Catalase HPI influences membrane permeability in Escherichia coli following near-UV stress

Sara Levén*, Amy Heimberger, Abraham Eisenstark

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The katG gene in Escherichia coli encodes catalase HPI, which is involved in membrane transport and protects the cell during oxidative stress. Hydrogen peroxide (H2O2) induces synthesis of HPI. We examined the role of HPI in membrane permeability (proline uptake) following exposure to near-ultraviolet radiation (NUV). We found that NUV resulted in the same type of induction as H2O2. KatG::Tn10 cells experienced a large drop in uptake after NUV exposure, and levels remained low following incubation. A strain carrying a katG+ plasmid, however, showed considerably less decrease in uptake after NUV, and uptake quickly resumed upon incubation. Further, in an srd mutant which lacks 4-thiouracil, NUV resulted in only a small drop in proline uptake, which was immediately resumed.

Original languageEnglish (US)
Pages (from-to)1224-1228
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number3
StatePublished - Sep 28 1990
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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