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Adaptive Evolution of Chalcone Isomerase Superfamily in Fagaceae

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Abstract

Chalcone Isomerase (CHI) catalyzes the biosynthesis of flavonoids and secondary metabolism in plants. Currently, there is no systematic analysis of CHIs gene family in Fagaceae which is available. In this study, twenty-two CHI proteins were identified in five species of the Fagaceae family. The CHI superfamily in Fagaceae can be classified into three subfamilies and five groups using phylogenetic analysis, analysis of physicochemical properties, and structural prediction. Results indicated that serine (Ser) and isoleucine (Ile) residues determine the substrate preferred by active Type I Fagaceae CHI, and the chalcone isomerase-like (CHIL) of Fagaceae had active site residues. Adaptive analysis of CHIs showed that CHIs are subject to selection pressure. The active CHI gene of Fagaceae was located in the cytoplasm, and it had the typical gene structure of CHI and contains four exons. All the twenty-two identified CHIs had the conserved domain motif 3, and the different groups had their own structural characteristics. In the process of fatty acid binding protein (FAP) evolution to CHIL and CHI, the physical and chemical properties of proteins also had significant differences in addition to changes in protein functions.

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Funding

The project was supported by grants from the National Natural Science Foundation of China (31760221), Natural Science Foundation of Hebei Province (H2020209033), and Hebei Education Department sponsored scientific research projects (ZD2019075).

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Correspondence to Yue-Hong Long or Zhao-Bin Xing.

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No conflict of interest exists in the submission of this manuscript, and manuscript is approved by all authors for publication. We declare that the work described was original research that has not been published previously in whole or in part.

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Lin, LM., Guo, HY., Song, X. et al. Adaptive Evolution of Chalcone Isomerase Superfamily in Fagaceae. Biochem Genet 59, 491–505 (2021). https://doi.org/10.1007/s10528-020-10012-z

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  • DOI: https://doi.org/10.1007/s10528-020-10012-z

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