LysM1 in MmLYK2 is a motif required for the interaction of MmLYP1 and MmLYK2 in the chitin signaling

Plant Cell Reports
Zhiyuan LvNingjia He

Abstract

Two LysM-containing proteins, namely, MmLYP1 and MmLYK2, were identified in mulberry. These proteins might be involved in chitin signaling. The LysM1 of MmLYK2 is critical for their interactions. Chitin is a major component of fungal cell walls and acts as an elicitor in plant innate immunity. Lysin motif (LysM)-containing proteins are essential for chitin recognition. However, related studies have been rarely reported in woody plants. In this study, in mulberry, the expression of a LysM-containing protein, MmLYP1, was significantly up-regulated after treatment with chitin and pathogenic fungi. In addition, MmLYP1 has an affinity for insoluble chitin polymers. Thus, MmLYP1 might function in chitin signaling. Since MmLYP1 lacks an intracellular domain, additional protein kinases are required for this signaling. An LysM-containing kinase, MmLYK2, was then identified. Expression of the MmLYK2 did not change significantly after chitin treatment, and the affinity of MmLYK2 for insoluble chitin was not high. The structure of MmLYP1 is similar to that of the chitin elicitor-binding proteins in rice and Arabidopsis. However, MmLYK2 has two LysM motifs, while the chitin elicitor receptor kinase 1 proteins in rice and Arabidopsis have on...Continue Reading

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Methods Mentioned

BETA
Y2H
PCR
two-hybrid
Co
IP
pull down
coimmunoprecipitation
Co-IP
NMR

Software Mentioned

MEGA5
SMART
ClustalX

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