MKKK20 works as an upstream triple-kinase of MKK3-MPK6-MYC2 module in Arabidopsis seedling development

Ojha, Madhusmita; Verma, Deepanjali; Chakraborty, Nibedita; Pal, Abhideep; Bhagat, Prakash Kumar; Singh, Anshuman; Verma, Neetu; Sinha, Alok Krishna; Chattopadhyay, Sudip

Abstract

The mitogen-activated protein kinase (MAPK) cascade is involved in several signal transduction processes in eukaryotes. Here, we report a mechanistic function of MAP kinase kinase kinase 20 (MKKK20) in light signal transduction pathways. We show that MKKK20 acts as a negative regulator of photomorphogenic growth at various wavelengths of light. MKKK20 not only regulates the expression of light signaling pathway regulatory genes but also gets regulated by the same pathway genes. The atmyc2 mkkk20 double mutant analysis shows that MYC2 works downstream to MKKK20 in the regulation of photomorphogenic growth. MYC2 directly binds to the promoter of MKKK20 to modulate its expression. The protein-protein interaction study indicates that MKKK20 physically interacts with MYC2, and this interaction likely suppresses the MYC2-mediated promotion of MKKK20 expression. Further, the protein phosphorylation studies demonstrate that MKKK20 works as the upstream kinase of MKK3-MPK6-MYC2 module in photomorphogenesis.

Citation

Ojha, M., Verma, D., Chakraborty, N., Pal, A., Bhagat, P. K., Singh, A., …Chattopadhyay, S. (2023). MKKK20 works as an upstream triple-kinase of MKK3-MPK6-MYC2 module in Arabidopsis seedling development. iScience, 26(2), Article 106049. https://doi.org/10.1016/j.isci.2023.106049

• Journal Article Type: Article
• Acceptance Date: Jan 17, 2023
• Online Publication Date: Feb 17, 2023
• Publication Date: 2023
• Deposit Date: Oct 25, 2023
• Publicly Available Date: Oct 25, 2023
• Journal: iScience
• Publisher: Cell Press
• Peer Reviewed: Peer Reviewed
• Volume: 26
• Issue: 2
• Article Number: 106049
• DOI: https://doi.org/10.1016/j.isci.2023.106049
• Public URL: https://durham-repository.worktribe.com/output/1817681