Enzymes are proteins that catalyze (i.e. accelerate) chemical reactions.[1] In enzymatic reactions, the molecules at the beginning of the process are called substrates, and the enzyme converts them into different molecules, the products.
Enzymes
Enzymes are catalysts. Most are proteins. (A few ribonucleoprotein enzymes have been discovered and, for some of these, the catalytic activity is in the RNA part rather than the protein part. Link to discussion of these ribozymes.) ...
enzyme
a protein that contains a catalytic site for a biochemical reaction
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
Enzyme is usually a protein molecule with a characteristic sequence of amino acids that fold to produce a specific three-dimensional structure, which gives the molecule unique properties.
an enzyme is a globular protein with an active site which bind to substrate molecules and helps to catalyse a reaction by holding melecules in the correct spatial conformation for the reaction to take place .
The covalent attachment of an enzyme to a solid matrix (like sepharose) so that it cannot move but still act on its substrate.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Enzyme
An enzyme is a biological catalyst and is almost always a protein. It speeds up the rate of a specific chemical reaction in the cell. The enzyme is not destroyed during the reaction and is used over and over.
Enzymes
What Are Enzymes?
Substances that speed up chemical reactions are called catalysts. Organic catalysts are called enzymes.
Enzymes can act rapidly, as in the case of carbonic anhydrase (enzymes typically end in the -ase suffix), which causes the chemicals to react 107 times faster than without the enzyme present.
enzymes form complexes with their substrates.
B.
enzymes lower the activation energy for chemical reactions.
Some enzymes make strand incisions immediately opposite one another, producing "blunt end" DNA fragments. Most enzymes make slightly staggered incisions, resulting in "sticky ends", out of which one strand protrudes.
Restriction enzymes in mapping
ReBase - restriction enzyme database
Restriction enzymes identify short DNA sequences ...
Restriction enzyme is a class of endonuclease that cut specific double-stranded DNA sequences.
Related
Endonuclease Restriction site ...
From Protein Folding to New Enzymes
Christopher M.Dobson1
Oxford Centre for Molecular Sciences, New Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QT, U.K.
An endonuclease that will recognize a specific target nucleotide sequence in DNA and break the DNA chain at the target; a variety of these enzymes are known, and they are extensively used in genetic engineering.
enzyme -- complex protein which helps to speed biochemical reactions. Enzymes are important in the construction and degradation of other molecules.
epicenter -- Point on the Earth's surface directly above the focus of an earthquake.
enzymes: Proteins that trigger activity in the cells of the body. An enzyme is not affected by the activity that it sets off.
ethical issues: Questions concerning what is moral or right.
Enzyme: A protein that acts as a catalyst, speeding the rate at which a biochemi cal reaction proceeds but not altering the direction or nature of the reaction.
enzymes Protein molecules that act as catalysts in biochemical reactions. PICTURE
eon The longest umit of geological time.
Enzyme A protein that speeds up a specific chemical reaction without being permanently altered or consumed.
enzyme
[Gk. en, in + zyme, leaven]
A class of proteins serving as catalysts, chemical agents that change the rate of a reaction without being consumed by the reaction.
epidermis ...
Enzymes. Proteins that control the various steps in all chemical reactions.
EPA. See Environmental Protection Agency.
Enzymes proteins that act as catalysts (cause other chemicals to react without being part of that chemical reaction)
(en = in; zym = yeast‚ leaven) ...
Enzyme
A protein that encourages a biochemical reaction, usually speeding it up. Organisms could not function if they didn't have enzymes. [Talking Glossary]
Ethical issues ...
Enzyme multiplicity A regulatory strategy in which the committed step common to several pathways is catalyzed by different enzymes with the same catalytic properties but different regulatory properties.
Coenzyme
From Wikipedia, the free encyclopedia
Jump to: navigation, search ...
Holoenzyme
A complex containing all of the subunits required for a functional enzyme. Used to describe enzymes composed of many different protein subunits.
Enzyme linked immunosorbent assay (ELISA)
A qualitative or quantitative immunological test for detecting specific molecules (eg antigens or antibodies), performed on a solid phase using a visible enzyme-chromogen reaction.
Enzyme
- A protein that accelerates the rate of chemical reactions. Enzymes are catalysts that promote reactions repeatedly, without being damaged by the reactions.
