1887

Abstract

The gene () for a new type of pullulan-hydrolysing enzyme, neopullulanase, from TRS40 was sequenced. The DNA sequence revealed only one large open reading frame, composed of 1764 bases and 588 amino acid residues ( 69 144). Although the thermostable neopullulanase contained eight cysteine residues, they did not provide conformational stability by disulphide bonds. A comparison was made of the amino acid sequences of α-amylase, neopullulanase, isoamylase, pullulanase and cyclodextrin glucanotransferase. All the enzymes examined contained four highly conserved regions which probably constitute the active centres of the enzymes. The amino acid residues required for the specificity of neopullulanase are compared with those of α-amylase and other amylolytic enzymes.

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/content/journal/micro/10.1099/00221287-135-6-1521
1989-06-01
2022-01-29
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