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Protein kinases

E J Goldsmith1, M H Cobb

  • 1Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas 75235.

Current Opinion in Structural Biology
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

Structural analysis of four serine/threonine protein kinases reveals how their activity is regulated. Key mechanisms include phosphorylation lip conformation, domain rotation, and inhibitor/autoinhibitory domain binding.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Protein kinases are crucial enzymes regulating cellular processes.
  • Understanding kinase regulation is vital for drug development.
  • Recent structural data provides new insights into kinase function.

Purpose of the Study:

  • To elucidate the structural basis of serine/threonine protein kinase regulation.
  • To compare newly determined kinase structures with cAMP-dependent protein kinase (cAPK).

Main Methods:

  • X-ray crystallography to determine protein structures.
  • Comparative structural analysis.

Main Results:

  • Four serine/threonine protein kinase structures were determined.

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  • Comparison with cAPK structure identified conserved regulatory features.
  • Low activity states are associated with specific conformations of the phosphorylation lip and domain orientations.

    • Conclusions:

    • Kinase activity is modulated by the phosphorylation lip conformation.
    • Domain rotations play a role in regulating enzyme activity.
    • Inhibitor and autoinhibitory domain binding are key to maintaining low kinase activity.