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. 1994 Sep;60(9):3381–3389. doi: 10.1128/aem.60.9.3381-3389.1994

The gene amyE(TV1) codes for a nonglucogenic alpha-amylase from Thermoactinomyces vulgaris 94-2A in Bacillus subtilis.

B Hofemeister 1, S König 1, V Hoang 1, J Engel 1, G Mayer 1, G Hansen 1, J Hofemeister 1
PMCID: PMC201813  PMID: 7944369

Abstract

We isolated the gene amyE(TV1) from Thermoactinomyces vulgaris 94-2A encoding a nonglucogenic alpha-amylase (AmyTV1). A chromosomal DNA fragment of 2,247 bp contained an open reading frame of 483 codons, which was expressed in Escherichia coli and Bacillus subtilis. The deduced amino acid sequence of the AmyTV1 protein was confirmed by sequencing of several peptides derived from the enzyme isolated from a T. vulgaris 94-2A culture. The amino acid sequence was aligned with several known alpha-amylase sequences. We found 83% homology with the 48-kDa alpha-amylase part of the Bacillus polymyxa beta-alpha-amylase polyprotein and 50% homology with Taka amylase A of Aspergillus oryzae but only 45% homology with another T. vulgaris amylase (neopullulanase, TVA II) recently cloned from strain R-47. The putative promoter region was characterized with primer extension and deletion experiments and by expression studies with B. subtilis. Multiple promoter sites (P3, P2, and P1) were found; P1 alone drives about 1/10 of the AmyTV1 expression directed by the native tandem configuration P3P2P1. The expression levels in B. subtilis could be enhanced by fusion of the amyE(TV1) coding region to the promoter of the Bacillus amyloliquefaciens alpha-amylase gene.

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Selected References

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