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Figure 4
Structures of designer PPR proteins and their complexes. (a, b) Consensus P-class repeat proteins in the absence of RNA. (c, d) Consensus P-class repeat proteins in the presence of RNA. (e, f) Consensus PLS-class proteins in the absence and presence of MORF cofactor. MORF is labelled in light orange. (g) Superimposed structure of PLS-class proteins in the presence and absence of MORF cofactor, with P, L and S motifs labelled. Orientation of the fifth amino acid in PDB entry 5izw (grey) without MORF and PDB entry 5iwb (red) with MORF are zoomed in. Helices a and b of L motifs are zoomed in to show the difference in their orientation of the motifs upon binding MORF protein. (h) Residues involved in the interactions between MORF and P, L and S motifs (adapted from Yan et al., 2017View full citation).

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
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