Phosphatidylinositol consists of a family of lipids made of a phosphate group, two fatty acid chains, and one inositol molecule. They represent a class of the phosphatidylglycerides. Typically phosphatidylinositols form a minor component on the cytosolic side of eukaryotic cell membranes. The phosphate group gives the molecules a negative charge at physiological pH.
Sir John Ernest Walker is a British chemist who won the Nobel Prize in Chemistry in 1997. As of 2015 Walker is Emeritus Director and Professor at the MRC Mitochondrial Biology Unit in Cambridge, and a Fellow of Sidney Sussex College, Cambridge.
Phosphoinositide 3-kinases (PI3Ks), also called phosphatidylinositol 3-kinases, are a family of enzymes involved in cellular functions such as cell growth, proliferation, differentiation, motility, survival and intracellular trafficking, which in turn are involved in cancer.
Phosphatidylinositol 4,5-bisphosphate or PtdIns(4,5)P2, also known simply as PIP2 or PI(4,5)P2, is a minor phospholipid component of cell membranes. PtdIns(4,5)P2 is enriched at the plasma membrane where it is a substrate for a number of important signaling proteins. PIP2 also forms lipid clusters that sort proteins.
Phosphatidylinositol (3,4)-bisphosphate is a minor phospholipid component of cell membranes, yet an important second messenger. The generation of PtdIns(3,4)P2 at the plasma membrane activates a number of important cell signaling pathways.
Lipid signaling, broadly defined, refers to any biological signaling event involving a lipid messenger that binds a protein target, such as a receptor, kinase or phosphatase, which in turn mediate the effects of these lipids on specific cellular responses. Lipid signaling is thought to be qualitatively different from other classical signaling paradigms because lipids can freely diffuse through membranes. One consequence of this is that lipid messengers cannot be stored in vesicles prior to release and so are often biosynthesized "on demand" at their intended site of action. As such, many lipid signaling molecules cannot circulate freely in solution but, rather, exist bound to special carrier proteins in serum.
Richard Henderson is a British molecular biologist and biophysicist and pioneer in the field of electron microscopy of biological molecules. Henderson shared the Nobel Prize in Chemistry in 2017 with Jacques Dubochet and Joachim Frank.„Thanks to his work, we can look at individual atoms of living nature, thanks to cryo-electron microscopes we can see details without destroying samples, and for this he won the Nobel Prize in Chemistry."
John Kuriyan is the dean of basic sciences and a professor of biochemistry at Vanderbilt University School of Medicine. He was formerly the Chancellor's Professor at the University of California, Berkeley in the departments of molecular and cell biology (MCB) and chemistry, a faculty scientist in Berkeley Lab's physical biosciences division, and a Howard Hughes Medical Institute investigator. He is a member of the National Academy of Sciences and he has also been on the Life Sciences jury for the Infosys Prize in 2009, 2019 and 2020.
Phospholipase C (PLC) is a class of membrane-associated enzymes that cleave phospholipids just before the phosphate group (see figure). It is most commonly taken to be synonymous with the human forms of this enzyme, which play an important role in eukaryotic cell physiology, in particular signal transduction pathways. Phospholipase C's role in signal transduction is its cleavage of phosphatidylinositol 4,5-bisphosphate (PIP2) into diacyl glycerol (DAG) and inositol 1,4,5-trisphosphate (IP3), which serve as second messengers. Activators of each PLC vary, but typically include heterotrimeric G protein subunits, protein tyrosine kinases, small G proteins, Ca2+, and phospholipids.
David Julian Harry Downward FRS FMedSci is Associate Research Director at the Francis Crick Institute and Senior Group Leader at the Institute of Cancer Research. He was formerly head of the Signal transduction Laboratory at the London Research Institute. He is a member of the Editorial Board for Cell.
Leonard (Len) R Stephens FRS is a molecular biologist, senior group leader and associate director at the Babraham Institute.
Phillip (Phill) Thomas Hawkins FRS is a molecular biologist, senior group leader at the Babraham Institute.
David Chaim Rubinsztein FRS FMedSci is the Deputy Director of the Cambridge Institute of Medical Research (CIMR), Professor of Molecular Neurogenetics at the University of Cambridge and a UK Dementia Research Institute Professor.
Ramanujan Shankar Hegde is a group leader at the Medical Research Council (MRC) Laboratory of Molecular Biology (LMB).
Mark Andrew Lemmon an English-born biochemist, is the Alfred Gilman Professor and Department Chair of Pharmacology at Yale University where he also directs the Cancer Biology Institute.
Sir David Ian Stuart is a Medical Research Council Professor of Structural Biology at the Wellcome Trust Centre for Human Genetics at the University of Oxford where he is also a Fellow of Hertford College, Oxford. He is best known for his contributions to the X-ray crystallography of viruses, in particular for determining the structures of foot-and-mouth disease virus, bluetongue virus and the membrane-containing phages PRD1 and PM2. He is also director of Instruct and Life Sciences Director at Diamond Light Source.
(Edith) Yvonne Jones is director of the Cancer Research UK Receptor Structure Research Group at the University of Oxford and a Fellow of Jesus College, Oxford. She is widely known for her research on the molecular biology of cell surface receptors and signalling complexes.
Sir Richard Henry Treisman is a British scientist specialising in the molecular biology of cancer. Treisman is a director of research at the Francis Crick Institute in London.
Vincenzo Cerundolo was the Director of the Medical Research Council (MRC) Human Immunology Unit at the University of Oxford, at the John Radcliffe Hospital and a Professor of Immunology at the University of Oxford. He was also a Supernumerary Fellow at Merton College, Oxford. He was known for his discoveries in processing and presentation of cancer and viral peptides to T cells and lipids to invariant NKT cells. Cerundolo died of lung cancer on 7 January 2020.
Leonid A. Sazanov is a professor at the Institute of Science and Technology Austria (ISTA). Sazanov research explores the structure and function of large membrane protein complexes from the domain of bioenergetics. These molecular machines interconvert redox energy and proton motive force across biological membranes using a variety of mechanisms.
