Flash Inactivation of Oxygen Evolution: IDENTIFICATION OF S(2) AS THE TARGET OF INACTIVATION BY TRIS.

Abstract:

:Brief saturating light flashes were used to probe the mechanism of inactivation of O(2) evolution by Tris in chloroplasts. Maximum inactivation with a single flash and an oscillation with period of four on subsequent flashes was observed. Analyses of the oscillations suggested that only the charge-collecting O(2)-evolving catalyst of photosystem II (S(2)-state) was a target of inactivation by Tris. This conclusion was supported by the following observations: (a) hydroxylamine preequilibration caused a three-flash delay in the inactivation pattern; (b) the lifetimes of the Tris-inactivable and S(2)-states were similar; and (c) reagents accelerating S(2) deactivation decreased the lifetime of the inactivable state. Inactivation proved to be moderated by F, the precursor of Signal II(s), as shown by a one flash delay with chloroplasts having high abundance of F. Evidence was obtained for cooperativity effects in inactivation and NH(3) was shown to be a competitive inhibitor of the Tris-induced inactivation. S(2)-dependent inactivation was inhibited by glutaraldehyde fixation of chloroplasts, possibly suggesting that inactivation proceeds via conformational changes of the S(2)-state.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Frasch WD,Cheniae GM

doi

10.1104/pp.65.4.735

subject

Has Abstract

pub_date

1980-04-01 00:00:00

pages

735-45

issue

4

eissn

0032-0889

issn

1532-2548

journal_volume

65

pub_type

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