Aliases for HEXB Gene
External Ids for HEXB Gene
Previous GeneCards Identifiers for HEXB Gene
Hexosaminidase B is the beta subunit of the lysosomal enzyme beta-hexosaminidase that, together with the cofactor GM2 activator protein, catalyzes the degradation of the ganglioside GM2, and other molecules containing terminal N-acetyl hexosamines. Beta-hexosaminidase is composed of two subunits, alpha and beta, which are encoded by separate genes. Both beta-hexosaminidase alpha and beta subunits are members of family 20 of glycosyl hydrolases. Mutations in the alpha or beta subunit genes lead to an accumulation of GM2 ganglioside in neurons and neurodegenerative disorders termed the GM2 gangliosidoses. Beta subunit gene mutations lead to Sandhoff disease (GM2-gangliosidosis type II). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2014]
GeneCards Summary for HEXB Gene
HEXB (Hexosaminidase Subunit Beta) is a Protein Coding gene. Diseases associated with HEXB include Sandhoff Disease and Gm2 Gangliosidosis. Among its related pathways are Sphingolipid metabolism and Lysosome. Gene Ontology (GO) annotations related to this gene include protein homodimerization activity and hydrolase activity, hydrolyzing O-glycosyl compounds. An important paralog of this gene is HEXA.
UniProtKB/Swiss-Prot Summary for HEXB Gene
Hydrolyzes the non-reducing end N-acetyl-D-hexosamine and/or sulfated N-acetyl-D-hexosamine of glycoconjugates, such as the oligosaccharide moieties from proteins and neutral glycolipids, or from certain mucopolysaccharides (PubMed:11707436, PubMed:9694901, PubMed:8672428, PubMed:8123671). The isozyme B does not hydrolyze each of these substrates, however hydrolyzes efficiently neutral oligosaccharide (PubMed:11707436). Only the isozyme A is responsible for the degradation of GM2 gangliosides in the presence of GM2A (PubMed:9694901, PubMed:8672428, PubMed:8123671).