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. 2017 Aug 24;7:9279. doi: 10.1038/s41598-017-09473-x

Figure 4.

Figure 4

The FP-RK motif is critical in CrRbcS-nt[FP-RK] for protein import into chloroplasts. (A) Sequences of CrRbcS-nt[FP-RK] and its substitution mutants. All constructs were fused to GFP. (B) Localization of reporter proteins. Protoplasts from Arabidopsis plants were transformed with the indicated constructs, and GFP patterns were observed 12 h after transformation. Green, red, and yellow signals represent GFP, chlorophyll autofluorescence, and the overlap between green and red signals, respectively. Scale bar = 20 μm. (C) Western analysis of the reporter proteins. Total protein extracts from transformed protoplasts were analyzed by western blotting using anti-GFP antibody. Pre, precursor form; P1, processed form 1; P2, processed form 2. Signal intensity of protein bands was measured using LAS3000 imager (FUJI FILM) software, and import efficiency was defined as described in Fig. 3G. Error bar = SD (n = 3).