Abstract
A fragment coding for a putative extracellular α-amylase, from the genomic library of the yeast Saccharomycopsis fibuligera KZ, has been subcloned into yeast expression vector pVT100L and sequenced. The nucleotide sequence revealed an ORF of 1,485 bp coding for a 494 amino acid residues long protein with 99% identity to the α-amylase Sfamy from S. fibuligera HUT 7212. The S. fibuligera KZ α-amylase (Sfamy KZ) belongs to typical extracellular fungal α-amylases classified in the glycoside hydrolase family 13, subfamily 1, as supported also by clustering observed in the evolutionary tree. Sfamy KZ, in addition to the essential GH13 α-amylase three-domain arrangement (catalytic TIM barrel plus domains B and C), does not contain any distinct starch-binding domain. Sfamy KZ was expressed as a recombinant protein in Saccharomyces cerevisiae and purified to electrophoretic homogeneity. The enzyme had a molecular mass 53 kDa and contained about 2.5% of carbohydrate. The enzyme exhibited pH and temperature optima in the range of 5–6 and 40–50 °C, respectively. Stable adsorption of the enzyme to starch granules was not detected but a low degradation of raw starch in a concentration-dependent manner was observed.
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Abbreviations
- Sfamy:
-
α-Amylase from Saccharomycopsis fibuligera HUT 7212
- Sfamy KZ:
-
α-amylase from S. fibuligera KZ
- ALP1 :
-
Gene coding for α-amylase from S. fibuligera HUT 7212
- LKA1:
-
α-Amylase 1 from Lipomyces kononenkoae
- LKA2:
-
α-Amylase 2 from Lipomyces kononenkoae
- CBM:
-
Carbohydrate-binding module
- SBD:
-
Starch-binding domain
- GH:
-
Glycoside hydrolase
- AMY1:
-
Barley α-amylase 1 (low pI isozyme)
- AMY2:
-
Barley α-amylase 2 (high pI isozyme)
- CAZy:
-
Carbohydrate-active enzymes
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Acknowledgments
This work was supported in part by the grant No. 2/0114/08 from the Slovak grant agency VEGA.
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Hostinová, E., Janeček, Š. & Gašperík, J. Gene Sequence, Bioinformatics and Enzymatic Characterization of α-Amylase from Saccharomycopsis fibuligera KZ. Protein J 29, 355–364 (2010). https://doi.org/10.1007/s10930-010-9260-6
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DOI: https://doi.org/10.1007/s10930-010-9260-6