Photosystem I

Definition

Photosystem I is a multi-subunit protein complex embedded within the thylakoid membrane of chloroplasts, and the second protein complex involved in the light-dependent reactions of photosynthesis. The protein complex uses light energy to drive the transfer of electrons across the thylakoid membrane, and the reduction of NADP to NADPH.

Latest Research and Reviews

News and Comment

  • News and Views |

    The core of the photosynthetic complex photosystem I had been assumed to require contact with its associated light-harvesting complex I to function. But a mutant Arabidopsis line lacking the components of this complex shows that a plant's photosynthetic apparatus is more adaptable to changes in its environment than previously thought.

    • Dario Leister
    Nature Plants 2, 16135