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Related Experiment Videos

Loop closure and intersubunit communication in tryptophan synthase

T R Schneider1, E Gerhardt, M Lee

  • 1Department for Physical Biochemistry, Max-Planck-Institute for Molecular Physiology, Dortmund, Germany.

Biochemistry
|May 16, 1998
PubMed
Summary
This summary is machine-generated.

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Tryptophan synthase crystal structures reveal how the aminoacrylate intermediate at the beta-site allosterically activates the alpha-reaction. A communication pathway involving a novel domain links the alpha and beta active sites, explaining enzyme regulation.

Area of Science:

  • Enzymology
  • Structural Biology
  • Biochemistry

Background:

  • Tryptophan synthase catalyzes essential amino acid biosynthesis.
  • Understanding its allosteric regulation is key to enzyme mechanism.
  • The alpha- and beta-subunits have distinct active sites with complex interplay.

Purpose of the Study:

  • To elucidate the mechanism of allosteric activation of the alpha-reaction by the beta-reaction intermediate.
  • To determine the structural basis for communication between the alpha and beta active sites.
  • To present detailed models of ligand binding and intermediate formation.

Main Methods:

  • X-ray crystallography of wild-type tryptophan synthase alpha2beta2 complexes from Salmonella typhimurium.
  • In-crystal steady-state generation of the aminoacrylate intermediate using a flow cell.

Related Experiment Videos

  • Comparison of enzyme structures with and without alpha-site ligand (5-fluoroindole propanol phosphate).

    • Main Results:

    • A model for the Schiff base conformation of the aminoacrylate intermediate with pyridoxal phosphate (PLP) is presented.
    • Binding of the alpha-site ligand 5-fluoroindole propanol phosphate (F-IPP) induces loop alphaL6 closure.
    • A novel, rigid yet movable domain mediating communication between alpha and beta active sites was identified.

    Conclusions:

    • The study establishes a structural pathway for communication between the alpha and beta active sites.
    • Findings provide a structural basis for the allosteric properties of tryptophan synthase.
    • The identified domain is crucial for transmitting signals between active sites, explaining enzyme regulation.