An ADMR T-S spectrum of the primary donor (P680) of photosystem II (PSII) was obtained from anaerobically photoreduced particles. The spectrum is the best resolved obtained so far having a main bleaching band at 684 nm with a linewidth of only 100 cm(-1). The view that this spectrum is produced by native homogeneous P680 unlike those obtained before is defended. A small bleaching observed at 678 nm is discussed in terms of the reaction center structure. One possible interpretation of the observations is that P680 is a very loose dimer with an exciton splitting of only 144 cm(-1) corresponding to a dimer center-to-center distance of roughly 11.5 Angstrom A.

A well resolved triplet minus singlet spectrum of P680 from PSII particles.

CARBONERA, DONATELLA;GIACOMETTI, GIOVANNI;
1994

Abstract

An ADMR T-S spectrum of the primary donor (P680) of photosystem II (PSII) was obtained from anaerobically photoreduced particles. The spectrum is the best resolved obtained so far having a main bleaching band at 684 nm with a linewidth of only 100 cm(-1). The view that this spectrum is produced by native homogeneous P680 unlike those obtained before is defended. A small bleaching observed at 678 nm is discussed in terms of the reaction center structure. One possible interpretation of the observations is that P680 is a very loose dimer with an exciton splitting of only 144 cm(-1) corresponding to a dimer center-to-center distance of roughly 11.5 Angstrom A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2458725
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