A nitroxide diuron analog as a probe for the mode of action of herbicides

Yona Siderer; Nelly Lavintman; Itzhak Ohad; Chaim Gilon

doi:10.1515/znc-1984-0505

A nitroxide diuron analog as a probe for the mode of action of herbicides

Yona Siderer
, Nelly Lavintman
, Itzhak Ohad
, Chaim Gilon^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

A new spin label nitroxide which is also a herbicide of the urea family has been synthesized. The nitroxide spin label derivative of diuron (ditempuron, DTPU) inhibits electron flow at the site of diuron inhibition of photosystem II (PSII) activity, and it is also reduced by electron flow from one of the first acceptors of PSII. The reduction of the nitroxide group of DTPU is inhibited by diuron or by trypsin treatment of the thylakoids but not by DNP-INT or DBMIB. It is suggested that DTPU binds specifically to and accepts electrons at the QB site.

Original language	English
Pages (from-to)	342-346
Number of pages	5
Journal	Zeitschrift fur Naturforschung - Section C Journal of Biosciences
Volume	39
Issue number	5
DOIs	https://doi.org/10.1515/znc-1984-0505
State	Published - 1 May 1984

Keywords

Chlamydomonas
Electron Spin Resonance
Nitroxide Spin Label
Photosynthesis Inhibitors
Spinach Photosynthesis

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abstract = "A new spin label nitroxide which is also a herbicide of the urea family has been synthesized. The nitroxide spin label derivative of diuron (ditempuron, DTPU) inhibits electron flow at the site of diuron inhibition of photosystem II (PSII) activity, and it is also reduced by electron flow from one of the first acceptors of PSII. The reduction of the nitroxide group of DTPU is inhibited by diuron or by trypsin treatment of the thylakoids but not by DNP-INT or DBMIB. It is suggested that DTPU binds specifically to and accepts electrons at the QB site.",

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AU - Gilon, Chaim

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N2 - A new spin label nitroxide which is also a herbicide of the urea family has been synthesized. The nitroxide spin label derivative of diuron (ditempuron, DTPU) inhibits electron flow at the site of diuron inhibition of photosystem II (PSII) activity, and it is also reduced by electron flow from one of the first acceptors of PSII. The reduction of the nitroxide group of DTPU is inhibited by diuron or by trypsin treatment of the thylakoids but not by DNP-INT or DBMIB. It is suggested that DTPU binds specifically to and accepts electrons at the QB site.

AB - A new spin label nitroxide which is also a herbicide of the urea family has been synthesized. The nitroxide spin label derivative of diuron (ditempuron, DTPU) inhibits electron flow at the site of diuron inhibition of photosystem II (PSII) activity, and it is also reduced by electron flow from one of the first acceptors of PSII. The reduction of the nitroxide group of DTPU is inhibited by diuron or by trypsin treatment of the thylakoids but not by DNP-INT or DBMIB. It is suggested that DTPU binds specifically to and accepts electrons at the QB site.

KW - Chlamydomonas

KW - Electron Spin Resonance

KW - Nitroxide Spin Label

KW - Photosynthesis Inhibitors

KW - Spinach Photosynthesis

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A nitroxide diuron analog as a probe for the mode of action of herbicides

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