The necessity of studying extremophile organisms is exemplified by the structure of photosystem I from a high-light tolerant cyanobacteria, demonstrating the relationship between the structure and function in photosystem I.

The structure of the photosystem I (PSI) complex from Synechocystis is determined, and reaction center subunits engineered to resemble a viral PSI are found to promote promiscuous electron acceptor properties.

Cyanobacteria cope with both predictable day/night changes and natural fluctuations in light during the day by adjusting the expression dynamics of circadian-clock-controlled genes via a network of transcriptional regulators.

Genetic, biochemistry and modeling approaches reveal elements of a Turing-type reaction-diffusion system to control pattern formation in differentiating cyanobacterial filaments.

A potentially useful cyanobacterial sulfated exopolysaccharide and its biosynthesis and regulation genes, which contribute to the laboratorial bloom formation, are elucidated for the first time among prokaryotes.

Carboxysomes, the carbon-fixation machinery of cyanobacteria, are equidistantly-positioned by dynamic gradients of the protein McdA on the nucleoid that emerge through interaction with a previously unidentified carboxysome factor, McdB.

Cyanobacteria with chlorophyll f show substantial near-infrared radiation-driven photosynthesis and can play an important role for primary production in endolithic, intertidal habitats.

The self-buckling behavior of filamentous cyanobacteria allowed a quantification of their propulsion forces, indicating that adhesion plays an important role in gliding motility.

The cells of a cyanobacterium act as spherical micro-lenses, allowing the cell to see a light source and move towards it.

Primordial cyanobacterial PSI structure.