Abstract 1188 Toward the structural basis of far-red light photoacclimation in Photosystem I of Fischerella thermalis PCC 7521

Photosynthesis is one of the most important biological processes on earth, responsible for the conversion of solar energy into useful chemical energy and the release of molecular oxygen as a byproduct for humans to breathe. Most organisms that perform oxygenic photosynthesis use chlorophyll (Chl) a to absorb light from 400 nm to 700 nm, the visible light spectrum. However, certain species of cyanobacteria adapt to shaded environments by additionally synthesizing Chls d or f, both of which absorb far-red light (FRL) (700 nm to 800 nm) to enrich the organism's absorbance cross section.