Abstract:
:Suppression of electron flow (and its subsequent restoration with 3-10 mM NaHCO3) on the donor side of photosystem II is shown upon either a partial depletion of pea subchloroplast membranes in bicarbonate or the addition of 5-20 microM formate. At higher concentrations (5 mM) formate induces the known 'bicarbonate effect' on the acceptor side of photosystem II. In preparations depleted of manganese the restoration of electron flow with 0.1-0.2 microM MnCl2 (2-4 Mn per photosystem II reaction center) occurs only in the presence of bicarbonate and it is accompanied by an increased functional binding of manganese. Restoration of electron flow with diphenylcarbazide or NH2OH does not require the addition of NaHCO3. It is suggested that bicarbonate participates in the formation of the Mn-cluster capable of water oxidation or serves as a substrate for the water-oxidizing center.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Klimov VV,Allakhverdiev SI,Feyziev YaM,Baranov SVdoi
10.1016/0014-5793(95)00327-6subject
Has Abstractpub_date
1995-04-24 00:00:00pages
251-5issue
3eissn
0014-5793issn
1873-3468pii
0014579395003276journal_volume
363pub_type
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