active site

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ac·tive site

that portion of an enzyme molecule at which the actual reaction proceeds; considered to consist of one or more residues or atoms in a spatial arrangement that permits interaction with the substrate to effect its reaction.

active site

The part of an enzyme at which catalysis of the substrate occurs.

active site

the place on the surface of an enzyme where its catalytic action occurs.

Active Site

The site in an enzyme where a substrate binds and an enzymatic reaction—e.g., ligation, oxidoreduction, etc.—occurs. The structure of the amino acid residues within the active site enhances substrate binding, substrate activation, and formation of a transition state.

ac·tive site

(ak'tiv sīt)
That portion of an enzyme molecule at which the actual reaction proceeds; one or more residues or atoms in a spatial arrangement that permits interaction with the substrate.

active site

1. The region of an ENZYME to which the substance being affected binds so as to undergo a catalyzed reaction.
2. The localized part of a protein to which a substrate binds.
Active siteclick for a larger image
Fig. 11 Active site . Lock-and-key mechanism of enzyme activity.

active site

an area of ENZYME surface which has a shape complementary to a particular SUBSTRATE, enabling the enzyme and substrate to become temporarily bonded to form an enzyme-substrate complex. Such a lock-and-key mechanism explains the great specificity of enzymes for substrates and also why changes in enzyme three-dimensional shape (by pH, temperature) cause alterations to enzyme activity.


not passive.

active principle
the drugs or chemicals in a pharmaceutical preparation that exert an effect pharmacologically; as distinct from the inert fillers, wetting agents and other excipients also often included.
active site
that region of a protein, usually an enzyme, that binds to another molecule such as the substrate of the enzyme.
active transport
the movement of ions or molecules assisted by a carrier protein across the cell membranes and epithelial layers, usually against a concentration gradient, resulting directly from the expenditure of metabolic energy. For example, under normal circumstances more potassium ions are present within the cell and more sodium ions extracellularly. The process of maintaining these normal differences in electrolytic composition between the intracellular fluids is active transport. The process differs from simple diffusion or osmosis in that it requires the expenditure of metabolic energy.

Patient discussion about active site

Q. Are there any nice activities for adults with autism? I've been helping a very nice man of 45 of years old and I'm looking for some new things I can do with him in our time together. any ideas?

A. Autistic people react wonderfully with animals. for instance- i saw a group of severe Autistic teenagers going to swim with dolphins. the effect was amazing! taking him to the zoo, or even to the park to feed ducks, pet dogs, whatever.. could have a great effect on him.
hope i helped!
tell me how it went.

Q. what is a passive smoking? and is it dangerous as an active?

A. Passive smoking is the exposure to cigarettes smoke emitted from cigarettes smoke by other person. It's dangerous and may increase the risk to several diseases similar to active smoking (one's exposure to smoke emitted from the cigarettes he or she is smoking) although the risk is of lower magnitude. Example for passive smoking is children of smokers etc.

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Q. i swim a lot ! what are the advantages of swimming over other sport activities? on what part of the body does it work the most ?

A. its a good workout but your not really going to burn as much calories as a regular work out.

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References in periodicals archive ?
Utah has an elegant and highly functional site that sets the bar for the rest of the nation.
Information is accessed through a functional site complete with search, topics, news, document management, and more.
This latest version offers customers a more robust and functional site along with new purchase options not available on the earlier versions.
The team blended the former Bell Atlantic and former GTE sites into a functional site containing 30,000 content pages and 10,000 transaction pages; steered by 50,000 business rules running 5 million lines of code; and interconnecting more than 200 billing, ordering and operating systems across the nation.
To maintain its position as the leading provider of operations system support systems to the rapidly changing communications industry, privately-held Auspice Corporation has moved its corporate headquarters to a larger, more functional site.
The ILS Quick Catalogue has enabled Arrell to quickly create a scalable and highly functional site with very little overhead," said Rick Leatherwood, President of Arrell Aircraft.
Its list of commercial products includes a family of gene, promoter and functional site prediction, new genome annotation, genomes comparison and sequence mapping programs, RNA and protein structure modeling tools, protein sub-cellular location and epitope prediction, database of regulatory motifs and many others.
Molecular consultants seek to deliver a highly functional site which reflects a thorough understanding of customer
He credited Macy's, Bed Bath & Beyond and WaLmart for having highly functional sites and Macy's and Walm art for having the most aggressive strategies for online.
Such broadly neutralizing antibodies typically work by blocking crucial functional sites on a virus that are conserved among different strains despite high mutation elsewhere.
arGEN-X will generate novel human monoclonal antibody (mAb) candidates that act on diverse functional sites on Lilly targets.
The creators of business organising software 1DayLater wanted to set up a project which allowed businesses to network while providing functional sites for charities which might have an outdated or non-existent web presence.

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