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Related Experiment Video

Updated: Jun 25, 2026

Inhibition of Aspergillus flavus Growth and Aflatoxin Production in Transgenic Maize Expressing the α-amylase Inhibitor from Lablab purpureus L.

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Published on: February 15, 2019

Beta-amylase in germinating millet seeds.

Yoshiki Yamasaki¹

¹Research Institute for Bioresources, Okayama University, Kurashiki-shi, Okayama 710-0046, Japan. yosikiy@rib.okayama-u.ac.jp

|October 17, 2003

Summary

This summary is machine-generated.

Researchers isolated beta-amylase from millet seeds, finding it crucial for germination. This enzyme efficiently breaks down complex starches, aiding seed development.

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Area of Science:

Biochemistry
Plant Science

Background:

Beta-amylase (EC 3.2.1.2) plays a role in carbohydrate metabolism.
Understanding plant seed germination mechanisms is vital for agriculture.

Purpose of the Study:

To isolate and characterize beta-amylase from germinating millet (Panicum miliaceum L.) seeds.
To investigate the enzyme's substrate specificity and its role in seed germination.

Main Methods:

Enzyme isolation using ammonium sulfate fractionation, DEAE-cellulofine and CM-cellulofine chromatography, and preparative isoelectric focusing.
Enzyme characterization via SDS-PAGE, gel filtration, and determination of isoelectric point.
Substrate specificity analysis using various malto-oligosaccharides and starch types.

Main Results:

Homogeneous beta-amylase isolated with an estimated molecular weight of 58,000 Da and an isoelectric point of 4.62.
Enzyme showed highest activity on malto-oligosaccharides with >13 glucose residues and on amylose, amylopectin, and soluble starch.
Starch digestion was enhanced 2.5-fold when beta-amylase acted synergistically with alpha-amylase, pullulanase, and alpha-glucosidase.

Conclusions:

The isolated beta-amylase is a key enzyme in millet seed germination.
Its substrate specificity suggests a significant role in mobilizing starch reserves during early plant development.