Regulation by FurC in Anabaena Links the Oxidative Stress Response to Photosynthetic Metabolism.

The FUR (Ferric Uptake Regulator) family in Anabaena sp. PCC 7120 consists of three paralogs named FurA (Fur), FurB (Zur) and FurC (PerR). furC seems to be an essential gene in the filamentous nitrogen-fixing strain Anabaena sp.

Association of small CAB-like proteins (SCPs) of Synechocystis sp. PCC 6803 with Photosystem II.

The cyanobacterial small CAB-like proteins (SCPs) are one-helix proteins with compelling similarity to the first and third transmembrane helix of proteins belonging to the CAB family of light-harvesting complex proteins in plants. The SCP proteins are transiently expressed at high light intensity and other stress conditions but their exact function remains largely unknown. Recently we showed association of ScpD with light-stressed, monomeric Photosystem II in Synechocystis sp.

Sll1717 affects the redox state of the plastoquinone pool by modulating quinol oxidase activity in thylakoids.

A Synechocystis sp. strain PCC 6803 mutant lacking CtaI, a main subunit of cytochrome c oxidase, is not capable of growing at light intensities below 5 micromol photons m(-2) s(-1), presumably due to an overreduced plastoquinone pool in the thylakoid membrane. Upon selection for growth at light intensities below 5 micromol photons m(-2) s(-1), a secondary mutant was generated that retained the CtaI deletion and had fully assembled photosystem II complexes; in this secondary mutant (pseudorevertant), oxygen evolution and respiratory activities were similar to those in the wild type.

Slr2013 is a novel protein regulating functional assembly of photosystem II in Synechocystis sp. strain PCC 6803.

The Synechocystis sp. strain PCC 6803, which has a T192H mutation in the D2 protein of photosystem II, is an obligate photoheterotroph due to the lack of assembled photosystem II complexes. A secondary mutant, Rg2, has been selected that retains the T192H mutation but is able to grow photoautotrophically.

Transformation of the cyanobacterium Synechocystis sp. PCC 6803 as a tool for genetic mapping: optimization of efficiency.

The cyanobacterium Synechocystis sp. PCC 6803 is transformable at high efficiency and integrates DNA by homologous double recombination. However, several genetic mapping procedures depend on the ability to generate transformants even with very small amounts of added DNA.