Initial Photophysical Characterization of the Proteorhodopsin Optical Proton Sensor (PROPS)

Frontiers in Neuroscience

Jay eNadeau¹ 

[1] California Institute of Technology;

关键词: Electrophysiology;    optical recording;    Genetically-encoded voltage sensors;    time-resolved fluorescence;    proteorhodopin;   

DOI  :  10.3389/fnins.2015.00315

来源: DOAJ

【 摘 要 】

Fluorescence is not frequently used as a tool for investigating the photocycles of rhodopsins, largely because of the low quantum yield of the retinal chromophore. However, a new class of genetically encoded voltage sensors is based upon rhodopsins and their fluorescence. The first such sensor reported in the literature was the proteorhodopsin optical proton sensor (PROPS), which is capable of indicating membrane voltage changes in bacteria by means of changes in fluorescence. However, the properties of this fluorescence, such as its lifetime decay components and its origin in the protein photocycle, remain unknown. This paper reports steady-state and nanoscale time-resolved emission of this protein expressed in two strains of Escherichia coli, before and after membrane depolarization. The voltage-dependence of a particularly long lifetime component is established. Additional work to improve quantum yields and improve the general utility of PROPS is suggested.

【 授权许可】

Unknown