The molecular mechanism of temperature enhancement of proton magnetic relaxation rates in methaemoprotein solutions. III. The effect of sixth ligand in high-spin derivatives

S. Vuk-Pavlović

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The distinctions of the solvent-proton longitudinal magnetic relaxation (PMES.) mechanisms between high-spin ferric aquo and fluoro complexes of some haemoproteins are discussed here. It becomes apparent that the "transition" from the exchange-limited PMR to the fast-exchange PMR mechanism upon addition of fluoride to some of the aquocomplexes is due to a more intense solvent-dynamics in the vicinity of the paramagnetic haem in the fluoromet derivatives This can be rationalized by a conformational change induced by the fluoride ion, an effect not observed by X-ray analysis thus far. A possible mechanism of this change is indicated here.

Original languageEnglish (US)
Pages (from-to)395-398
Number of pages4
JournalBiophysical Chemistry
Volume5
Issue number3
DOIs
StatePublished - Sep 1976

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Organic Chemistry

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