The N-terminal α-helices of YopM mediate cellular uptake and are able to deliver proteins as cargo. The N-terminal α-helices of YopM mediate cellular uptake.

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The N-terminal α-helices of YopM mediate cellular uptake and are able to deliver proteins as cargo. The N-terminal α-helices of YopM mediate cellular uptake and are able to deliver proteins as cargo. (A) Schematic overview of different truncated YopM versions and detection of these proteins by cellular fractionation of HeLa cells after 30 minutes incubation with the respective recombinant protein (25 μg/ml). (B) Schematic overview of YopE and GFP fused to the N-terminal domain of YopM. The ability of 2αH-YopE and 2αH-GFP to enter host-cell membranes was analyzed by immunoblot analysis of fractionated HeLa cells after 30 minutes incubation with the fusion proteins (25 μg/ml) and control proteins (YopE and GFP; 25 μg/ml). (C) Fluorescence microscopy of HeLa cells after 1 hour incubation with recombinant 2αH-GFP (green) (15 μg/ml). DNA was stained with DAPI (blue). Overlay of both channels (merge). Christian Rüter et al. J Cell Sci 2010;123:2190-2198 © 2010.