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. 2014 May 14;111(21):7653–7658. doi: 10.1073/pnas.1322200111

Fig. 7.

Fig. 7.

WXG substrate composite recognition signal model. Wild-type YukE contains two equivalent recognition sites located on each end of the elongated dimer consisting of four α-helices. The WXG loop of one subunit and the C-terminal residues of the second subunit constitute the bipartite recognition signal. One intact composite recognition site is sufficient for secretion of the complexed, folded substrate.