Inside Cover: Exploring the Conformation-Regulated Function of Titin Kinase by Mechanical Pump and Probe Experiments with Single Molecules (Angew. Chem. Int. Ed. 6/2010)



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The molecular-force sensor titin kinase (TK) is embedded in the M-band structure of the sarcomere at an ideal position to sense force imbalances. H. E. Gaub and E. M. Puchner demonstrate in their Communication on page 1147 ff. a new AFM-based single-molecule pump-and-probe protocol to mechanically prepare different conformations of TK and to read out their function. The results show that the binding pocket for the co-substrate ATP is shielded by two sequential barriers in the force-induced activation pathway.