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Proteins with approximate molecular weights of greater than 300,000 (EP greater than 300K) and 49,000 (EP 49K) were partially purified from terminally differentiated cells of 2-day-old rat epidermis. They were extracted in 0.34 M sucrose containing 0.01 M citric acid and purified by Sephacryl S-300 chromatography followed by reverse-phase column chromatography. The major constituents of EP greater than 300K and EP 49K were focused around pH 10 to 11 by sucrose gradient isoelectric focusing. Both proteins were effective at inhibiting colony formation of Candida albicans and C. tropicalis, but neither inhibited the growth of C. parapsilosis. The effect was maximum below pH 5.0 and reduced considerably above pH 5.0. The activity of EP greater than 300K on C. albicans TIMM 1623 (group A) was much stronger than that of EP 49K, whereas both proteins similarly inhibited C. albicans TIMM 1604 (group B). Their effects against C. albicans TIMM 1623 were dose dependent and were activated after a longer preincubation time, and NaCl concentration influenced their potency. At a low salt concentration and a 60-min preincubation at pH 4.5, the 50% effective dose for EP greater than 300K was calculated to be 1.7 x 10(-9) M, whereas that for EP 49K was 1.8 x 10(-7) M.

Candidacidal activities of proteins partially purified from rat epidermis