Abstract
Tomato Cf- 9, a receptor-like protein (RLP), confers resistance to races of the fungal pathogen Cladosporium fulvum that express the Avr9 avirulence gene. CITRX ( Cf-9- interacting thio redo xin) was previously identified in a yeast two-hybrid screen as a protein interacting with the cytoplasmic domain of Cf-9 and shown to be a negative regulator of the cell death induced after Cf-9/Avr9 interaction. ACIK1 is a Ser/Thr protein kinase that is specifically required for the Cf- 9 and Cf- 4 dependent defence response in tomato. In this paper we present data suggesting that CITRX may act as an adaptor recruiting the ACIK1 kinase to the cytoplasmic domain of Cf-9 upon elicitation with the Avr9 peptide. Interestingly, the catalytic activities of both CITRX and ACIK1 are not required for their interaction.
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