NR AVYQ
AU Rubenstein,R.; Gray,P.C.; Cleland,T.J.; Piltch,M.S.; Hlavacek,W.S.; Roberts,R.M.; Ambrosiano,J.; Kim,J.I.
TI Dynamics of the nucleated polymerization model of prion replication
QU Biophysical Chemistry 2007 Feb; 125(2-3): 360-7
PT journal article; research support, n.i.h., extramural; research support, non-u.s. gov't
AB The disease process for transmissible spongiform encephalopathies (TSEs), in one way or another, involves the conversion of a predominantly alpha-helical normal host-coded prion protein (PrPc) to an abnormally folded (predominantly beta sheet) protease resistant isoform (PrPsc). Several alternative mechanisms have been proposed for this auto-catalytic process. Here the dynamical behavior of one of these models, the nucleated polymerization model, is studied by Monte Carlo discrete-event simulation of the explicit conversion reactions. These simulations demonstrate the characteristic dynamical behavior of this model for prion replication. Using estimates for the reaction rates and concentrations, time courses are estimated for concentration of PrPsc, PrPsc aggregates, and PrPc as well as size distributions for the aggregates. The implications of these dynamics on protein misfolding cyclic amplification (PMCA) is discussed.
MH Animals; Humans; *Models, Chemical; Monte Carlo Method; Particle Size; *Polymers; PrPc Proteins; PrPsc Proteins; Prions/*biosynthesis/*chemistry; Protein Folding
AD SUNY Down State Medical Center, Brooklyn, NY 11203, USA. richard.rubenstein@downstate.edu
SP englisch
PO Niederlande