Crystal Structure Of Photosystem I: A Photosynthetic Reaction Center and Core Antenna System From Cyanobacteria: Reenergizing Those Electrons!

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For more information see Biochemistry Online: Chapter 8D - Photosynthesis: The Light Reaction

Protein Backbone
Cartoon with hydrogen bonds

Photosystem I utilizes sulfur clusters as electrons are literally passed through Photosystem I in bioenergetic chemical reactions. As can be seen, several sulfur clusters are present throughout Photosystem I.

Photosystem I Sulfur Clusters

In cyanobacteria, phycocyaninbilin (CYC) is a blue accessory pigment attached to photosynthetic membranes, utilized in photosynthesis. It accounts for up to 20% of proteins in cyanobacteria.

Photosystem I- CYC Interactions