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Related Experiment Videos

Aspergillus ficuum phytase: partial primary structure, substrate selectivity, and kinetic characterization.

A H Ullah1

  • 1Southern Regional Research Laboratory, ARS, USDA, New Orleans, Louisiana 70124.

Preparative Biochemistry
|January 1, 1988
PubMed
Summary

Aspergillus ficuum phytase exhibits optimal activity at pH 5.0 for phytate hydrolysis. While enzyme kinetics (Km) remained stable, temperature affected its catalytic rate (Kcat), with manganese enhancing activity.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Phytases are crucial enzymes for releasing inorganic phosphate from phytate.
  • Understanding phytase structure and kinetics is vital for optimizing its industrial applications.

Purpose of the Study:

  • To elucidate the partial primary structure and composition of Aspergillus ficuum phytase.
  • To determine the kinetic parameters and substrate specificity of the enzyme under varying conditions.

Main Methods:

  • Purification and characterization of Aspergillus ficuum phytase.
  • Kinetic analysis (Km, Kcat) at different pH and temperatures.
  • Substrate selectivity and cation sensitivity assays.

Main Results:

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  • Partial primary structure, amino acid, and sugar composition were determined.
  • Km for phytate was stable, but Kcat varied with pH and temperature.
  • Optimal pH for phytate hydrolysis was 5.0; Mn++ enhanced activity, while Cu++, Zn++, and Fe++ inhibited it.
  • The enzyme showed high substrate preference for phytate.

Conclusions:

  • Aspergillus ficuum phytase is a robust enzyme with specific kinetic properties.
  • Its activity is modulated by pH, temperature, and specific cations, offering potential for tailored applications.