Episomes ...
Enzymes can put molecules together (synthesize) or break molecules apart (degrade)
The Role of Enzymes ...
enzymes - highly specific protein catalysts, they speed up the reactions by reducing the activation energy for a particular chemical change.
enzymes Molecules, usually proteins or nucleic acids, that act as catalysts in biochemical reactions.
enzyme-substrate complex The binding of a substrate molecule to the active site of an enzyme.
An enzyme (protein) that's part of the human immunodeficiency virus reads the sequence of viral RNA nucleic acids that have entered the host cell and transcribes the sequence into a complementary DNA sequence.
Alloenzyme (Allozyme)
An isoenzyme whose synthesis is controlled by codominant alleles of one gene.
Related Terms:
Isoenzyme (isozyme) ...
These enzymes which break down the nylon oligomers appear to have arisen by frameshift mutation from some other gene which codes for a functionally unrelated enzyme. This adaptation has been experimentally duplicated.
ELISA (enzyme-linked immunoabsorbant assay): An assay for quantifying the presence of an antigen by using an enzyme linked to an antibody to the antigen.
Restriction enzyme
A bacterially derived protein that recognizes specific, short nucleotide sequences and cuts DNA at those sites. Bacteria contain over 400 such enzymes that recognize and cut over 100 different DNA sequences.
inducible - enzyme not synthesized or activated until needed
nematodes - tiny worms; some are eaten by fungi
obligate - absolute requirement, e.g., obligate aerobe ...
Restriction enzyme: A class of enzymes ("restriction endonucleases") generally isolated from bacteria, which are able to recognize and cut specific sequences ("restriction sites") in DNA.
BIOTIN - A coenzyme which is essential for carboxylation reactions (see AVIDIN).
Permeases are enzymes that transport substances across the cell membrane, whether forward or outward the cell and they are highly specialized in their function. Besides, cell membranes operate as containers and as a protection for the cytoplasm.
Isoform Multiple molecular forms of a given protein (or iso enzymes or isozymes if they are enzymes). Isoforms can usually be separated by electrophoresis or some other separation technique.
catalase
An enzyme found in tissues, such as the liver, whose function is to catalyze the breakdown of toxic hydrogen peroxide into water and oxygen.
caudal
Relating to or in the position of the tail.
polymerase - enzyme that links together like units (monomers) into a polymer. For example, RNA polymerase synthesizes a polynucleotide chain using ribonucleotide monomers.
DPP4 is a very odd enzyme. It pokes out of your cells, so it's actually not inside the cell. Its purpose is to degrade the circulating hormones in your blood.
(See Initiation codon, Termination codon.) Coenzyme (cofactor). An organic molecule, such as a vitamin, that binds to an enzyme and is required for its catalytic activity. Cofactor. See Coenzyme. Colony.
Endonuclease -- an enzyme that breaks the internal phosphodiester bonds in a DNA molecule. Ethics -- the study of fundamental principles which defines values and determines moral duty and obligation.
restriction enzyme cutting sites, genes), regardless of inheritance. Distance is measured in base pairs.
Enzyme - a protein utilized in chemical reactions
Eukaryotes - advanced cell type with a nuclear membrane surrounding genetic material and numerous membrane-bound organelles dispersed in a complex cellular structure ...
Enzymes present in the Golgi lumen modify the carbohydrate (or sugar) portion of glycoproteins by adding or subtracting individual sugar monomers.
Your body also starts to release enzymes that start the process of chemical digestion and the breakdown of biological molecules. Most chemical digestion happens in the stomach.
induced - the process by which an enzyme is synthesized in response to the presence of an external substance, the inducer.
Pathways can be browsed or searched by a variety of parameter such as reactions, compunds, genes and enzymes. Each pathway can be viewed from a gross perspective or zoomed in to display detailed sections.
A variant of an enzyme type. These may be variants of a specific enzyme (e.g., cytochrome c) that are the products of a single genetic locus.
Amensal. Negatively affecting one or several species
Amino acids. Basic structural unit of proteins ...
Gene: the segment of DNA at a particular locus on a particular chromosome that controls production of proteins and enzymes and influences the development of a specific trait.
 See also: Protein, Trans, Organ, Cells, Enzymes
|
