Requirement of an acidic proton in substances which act as accelerators of the deactivation reactions in the water‐splitting enzyme system of photosynthesis

Ренгер, Г.

doi:10.1016/0014-5793(72)80306-5

Cited by 27 publications

(2 citation statements)

References 11 publications

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“…The apparent acceleration observed under repetitive flash excitation is entirely due to the rapid decay of $2 and $3 between the flashes at properly selected ANT 2p concentration. ANT 2p is a strong protonophoric uncoupler (B/ichel and Sch~ifer 1970) with its anion form acting as the active species for the acceleration of $2 and $3 decay (Renger 1972b). Therefore, the present data show that ANT 2p does not interfere with hydrogen bridges that could be of functional relevance for the transition state of the electron transfer from Tyr-161 of D-1 to P680 ÷ .…”

Section: Discussionmentioning

confidence: 68%

Studies on the electron transfer from Tyr-161 of polypeptide D-1 to P680+ in PS II membrane fragments from spinach

Renger

Völker

1989

Photosynth Res

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The functional connection between redox component Y z identified as Tyr-161 of polypeptide D-1 (Debus et al. 1988) and P680(+) was analyzed by measurements of laser flash induced absorption changes at 830 nm in PS II membrane fragments from spinach. It was found that neither DCMU nor the ADRY agent 2-(3-chloro-4-trifluoromethyl) anilino-3,5-dinitrothiophene (ANT 2p) affects the rate of P680(+) reduction by Y z under conditions where the catalytic site of water oxidation stays in the redox state S1. In contrast to that, a drastic retardation is observed after mild trypsin treatment at pH=6.0. This effect which is stimualted by flash illumination can be largely reversed by Ca(2+). The above mentioned data lead to the following conclusions: (a) the segment of polypeptide D-1 containing Tyr-161 and coordination sites of P680 is not allosterically affected by structural changes due to DCMU binding at the QB-site which is also located in D-1. (b) ANT 2p as a strong protonophoric uncoupler and ADRY agent does not modify the reaction coordinate of P680(+) reduction by Y z , and (c) Ca(2+) could play a functional role for the electronic and vibrational coupling between the redox groups Y z and P680. The electron transport from Y z to P680(+) is discussed within the framework of a nonadiabatic process. Based on thermodynamic considerations the reorganization energy is estimated to be in the order of 0.5 V.

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Section: Discussionmentioning

confidence: 68%

Studies on the electron transfer from Tyr-161 of polypeptide D-1 to P680+ in PS II membrane fragments from spinach

Renger

Völker

1989

Photosynth Res

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“…This phenomenon has been designated as ADRY-effect* [2]. It has been shown that the agents which induce an ADRY-effect are characterized by their ability to act as uncouplers of phosphorylation and by the presence of an acidic NHor OH-group in their molecular structure [ 1,3] . The frequently used uncouplers S-chloro-3-tert.…”

Section: Introductionmentioning

confidence: 99%

The action of 5‐chloro‐3‐tert. butyl‐2′‐chloro‐4′‐nitro—salicylanilide and α,α′‐bis(hexafluoroacetonyl)aceton on the water‐splitting enzyme system Y in spinach chloroplasts

Ренгер¹

1975

FEBS Letters

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Structure‐activity relationship studies of dibromo phenolic derivatives as photosynthetic electron chain inhibitors

et al. 1986

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A number of 2,6‐dibromophenols with different substituents in the 4‐position have been synthesised and their effect on the whole electron transport chain and on photosystem II have been determined. A study was made to relate the chemical characteristics of the 4‐substituent group and the inhibition of the uncoupled electron transport of isolated chloroplasts from spinach plants. The chemical nature of the 4‐substituent group varies greatly in the active compounds and it is therefore suggested that this group does not participate in the inhibitor‐receptor interaction. The results indicated that the inhibiting power of these compounds increased with the electron‐attracting capacity of the 4‐substituent group, decreased with increase in its size and that there was no correlation with its hydrophobic nature.

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Requirement of an acidic proton in substances which act as accelerators of the deactivation reactions in the water‐splitting enzyme system of photosynthesis

Cited by 27 publications

References 11 publications

Studies on the electron transfer from Tyr-161 of polypeptide D-1 to P680+ in PS II membrane fragments from spinach

Studies on the electron transfer from Tyr-161 of polypeptide D-1 to P680+ in PS II membrane fragments from spinach

The action of 5‐chloro‐3‐tert. butyl‐2′‐chloro‐4′‐nitro—salicylanilide and α,α′‐bis(hexafluoroacetonyl)aceton on the water‐splitting enzyme system Y in spinach chloroplasts

Structure‐activity relationship studies of dibromo phenolic derivatives as photosynthetic electron chain inhibitors

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