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Related Experiment Videos

Engineering aspartate transcarbamylase.

G Hervé1, X G Xi, M Ladjimi

  • 1Laboratoire d'Enzymologie, CNRS, Gif-sur-Yvette, France.

Biochimie
|August 1, 1990
PubMed
Summary

Aspartate transcarbamylase (ATCase) from Escherichia coli is a model regulatory enzyme. Engineering ATCase variants reveals key regions and residues involved in its cooperative and allosteric regulation by CTP and ATP.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Aspartate transcarbamylase (ATCase) from Escherichia coli is a well-established model enzyme for studying protein cooperativity and allostery.
  • Its complex structure and regulatory mechanisms make it ideal for investigating enzyme function.

Purpose of the Study:

  • To elucidate the structural and molecular basis of cooperativity and allosteric regulation in Escherichia coli aspartate transcarbamylase.
  • To identify specific regions, domains, interfaces, and amino acid residues critical for enzyme function.

Main Methods:

  • Utilized diverse protein engineering techniques, including random and site-directed mutagenesis.
  • Employed subunit dissociation/reassociation strategies and constructed hybrid and chimeric enzymes.
  • Investigated interspecific hybrids to probe evolutionary and functional relationships.

Main Results:

  • Detailed information was obtained regarding the regions, domains, interfaces, and amino acid residues involved in catalytic site cooperativity.
  • The mechanisms of regulation by antagonistic effectors, cytidine triphosphate (CTP) and adenosine triphosphate (ATP), were investigated.
  • Pathways for the transmission of intramolecular signals induced by CTP and ATP are beginning to be understood.

Conclusions:

  • Engineering approaches provide significant insights into the allosteric regulation of aspartate transcarbamylase.
  • The study delineates the molecular players and signaling pathways governing ATCase cooperativity and effector response.

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