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E183K Mutation in Chalcone Synthase C2 Causes Protein Aggregation and Maize Colorless.
Haixiao Dong1, He Li1, Yingjie Xue1
1College of Plant Science, Jilin University, Changchun, China.
Frontiers in Plant Science
|July 12, 2021
Summary
A novel colorless maize mutant revealed that a specific mutation in chalcone synthase C2 (ZmC2) causes protein aggregation, blocking flavonoid biosynthesis. This discovery aids in understanding plant pigmentation and protein aggregation.
Area of Science:
- Plant biology
- Biochemistry
- Genetics
Background:
- Flavonoids are plant pigments crucial for physiological processes.
- A colorless maize mutant with reduced pigmentation was identified.
Purpose of the Study:
- Identify the genetic cause of the colorless maize mutant.
- Investigate the molecular mechanisms underlying the mutation's effect on flavonoid biosynthesis and protein structure.
Main Methods:
- EMS mutagenesis to create mutants.
- MutMap strategy for gene mapping.
- Transcriptomic and metabolic profiling.
- Prokaryotic, transient, and stable expression in Arabidopsis for protein analysis.
Main Results:
- A mutation (E183K) in maize chalcone synthase C2 (ZmC2) was identified as the cause of the colorless phenotype.
- The mutation led to downstream biosynthesis blockage with minimal gene expression changes.
- The E183 site on ZmC2 is highly conserved across plant species.
- Mutations at E183 caused significant protein aggregation of chalcone synthase.
Conclusions:
- The E183K mutation in ZmC2 disrupts flavonoid biosynthesis through protein aggregation.
- This study enhances understanding of flavonoid pathways and plant protein aggregation mechanisms.
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