Pure forms of the singlet oxygen sensors TEMP and TEMPD do not inhibit Photosystem II

Éva Hideg, Zsuzsanna Deák, Marja Hakala-Yatkin, Maarit Karonen, A. William Rutherford, Esa Tyystjärvi, Imre Vass, Anja Krieger-Liszkay

Research output: Article

25 Citations (Scopus)


In a recent article (Hakala-Yatkin and Tyystjärvi BBA 1807 (2011) 243-250) it was reported that the singlet oxygen spin traps 2,2,6,6- tetramethylpiperidine (TEMP) and 2,2,6,6-tetramethyl-4-piperidone (TEMPD) inhibit Photosystem II (PSII), the water oxidizing enzyme. O 2 evolution, chlorophyll fluorescence and thermoluminescence were measured and were shown to be greatly affected by these chemicals. This work casts doubts over an earlier body of work in which these chemicals were used as spin traps for monitoring 1O 2 production when PSII was inhibited by high light intensities. Here we show that these spin probes hardly affect PSII. We show that the commercial batches of TEMPD and TEMP used by Hakala-Yatkin and Tyystjärvi contained impurities and/or derivatives that inhibited PSII and caused the specific effects on fluorescence. Earlier work that used pure spin traps to measure 1O 2 during photoinhibition, thus remains valid. However, concern must be expressed towards using these spin traps without proper controls.

Original languageEnglish
Pages (from-to)1658-1661
Number of pages4
JournalBiochimica et Biophysica Acta - Bioenergetics
Issue number12
Publication statusPublished - dec. 1 2011

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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