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In the present work, we developed a statistical mechanical model for the dynamics of cotransport. In particular, the symport of lactose and H and the antiport of triose-P and Pi were analyzed. In both cases, our starting point was to determine the free-energy curve of the transport cycle based on the biochemical structure of each state. Then, using the Metropolis algorithm in a nonhomogeneous random walk model, we determined the dynamics of the cycle expressed in the free-energy curve obtained previously. Both in the case of LacY and TPT, the agreement between our model predictions and the experimental data suggests that our free-energy curve is appropriate for describing the transport process across the plasma membrane.

Modelagem de mecânica estatística de processos de transporte através da membrana celular