Abstract
Pit viper venoms contain multiple proteinases which cause considerable damage in tissues and systemic effects after envenomation. A proteinase, kallikrein-like enzyme, belonging to the serine group must play a very important role on systemic effects. The corresponding enzyme from Lachesis muta rhombeata venom was purified to homogeneity by a combination of isoelectrofocusing fractionation followed by one step of gel filtration HPLC. The enzyme focused with pI 5.0–6.5, it had a molecular mass of 32 kDa by gel filtration HPLC, had edematogenic activity, and induced a hypotensic effect in anesthetized rats. It exhibited strong N-α-tosyl-L-Arg methyl esterase (955.38 units/mg) and N-BZ-DL-Arg-pNA amidolytic (233.02 units/mg) activities, hydrolyzed tripeptide nitroanilide derivatives weakly or not at all, and cleaved selectively the A-α and B-β chains of fibrinogen, apparently leaving the Y-chain unaffected. The 30 N-terminal amino acid sequence of the L. m. rhombeata protein showed greatest identity (74% in 26 amino acids) with Crotalus viridis kallikrein-like protein, but significant similarities in sequence were observed with enzymes from other snake venoms and pig pancreatic kallikrein.
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Giovanni-De-Simone, S., Aguiar, A.S., Gimenez, A.R. et al. Purification, Properties, and N-Terminal Amino Acid Sequence of a Kallikrein-like Enzyme from the Venom of Lachesis muta rhombeata (Bushmaster). J Protein Chem 16, 809–818 (1997). https://doi.org/10.1023/A:1026372018547
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DOI: https://doi.org/10.1023/A:1026372018547