7TM receptors

Bacteriorhodopsin (Bop) is a protein used by Archaea, most notably by Haloarchaea, a class of the Euryarchaeota. It acts as a proton pump; that is, it captures light energy and uses it to move protons across the membrane out of the cell. The resulting proton gradient is subsequently converted into chemical energy.

Smoothened is a protein that in humans is encoded by the SMO gene. Smoothened is a Class Frizzled (Class F) G protein-coupled receptor that is a component of the hedgehog signaling pathway and is conserved from flies to humans. It is the molecular target of the natural teratogen cyclopamine. It also is the target of vismodegib, the first hedgehog pathway inhibitor to be approved by the U.S. Food and Drug Administration (FDA).

Halorhodopsin is a seven-transmembrane retinylidene protein from microbial rhodopsin family. It is a chloride-specific light-activated ion pump found in archaea known as halobacteria. It is activated by green light wavelengths of approximately 578 nm. Halorhodopsin also shares sequence similarity to channelrhodopsin, a light-gated ion channel.

Membrane progesterone receptor delta (mPRδ), or progestin and adipoQ receptor 6 (PAQR6), is a protein that in humans is encoded by the PAQR6 gene.

Membrane progesterone receptor alpha (mPRα), or progestin and adipoQ receptor 7 (PAQR7), is a protein that in humans is encoded by the PAQR7 gene.

Membrane progesterone receptor gamma (mPRγ), or progestin and adipoQ receptor 5 (PAQR5), is a protein that in humans is encoded by the PAQR5 gene.

Membrane progesterone receptor beta (mPRβ), or progestin and adipoQ receptor 8 (PAQR8), is a protein that in humans is encoded by the PAQR8 gene.

Membrane progesterone receptor epsilon (mPRɛ), or progestin and adipoQ receptor 9 (PAQR9), is a protein that in humans is encoded by the PAQR9 gene.