Abstract
Plant pathogenic microbes secrete proteins known as effectors, which enter the cytoplasm of plant cells and suppress host defences. Known effectors in oomycete pathogens possess an RXLR-EER motif in their amino acid sequence that is necessary for transport of the effector into a host plant cell. A large number of putative effectors have now been identified in oomycete genomes, the sequences of which show evidence of diversifying selection at their C terminus. Here, we describe recent progress in characterizing RXLR-EER effectors and discuss why so many of these rapidly evolving proteins are encoded by the genomes of plant pathogenic oomycetes.
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