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cytosolic beta-glucosidase; cytosolic beta-glucosidase-like protein 1 (GBA3, CBG, CBGL1)

Function: 1) glycosidase 2) role in intestinal absorption & metabolism of dietary flavonoid glycosides 3) hydrolyzes variety of glycosides including phytoestrogens, flavonols, flavones, flavanones & cyanogens 4) beta-glycosylceramidase activity - may be involved in a nonlysosomal catabolic pathway of glycosylceramide 5) hydrolysis of terminal, non-reducing beta-D-glucose residues with release of beta-D-glucose Inhibition: - inhibited by - 2,4-dinitrophenyl-2-fluoro-2-deoxy-beta-D-glucopyranoside - sodium taurocholate Kinetic parameters: - KM=10 uM for luteolin-4'-glucoside; - KM=50 uM for luteolin-7-glucoside; - Vmax=1.30 umol/min/mg enzyme toward luteolin-4'-glucoside; - Vmax=2.85 umol/min/mg enzyme toward luteolin-7-glucoside; - Optimum pH is 6.5, active from pH 5 to 7.5 Structure: - belongs to the glycosyl hydrolase 1 family, Klotho subfamily - N-terminus is blocked Compartment: cytoplasm, cytosol Alternative splicing: named isoforms=2 Expression: - expressed in liver, small intestine, colon, spleen & kidney Pathology: - down-regulated in - renal cell carcinomas - hepatocellular carcinomas

General

glucosidase human longevity protein

Properties

SIZE: entity length = 469 aa MW = 54 kD COMPARTMENT: cytoplasm MOTIF: binding site SITE: 17-17 FOR-BINDING-OF: Substrate binding site SITE: 120-120 FOR-BINDING-OF: Substrate binding site SITE: 164-164 FOR-BINDING-OF: Substrate glutamate residue {E165} active site binding site SITE: 309-309 FOR-BINDING-OF: Substrate glutamate residue {E373} binding site SITE: 417-417 FOR-BINDING-OF: Substrate Substrate binding {424-425}

Database Correlations

OMIM 606619 UniProt Q9H227 Pfam PF00232 Entrez Gene 57733 Kegg hsa:57733 ENZYME 3.2.1.21

References

  1. UniProt :accession Q9H227
  2. UniProt PubMed refs - PMID: 17595169 - PMID: 11784319 - PMID: 12594539