Antioxidants are compounds that inhibit oxidation, a chemical reaction that can produce free radicals. This can lead to polymerization and other chain reactions. They are frequently added to industrial products, such as fuels and lubricants, to prevent oxidation, and to foods to prevent spoilage, in particular the rancidification of oils and fats. In cells, antioxidants such as glutathione, mycothiol or bacillithiol, and enzyme systems like superoxide dismutase, can prevent damage from oxidative stress.
In biochemistry, a disulfide refers to a functional group with the structure R−S−S−R′. The linkage is also called an SS-bond or sometimes a disulfide bridge and is usually derived by the coupling of two thiol groups. In biology, disulfide bridges formed between thiol groups in two cysteine residues are an important component of the secondary and tertiary structure of proteins. Persulfide usually refers to R−S−S−H compounds.
Protein disulfide isomerase, or PDI, is an enzyme in the endoplasmic reticulum (ER) in eukaryotes and the periplasm of bacteria that catalyzes the formation and breakage of disulfide bonds between cysteine residues within proteins as they fold. This allows proteins to quickly find the correct arrangement of disulfide bonds in their fully folded state, and therefore the enzyme acts to catalyze protein folding.
Thioredoxin is a class of small redox proteins known to be present in all organisms. It plays a role in many important biological processes, including redox signaling. In humans, thioredoxins are encoded by TXN and TXN2 genes. Loss-of-function mutation of either of the two human thioredoxin genes is lethal at the four-cell stage of the developing embryo. Although not entirely understood, thioredoxin is linked to medicine through their response to reactive oxygen species (ROS). In plants, thioredoxins regulate a spectrum of critical functions, ranging from photosynthesis to growth, flowering and the development and germination of seeds. Thioredoxins play a role in cell-to-cell communication.
Chemical biology is a scientific discipline spanning the fields of chemistry and biology. The discipline involves the application of chemical techniques, analysis, and often small molecules produced through synthetic chemistry, to the study and manipulation of biological systems. In contrast to biochemistry, which involves the study of the chemistry of biomolecules and regulation of biochemical pathways within and between cells, chemical biology deals with chemistry applied to biology.
Benjamin Franklin Cravatt III is a professor in the Department of Chemistry at The Scripps Research Institute in La Jolla, California. Considered a co-inventor of activity based proteomics and a substantial contributor to research on the endocannabinoid system, he is a prominent figure in the nascent field of chemical biology. Cravatt was elected to the National Academy of Sciences in 2014, and the American Academy of Arts and Sciences in 2016. He is Gilula Chair of Chemical Biology, a Cope Scholar, and a Searle Scholar.
Lubert Stryer is the Emeritus Mrs. George A. Winzer Professor of Cell Biology, at Stanford University School of Medicine. His research over more than four decades has been centered on the interplay of light and life. In 2007 he received the National Medal of Science from President Bush at a ceremony at the White House for elucidating the biochemical basis of signal amplification in vision, pioneering the development of high density microarrays for genetic analysis, and authoring the standard undergraduate biochemistry textbook, Biochemistry. It is now in its ninth edition and also edited by Jeremy Berg, John L. Tymoczko and Gregory J. Gatto, Jr.
In organic chemistry, S-nitrosothiols, also known as thionitrites, are organic compounds or functional groups containing a nitroso group attached to the sulfur atom of a thiol. S-Nitrosothiols have the general formula R−S−N=O, where R denotes an organic group. Originally suggested by Ignarro to serve as intermediates in the action of organic nitrates, endogenous S-nitrosothiols were discovered by Stamler and colleagues and shown to represent a main source of NO bioactivity in vivo. More recently, S-nitrosothiols have been implicated as primary mediators of protein S-nitrosylation, the oxidative modification of cysteine thiol that provides ubiquitous regulation of protein function.
The reduction-oxidation sensitive green fluorescent protein (roGFP) is a green fluorescent protein engineered to be sensitive to changes in the local redox environment. roGFPs are used as redox-sensitive biosensors.
Peter Leslie Dutton FRS is a British biochemist, and Eldridge Reeves Johnson Professor of Biochemistry and Biophysics in the Perelman School of Medicine at the University of Pennsylvania. He is a 2013 recipient of the John Scott Award for his work on electron transfer, studying the organization of electrons in cells and the mechanisms by which they convert light or oxygen into energy for the cell.
Judith P. Klinman is an American chemist, biochemist, and molecular biologist known for her work on enzyme catalysis. She became the first female professor in the physical sciences at the University of California, Berkeley in 1978, where she is now Professor of the Graduate School and Chancellor's Professor. In 2012, she was awarded the National Medal of Science by President Barack Obama. She is a member of the National Academy of Sciences, American Academy of Arts and Sciences, American Association for the Advancement of Science, and the American Philosophical Society.
Ruma Banerjee is a professor of enzymology and biological chemistry at the University of Michigan Medical School. She is an experimentalist whose research has focused on unusual cofactors in enzymology.
Yang Dan is a Hong Kong-Chinese chemist and chemical biologist. She is the Chair Professor of Chemistry and the Morningside Professor in Chemical Biology at the University of Hong Kong. She was awarded the TWAS Prize for Chemistry in 2010 and the Young Woman Scientist Prize of China in 2011.
Helen Jane Dyson is a British-born biophysicist and a professor of integrative structural and computational biology at the Scripps Research Institute in La Jolla, California. She is also currently editor-in-chief of the Biophysical Journal. She was elected a member of the National Academy of Sciences in 2022.
Jin Zhang is a Chinese-American biochemist. She is a professor of pharmacology, chemistry and biochemistry, and biomedical engineering at the University of California, San Diego.
Katherine J. Franz is the Chair of the Department Chemistry at Duke University. She studies metal ion coordination in biological systems and looks to use the insight to manage species such as copper and iron. Franz was awarded the American Chemical Society Award for Encouraging Women into Careers in the Chemical Sciences.
Alexandra C. Newton is Distinguished Professor of pharmacology at the University of California, San Diego. Newton runs a multidisciplinary Protein kinase C and Cell signaling biochemistry and cell biology research group in the School of Medicine, investigating molecular mechanisms of signal transduction in the Phospholipase C (PLC) and Phosphoinositide 3-kinase signaling pathways. She has been continuously funded by the US National Institutes of Health since 1988.
Li Zhang is a biologist currently working at University of Texas at Dallas. She is a professor of Biological Sciences and the Cecil H. and Ida Green Distinguished Chair in Systems Biology Science at University of Texas at Dallas. During her 20+ years of independent research, Li Zhang has made major contributions to understanding of heme signaling and function in gene regulation, neuronal differentiation and survival, and lung cancer bioenergetics.
Sandra J. F. Degen is an American biochemist, molecular geneticist and Professor Emerita at the University of Cincinnati Children's Hospital Medical Center in the Department of Pediatrics. Degen was a professor at the University of Cincinnati for over thirty years, where she led a research program focused on probing the biology underlying blood coagulation, growth factors, and growth control. Her lab discovered a novel growth factor called hepatocyte growth factor-like protein. Degen is a member of several national societies and is an elected Fellow of the American Association for the Advancement of Science (AAAS).
George Stark is an American chemist and biochemist. His research interests include protein and enzyme function and modification, interferons and cytokines, signal transduction, and gene expression.
