PfoI, a unique type II restriction endonuclease that recognises the sequence 5'-T downward arrow CCNGGA-3'

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M Gaigalas1, Z Maneliene, R Kazlauskiene

  • 1Institute of Biotechnology and. Fermentas UAB, Graiciūno 8, 2028 Vilnius, Lithuania.

Nucleic Acids Research
|October 5, 2002
PubMed

Insights

Researchers purified a novel enzyme, PfoI, from Pseudomonas fluorescens. This type II restriction endonuclease recognizes and cleaves specific DNA sequences, producing unique 5-prime ends.

Area of Science:

  • Molecular Biology
  • Enzymology
  • Genetics

Background:

  • Restriction endonucleases are crucial tools in molecular biology for DNA manipulation.
  • Understanding novel restriction enzymes expands the toolkit for genetic engineering and research.

Purpose of the Study:

  • To identify and characterize a new type II restriction endonuclease from Pseudomonas fluorescens.
  • To determine the DNA recognition sequence and cleavage site of the novel enzyme.

Main Methods:

  • Partial purification of the restriction endonuclease PfoI from Pseudomonas fluorescens biovar 126.
  • DNA cleavage assays to determine the recognition sequence and cleavage pattern.

Main Results:

  • A new type II restriction endonuclease, PfoI, was partially purified.
  • PfoI recognizes the interrupted hexanucleotide palindromic sequence 5'-T CCNGGA-3'.
  • PfoI cleaves DNA at this site, generating protruding 5'-pentanucleotide ends.

Conclusions:

  • PfoI is a novel restriction endonuclease with a unique recognition site.
  • The enzyme's specific cleavage pattern makes it a potentially valuable tool for molecular biology applications.

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