Lipids in and around photosynthetic reaction centres.

Acquisition of photosynthetic capacity by a reaction centre that lacks the Q(A) ubiquinone; possible insights into the evolution of reaction centres?

A photosynthetically impaired strain of Rhodobacter sphaeroides containing reaction centres with an alanine to tryptophan mutation at residue 260 of the M-polypeptide (AM260W) was incubated under photosynthetic growth conditions. This incubation produced photosynthetically competent strains containing suppressor mutations that changed residue M260 to glycine or cysteine. Spectroscopic analysis ...

Functional assembly of the chloroplast H+-ATPase and photosynthetic reaction centres.

Multiple photosynthetic reaction centres composed of supramolecular assemblies of zinc porphyrin dendrimers with a fullerene acceptor.

Multiple photosynthetic reaction centres have successfully been constructed using supramolecular complexes of zinc porphyrin dendrimers [D(ZnP)(n): n = 4, 8, 16] with fulleropyrrolidine bearing a pyridine ligand (C(60)py). Efficient energy migration occurs completely between the ZnP units of dendrimers prior to the electron transfer with increasing the generation of dendrimers to attain an extr...

Evolution of Photosynthesis

Photosynthesis is the conversion of radiant energy, as light, into stored chemical energy. The central process is a light-driven separation of electrical charge across a biological membrane. Photochemical reaction centres carry out this process, and their three-dimensional protein structures now indicate that all modern reaction centres are homologous. Reaction centres with light-harvesting com...

Chilling Susceptibility of the Blue-green Alga Anacystis nidulans: II. STIMULATION OF THE PASSIVE PERMEABILITY OF CYTOPLASMIC MEMBRANE AT CHILLING TEMPERATURES.

Potassium ions and amino acids were found to leak from the cytoplasm to the outer medium when the blue-green alga, Anacystis nidulans, was exposed to the chilling temperatures. The leakage was marked below the critical temperature regions, the midpoint values for which were around 5 and 14 C in cells grown at 28 and 38 C, respectively. These temperature regions coincided with those critical for...