Direct assignment of vitamin K1 as the secondary acceptor A1 in photosystem I

Seth W. Snyder; Richard R. Rustandi; John Biggins; James R. Norris; Marion C. Thurnauer

Direct assignment of vitamin K₁ as the secondary acceptor A₁ in photosystem I

Seth W. Snyder
, Richard R. Rustandi
, John Biggins
, James R. Norris
, Marion C. Thurnauer

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

47 Scopus citations

Abstract

The characteristic electron spin polarized electron paramagnetic resonance (ESP EPR) signal observed in photosystem I (PSI) has been previously assigned to a radical pair composed of the oxidized primary donor and a reduced vitamin K₁. Under conditions in which Bottin, H. & Sétif, P. [(1991), Biochim. Biophys. Acta 105, 331-336] proposed that A₁ is doubly reduced, the ESP EPR signal was not observed. Therefore, the ESP EPR signal can be directly attributed to A₁^-, and vitamin K₁ can be assigned as this PSI acceptor. The ESP EPR signal was partially restored by removal of the chemical reductants.

Original language	English
Pages (from-to)	9895-9896
Number of pages	2
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	88
Issue number	21
State	Published - 1991
Externally published	Yes

Keywords

Electron spin polarization electron paramagnetic resonance
Photosynthesis
Photosystem i reactions
Quinones

Cite this

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title = "Direct assignment of vitamin K1 as the secondary acceptor A1 in photosystem I",

abstract = "The characteristic electron spin polarized electron paramagnetic resonance (ESP EPR) signal observed in photosystem I (PSI) has been previously assigned to a radical pair composed of the oxidized primary donor and a reduced vitamin K1. Under conditions in which Bottin, H. \& S{\'e}tif, P. [(1991), Biochim. Biophys. Acta 105, 331-336] proposed that A1 is doubly reduced, the ESP EPR signal was not observed. Therefore, the ESP EPR signal can be directly attributed to A1-, and vitamin K1 can be assigned as this PSI acceptor. The ESP EPR signal was partially restored by removal of the chemical reductants.",

keywords = "Electron spin polarization electron paramagnetic resonance, Photosynthesis, Photosystem i reactions, Quinones",

author = "Snyder, \{Seth W.\} and Rustandi, \{Richard R.\} and John Biggins and Norris, \{James R.\} and Thurnauer, \{Marion C.\}",

year = "1991",

language = "English",

volume = "88",

pages = "9895--9896",

journal = "Proceedings of the National Academy of Sciences of the United States of America",

issn = "0027-8424",

publisher = "National Academy of Sciences",

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}

TY - JOUR

T1 - Direct assignment of vitamin K1 as the secondary acceptor A1 in photosystem I

AU - Snyder, Seth W.

AU - Rustandi, Richard R.

AU - Biggins, John

AU - Norris, James R.

AU - Thurnauer, Marion C.

PY - 1991

Y1 - 1991

N2 - The characteristic electron spin polarized electron paramagnetic resonance (ESP EPR) signal observed in photosystem I (PSI) has been previously assigned to a radical pair composed of the oxidized primary donor and a reduced vitamin K1. Under conditions in which Bottin, H. & Sétif, P. [(1991), Biochim. Biophys. Acta 105, 331-336] proposed that A1 is doubly reduced, the ESP EPR signal was not observed. Therefore, the ESP EPR signal can be directly attributed to A1-, and vitamin K1 can be assigned as this PSI acceptor. The ESP EPR signal was partially restored by removal of the chemical reductants.

AB - The characteristic electron spin polarized electron paramagnetic resonance (ESP EPR) signal observed in photosystem I (PSI) has been previously assigned to a radical pair composed of the oxidized primary donor and a reduced vitamin K1. Under conditions in which Bottin, H. & Sétif, P. [(1991), Biochim. Biophys. Acta 105, 331-336] proposed that A1 is doubly reduced, the ESP EPR signal was not observed. Therefore, the ESP EPR signal can be directly attributed to A1-, and vitamin K1 can be assigned as this PSI acceptor. The ESP EPR signal was partially restored by removal of the chemical reductants.

KW - Electron spin polarization electron paramagnetic resonance

KW - Photosynthesis

KW - Photosystem i reactions

KW - Quinones

UR - https://www.scopus.com/pages/publications/0026094572

M3 - Article

C2 - 11607234

AN - SCOPUS:0026094572

SN - 0027-8424

VL - 88

SP - 9895

EP - 9896

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

IS - 21

ER -

Direct assignment of vitamin K₁ as the secondary acceptor A₁ in photosystem I

Abstract

Keywords

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