Ultrafast structural changes within a photosynthetic reaction centre.
Nature
; 589(7841): 310-314, 2021 01.
Article
em En
| MEDLINE
| ID: mdl-33268896
Photosynthetic reaction centres harvest the energy content of sunlight by transporting electrons across an energy-transducing biological membrane. Here we use time-resolved serial femtosecond crystallography1 using an X-ray free-electron laser2 to observe light-induced structural changes in the photosynthetic reaction centre of Blastochloris viridis on a timescale of picoseconds. Structural perturbations first occur at the special pair of chlorophyll molecules of the photosynthetic reaction centre that are photo-oxidized by light. Electron transfer to the menaquinone acceptor on the opposite side of the membrane induces a movement of this cofactor together with lower amplitude protein rearrangements. These observations reveal how proteins use conformational dynamics to stabilize the charge-separation steps of electron-transfer reactions.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Complexo de Proteínas do Centro de Reação Fotossintética
Idioma:
En
Revista:
Nature
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Suécia