G protein-coupled receptors (GPCRs), also known as seven-(pass)-transmembrane domain receptors, 7TM receptors, heptahelical receptors, serpentine receptors, and G protein-linked receptors (GPLR), form a large group of evolutionarily related proteins that are cell surface receptors that detect molecules outside the cell and activate cellular responses. They are coupled with G proteins. They pass through the cell membrane seven times in the form of six loops of amino acid residues, which is why they are sometimes referred to as seven-transmembrane receptors. Ligands can bind either to the extracellular N-terminus and loops or to the binding site within transmembrane helices. They are all activated by agonists, although a spontaneous auto-activation of an empty receptor has also been observed.
Transducin (Gt) is a protein naturally expressed in vertebrate retina rods and cones and it is very important in vertebrate phototransduction. It is a type of heterotrimeric G-protein with different α subunits in rod and cone photoreceptors.
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.
The term viral protein refers to both the products of the genome of a virus and any host proteins incorporated into the viral particle. Viral proteins are grouped according to their functions, and groups of viral proteins include structural proteins, nonstructural proteins, regulatory proteins, and accessory proteins. Viruses are non-living and do not have the means to reproduce on their own, instead depending on their host cell's machinery to do this. Thus, viruses do not code for most of the proteins required for their replication and the translation of their mRNA into viral proteins, but use proteins encoded by the host cell for this purpose.
Gp41 also known as glycoprotein 41 is a subunit of the envelope protein complex of retroviruses, including human immunodeficiency virus (HIV). Gp41 is a transmembrane protein that contains several sites within its ectodomain that are required for infection of host cells. As a result of its importance in host cell infection, it has also received much attention as a potential target for HIV vaccines.
Arrestins are a small family of proteins important for regulating signal transduction at G protein-coupled receptors. Arrestins were first discovered as a part of a conserved two-step mechanism for regulating the activity of G protein-coupled receptors (GPCRs) in the visual rhodopsin system by Hermann Kühn, Scott Hall, and Ursula Wilden and in the β-adrenergic system by Martin J. Lohse and co-workers.
Rhodopsin kinase is a serine/threonine-specific protein kinase involved in phototransduction. This enzyme catalyses the following chemical reaction:
Xiaowei Zhuang is a Chinese-American biophysicist who is the David B. Arnold Jr. Professor of Science, Professor of Chemistry and Chemical Biology, and Professor of Physics at Harvard University, and an Investigator at the Howard Hughes Medical Institute. She is best known for her work in the development of Stochastic Optical Reconstruction Microscopy (STORM), a super-resolution fluorescence microscopy method, and the discoveries of novel cellular structures using STORM. She received a 2019 Breakthrough Prize in Life Sciences for developing super-resolution imaging techniques that get past the diffraction limits of traditional light microscopes, allowing scientists to visualize small structures within living cells. She was elected a Member of the American Philosophical Society in 2019 and was awarded a Vilcek Foundation Prize in Biomedical Science in 2020.
Margaret Scott Robinson is a British molecular cell biologist, a professor and researcher in the Cambridge Institute for Medical Research, at the University of Cambridge.
Microbial rhodopsins, also known as bacterial rhodopsins, are retinal-binding proteins that provide light-dependent ion transport and sensory functions in halophilic and other bacteria. They are integral membrane proteins with seven transmembrane helices, the last of which contains the attachment point for retinal. Most microbial rhodopsins pump inwards, however "mirror rhodopsins" which function outwards. have been discovered.
Lidia Mannuzzu was an Italian biologist, physiologist and academic.
Archaerhodopsin proteins are a family of retinal-containing photoreceptors found in the archaea genera Halobacterium and Halorubrum. Like the homologous bacteriorhodopsin (bR) protein, archaerhodopsins harvest energy from sunlight to pump H+ ions out of the cell, establishing a proton motive force that is used for ATP synthesis. They have some structural similarities to the mammalian G protein-coupled receptor protein rhodopsin, but are not true homologs.
Mei Hong is a Chinese-American biophysical chemist and professor of chemistry at the Massachusetts Institute of Technology. She is known for her creative development and application of solid-state nuclear magnetic resonance (ssNMR) spectroscopy to elucidate the structures and mechanisms of membrane proteins, plant cell walls, and amyloid proteins. She has received a number of recognitions for her work, including the American Chemical Society Nakanishi Prize in 2021, Günther Laukien Prize in 2014, the Protein Society Young Investigator award in 2012, and the American Chemical Society’s Pure Chemistry award in 2003.
Barbara Imperiali is a Professor of Biology and Chemistry at Massachusetts Institute of Technology and Affiliate Member of the Broad Institute. She is an elected member of the National Academy of Sciences and a Fellow of the Royal Society of Chemistry.
Karin Musier-Forsyth, an American biochemist, is an Ohio Eminent Scholar on the faculty of the Department of Chemistry & Biochemistry at Ohio State University. Musier-Forsyth's research involves biochemical, biophysical and cell-based approaches to understand the interactions of proteins and RNAs involved in protein synthesis and viral replication, especially in HIV.
Amy Hamilton Andreotti is an American biochemist who is the Roy J. Carver Chair and University Professor of Biochemistry, Biophysics, and Molecular Biology at Iowa State University. Her research considers TEC kinases including Bruton's Tyrosine Kinase (BTK) and IL-2 Inducible T-cell Kinase (ITK).
Carla M. Koehler is an American biochemist who is a professor at the University of California, Los Angeles. Her research considers mitochondria and the processes which import proteins to their appropriate locations in the organelles. She was elected Fellow of the American Association for the Advancement of Science in 2018.
Paola Picotti is an Italian biochemist who is Professor for Molecular Systems Biology at ETH Zürich. She is Deputy Head of the Institute for Molecular Systems Biology. Her research investigates how the conformational changes of proteins impact molecular networks with cells. She received numerous awarded awards, among which the 2019 EMBO Gold Medal.
Kathryn Ann Whitehead is an American chemical engineer who is a professor at Carnegie Mellon University. Her research considers the development of nanomaterial-based drug delivery systems for gene therapy, oral macromolecular delivery systems, and maternal and infant therapeutics. She is an elected Fellow of the American Institute for Medical and Biological Engineering in 2021 and Fellow of the Controlled Release Society.
Giulia Zanetti is a British Italian biologist who is Professor of Molecular Biology at the Francis Crick Institute. She develops advanced imaging techniques to understand membrane transport pathways. She was awarded the 2021 Biochemical Society Colworth Medal.
