Tertiary-Structure Relaxation in Hemoglobin: A Transient Raman Study

Thomas W. Scott, Joel M. Friedman

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

Tertiary relaxation in photodissociated hemoglobins has been monitored by using time-resolved resonance Raman scattering. It is observed that the submicrosecond tertiary-structure relaxation which precedes the switch in quaternary structure is sensitive to factors influencing R state stability. At pH 7 and lower, substantial relaxation involving the iron-proximal histidine linkage occurs over the time scale of geminate recombination. Because the structural parameter associated with the variation in this linkage has been implicated in the protein modulation of ligand binding, this result supports the idea of a dynamic barrier which increases on the time scale of geminate recombination. On the basis of these findings a model is presented which accounts for solution-dependent variations in ligand reactivity within a given quaternary structure.

Original languageEnglish (US)
Pages (from-to)5677-5687
Number of pages11
JournalJournal of the American Chemical Society
Volume106
Issue number19
DOIs
StatePublished - Sep 1 1984
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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