8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-477-C7-478
Protein movement within the bacteriorhodopsin photocycle detected by beam deflection spectroscopyP. Schulenberg, W. Gärtner and S.E. Braslavsky
Max-Planck-Institut für Strahlenchemie, Postfach 10 13 65, 45413 Mülheim an der Ruhr, Germany
Photothermal beam deflection of the bacteriorhodopsin photocycle in the time range from 1 to 200 µs resolved a new process with a time constant of ca. 20 µs at 20 °C in addition to the decays of the K and L intermediates with time constants of 1.3 and 90 µs. The latter time constants are identical to those measured by flash photolysis with optical detection on the same samples. The additional process may be attributed to a protein conformational change concomitant with the proton transfer.
© EDP Sciences 1994