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Plant Cell, Vol. 13, 273-285, February 2001, Copyright © 2001, American Society of Plant Physiologists

Identification of Distinct Specificity Determinants in Resistance Protein Cf-4 Allows Construction of a Cf-9 Mutant That Confers Recognition of Avirulence Protein AVR4

Renier A. L. Van der Hoorna, Ronelle Rotha, and Pierre J. G. M. De Wita
a Laboratory of Phytopathology, Wageningen University, 6709 PD Wageningen, The Netherlands

Correspondence to: Pierre J. G. M. De Wit, pierre.dewit{at}fyto.dpw.wag-ur.al (E-mail), 31-317-483412 (fax)

The tomato resistance genes Cf-4 and Cf-9 confer specific, hypersensitive response–associated recognition of Cladosporium carrying the avirulence genes Avr4 and Avr9, respectively. Cf-4 and Cf-9 encode type I transmembrane proteins with extracellular leucine-rich repeats (LRRs). Compared with Cf-9, Cf-4 lacks two LRRs and differs in 78 amino acid residues. To investigate the relevance of these differences for specificity, we exchanged domains between Cf-4 and Cf-9, and mutant constructs were tested for mediating the hypersensitive response by transient coexpression with either Avr4 or Avr9. We show that the number of LRRs is essential for both Cf-4 and Cf-9 function. In addition, Cf-9 specificity resides entirely in the LRR domain and appears to be distributed over several distant LRRs. In contrast, Cf-4 specificity determinants reside in the N-terminal LRR-flanking domain and three amino acid residues in LRRs 13, 14, and 16. These residues are present at putative solvent-exposed positions, and all are required for full Cf-4 function. Finally, we show that Cf-9 carrying the specificity determinants of Cf-4 has recognitional specificity for AVR4. The data indicate that diversifying selection of solvent-exposed residues has been a more important factor in the generation of Cf-4 specificity than has sequence exchange between Cf-4 progenitor genes. The fact that most variant residues in Cf-4 are not essential for Cf-4 specificity indicates that the diverse decoration of R proteins is not fully adapted to confer recognition of a certain avirulence determinant but likely provides a basis for a versatile, adaptive recognition system.




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