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The filamentous ascomycete Sclerotinia sclerotiorum is well known for its ability to produce a large variety of hydrolytic enzymes. Two α-amylases ScAmy54 and ScAmy43 predicted to play an important role in starch degradation were showed to produce specific oligosaccharides essentially maltotriose that have a considerable commercial interest. Primary structure of the two enzymes was established by N-terminal sequencing, MALDI-TOF masse spectrometry and cDNA cloning. The two proteins have the same Nterminal catalytic domain and ScAmy43 derived from ScAmy54 by truncation of 96 amino acids at the carboxylterminal region. Data of genomic analysis suggested that the two enzymes originated from the same α-amylase gene and that truncation of ScAmy54 to ScAmy43 occurred probably during S. sclerotiorum cultivation. The structural gene of Scamy54 consisted of 9 exons and 8 introns, containing a single 1,500-bp open reading frame encoding 499 amino acids including a signal peptide of 21 residues. ScAmy54 exhibited high amino acid homology with other liquefying fungal α-amylases essentially in the four conserved regions and in the putative catalytic triad. A 3- D structure model of ScAmy54 and ScAmy43 was built using the 3-D structure of 2guy from A. niger as template. ScAmy54 is composed by three domains A, B, and C, including the well-known (β/α)8 barrel motif in domain A, have a typical structure of α-amylase family, whereas ScAmy43 contained only tow domains A and B is the first fungal α-amylase described until now with the smallest catalytic domain.

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