L-methionine gamma-lyase (MGL)

Volatile sulfur compound-producing bacterial enzymes are a functional group of microbial enzymes, most notably L-methionine gamma-lyase (MGL) and cysteine desulfhydrase, that catalyze the degradation of sulfur-containing amino acids into malodorous gases. These enzymes are primarily expressed by anaerobic Gram-negative bacteria such as Porphyromonas gingivalis, Treponema denticola, and Fusobacterium nucleatum, which are common inhabitants of the oral cavity and the gastrointestinal tract. The primary metabolic products—hydrogen sulfide, methyl mercaptan, and dimethyl sulfide—are the main contributors to halitosis and have been implicated in the progression of periodontal disease by inducing inflammation and increasing tissue permeability. Therapeutic interventions often target these enzymes using metal ions like zinc, which both inhibit enzymatic activity and chemically neutralize the produced gases. Additionally, antimicrobial agents and probiotics are used to manage the bacterial populations responsible for enzyme production, while experimental inhibitors like propargylglycine are being explored for more precise enzymatic targeting.

Other names

Methionine gamma-lyaseMethioninaseL-methionine gamma-lyase-deaminaseMgldMEGLC-S lyaseVolatile sulfur compound-producing bacterial enzymes

Competitive inhibition of enzyme activity, direct enzymatic blockade, chemical neutralization of metabolic byproducts (VSCs), and reduction of bacterial populations expressing the enzymes.