Charge transfer states in phycobilisomes.
Biochim Biophys Acta Bioenerg
; 1861(7): 148187, 2020 07 01.
Article
em En
| MEDLINE
| ID: mdl-32173383
ABSTRACT
Phycobilisomes (PBs) absorb light and supply downstream photosynthetic processes with excitation energy in many cyanobacteria and algae. In response to a sudden increase in light intensity, excess excitation energy is photoprotectively dissipated in PBs by means of the orange carotenoid protein (OCP)-related mechanism or via a light-activated intrinsic decay channel. Recently, we have identified that both mechanisms are associated with far-red emission states. Here, we investigate the far-red states involved with the light-induced intrinsic mechanism by exploring the energy landscape and electro-optical properties of the pigments in PBs. While Stark spectroscopy showed that the far-red states in PBs exhibit a strong charge-transfer (CT) character at cryogenic temperatures, single molecule spectroscopy revealed that CT states should also be present at room temperature. Owing to the strong environmental sensitivity of CT states, the knowledge gained from this study may contribute to the design of a new generation of fluorescence markers.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ficobilissomas
/
Transferência de Energia
Idioma:
En
Revista:
Biochim Biophys Acta Bioenerg
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Bangladesh