Hexosaminidase B (HEXB), also designated beta-hexosaminidase B, is a Hexosaminidase B (HEXB), also designated b-hexosaminidase B, is a tetramer of two b-A and two b-B chains and is found in the lysosomes of cells. Sandhoff disease (SD), also known as GM2-gangliosidosis type II, is caused by mutations in the HEXB gene that affect the b subunit. These mutations disrupt the activity of HEXB and HEXA, which prevents the breakdown of GM2 ganglioside, a fatty material found in the brain, therby rendering both the HEXA and HEXB enzymes deficient. SD is a rare autosomal recessive disorder characterized by an accumulation of GM2 ganglioside, which causes progressive destruction of the central nervous system. Sandhoff disease is similar to Tay-Sachs disease, which is caused by mutations in the HEXA gene, although SD is more severe.
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Protein Aliases: Beta-hexosaminidase subunit beta; Beta-hexosaminidase subunit beta chain A; Beta-hexosaminidase subunit beta chain B; Beta-N-acetylhexosaminidase subunit beta; Cervical cancer proto-oncogene 7 protein; epididymis luminal protein 248; epididymis secretory protein Li 111; HCC-7; hexosaminidase B (beta polypeptide); Hexosaminidase subunit B; N-acetyl-beta-glucosaminidase subunit beta
Gene Aliases: ENC-1AS; HCC7; HEL-248; HEL-S-111; HEXB
Molecular Function: glycosidase