Enzymes are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products. Almost all metabolic processes in the cell need enzyme catalysis in order to occur at rates fast enough to sustain life. Metabolic pathways depend upon enzymes to catalyze individual steps. The study of enzymes is called enzymology and the field of pseudoenzyme analysis recognizes that during evolution, some enzymes have lost the ability to carry out biological catalysis, which is often reflected in their amino acid sequences and unusual 'pseudocatalytic' properties.
In biochemistry and molecular biology, a binding site is a region on a macromolecule such as a protein that binds to another molecule with specificity. The binding partner of the macromolecule is often referred to as a ligand. Ligands may include other proteins, enzyme substrates, second messengers, hormones, or allosteric modulators. The binding event is often, but not always, accompanied by a conformational change that alters the protein's function. Binding to protein binding sites is most often reversible, but can also be covalent reversible or irreversible.
Molecular motors are natural (biological) or artificial molecular machines that are the essential agents of movement in living organisms. In general terms, a motor is a device that consumes energy in one form and converts it into motion or mechanical work; for example, many protein-based molecular motors harness the chemical free energy released by the hydrolysis of ATP in order to perform mechanical work. In terms of energetic efficiency, this type of motor can be superior to currently available man-made motors. One important difference between molecular motors and macroscopic motors is that molecular motors operate in the thermal bath, an environment in which the fluctuations due to thermal noise are significant.
Enzyme kinetics is the study of the rates of enzyme-catalysed chemical reactions. In enzyme kinetics, the reaction rate is measured and the effects of varying the conditions of the reaction are investigated. Studying an enzyme's kinetics in this way can reveal the catalytic mechanism of this enzyme, its role in metabolism, how its activity is controlled, and how a drug or a modifier might affect the rate.
Robert Arnold Alberty (1921–2014) was an American biophysical chemist, professor emeritus at the Massachusetts Institute of Technology, and a member of the National Academy of Sciences.
Frank Henry Westheimer was an American chemist. He taught at the University of Chicago from 1936 to 1954, and at Harvard University from 1953 to 1983, becoming the Morris Loeb Professor of Chemistry in 1960, and Professor Emeritus in 1983. The Westheimer medal was established in his honor in 2002.
Enzyme catalysis is the increase in the rate of a process by a biological molecule, an "enzyme". Most enzymes are proteins, and most such processes are chemical reactions. Within the enzyme, generally catalysis occurs at a localized site, called the active site.
Ronald T. Raines is an American chemical biologist. He is the Roger and Georges Firmenich Professor of Natural Products Chemistry at the Massachusetts Institute of Technology. He is known for using ideas and methods of physical organic chemistry to solve important problems in biology.
William Wallace Cleland (January 6, 1930 – March 6, 2013, often cited as W. W. Cleland, and known almost universally as "Mo Cleland", was a University of Wisconsin-Madison biochemistry professor. His research was concerned with enzyme reaction mechanism and enzyme kinetics, especially multiple-substrate enzymes. He was elected to the National Academy of Sciences in 1985.
Myron Lee Bender (1924–1988) was born in St. Louis, Missouri. He obtained his B.S. (1944) and his Ph.D. (1948) from Purdue University. The latter was under the direction of Henry B. Hass. After postdoctoral research under Paul D. Barlett, and Frank H. Westheimer, he spent one year as a faculty member at the University of Connecticut. Thereafter, he was a professor of Chemistry at Illinois Institute of Technology in 1951, and then at Northwestern University in 1960. He worked primarily in the study of reaction mechanisms and the biochemistry of enzyme action. Myron L. Bender demonstrated the two-step mechanism of catalysis for serine proteases, nucleophilic catalysis in ester hydrolysis and intramolecular catalysis in water. He also showed that cyclodextrin can be used to investigate catalysis of organic reactions within the scope of host–guest chemistry. Finally, he and others reported on the synthesis of an organic compound as a model of an acylchymotrypsin intermediate.
A diffusion-limited enzyme catalyses a reaction so efficiently that the rate limiting step is that of substrate diffusion into the active site, or product diffusion out. This is also known as kinetic perfection or catalytic perfection. Since the rate of catalysis of such enzymes is set by the diffusion-controlled reaction, it therefore represents an intrinsic, physical constraint on evolution. Diffusion limited perfect enzymes are very rare. Most enzymes catalyse their reactions to a rate that is 1,000-10,000 times slower than this limit. This is due to both the chemical limitations of difficult reactions, and the evolutionary limitations that such high reaction rates do not confer any extra fitness.
Jeremy Randall Knowles was a professor of chemistry at Harvard University who served as dean of the Harvard University faculty of arts and sciences (FAS) from 1991 to 2002. He joined Harvard in 1974, received many awards for his research, and remained at Harvard until his death, leaving the faculty for a decade to serve as Dean. Knowles died on 3 April 2008 at his home.
Stephen James Benkovic is an American chemist known for his contributions to the field of enzymology. He holds the Evan Pugh University Professorship and Eberly Chair in Chemistry at The Pennsylvania State University. He has developed boron compounds that are active pharmacophores against a variety of diseases. Benkovic has concentrated on the assembly and kinetic attributes of the enzymatic machinery that performs DNA replication, DNA repair, and purine biosynthesis.
Thomas C. Bruice was a professor of chemistry and biochemistry at University of California, Santa Barbara. He was elected to the National Academy of Sciences in 1974. He was a pioneering researcher in the area of chemical biology, and is one of the 50 most cited chemists.
Sharon Hammes-Schiffer is a physical chemist who has contributed to theoretical and computational chemistry. She is currently a Sterling Professor of Chemistry at Yale University. She has served as senior editor and deputy editor of the Journal of Physical Chemistry and advisory editor for Theoretical Chemistry Accounts. As of 1 January 2015 she is editor-in-chief of Chemical Reviews.
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.
Nils G. Walter, Dr. Ing., is the Francis S. Collins Collegiate Professor of Chemistry, Biophysics, and Biological Chemistry at the University of Michigan, Ann Arbor. Research in the Nils Walter Lab focuses on non-coding RNA through the lens of single molecule techniques. He is the Founding Director of the Single Molecule Analysis in real-Time (SMART) Center at Michigan. In addition, Walter is the Founding Co-Director for the University of Michigan Center for RNA Biomedicine whose mission is to enrich the university’s intellectual and training environment around RNA Biomedicine. He is currently an Associate Director for the Michigan Post-baccalaureate Research Education Program (PREP).
Athel Cornish-Bowden is a British biochemist known for his numerous textbooks, particularly those on enzyme kinetics and his work on metabolic control analysis.
Gabriela S. Schlau-Cohen is a Thomas D. and Virginia W. Cabot Career Development Associate Professor at MIT in the Department of Chemistry.
John P. Richard is a chemist and academic. He is a SUNY Distinguished Professor at the University at Buffalo.
