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A genomic DNA segment and cDNAs encoding an extracellular endoinulinase of Penicillium sp. strain TN-88 were cloned and sequenced. Southern blot analysis indicated that the endoinulinase gene (inuC) was present as a single copy in the genome. An open reading frame, consisting of 1,545 bp, was not interrupted by introns, and it encoded a 25 amino acid signal peptide and a 490 amino acid mature protein. The mature protein contained three Cys residues and ten potential N-linked glycosylation sites. Three distinct transcriptional start points were observed at positions -242 (A), -215 (A), and -75 (C) from the start codon. The 5'-noncoding region had a putative TATA box at position -120 (TATATATA) and two contiguous CAAT sequences at -159 to -151. The deduced amino acid sequence showed 72 and 85% identities with those of Aspergillus niger and Penicillium purpurogenum endoinulinase genes, respectively. A neighbor-joining tree showed that fungal endoinulinases form a distinct cluster from other members of the beta-fructofuranosidase superfamily and that they are more closely related to bacterial levanases than to a fungal fructosyltransferase, yeast invertases, or a yeast exoinulinase.

Molecular Cloning and Sequence Analysis of an Endoinulinase Gene from Penicillium sp. Strain TN-88