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The fluorescence signal recorded in the acceptor channel in the presence of SecA and ATP corresponded http://www.selleckchem.com/products/INCB18424.html to the partially translocated and trapped proOmpAC282-DhfR-Atto 647N molecules. The contribution of fluorescence from the membrane-bound proOmpAC282-DhfR-Atto 647N to the fluorescence correlation function could be neglected, as their molecular brightness was at least 10-fold lower than that of SecYEG-trapped preproteins. If ATP was replaced by the non-hydrolysable analogue AMP-PNP or if no SecA was added, we did not observe either an increase in the acceptor fluorescence (Figure 3D) or a time-correlated signal. Thus, the approach discriminated stable translocation intermediates from the partially http://www.selleck.cn/products/U0126.html inserted or non-specifically bound preprotein molecules. Decreasing the translocation time down to 3 min caused an increase in the amplitude of proOmpA-DhfR-Atto 647N autocorrelation function, as the number of DhfR-trapped intermediate complexes decreased (Supplementary Figure S4). The autocorrelation curves recorded in both channels upon the translocation reaction contained detailed and quantitative information about the protein diffusion rates and the stoichiometry of the interactions. Since the amplitude of the autocorrelation function yields an accurate measure of the number of fluorescent particles (Figure 2E), the technique could be used to directly quantify the efficiency of translocation intermediate formation expressed as the ratio of the total number SecYEG complexes and trapped proOmpA-DhfR molecules. The most probable SecY:preprotein ratio measured on individual GUVs was 2.8 (Figure 3F, grey bars; n=45). The vesicles manifesting higher ratios, that is, lower translocation efficiency, typically showed a high SecYEG content of 20�C30 molecules in observation volume. They likely reflected a minor non-unilamellar http://www.selleckchem.com/products/PLX-4032.html fraction comprising