Abstract
Four distinct bands of cysteine proteinase activity were detected when stationary-phase populations of Leishmania mexicana mexicana were subjected to gelatin-SDS-PAGE. The highest mobility band contained at least three isoforms separable by mono Q anion exchange chromatography. These high mobility activities were distinct from all the major amastigote enzymes. Stationary-phase promastigote populations also contained two acid-activable precursor forms of the promastigote-specific band. It is suggested that these promastigote-specific activities occur in the infective metacyclic stage of the parasite and may have a role in parasite survival upon inoculation into a mammal.
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