from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of numerous proteins or conjugated proteins produced by living organisms and functioning as biochemical catalysts.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A globular protein that catalyses a biological chemical reaction.
from the GNU version of the Collaborative International Dictionary of English
- n. A protein produced by a living organism, capable of catalyzing a chemical reaction. Almost all processes in living organisms require some form of enzyme to cause the reactions to occur at a rate sufficient to support life. There are a very wide variety of enzymes, each specifically catalyzing a different chemical reaction, the sum of which cause the bulk of the physiological changes observed as life processes. Enzymes, like most proteins, are synthesized by the protein-synthetic mechanism of the living cell, at special sites on ribosomes, using the genetic information in messenger RNA transcribed from the genetic instructions stored as nuleotide sequences in the DNA (or in some viruses, the RNA) of the genome. Some examples of enzymes are: pepsin, diastase, rennet, DNA polymerase, invertase, glucose oxidase, protease, and ribonuclease. There are many other types of enzyme.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions
I think residual bromelain enzyme from the piña breaks down the gluten in the wheat flour.
And scientists coined the word enzyme, denoting the remarkable protein molecules that living cells use to transform other molecules, from the Greek words for “in yeast,” where sugar is transformed into alcohol.
If that enzyme is blocked, levels of 17 hydroxyprogesterone build up, and then steroid production tends to preferentially head down the other path towards testosterone.
This enzyme is part of the adrenal production pathway for cortisol, and catalyzes the conversion of 17-hydroxyprogesterone to 11-deoxycortisol.
This enzyme is responsible for the majority of starch digestion.
This neurotoxic action kills bugs by reducing the level of a certain enzyme (acetylcholinesterase) that clears an important neurotransmitter chemical (acetylcholine) out of the junction between nerve cells.
With the introduction of thermodynamics, advances in enzyme chemistry and the discovery of phosphorylated compounds in the 1920s, the stage was set for a sudden shift in how scientists understood intermediate metabolism.
Long term enzyme-replacement therapy for people with Pompe disease, an inherited muscle disorder affecting fewer than 10,000 people world-wide. —
It could be that the enzyme is simply not capable of doing more, or it could be that the mutational trajectory needed to acquire additional function is prohibitively long and/or complex.
I was told design cannot explain why a glycolytic enzyme is part of the degradosome.