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constitutive enzyme

constitutive enzyme

A Dictionary of Zoology | 1999 | | Copyright

constitutive enzyme An enzyme that is always produced whether or not a suitable substrate is present (enzymes functioning by forming a complex with the substrate, see LOCK-AND-KEY THEORY). Such enzymes are sometimes produced by particular regulatory mutants which, though not affecting the structure of the enzyme, instead affect the process by which its synthesis occurs. An example is the lac-operon, which controls the synthesis of three enzymes: (betagalactosidase, permease, and acetylase) enzymes that are involved in the lactose metabolism of the bacterium Escherichia coli.
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MICHAEL ALLABY. "constitutive enzyme." A Dictionary of Zoology. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "constitutive enzyme." A Dictionary of Zoology. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O8-constitutiveenzyme.html

MICHAEL ALLABY. "constitutive enzyme." A Dictionary of Zoology. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-constitutiveenzyme.html

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constitutive enzyme

A Dictionary of Plant Sciences | 1998 | | Copyright

constitutive enzyme An enzyme that is always produced whether or not a suitable substrate is present. Such enzymes are sometimes produced by particular regulatory mutants which, though not affecting the structure of the enzyme, instead affect the process by which its synthesis occurs. An example is the lac-operon, which controls the synthesis of three enzymes (beta-galactosidase, permease, and acetylase): enzymes that are involved in the lactose metabolism of the bacterium Escherichia coli.
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MICHAEL ALLABY. "constitutive enzyme." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "constitutive enzyme." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O7-constitutiveenzyme.html

MICHAEL ALLABY. "constitutive enzyme." A Dictionary of Plant Sciences. 1998. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-constitutiveenzyme.html

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