Transcription factor PbbZIP4 is targeted for proteasome-mediated degradation by the ubiquitin ligase PbATL18 to influence pear's resistance to Colletotrichum fructicola by regulating the expression of PbNPR3.
Colletotrichum fructicola
PbATL18
PbNPR3
PbbZIP4
pear
salicylic acid
Journal
The Plant journal : for cell and molecular biology
ISSN: 1365-313X
Titre abrégé: Plant J
Pays: England
ID NLM: 9207397
Informations de publication
Date de publication:
11 2023
11 2023
Historique:
revised:
20
07
2023
received:
06
01
2023
accepted:
26
07
2023
medline:
23
10
2023
pubmed:
7
8
2023
entrez:
7
8
2023
Statut:
ppublish
Résumé
Pear anthracnose caused by Colletotrichum fructicola is one of the main fungal diseases in all pear-producing areas. The degradation of ubiquitinated proteins by the 26S proteasome is a regulatory mechanism of eukaryotes. E3 ubiquitin ligase is substrate specific and is one of the most diversified and abundant enzymes in the regulation mechanism of plant ubiquitination. Although numerous studies in other plants have shown that the degradation of ubiquitinated proteins by the 26S proteasome is closely related to plant immunity, there are limited studies on them in pear trees. Here, we found that an E3 ubiquitin ligase, PbATL18, interacts with and ubiquitinates the transcription factor PbbZIP4, and this process is enhanced by C. fructicola infection. PbATL18 overexpression in pear callus enhanced resistance to C. fructicola infection, whereas PbbZIP4 overexpression increased sensitivity to C. fructicola infection. Silencing PbATL18 and PbbZIP4 in Pyrus betulaefolia seedlings resulted in opposite effects, with PbbZIP4 silencing enhancing resistance to C. fructicola infection and PbATL18 silencing increasing sensitivity to C. fructicola infection. Using yeast one-hybrid screens, an electrophoretic mobility shift assay, and dual-luciferase assays, we demonstrated that the transcription factor PbbZIP4 upregulated the expression of PbNPR3 by directly binding to its promoter. PbNPR3 is one of the key genes in the salicylic acid (SA) signal transduction pathway that can inhibit SA signal transduction. Here, we proposed a PbATL18-PbbZIP4-PbNPR3-SA model for plant response to C. fructicola infection. PbbZIP4 was ubiquitinated by PbATL18 and degraded by the 26S proteasome, which decreased the expression of PbNPR3 and promoted SA signal transduction, thereby enhancing plant C. fructicola resistance. Our study provides new insights into the molecular mechanism of pear response to C. fructicola infection, which can serve as a theoretical basis for breeding superior disease-resistant pear varieties.
Substances chimiques
Ubiquitin
0
Proteasome Endopeptidase Complex
EC 3.4.25.1
Transcription Factors
0
Ubiquitinated Proteins
0
Ubiquitin-Protein Ligases
EC 2.3.2.27
Salicylic Acid
O414PZ4LPZ
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
903-920Informations de copyright
© 2023 Society for Experimental Biology and John Wiley & Sons Ltd.
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