Abstract
An antifungal protein that inhibits the growth of filamentous fungal pathogens was isolated from Chinese cabbage ( Brassica campestris L. ssp. pekinensis) by affinity chromatography on Affi-gel blue gel and ion exchange chromatography on CM-Sepharose. The N-terminal amino acid sequence of the protein was highly homologous to that of plant cyclophilins and consequently the protein was denoted as C-CyP. To understand the antifungal activity of C-CyP, we isolated a cDNA encoding its gene from a Chinese cabbage leaf cDNA library. The Chinese cabbage genome bears more than one C-CyP gene copy and C-CyP mRNA is highly expressed in all tissues except the seeds. Recombinant C-CyP catalyzed the cis– trans inter-conversion of the Ala–Pro bond of the substrate, which indicates this protein has peptidyl-prolyl cis– trans isomerase activity. It also inhibited the growth of several fungal pathogens.
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