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Related Experiment Videos

Exploring nitrilase sequence space for enantioselective catalysis.

Dan E Robertson1, Jennifer A Chaplin, Grace DeSantis

  • 1Diversa Corporation, San Diego, California 92121, USA. drobertson@diversa.com

Applied and Environmental Microbiology
|April 7, 2004
PubMed
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This summary is machine-generated.

Researchers discovered 137 novel nitrilases using environmental DNA (eDNA) screening. These enzymes offer a powerful new toolbox for enantioselective synthesis, overcoming limitations of previously known nitrilases.

Area of Science:

  • Biocatalysis and enzyme engineering
  • Synthetic chemistry
  • Environmental microbiology

Background:

  • Nitrilases are crucial enzymes in nitrile metabolism and valuable for chiral synthesis.
  • Limited availability and functional shortcomings of known nitrilases hinder their application.
  • A need exists for novel nitrilases with improved stability and specificity.

Purpose of the Study:

  • To discover and characterize a large number of novel nitrilases using a culture-independent approach.
  • To assess the substrate and stereospecificity of newly identified nitrilases for chiral synthesis.
  • To explore the phylogenetic diversity and evolutionary relationships within the nitrilase subfamily.

Main Methods:

  • Screening of over 600 biotope-specific environmental DNA (eDNA) libraries.

Related Experiment Videos

  • Culture-independent genomic capture and heterologous gene expression.
  • Selection-based expression assays and phylogenetic analysis of 137 unique nitrilases.
  • Enzyme characterization using three nitrile substrates for specificity and stereospecificity.

    • Main Results:

    • Discovery and characterization of 137 novel nitrilases.
    • Identification of at least five major phylogenetic clades within the nitrilase subfamily.
    • Correlation found between sequence clades and enzyme selectivity.
    • Demonstration of utility for enantiospecific synthesis of carboxylic acid derivatives.

    Conclusions:

    • A high-throughput, culture-independent method successfully expanded the nitrilase discovery.
    • The novel nitrilases provide a versatile catalytic toolbox for asymmetric synthesis.
    • These findings offer insights into nitrilase evolution and structural biology.