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A molecular study on recombinant pullulanase type I from Metabacillus indicus.

Zahraa Z Al-Mamoori1, Amira M Embaby2, Ahmed Hussein1

  • 1Biotechnology Department, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt.

AMB Express
|April 29, 2023
PubMed
Summary

This study presents the first cloning and characterization of a cold-adapted pullulanase type I from Metabacillus indicus. The enzyme exhibits promising stability and starch saccharification capabilities for industrial applications.

Keywords:
Biochemical characterizationCold-adapted pullulanase type IHeterologous expressionIn silico structural modelingMetabacillus indicus

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Commercial pullulanase type I enzymes are predominantly mesophilic or thermophilic, limiting their application in cold conditions.
  • There is a need for novel cold-adapted enzymes with robust industrial performance.

Purpose of the Study:

  • To clone, express, and characterize a cold-adapted pullulanase type I from Metabacillus indicus (Pull_Met).
  • To investigate the enzyme's structural properties, optimal conditions, stability, and potential for starch saccharification.

Main Methods:

  • Gene cloning and heterologous expression in Escherichia coli.
  • Enzyme purification and characterization (specific activity, molecular mass, optimal pH/temperature).
  • In silico structural modeling using I-TASSER.
  • Stability assays under various pH, temperature, metal ion, and detergent conditions.
  • Analysis of hydrolysis products and synergistic action with alpha-amylase.

Main Results:

  • The Pull_Met gene was successfully cloned and expressed, yielding a 79.1 kDa protein.
  • The enzyme showed optimal activity at pH 6.0 and 40°C, with significant stability across a range of pH and temperatures.
  • Pull_Met demonstrated good stability in the presence of various metal ions and detergents, including commercial laundry detergents.
  • Maltotriose was the sole product of pullulan hydrolysis, and synergistic action with alpha-amylase efficiently saccharified starch.

Conclusions:

  • Pull_Met is a novel cold-adapted pullulanase type I with favorable biochemical properties.
  • Its stability and starch-degrading capabilities make it a strong candidate for industrial applications, particularly in low-temperature processes.
  • This research opens avenues for developing new enzymatic solutions in industries requiring cold-active enzymes.