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Definition of «Enzyme»

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Enzyme: A protein (or protein-based molecule) that speeds up a chemical reaction in a living organism. An enzyme acts as catalyst for specific chemical reactions, converting a specific set of reactants (called substrates) into specific products. Without enzymes, life as we know it would not exist.

Enzymes are nonetheless subject to error. In 1902 Sir Archibald Garrod was the first to attribute a disease to an enzyme defect, to what Garrod called an "inborn error of metabolism." Today, newborns are routinely screened for certain enzyme defects such as PKU (phenylketonuria) and galactosemia, an error in the handling (metabolism) of the sugar galactose.

For More Information «Enzyme»

  • enzyme: Definition from Answers.com

    Library > Literature & Language > Dictionary ( ĕn ' zīm ) n. Any of numerous proteins or conjugated proteins produced by living organisms and functioning as ...

  • ExPASy - ENZYME

    ENZYME is a repository of information relative to the nomenclature of enzymes. It is primarily based on the recommendations of the Nomenclature Committee of the ...

  • Enzyme - New World Encyclopedia

    Ribbon diagram of the enzyme TIM. Each enzyme has a specific three-dimensional structure that determines its function.

  • Enzymes

    Generally, a given enzyme is able to catalyze only a single chemical reaction or, at most, a few reactions involving substrates sharing the same general structure.

  • Enzyme | Define Enzyme at Dictionary.com

    noun Biochemistry . any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by ...

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