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Summary

Researchers developed a new method to find robust proteases using diverse by-products and temperature screening. This approach identified a novel marine protease capable of efficiently hydrolyzing insoluble zein, valuable for the bio-based industry.

Keywords:
Agar screenFunctional metagenomicsProtease M10/M12Zein

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Area of Science:

  • Biotechnology
  • Enzyme Engineering
  • Marine Microbiology

Background:

  • The bio-based industry requires efficient and environmentally friendly biocatalysts.
  • Discovering novel proteases with industrial applicability from metagenomic libraries remains challenging.
  • Current screening methods for proteases are often limited in substrate range and conditions.

Purpose of the Study:

  • To develop an improved screening strategy for identifying robust proteases from marine metagenomic libraries.
  • To discover new proteases with broad substrate specificity and tolerance to industrial conditions.
  • To identify a novel protease capable of hydrolyzing insoluble substrates like zein.

Main Methods:

  • A two-step functional screening approach using six industry-relevant by-products (bone, feather, blood meals, gelatin, gluten, zein) as substrates.
  • Utilizing elevated temperature (55 °C) as a screening parameter to select for robust proteases.
  • Targeting 340,000 clones from marine bacterial and microbial community metagenomic libraries.
  • In silico analysis and recombinant expression of promising protease candidates in Escherichia coli.

Main Results:

  • Eleven clones showed protease activity against all tested substrates after incubation at 55 °C.
  • One novel marine protease was identified, exhibiting 58% sequence identity to known homologs.
  • This protease efficiently hydrolyzed insoluble zein at temperatures up to 50 °C and pH 9-11.
  • The protease is derived from a bacterial group previously unknown for zein degradation.

Conclusions:

  • A novel two-step, multi-substrate screening strategy effectively identifies robust proteases.
  • The discovered marine protease demonstrates significant potential for industrial applications, particularly in biorefineries.
  • This approach accelerates the discovery and optimization of enzymes for industrial demands, including the efficient processing of challenging substrates like zein.