61 research outputs found
Peptide size dependent active transport in the proteasome
We investigate the transport of proteins inside the proteasome and propose an
active transport mechanism based on a spatially asymmetric interaction
potential of peptide chains. The transport is driven by fluctuations which are
always present in such systems. We compute the peptide-size dependent transport
rate which is essential for the functioning of the proteasome. In agreement
with recent experiments, varying temperature changes the transport mechanism
qualitatively.Comment: 4 pages, 4 figure
Molecular dynamics of arbitrarily shaped granular particles}
We propose a new model for the description of complex granular particles and
their interaction in molecular dynamics simulations of granular material in two
dimensions. The grains are composed of triangles which are connected by
deformable beams. Particles are allowed to be convex or concave. We present
first results of simulations using this particle model.Comment: uuencoded compressed PostScript, 40 pages, 19 figures (included
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