Methyl methanethiosulfonate (MMTS) is a versatile sulfur-containing reagent widely used in protein biochemistry for cysteine modification and disulfide bond formation studies. It acts as a methylsulfenylating agent that selectively modifies cysteine thiol groups. The compound has a density of 1.337 g/mL at 25°C, boiling point of 69-71°C at 0.4 mmHg, and characteristic refractive index of 1.513. MMTS is moisture-sensitive and should be stored under inert gas at -20°C. Safety precautions are essential due to its reactive nature (GHS Category 2 skin/eye irritant). Applications include proteomics research, enzyme inhibition studies, and as a building block in organic synthesis.
