Molecular basis of vision revealed

Researchers have solved the three-dimensional structure of a protein complex involved in vertebrate vision at atomic resolution, a finding that has broad implications for our understanding of biological signaling processes and the design of over a third of the drugs on the market today.

The findings illuminate how signals from photons (particles of light) get amplified in the eye. More importantly, the study provides insights into how the largest family of cell membrane proteins -- G-protein-coupled receptors (GPCRs) -- work in humans.

They're involved in almost all the biological processes in a human body -- how we perceive light, taste, smell, or how the heart rate is regulated or muscles contract -- and they are targets for over 30% of the drugs that are used today.

There are over 800 GPCRs in humans that signal through about 20 different G proteins. GPCRs are responsible for sensing a wide range of outside signals -- such as hormones, light, and sense of smell and taste -- and inducing corresponding responses inside the cell. In vertebrate vision, the GPCR rhodopsin is capable of detecting the signal from just one photon and through the activation of the G protein transducing and downstream effectors, amplify it 100,000 times.

The researchers used cryo-electron microscopy to obtain atomic-resolution structures of the rhodopsin-transducing complex. The structures not only provide the molecular basis of vertebrate vision, but also reveal a previously unknown mechanism of how GPCRs in general activate G proteins.

By learning more about how different receptors specifically couple with different G proteins, the researchers hope to gain insights into designing drugs that specifically regulate GPCR signaling.