期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 116, 期 26, 页码 12627-12628出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1900481116
关键词
rhodopsin; metarhodopsin II; vertebrates; evolution
资金
- National Natural Science Foundation of China [31601855, 31570382]
- European Research Council Starting grant [310482]
- European Research Council (ERC) [310482] Funding Source: European Research Council (ERC)
The ability of vertebrates to occupy diverse niches has been linked to the spectral properties of rhodopsin, conferring rod-based vision in low-light conditions. More recent insights have come from nonspectral kinetics, including the retinal release rate of the active state of rhodopsin, a key aspect of scotopic vision that shows strong associations with light environments in diverse taxa. We examined the retinal release rates in resurrected proteins across early vertebrates and show that the earliest forms were characterized by much faster rates of retinal release than more recent ancestors. We also show that scotopic vision at the origin of tetrapods is a derived state that arose via at least 4 major shifts in retinal release rate. Our results suggest that early rhodopsin had a function intermediate to that of modern rod and cone pigments and that its well-developed adaptation to low light is a relatively recent innovation since the origin of tetrapods.
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