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Related Experiment Videos

Pullulanase from rice endosperm.

Yoshiki Yamasaki1, Susumu Nakashima, Haruyoshi Konno

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

Acta Biochimica Polonica
|September 13, 2008
PubMed
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Rice seed pullulanase (EC 3.2.1.41) functions in both starch synthesis and degradation. This study isolated and characterized the enzyme, finding it identical in germinating and non-germinating seeds.

Area of Science:

  • Biochemistry
  • Plant Science
  • Enzymology

Background:

  • Pullulanase (EC 3.2.1.41) activity in rice seeds (Oryza sativa L.) during germination is not fully understood.
  • Investigating the role of pullulanase in both starch synthesis and degradation is crucial for understanding rice seed physiology.

Purpose of the Study:

  • To isolate and characterize pullulanase from rice seeds.
  • To compare pullulanase activity in germinating versus non-germinating rice seeds.
  • To elucidate the dual role of pullulanase in rice seed development and germination.

Main Methods:

  • Enzyme isolation using ammonium sulfate fractionation, DEAE-cellulofine chromatography, isoelectric focusing, and disc gel electrophoresis.
  • Enzyme characterization including SDS/PAGE, gel filtration, isoelectric point determination, and substrate specificity analysis.

Related Experiment Videos

  • Investigating enzyme inhibition by beta-cyclodextrin and activation by thiol reagents.

    • Main Results:

    • Isolated pullulanase is a single unit protein with a molecular weight of approximately 100,000-105,000 Da and an isoelectric point of 4.7.
    • The enzyme exhibited substrate inhibition by pullulan at concentrations above 0.1% but hydrolyzed amylopectin, soluble starch, and beta-limit dextrin with increasing efficiency.
    • Pullulanase demonstrated alpha-glucosyltransfer activity, producing maltotriose dimers from pullulan.

    Conclusions:

    • The same pullulanase is present in both germinating and non-germinating rice seeds, suggesting a conserved function.
    • This rice seed pullulanase likely plays a role in both starch synthesis during ripening and starch degradation during germination.
    • The enzyme's unique substrate inhibition and transferase activity offer insights into its physiological roles in rice seed metabolism.