Abstract
cDNA clones encoding a cutinase expressed in cutin-induced cultures of the plant pathogen Monilinia fructicola were isolated using a protein-based strategy. The largest cDNA (Mfcut1) was found to contain an open reading frame of 603 bp that predicted a 20.2-kDa protein of 201 amino acids with a 20-amino-acid secretory signal peptide and a pI of 8.4. The predicted protein contained cutinase/lipase consensus sequences with active site serines and potential protein kinase phosphorylation sites. Comparison of the deduced amino sequence from Mfcut1 with other fungal cutinase sequences revealed new features, which include conserved cysteines, C-terminal aromatic residues, and a novel histidine substitution in the D-H active site motif. The presence in the growth medium of antioxidants, such as caffeic acid, suppressed mRNA accumulation and enzyme activity of a cutinase from M. fructicola. MFCUT1 was expressed at high levels as a His-tagged fusion protein in Pichia pastoris and purified to apparent homogeneity in a single step by Ni2+-nitrilotriacetic acid affinity chromatography. Analysis of variant MFCUT1 mutants in which the novel serine and histidine residues were replaced by site-directed mutagenesis indicated that these residues had an important effect on enzyme activity.
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