activator

views updated Jun 08 2018

activator
1. A type of transcription factor that enhances the transcription of a gene by binding to a region of DNA called an enhancer. Compare repressor.

2. A substance that – by binding to an allosteric site on an enzyme – enables the active site of the enzyme to bind to the substrate.

3. Any compound that potentiates the activity of a drug or other foreign substance in the body.

A Dictionary of Biology

activator

views updated May 21 2018

activator A metal ion that functions in conjunction with either an enzyme or its substrate in order to bring about a reaction.

A Dictionary of Ecology MICHAEL ALLABY

activator

views updated May 17 2018

activator A metal ion that functions in conjunction with either an enzyme or its substrate in order to bring about a reaction.

A Dictionary of Plant Sciences MICHAEL ALLABY

activator

views updated May 18 2018

activator A metal ion that functions in conjunction with either an enzyme or its substrate in order to bring about a reaction.

A Dictionary of Zoology MICHAEL ALLABY

activator

views updated May 18 2018

activator (ak-ti-vay-ter) n. a substance that stimulates a chemical change or reaction.

A Dictionary of Nursing

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activator

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