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Structural Basis of Sequential and Concerted Cooperativity.

Veronica Morea1, Francesco Angelucci2, Jeremy R H Tame3

  • 1Institute of Molecular Biology and Pathology (IBPM), National Research Council of Italy (CNR) c/o Dipartimento di Scienze Biochimiche "A. Rossi Fanelli", Sapienza Università di Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy.

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Summary

Allostery describes how proteins change shape to regulate function. This study combines structural and functional analysis to differentiate between the concerted and sequential models of allosteric regulation in proteins.

Keywords:
KNF modelMWC modelallosteryheterotropic regulation

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Allostery involves cooperative ligand binding and effector-mediated affinity regulation in macromolecules.
  • The concerted and sequential models, proposed by Monod-Jacob and Pauling-Koshland respectively, offer distinct frameworks for understanding allosteric mechanisms.
  • Distinguishing between these models solely through equilibrium or kinetic data is challenging.

Purpose of the Study:

  • To investigate cooperative protein mechanisms by integrating functional and structural analyses.
  • To identify key features that differentiate between the concerted and sequential allosteric models.

Main Methods:

  • Analysis of established cooperative proteins with known functional behaviors (sequential or concerted).
  • Combined approach utilizing both functional (equilibrium/kinetics) and structural data.
  • Examination of protein interfaces and structural changes upon ligand binding.

Main Results:

  • Isologous interfaces, predominantly helical, are prevalent in cooperative proteins irrespective of their allosteric mechanism.
  • Tertiary and quaternary structural changes contribute differently to each model.
  • Asymmetry in the liganded state appears to be a distinguishing factor between the two models.

Conclusions:

  • A combined functional and structural approach provides a more robust method for elucidating allosteric mechanisms.
  • Specific structural features, such as interface type and asymmetry, can help differentiate between concerted and sequential allostery.
  • Understanding these mechanisms is crucial for comprehending protein regulation and function.