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Related Experiment Videos

Novel polysaccharide-protein-based amphipathic formulations.

Horacio Bach1, David L Gutnick

  • 1Department of Molecular Microbiology and Biotechnology, Faculty of Life Science, Tel Aviv University, Ramat Aviv, 69978, Israel.

Applied Microbiology and Biotechnology
|September 21, 2005
PubMed
Summary

A novel esterase enzyme from Acinetobacter venetianus RAG-1 enhances the emulsification of various polysaccharides, creating stable oil-in-water emulsions. This enzyme

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Area of Science:

  • Biochemistry
  • Microbiology
  • Materials Science

Background:

  • Previous studies demonstrated that an esterase from Acinetobacter venetianus RAG-1 enhances the emulsification properties of the bioemulsifier emulsan and its derivative apoemulsan.
  • The oil-degrading microbe Acinetobacter venetianus RAG-1 produces an exocellular protein with emulsifying activity.

Purpose of the Study:

  • To investigate the ability of the his-tagged recombinant esterase from RAG-1 to enhance emulsion formation with various polysaccharides.
  • To determine the emulsifying activity and emulsion stability across a range of polysaccharides in the presence of the esterase.
  • To explore the potential role of conserved peptide sequences in the esterase's polysaccharide binding and emulsification enhancement.

Main Methods:

  • Utilized a his-tagged recombinant esterase from Acinetobacter venetianus RAG-1.

Related Experiment Videos

  • Tested the emulsifying activity of 18 different polysaccharides (microbial, plant, insect, synthetic) in the presence of the esterase.
  • Assessed the stability of the formed hexadecane-in-water emulsions.
  • Compared the activity of the RAG-1 esterase with a homologous esterase from Acinetobacter calcoaceticus BD4.
  • Analyzed the esterase sequence for conserved peptide sequences associated with polysaccharide binding.

    • Main Results:

    • The RAG-1 esterase successfully formed hexadecane-in-water emulsions with 18 different polysaccharides.
    • Emulsifying activities varied significantly, ranging from over 4800 U/mg protein/mg polysaccharide (apoemulsan) to 370 U/mg protein/mg polysaccharide (alginic acid).
    • Emulsion stability ranged from 58% to 95%, with seven polysaccharides yielding emulsions stable above 80%.
    • The esterase from Acinetobacter calcoaceticus BD4 showed no activity in enhancing emulsification.
    • The RAG-1 esterase sequence contains conserved peptide motifs known for carbohydrate/polysaccharide binding.

    Conclusions:

    • The esterase from Acinetobacter venetianus RAG-1 is a versatile agent capable of enhancing the emulsification of a wide array of polysaccharides.
    • The enzyme's ability to form stable emulsions suggests potential applications in various industries requiring emulsification.
    • Conserved peptide sequences within the esterase likely mediate its interaction with polysaccharides, contributing to its emulsifying function.