Accession Number : ADA575958


Title :   Elucidation of Prion Protein Conformational Changes Associated with Infectivity by Fluorescence Spectroscopy


Descriptive Note : Final rept. 15 May 2003 - 14 May 2007


Corporate Author : MONTANA UNIV MISSOULA


Personal Author(s) : McGuirl, Michele A ; Gilbert, Jessica


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a575958.pdf


Report Date : Jun 2007


Pagination or Media Count : 146


Abstract : Steady state and lifetime fluorescence measurements were made on 12 single tryptophan mutants of recombinant hamster prion protein, using acrylamide as quencher. The fluorescent properties of tryptophan are known to be sensitive to the local protein environment, so they were measured for three forms of the protein: the alpha-helical monomeric form (the normal form), the octameric beta-oligomer, and the fibrillar state. The latter two are models of the diseased state. All mutants examined showed that upon conversion from the alpha-helical form to the beta sheet states, the tryptophan became more buried/less solvent exposed. The data support the structural model of prion amyloid put forth by Cobb and Surewicz, which shows in-register stacking of beta strands in the amyloid core.


Descriptors :   *FLUORESCENCE , *PROTEINS , *SPECTROSCOPY , HAMSTERS , MUTATIONS , PRIONS(PATHOGENS) , STEADY STATE , TRYPTOPHAN


Subject Categories : Microbiology
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE