Cooperative long range protein-protein dynamics in Purple Membrane

Details Cooperative long range protein-protein dynamics in Purple Membrane Cooperative long range protein-protein dynamics in Purple Membrane

2008-03-06

arxiv.org/abs/0803.0959v5

Phys. Rev. Lett. 103, 128104 (2009) (4 pages)

Physics

Biological Physics

Please check journal reference for accepted version of the paper

Scientific paper

10.1103/PhysRevLett.103.128104

We present experimental evidence for a long-range protein-protein interaction in purple membrane (PM). The interprotein dynamics were quantified by measuring the spectrum of the acoustic phonons in the 2D bacteriorhodopsin (BR) protein lattice using inelastic neutron scattering. Phonon energies of about 1 meV were determined. The data are compared to an analytical model, and the effective spring constant for the interaction between neighboring protein trimers are determined to be k=53 N/m. Additional, optical-like excitations at 0.45 meV were found and assigned to intraprotein dynamics between neighboring BR monomers.

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