POL: ASP: 29th Annual Meeting: Abstracts

	29th Annual Meeting of the American Society of Photobiology
	Downtown Marriot
	Chicago, Il.	July 7th-12th, 2001

Photosystem I Reaction Centers with a Foreign Quinone in the A₁ site: Effect on Electron Transfer from A₀^- to Q

Savikhin, Sergei¹, Johnson, T. Wade¹, Martinsson, Peter ¹, Chitnis, Parag¹ and Struve, Walter¹
Iowa State University, Ames, IA 50011¹

Abstract-
Time-resolved absorption difference studies were performed on trimeric photosystem I complexes from a menB mutant of the cyanobacterium Synechocystis sp. PCC 6803. In this mutant, the native phylloquinone secondary electron acceptor A₁ is replaced by a foreign quinone, plastoquinone. The electron transfer from A₀^- to Q (which is complete within < 20 ps in wild-type PS I) is greatly decelerated in this mutant.

Keywords: photosystem I

29th Annual Meeting of the American Society of Photobiology

Downtown Marriot

Chicago, Il.

July 7th-12th, 2001