Photosystem II

Definition

Photosystem II is a multi-subunit protein embedded within the thylakoid membrane of chloroplasts, and the first protein complex involved in the light-dependent reactions of photosynthesis. The protein complex uses light energy to oxidise two molecules of water to molecular oxygen, liberating four electrons and four hydrogen ions in the process.

Latest Research and Reviews

News and Comment

  • Correspondence |

    • Nicholas K. Sauter
    • , Nathaniel Echols
    • , Paul D. Adams
    • , Petrus H. Zwart
    • , Jan Kern
    • , Aaron S. Brewster
    • , Sergey Koroidov
    • , Roberto Alonso-Mori
    • , Athina Zouni
    • , Johannes Messinger
    • , Uwe Bergmann
    • , Junko Yano
    •  & Vittal K. Yachandra
    Nature 533, E1–E2
  • News and Views |

    Detection of coherent energy transport has fuelled claims that quantum effects make photosynthesis more efficient. Experiments now show that the interplay between electronic and vibrational motion also sustains coherence in the subsequent charge-separation process.

    • Susana F. Huelga
    •  & Martin B. Plenio
    Nature Physics 10, 621–622
  • News and Views |

    The oxygen-evolving centre in the protein complex photosystem II involves Ca2+ within a high-valent oxomanganese cluster, but the role of Ca2+ has yet to be clarified. Interestingly, the electron-transfer behaviour of a non-haem oxoiron(IV) complex has now been found to be significantly altered by Lewis acid metal-ion binding to the oxo atom.

    • Kenneth D. Karlin
    Nature Chemistry 2, 711–712