TY - JOUR
T1 - Dynamics of ribosome composition and ribosomal protein phosphorylation in immune signaling in Arabidopsis thaliana
AU - Siodmak, Anna
AU - Martinez-Seidel, Federico
AU - Rayapuram, Naganand
AU - Bazin, Jeremie
AU - Alhoraibi, Hanna
AU - Gentry-Torfer, Dione
AU - Tabassum, Naheed
AU - Sheikh, Arsheed H.
AU - Kise, José Kenyi González
AU - Blilou, Ikram
AU - Crespi, Martin
AU - Kopka, Joachim
AU - Hirt, Heribert
N1 - Publisher Copyright:
© 2023 The Author(s). Published by Oxford University Press on behalf of Nucleic Acids Research.
PY - 2023/11/27
Y1 - 2023/11/27
N2 - In plants, the detection of microbe-associated molecular patterns (MAMPs) induces primary innate immunity by the activation of mitogen-activated protein kinases (MAPKs). We show here that the MAMP-activated MAPK MPK6 not only modulates defense through transcriptional regulation but also via the ribosomal protein translation machinery. To understand the effects of MPK6 on ribosomes and their constituent ribosomal proteins (RPs), polysomes, monosomes and the phosphorylation status of the RPs, MAMP-treated WT and mpk6 mutant plants were analysed. MAMP-activation induced rapid changes in RP composition of monosomes, polysomes and in the 60S ribosomal subunit in an MPK6-specific manner. Phosphoproteome analysis showed that MAMP-activation of MPK6 regulates the phosphorylation status of the P-stalk ribosomal proteins by phosphorylation of RPP0 and the concomitant dephosphorylation of RPP1 and RPP2. These events coincide with a significant decrease in the abundance of ribosome-bound RPP0s, RPP1s and RPP3s in polysomes. The P-stalk is essential in regulating protein translation by recruiting elongation factors. Accordingly, we found that RPP0C mutant plants are compromised in basal resistance to Pseudomonas syringae infection. These data suggest that MAMP-induced defense also involves MPK6-induced regulation of P-stalk proteins, highlighting a new role of ribosomal regulation in plant innate immunity.
AB - In plants, the detection of microbe-associated molecular patterns (MAMPs) induces primary innate immunity by the activation of mitogen-activated protein kinases (MAPKs). We show here that the MAMP-activated MAPK MPK6 not only modulates defense through transcriptional regulation but also via the ribosomal protein translation machinery. To understand the effects of MPK6 on ribosomes and their constituent ribosomal proteins (RPs), polysomes, monosomes and the phosphorylation status of the RPs, MAMP-treated WT and mpk6 mutant plants were analysed. MAMP-activation induced rapid changes in RP composition of monosomes, polysomes and in the 60S ribosomal subunit in an MPK6-specific manner. Phosphoproteome analysis showed that MAMP-activation of MPK6 regulates the phosphorylation status of the P-stalk ribosomal proteins by phosphorylation of RPP0 and the concomitant dephosphorylation of RPP1 and RPP2. These events coincide with a significant decrease in the abundance of ribosome-bound RPP0s, RPP1s and RPP3s in polysomes. The P-stalk is essential in regulating protein translation by recruiting elongation factors. Accordingly, we found that RPP0C mutant plants are compromised in basal resistance to Pseudomonas syringae infection. These data suggest that MAMP-induced defense also involves MPK6-induced regulation of P-stalk proteins, highlighting a new role of ribosomal regulation in plant innate immunity.
UR - http://www.scopus.com/inward/record.url?scp=85178499203&partnerID=8YFLogxK
U2 - 10.1093/nar/gkad827
DO - 10.1093/nar/gkad827
M3 - Article
C2 - 37823590
AN - SCOPUS:85178499203
SN - 0305-1048
VL - 51
SP - 11876
EP - 11892
JO - NUCLEIC ACIDS RESEARCH
JF - NUCLEIC ACIDS RESEARCH
IS - 21
ER -