc. Natl. Acad. Sci. USA (2017) (PMID=28396425); these enzymes hydrolyze a-L-rhamnose residues linked to position 4 of a glucuronic acid using an unusual catalytic machinery comprising a histidine residue. The active site of these a-L-rhamnosidases is located on the opposite side of CAZymes with similar b-propeller folds. Surprisingly, the "normal" side of the b-propeller bears the highest residue conservation in the family and may well have another function. The latter is unknown but strong ressemblance to family PL25 suggests a polysaccharide lyase activity.
Statistics GenBank accession (99); Uniprot accession (1); PDB accession (5); 3D entries (4); cryst (0)
Bacteria
Protein Name EC#OrganismGenBank UniprotPDB/3D
 L-Rhα-a-1,4-GlcA α-L-rhamnohydrolase (BACCELL_00856) 3.2.1.- Bacteroides cellulosilyticus DSM 14838 EEF91490.1   5MVH[A]
 L-Rhα-a-1,4-GlcA α-L-rhamnohydrolase / exo-acting α-L-rhamnosidase (BT3686;BT_3686) 3.2.1.- Bacteroides thetaiotaomicron VPI-5482 AAO78791.1   5MUK[A]
5MUL[A]
 L-Rhα-a-1,4-GlcA α-L-rhamnohydrolase (HMPREF9455_02360) 3.2.1.- Dysgonomonas gadei ATCC BAA-286 EGK01332.1    
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