Beta-glucosidase (Almond emulsin) (BGL)

Almond emulsin beta-glucosidase is a well-characterized glycoside hydrolase enzyme derived from the seeds of the almond tree, Prunus dulcis (UniProt: P06650). It primarily functions by catalyzing the hydrolysis of terminal, non-reducing beta-D-glucosyl residues, releasing beta-D-glucose and various aglycones (IUBMB). In its natural plant context, it is responsible for the breakdown of amygdalin into glucose, benzaldehyde, and hydrogen cyanide, a process known as cyanogenesis (Wikipedia). In pharmacology, this enzyme is utilized in experimental enzyme-prodrug therapies (EPT), such as Antibody-Directed Enzyme Prodrug Therapy (ADEPT), where it is targeted to tumor cells to locally activate the prodrug amygdalin (Syrigos et al., 1998, British Journal of Cancer). This activation releases toxic cyanide specifically within the tumor microenvironment to induce apoptosis in malignant cells (PubMed). Furthermore, it serves as a critical biochemical model for human lysosomal beta-glucosidase, facilitating the screening of inhibitors and pharmacological chaperones for the treatment of Gaucher disease (PubChem). However, therapeutic use is limited by the potential for systemic cyanide poisoning and the inherent immunogenicity of a non-human protein (NIH).

Other names

AmygdalaseGentiobiaseCellobiaseBeta-D-glucoside glucohydrolaseEmulsinPrunus dulcis beta-glucosidase

Catalytic hydrolysis of terminal, non-reducing beta-D-glucosyl residues with release of beta-D-glucose; used in enzyme-prodrug therapy to convert cyanogenic glycosides into cytotoxic hydrogen cyanide.