K. Ohta et al., MOLECULAR-CLONING AND SEQUENCE-ANALYSIS OF 2 ENDOINULINASE GENES FROMASPERGILLUS-NIGER, Bioscience, biotechnology, and biochemistry, 62(9), 1998, pp. 1731-1738
Two genomic DNAs encoding endoinulinase from Aspergillus niger 12 were
cloned and sequenced. Open reading frames (ORFs) of the endoinulinase
genes, inuA and inuB, both consisted of 1,548 nucleotides encoding 51
6 amino acids. It was suggested that the coding regions were not inter
rupted by introns, The ORFs differed from each other by 23 nucleotide
substitutions or by eight amino acid replacements, indicating that the
inuA and inuB genes arose by gene duplication. Each mature enzyme of
493 amino acids was preceded by a hydrophobic signal peptide of 23 ami
no acids. The enzymes contained two Cys residues and Eve potential sit
es for N-linked glycosylation. Partial amino acid sequences of the sec
reted enzyme suggested that it originated from the inuB gene product.
The deduced amino acid sequences of the mature A. niger enzymes showed
73% identity with that of the Penicillium purpurogenum endoinulinase.