A novel saccharifying α‐amylase of Antarctic psychrotolerant fungi Geomyces pannorum: Gene cloning, functional expression, and characterization
A DNA segment encoding a novel α‐amylase was cloned from the Antarctic psychrotolerant fungi Geomyces pannorum . The gene has an open reading frame of 1761 bp, deduced 586 amino acids, revealing a relatively low homology to α‐amylases from diverse fungal genera. The α‐amylase gene was overexpressed...
Published in: | Starch - Stärke |
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Main Authors: | , , , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2015
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Subjects: | |
Online Access: | http://dx.doi.org/10.1002/star.201500077 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fstar.201500077 https://onlinelibrary.wiley.com/doi/pdf/10.1002/star.201500077 |
Summary: | A DNA segment encoding a novel α‐amylase was cloned from the Antarctic psychrotolerant fungi Geomyces pannorum . The gene has an open reading frame of 1761 bp, deduced 586 amino acids, revealing a relatively low homology to α‐amylases from diverse fungal genera. The α‐amylase gene was overexpressed in Pichia pastoris , and the recombinant α‐amylase was purified and characterized. Enzymatic activity was optimal at pH 6.0 and 70°C, and the specific activity was 9.78 × 10 3 U/mg when using soluble starch as substrate. Moreover, the enzyme retained more than 90% of its maximum activity over a wide pH range (6.0–9.0). Exceptionally, the main hydrolysis products of soluble starch catalyzed by the enzyme were glucose and maltose, of which glucose reached a concentration of 68.8% (w/w). This is the first report on identifying thermophilic fungal amylase from psychrotolerant fungi. Also, the preliminary study on the high‐glucose‐producing α‐amylase with detailed enzymatic properties shows a potential application prospect in syrup industry. |
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