| enzyme | | |
| n. (substance) | 1. enzyme | any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions. |
| ~ active site | the part of an enzyme or antibody where the chemical reaction occurs. |
| ~ ada, adenosine deaminase | an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia.; "ADA deficiency can lead to one form of severe combined immunodeficiency disease"; "the gene encoding ADA was one of the earlier human genes to be isolated and cloned for study" |
| ~ catalyst, accelerator | (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected. |
| ~ protein | any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes.; "a diet high in protein" |
| ~ amylase | any of a group of proteins found in saliva and pancreatic juice and parts of plants; help convert starch to sugar. |
| ~ cholinesterase | an enzyme that hydrolyses acetylcholine (into choline and acetic acid). |
| ~ coagulase | an enzyme that induces coagulation. |
| ~ collagenase | any enzyme that catalyzes the hydrolysis of collagen and gelatin. |
| ~ complement | one of a series of enzymes in the blood serum that are part of the immune response. |
| ~ catalase | enzyme found in most plant and animal cells that functions as an oxidative catalyst; decomposes hydrogen peroxide into oxygen and water. |
| ~ cox, cyclooxygenase | either of two related enzymes that control the production of prostaglandins and are blocked by aspirin. |
| ~ decarboxylase | any of the enzymes that hydrolize the carboxyl group. |
| ~ de-iodinase | an enzyme that removes the iodine radical. |
| ~ disaccharidase | an enzyme that catalyzes the hydrolysis of disaccharides into monosaccharides. |
| ~ elastase | a pancreatic enzyme that catalyzes the hydrolysis of elastin. |
| ~ enterokinase | enzyme in the intestinal juice that converts inactive trypsinogen into active trypsin. |
| ~ histaminase | enzyme that acts as a catalyst in converting histidine to histamine. |
| ~ hyaluronidase, hyazyme, spreading factor | an enzyme (trade name Hyazyme) that splits hyaluronic acid and so lowers its viscosity and increases the permeability of connective tissue and the absorption of fluids. |
| ~ isomerase | an enzyme that catalyzes its substrate to an isomeric form. |
| ~ kinase | an enzyme that catalyzes the conversion of a proenzyme to an active enzyme. |
| ~ lipase | an enzyme secreted in the digestive tract that catalyzes the breakdown of fats into individual fatty acids that can be absorbed into the bloodstream. |
| ~ lysozyme, muramidase | an enzyme found in saliva and sweat and tears that destroys the cell walls of certain bacteria. |
| ~ mao, monoamine oxidase | an enzyme that catalyzes the oxidation of many body compounds (e.g., epinephrine and norepinephrine and serotonin). |
| ~ nitrogenase | an enzyme of nitrogen-fixing microorganisms that catalyzes the conversion of nitrogen to ammonia. |
| ~ nuclease | general term for enzymes that catalyze the hydrolysis of nucleic acid by cleaving chains of nucleotides into smaller units. |
| ~ oxidase | any of the enzymes that catalyze biological oxidation. |
| ~ oxidoreductase | an enzyme that catalyzes oxidation-reduction. |
| ~ papain | a proteolytic enzyme obtained from the unripe papaya; used as a meat tenderizer. |
| ~ beta-lactamase, penicillinase | enzyme produced by certain bacteria that inactivates penicillin and results in resistance to that antibiotic. |
| ~ pepsin | an enzyme produced in the stomach that splits proteins into peptones. |
| ~ pepsinogen | precursor of pepsin; stored in the stomach walls and converted to pepsin by hydrochloric acid in the stomach. |
| ~ phosphatase | any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates. |
| ~ fibrinolysin, plasmin | an enzyme that dissolves the fibrin of blood clots. |
| ~ polymerase | an enzyme that catalyzes the formation of new DNA and RNA from an existing strand of DNA or RNA. |
| ~ peptidase, protease, proteinase, proteolytic enzyme | any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis. |
| ~ reductase | an enzyme that catalyses the biochemical reduction of some specified substance. |
| ~ chymosin, rennin | an enzyme that occurs in gastric juice; causes milk to coagulate. |
| ~ secretase | a set of enzymes believed to snip pieces off a longer protein producing fragments of amyloid protein that bunch up and create amyloid protein plaques in brain tissue (the pathological hallmark of Alzheimer's). |
| ~ streptodornase | an enzyme produced by some hemolytic strains of streptococcus that dissolves fibrinous secretions from infections; used medicinally (often in combination with streptokinase). |
| ~ streptokinase | an enzyme produced by some strains of streptococcus that can liquefy blood clots by converting plasminogen to plasmin; used medicinally in some cases of myocardial infarction and pulmonary embolism. |
| ~ superoxide dismutase, sod | an enzyme that catalyzes the conversion of superoxide into hydrogen peroxide and oxygen.; "oxygen free radicals are normally removed in our bodies by the superoxide dismutase enzymes" |
| ~ telomerase | an enzyme in eukaryotic cells that can add telomeres to the ends of chromosomes after they divide. |
| ~ transferase | any of various enzymes that move a chemical group from one compound to another compound. |
| ~ trypsin | an enzyme of pancreatic origin; catalyzes the hydrolysis of proteins to smaller polypeptide units. |
| ~ urease | an enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia; is present in intestinal bacteria. |
| ~ zymase | a complex of enzymes that cause glycolysis; originally found in yeast but also present in higher organisms. |
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