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THE PLANT CELL, Vol 9, Issue 6 879-894, Copyright © 1997 by American Society of Plant Biologists
The Arabidopsis Downy Mildew Resistance Gene RPP5 Shares Similarity to the Toll and Interleukin-1 Receptors with N and L6
J. E. Parker, M. J. Coleman, V. Szabo, L. N. Frost, R. Schmidt, E. A. van der Biezen, T. Moores, C. Dean, M. J. Daniels and JDG. Jones
Sainsbury Laboratory, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, United Kingdom
Plant disease resistance genes operate at the earliest steps of pathogen
perception. The Arabidopsis RPP5 gene specifying resistance to the downy
mildew pathogen Peronospora parasitica was positionally cloned. It encodes
a protein that possesses a putative nucleotide binding site and
leucine-rich repeats, and its product exhibits striking structural
similarity to the plant resistance gene products N and L6. Like N and L6,
the RPP5 N-terminal domain resembles the cytoplasmic domains of the
Drosophila Toll and mammalian interleukin-1 transmembrane receptors. In
contrast to N and L6, which produce predicted truncated products by
alternative splicing, RPP5 appears to express only a single transcript
corresponding to the full-length protein. However, a truncated form
structurally similar to those of N and L6 is encoded by one or more other
members of the RPP5 gene family that are tightly clustered on chromosome 4.
The organization of repeated units within the leucine-rich repeats encoded
by the wild-type RPP5 gene and an RPP5 mutant allele provides molecular
evidence for the heightened capacity of this domain to evolve novel
configurations and potentially new disease resistance specificities.
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