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. 2014 Oct 23;3:e03766. doi: 10.7554/eLife.03766

Figure 5. AtLYK5 regulates chitin-induced phosphorylation and homodimerization of AtCERK1.

(A) AtLYK5 associates with AtCERK1 after chitin treatments. HA-tagged AtCERK1 and Myc-tagged AtLYK5 or AtCERK1 were co-expressed in protoplasts made from Col-0 wild-type plants. Protoplasts were harvested with or without the treatment with 1 µM chitooctaose as labeled above. Co-immunoprecipitation was made using anti-Myc antibody. Left panel and right panel are cropped from the same gel. (B) The association between AtCERK1 and AtLYK5 is induced by different chitin oligomers. Protoplasts were treated with different chitin oligomers (1 µM) as shown above for 15 min. (C) AtLYK5 regulates chitin-induced AtCERK1-AtCERK1 association. HA-tagged AtCERK1 and Myc-tagged AtCERK1 were copexpressed in protoplasts made from Col-0 wild-type or Atlyk5-2 mutant plants. Protoplasts were harvested with or without the treatment with 1 µM chitooctaose. Co-immunoprecipitation was made using anti-Myc antibody. (D) AtLYK5 controls chitin-induced phosphorylation of AtCERK1. Plant leaves from wild-type and the Atlyk5-2 mutant plants were treated with 1 µM chitooctaose for the time shown above. Anti-AtCERK1 antibody was used to detect the phosphorylation status of AtCERK1 shown as a shift in protein migration. Lower panel shows a non-specific band used to assess similar loading of each lane.

DOI: http://dx.doi.org/10.7554/eLife.03766.016

Figure 5.

Figure 5—figure supplement 1. AtLYK4 associates with AtCERK1 before and after chitin treatment.

Figure 5—figure supplement 1.

(A) Interaction between AtCERK1 and AtLYK4. HA-tagged AtCERK1 and Myc-tagged AtLYK4 were co-expressed in protoplasts from Col-0 wild type plants. Protoplasts either prior (−) or after treatment with 1 µM chitooctaose were harvested. Co-immunoprecipitation used anti-Myc antibody. IB, immunoblot detected with either anti-HA or anti-Myc antibodies. (B) Chitin-induced phopshorylation of AtCERK1. Mature leaves from Col-0 wild-type, Atlyk4, and Atlyk5-2 mutant plants were treated with 1 µM chitin oligomers for 15 min. Total protein was separated on 7% SDS-PAGE and immunoblots were detected with anti-AtCERK1 antibody. Protein band shift indicates phosphorylation. 6mer: chitohexaose, 7mer: chitoheptaose, and 8mer: chitooctaose. Upper panel shows immunoblot probed with anti-AtCERK1 antibody, lower panel shows a non-specific band detected by anti-AtCERK1 antibody as a loading control.