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Folding of mtHsp70 in organello depends on the Hep1 chaperone. (A–C) Folding of mtHsp70 (A), ATPaseLinker-DHFR (B), and PBD-DHFR (C) upon import into mitochondria lacking Hep1. Radiolabeled precursor proteins were imported into Δhep1 and wild-type (wt) mitochondria. Import was stopped by addition of valinomycin, and samples were further incubated for the time periods indicated and treated as described in Fig. 1 A. Asterisks indicate folded DHFR domain with nondigested spacer.
