GBA3
Description
The GBA3 (glucosylceramidase beta 3 (gene/pseudogene)) is a protein-coding gene located on chromosome 4.
Cytosolic beta-glucosidase, also known as cytosolic beta-glucosidase-like protein 1, is a beta-glucosidase (EC 3.2.1.21) enzyme that in humans is encoded by the GBA3 gene.
== Function == Cytosolic beta-glucosidase is a predominantly liver enzyme that efficiently hydrolyzes beta-D-glucoside and beta-D-galactoside, but not any known physiologic beta-glycoside, suggesting that it may be involved in detoxification of plant glycosides. GBA3 also has significant neutral glycosylceramidase activity (EC 3.2.1.62), suggesting that it may be involved in a non-lysosomal catabolic pathway of glucosylceramide metabolism.
Neutral cytosolic beta-glycosidase with a broad substrate specificity that could play a role in the catabolism of glycosylceramides (PubMed:11389701, PubMed:11784319, PubMed:20728381, PubMed:26724485, PubMed:17595169, PubMed:33361282). Has a significant glucosylceramidase activity in vitro (PubMed:26724485, PubMed:17595169). However, that activity is relatively low and its significance in vivo is not clear (PubMed:26724485, PubMed:17595169, PubMed:20728381). Hydrolyzes galactosylceramides/GalCers, glucosylsphingosines/GlcSphs and galactosylsphingosines/GalSphs (PubMed:17595169). However, the in vivo relevance of these activities is unclear (PubMed:17595169). It can also hydrolyze a broad variety of dietary glycosides including phytoestrogens, flavonols, flavones, flavanones and cyanogens in vitro and could therefore play a role in the metabolism of xenobiotics (PubMed:11784319). Possesses transxylosylase activity in vitro using xylosylated ceramides/XylCers (such as beta-D-xylosyl-(1<->1')-N-acylsphing-4-enine) as xylosyl donors and cholesterol as acceptor (PubMed:33361282). Could also play a role in the catabolism of cytosolic sialyl free N-glycans (PubMed:26193330). {ECO:0000269|PubMed:11389701, ECO:0000269|PubMed:11784319, ECO:0000269|PubMed:17595169, ECO:0000269|PubMed:20728381, ECO:0000269|PubMed:26193330, ECO:0000269|PubMed:26724485, ECO:0000269|PubMed:33361282}
GBA3 is also known as CBG, CBGL1, GLUC, KLRP.
