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Figure 3
The systemin receptor, SR160, is an LRR receptor kinase identical to BRI1 in tomato. The extracellular domain is composed of 25 leucine rich repeats (LRR) separated at the twenty-first and twenty-second LRR by a non-LRR region of 68 amino acids, followed by an intracellular Ser/Thr kinase domain preceding a single membrane spanning domain. The receptor protein is involved in plant defense in response to the polypeptide hormone systemin, and regulates development in response to the steroid hormone brassinolide.
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