l-histidine hydrochloride

Histidine (abbreviated as His or H) is an alpha-amino acid. The L-isomer is one of the 22 proteinogenic amino acids, i.e., the building blocks of proteins. It is classified as a charged, polar because of the hydrophilic nature of the imidazole side chain.

N-a-Tosyl-L-lysinyl-chloromethylketone hydrochloride (TLCK hydrochloride) is an irreversible serine protease inhibitor that functions by alkylating the histidine residue at the active site, thus inhibiting trypsin and trypsin-like proteases. It effectively inhibits caspase-3, caspase-6, and caspase-7 with IC50 values of 12.0, 54.5, and 19.3 μM, respectively. Additionally, N-a-Tosyl-L-lysinyl-chloromethylketone hydrochloride induces apoptosis in HL-60 cells and prevents the reduction of mitochondrial transmembrane potential during the apoptosis process.

3-Methyl-L-histidine-D3 hydrochloride istidine-D3 hydrochloride is the deuterated form of 3-Methyl-L-histidine hydrochloride. This compound is an endogenous amino acid found within actin and myosin.