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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
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The transfer function is a fundamental concept in the analysis and design of linear time-invariant (LTI) systems. It offers a concise way to understand how a system responds to different inputs in the frequency domain. It serves as a bridge between the time-domain differential equations that describe system dynamics and the frequency-domain representation that facilitates easier manipulation and analysis.
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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
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Discovering Protein Interactions and Characterizing Protein Function Using HaloTag Technology
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Newly-discovered enzymes that function in metabolite damage-control.

Valérie de Crécy-Lagard1, Drago Haas2, Andrew D Hanson3

  • 1Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, USA; Genetics Institute, University of Florida, Gainesville, FL, USA.

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Scientists are discovering new enzymes that manage harmful cellular waste products. Comparative genomics is key to identifying these crucial damage-control enzymes and understanding their roles in metabolism.

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Area of Science:

  • Biochemistry
  • Genomics
  • Enzymology

Background:

  • Approximately 25% of sequenced proteomes consist of enzymes with unknown functions.
  • Over 20 conserved enzyme families involved in metabolizing wasteful and toxic compounds have been identified in the last decade.
  • These enzymes play critical roles in cellular homeostasis by managing abnormal metabolites.

Purpose of the Study:

  • To highlight the significance of discovering enzymes with unknown functions.
  • To emphasize the role of newly identified damage-control enzymes in cellular metabolism.
  • To underscore the utility of comparative genomics in functional enzyme prediction.

Main Methods:

  • Utilizing comparative genomics to predict the functions of enzymes.
  • Employing biochemical assays to validate predicted enzyme functions.
  • Conducting genetic analyses to confirm enzyme roles in metabolic pathways.

Main Results:

  • Identification of over 20 conserved enzyme families involved in damage control.
  • Demonstration that these enzymes either repair, inactivate, or prevent the formation of toxic metabolites.
  • Validation of predicted enzyme functions through experimental approaches.

Conclusions:

  • Comparative genomics is a powerful tool for deciphering enzyme functions.
  • The discovery of damage-control enzymes expands our understanding of metabolic pathways.
  • Understanding these enzymes is crucial for comprehending cellular defense mechanisms against metabolic stress.