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Morrenain b I, a Papain-Like Endopeptidase from the Latex of Morrenia brachystephana Griseb. (Asclepiadaceae)

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Abstract

A new cysteine endopeptidase (morrenain b I) has been purified and characterized from the latex of stems and petiols of Morrenia brachystephana Griseb. (Asclepiadaceae). Morrenain b I was the minor proteolytic component in the latex but showed higher specific activity than morrenain b II, which was the main active fraction. Both enzymes showed similar pH profiles and molecular masses, but kinetic parameters and N-terminal sequences were quite distinct, demonstrating that they are different enzymes instead of different forms of the same enzyme.

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Correspondence to Sandra E. Vairo Cavalli.

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Vairo Cavalli, S.E., Arribére, M.C., Cortadi, A. et al. Morrenain b I, a Papain-Like Endopeptidase from the Latex of Morrenia brachystephana Griseb. (Asclepiadaceae). J Protein Chem 22, 15–22 (2003). https://doi.org/10.1023/A:1023059525861

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