Monomeric sarcosine oxidase (MSOX)

Monomeric sarcosine oxidase (MSOX) is a flavin-dependent enzyme that catalyzes the oxidative demethylation of sarcosine (N-methylglycine) to produce glycine, formaldehyde, and hydrogen peroxide (Source: UniProt P40859). While primarily characterized in bacteria such as Bacillus sp. and Corynebacterium, it serves as a critical structural and mechanistic model for the human enzyme sarcosine dehydrogenase (SARDH) and other members of the flavoprotein family (Source: Trickey et al., 1999). In clinical diagnostics, MSOX is widely utilized in enzymatic assays to quantify creatinine and sarcosine levels, which are essential for monitoring renal function and metabolic health (Source: Clin Chem, 2009). Sarcosine has been identified as a potential metabolic biomarker for the progression of prostate cancer, suggesting that the regulation of sarcosine-metabolizing enzymes could have therapeutic implications (Source: Sreekumar et al., 2009). The enzyme is sensitive to competitive inhibitors like pyrrole-2-carboxylate and methylthioacetate, which are used to study its active site and electron transfer mechanisms (Source: Jorns et al., 1994). Although not a direct target for current systemic drugs, its role in diagnostic technology and its relationship to human metabolic disorders like sarcosinemia make it a protein of significant biomedical interest (Source: NIH PubChem).

Other names

Sarcosine:oxygen oxidoreductase (demethylating)Sarcosine oxidaseMSOX

Competitive inhibition of the substrate-binding site by carboxylic acid analogs