Plant Physiology 138:611-623 (2005)
© 2005 American Society of Plant Biologists
GENOME ANALYSIS
Phylogenomic Analysis of the Receptor-Like Proteins of Rice and Arabidopsis1,[w]
Lillian K. Fritz-Laylin,
Nandini Krishnamurthy,
Mahmut Tör,
Kimmen V. Sjölander2,* and
Jonathan D.G. Jones2
Department of Molecular and Cell Biology (L.K.F.-L.) and Department of Bioengineering (N.K., K.V.S.), University of California, Berkeley, California 94720; Warwick HRI, University of Warwick, Wellesbourne, Warwick CV35 9EF, United Kingdom (M.T.); and Sainsbury Laboratory, Norwich NR4 7UH, United Kingdom (J.D.G.J.)
The tomato (Lycopersicon esculentum) Cf-9 resistance gene encodes the first characterized member of the plant receptor-like protein (RLP) family. Other RLPs such as CLAVATA2 and TOO MANY MOUTHS are known to regulate development. The domain structure of RLPs consists of extracellular leucine-rich repeats, a transmembrane helix, and a short cytoplasmic region. Here, we identify 90 RLPs in rice (Oryza sativa) and compare them with functionally characterized RLPs from different plant species and with 56 Arabidopsis (Arabidopsis thaliana) RLPs, including the downy mildew resistance protein RPP27. Many RLPs cluster into four distinct superclades, three of which include RLPs known to be involved in plant defense. Sequence comparisons reveal diagnostic amino acid residues that may specify different molecular functions in different RLP subtypes. This analysis of rice RLPs thus identified at least 73 candidate resistance genes and four genes potentially involved in development. Due to the synteny between rice and other Gramineae, this analysis should provide valuable tools for experimental studies in rice and other cereals.
1 This work was supported in part by the National Science Foundation (PECASE Award DBI0238311 to K.V.S.) and in part by the Gatsby Charitable Foundation (to J.D.G.J.).
2 These authors contributed equally to the paper.
[w] The online version of this article contains Web-only data.
www.plantphysiol.org/cgi/doi/10.1104/pp.104.054452.
* Corresponding author; e-mail kimmen{at}berkeley.edu; fax 5106429932.
Received October 5, 2004;
returned for revision February 4, 2005;
accepted March 23, 2005.
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