Purification and partial characterization of an l-amino acid oxidase from bushmaster snake (Surucucu pico de jaca) Lachesis muta venom

RESUMO

L-amino-acid oxidase(L-AO) form the venom of Lachesi muta muta was purified 72 times (38%) by gel filtration on Sephadex G-100, followed by ion exchange chromatography on DEAE-cellulose and gel filtration on Sephacryl S-300. The protein was shown to be homogeneous by polyacrylamide gel electroforesis, immunoelectrophoresis, immunodiffusion and isoelectric focusing. Its specific activity was 44.4 units/mg protein, using 7.5 mM L-leucine as substrate a nd O-dianisidine as electron donor,at pH 7.6 and 25§C. The increase in absorbance at 436 nm was recorded. The enzyme was characterized as a glycoprotein with an S20,w=6.72,MW=138,000 and pI=5.2. It presented maxima at 389 and 460 nm and contained 2 mol of FAD per mole protein