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Recombinant nucleases CEL I from celery and SP I from spinach for mutation detection.

Maxim Pimkin1, Elena Caretti, Adrian Canutescu

  • 1Basic Science, Fox Chase Cancer Center, Philadelphia, PA, USA. MA_Pimkin@fccc.edu <MA_Pimkin@fccc.edu>

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|June 5, 2007
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Summary

Researchers express active recombinant plant mismatch endonucleases, including a spinach ortholog (SP I nuclease), for enhanced mutation detection. This breakthrough advances CEL I-based technologies for genetic research and medicine.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Mutation detection is crucial in research and medicine.
  • CEL I endonuclease from celery is a useful tool for high-throughput mutation screening.
  • Previously, active CEL I-like enzymes could not be expressed in bacteria.

Purpose of the Study:

  • To express active recombinant plant mismatch endonucleases.
  • To modify the activities of these enzymes.
  • To clone and characterize a CEL I ortholog from spinach (SP I nuclease).

Main Methods:

  • Cloning of a CEL I ortholog from Spinacia oleracea (spinach).
  • Expression of active recombinant CEL I and SP I nucleases as C-terminal hexahistidine fusions.
  • Affinity purification of recombinant enzymes.
  • Testing enzyme activity in mutation detection using patient-derived BRCA1 DNA.

Main Results:

  • Active recombinant CEL I and SP I nucleases were successfully expressed and purified.
  • Both enzymes demonstrated activity in detecting mutations in the BRCA1 gene.
  • Recombinant SP I nuclease showed enhanced cutting activity at single-nucleotide substitutions and loops compared to native SP nuclease.

Conclusions:

  • Insect cell-expressed CEL I orthologs may differ from native plant enzymes.
  • The developed expression system facilitates advancements in CEL I-based mutation detection technologies.