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Bioengineered emulsans from Acinetobacter calcoaceticusRAG-1 transposon mutants.

A K Johri1, W Blank, D L Kaplan

  • 1Department of Chemical and Biological Engineering, Bioengineering and Biotechnology Center, Tufts University, 4 Colby Street, Medford, MA 02155, USA.

Applied Microbiology and Biotechnology
|July 12, 2002
PubMed
Summary

Researchers engineered Acinetobacter calcoaceticus to control fatty acid (FA) patterns in emulsan, a bioemulsifier. Specific mutants showed enhanced emulsifying activity, paving the way for tailored bioemulsifiers.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Biotechnology

Background:

  • Emulsan, a bioemulsifier produced by Acinetobacter calcoaceticus, has potential applications in various industries.
  • Controlling the fatty acid (FA) composition of emulsan is crucial for optimizing its properties.

Purpose of the Study:

  • To investigate the impact of gene disruptions on FA substitution patterns in emulsan.
  • To characterize structural variants of emulsan produced by transposon mutants.
  • To explore the bioengineering of microorganisms for tailored bioemulsifier production.

Main Methods:

  • Generating transposon mutants of Acinetobacter calcoaceticus strain RAG-1.
  • Disrupting genes involved in biotin, histidine, cysteine, and purine biosynthesis.
  • Characterizing emulsan yield, FA content, molecular weight, and emulsification behavior.

Related Experiment Videos

  • Supplementing growth media with fatty acids of varying chain lengths (C11-C18).

    • Main Results:

    • Disrupted genes influenced the level and types of FAs incorporated into emulsan.
    • Emulsan yields were lower in mutants than the parent strain and varied with supplemented FAs.
    • Specific mutants (13D [His-] and 52D [Cys-]) showed enhanced emulsifying activity on C16 and C14 supplemented media, respectively.
    • High percentages of C16 (48%) and C18 (42%) FAs on the polysaccharide backbone significantly influenced emulsification behavior.

    Conclusions:

    • Gene disruptions offer a method to control FA composition and emulsification properties of bioemulsifiers.
    • Engineered Acinetobacter calcoaceticus strains can produce tailored emulsan variants.
    • This research provides a pathway for developing novel amphipathic structures for environmental, biomedical, and personal care applications.