Demonstration of long range interactions in a PDZ domain by NMR, kinetics and protein engineering

Alessandro Arcovito, Stefano Gianni, Tina Walma, Nicoletta Calosci, Åke Engström, Carlo Travaglini Allocatelli, Maurizio Brunori, Per Jemth, Gerteen Vuister

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

89 Citazioni (Scopus)

Abstract

Understanding the basis of communication within protein domains is a major challenge in structural biology. We present structural and dynamical evidence for allosteric effects in a PDZ domain, PDZ2 from the tyrosine phosphatase PTP-BL, upon binding to a target peptide. The NMR structures of its free and peptide-bound states differ in the orientation of helix alpha2 with respect to the remainder of the molecule, concomitant with a readjustment of the hydrophobic core. Using an ultrafast mixing instrument, we detected a deviation from simple bimolecular kinetics for the association with peptide that is consistent with a rate-limiting conformational change in the protein (k(obs) approximately 7 x 10(3) s(-1)) and an induced-fit model. Furthermore, the binding kinetics of 15 mutants revealed that binding is regulated by long-range interactions, which can be correlated with the structural rearrangements resulting from peptide binding. The homologous protein PSD-95 PDZ3 did not display a similar ligand-induced conformational change.
Lingua originaleEnglish
pagine (da-a)1801-1809
Numero di pagine9
RivistaStructure
Stato di pubblicazionePubblicato - 2006

Keywords

  • Kinetics
  • NMR
  • PDZ domain

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