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Obtaining high transesterification activity for subtilisin in ionic liquids.

Shweta Shah1, Munishwar N Gupta

  • 1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

Biochimica Et Biophysica Acta
|November 23, 2006
PubMed
Summary

Improving enzyme performance in ionic liquids is crucial. Enzyme precipitated and rinsed with n-propanol (EPRP) significantly enhanced subtilisin

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Area of Science:

  • Biocatalysis
  • Enzyme Engineering
  • Ionic Liquids

Background:

  • Subtilisin exhibits limited transesterification activity in ionic liquids.
  • Developing robust biocatalysts for ionic liquid environments is essential for enzymatic synthesis.

Purpose of the Study:

  • To explore and identify effective methods for preparing subtilisin biocatalysts with enhanced transesterification activity in ionic liquids.
  • To overcome the poor enzymatic performance of subtilisin in non-aqueous media.

Main Methods:

  • Investigated various biocatalyst preparation techniques for subtilisin.
  • Evaluated transesterification activity of prepared biocatalysts in specific ionic liquids, including 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]).

Related Experiment Videos

  • Compared the efficacy of enzyme precipitated and rinsed with n-propanol (EPRP) method against pH tuned lyophilized powders.

    • Main Results:

    • The enzyme precipitated and rinsed with n-propanol (EPRP) method demonstrated a remarkable ~10,000-fold increase in initial transesterification rates in [Bmim][PF6] compared to pH tuned lyophilized subtilisin.
    • While pH tuned lyophilized subtilisin showed no activity in the water-soluble ionic liquid [Bmim][BF4], the EPRP preparation yielded a significant initial rate of 2.78 mmol mg⁻¹ h⁻¹.

    Conclusions:

    • The EPRP preparation method is highly effective in enhancing subtilisin's transesterification activity in ionic liquids.
    • This approach offers a viable strategy for utilizing enzymes in challenging ionic liquid media for biocatalytic applications.