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Updated: May 5, 2026

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050
Published on: May 13, 2020
[Microbial alpha-amylases: physicochemical properties, substrate specificity and domain structure]
Microbial alpha-amylases, crucial enzymes, exhibit diverse properties and substrate specificities. Optimizing their production conditions enhances enzyme activity for various applications.
Area of Science:
- Biochemistry and Molecular Biology
- Enzymology
- Microbial Biotechnology
Context:
- Microbial alpha-amylases are key enzymes in carbohydrate metabolism.
- Their production is often inducible, responding to starch or its hydrolysis products.
- Diverse microbial sources (bacteria, fungi, yeasts) produce alpha-amylases with varying characteristics.
Purpose:
- To review current literature on microbial alpha-amylase producers.
- To discuss their physico-chemical properties and substrate specificity.
- To highlight factors influencing enzyme activity and stability.
Summary:
- Alpha-amylases are glycosyl-hydrolases (GH-13 family) with a conserved (beta/alpha)8-barrel catalytic domain (A) and additional domains (B, C).
- Enzyme properties like molecular weight, pH/thermooptimum, and cofactor requirements (e.g., calcium ions) vary significantly.
- They hydrolyze a range of starch-based substrates, including soluble starch, amylose, amylopectin, and cyclodextrins.
Impact:
- Understanding these enzymes aids in optimizing industrial enzyme production.
- Knowledge of structure-function relationships can guide the development of novel alpha-amylases.
- This review provides a foundation for further research into microbial enzyme engineering.
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