Energy distribution between Photosystems I and II in the photosynthetic prokaryote Prochlorothrix hollandica involves a chlorophyll ab antenna which associates with Photosystem I

Biogenesis of Thylakoid Membranes in Chlamydomonas reinhardtii y1 (A Kinetic Study of Initial Greening)

“…5), suggested that energy was initially transferred into PSI centers from LHCII. An analogous situation exists in Prochlorothrix hollandica, in which the photosystems normally are lot segregated (Post et al, 1993). Light of 650 nm, such as that used in our analysis of fluorescence induction kinetics, promoted a state-1 to state-2 transition during a period of 15 to 20 min in Prochlorothrix, and the resulting fluorescence induction transient was similar to that obtained with greening Chlamydomonas (Fig.…”

The Microenvironment and Photosynthetic Performance of Prochloron SP. in Symbiosis with Didemnid Ascidians

“…Whether Pcb moves between the photosystems and thereby redistributes energy between PSI and PSII is not fully established, although evidence to that effect was presented (Post et al 1993): the evidence could be interpreted as the dissociation of Pcb form PSII without its re-association with PSI. Schuster et al (1985) established that the light-harvesting protein in Prochloron is permanently phosphorylated in the light.…”

The photosynthetic machinery in prochlorophytes: Structural properties and ecological significance

“…Unlike the situation in higher plants, there is growing evidence that a very significant fraction of the Prochlorophyte antenna has a structural and functional association with PSi. A number of papers from five separate laboratories have reported that the bulk of the antenna apoproteins and Chl b both co-purify with PS I and that Chl b transfers excitation energy efficiently to PS l in Prochlolvn and Prochlorothrix [36,56,[66][67][68][71][72][73]. One research group has claimed that the antenna is largely bound to PS u particles after solubilization in Zwittergent 14 [74].…”

“…Current phylogcnctic data suggest that Chl b evolved more than once, even among the Prochlorophytes. An argument in favor of a monophyletic origin for the Prochlorophytc antenna comes from work demonstrating immunological relationships between the Prochloron and Prochlorothrix antenna apoproteins [53], and their functional associations with PSI [66][67][68][71][72][73].…”

“…The composition of PSII particles is somewhat less clear, but the major components of the PS u complex have been identified. These include the Chl a-binding polypeptides CP47 and CP43 (47 and 43-kDa molecular mass chlorophyll protein, respectively) [46,67]; the reaction center proteins DI and D2 ( [45,73]; Bullerjahn and Krugh, unpublished results); the 10-kDa psbH protein [47]; and the 33-kDa psbO protein involved in stabilizing the donor (water-splitting) side of PS u [82,83]. The psbO gene product or manganese stabilizing protein (MSP) of Prochlorothrix was found to be a hydrophobic protein as compared contrasting with the morte hydrophilic MSP found in a green alga and a cyanobacterium [83].…”