Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (6): 1114-1123.DOI: 10.3969/j.issn.1004-1524.2022.06.02

• Crop Science • Previous Articles     Next Articles

Codon bias of IPI gene in leguminous plants

JIANG Ruiping(), ZHAO Chenhui, LI Wenjie, AN Qiuju, LI Jialun, ZHOU Jiayu, LI Suiyan, LIAO Hai()   

  1. School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2021-08-30 Online:2022-06-25 Published:2022-06-30
  • Contact: LIAO Hai

Abstract:

Isopentenyl diphosphate isomerases (IPI), as a key enzyme in 2-C-methyl-D-erythritol 4-phosphate (MEP) and Mevalonate (MVA) pathways, takes part in the biosynthesis of terpenoids. Since leguminous species contain a variety of terpenoids, the codon bias of IPI genes from leguminous species will provide significant basis to increase those expressing levels and thus the terpenoids contents in leguminous species. In this study, Codon W, EMBOSS, ENc-GC3s and PR2-plot were used to calculate the base composition, relative synonymous codon usage (RSCU), effective number of codons (ENc), codon adaptation index (CAI), and etc. As a result, 7 codons showed strong preference (RSCU >1), in which GGU was the most optimal codon. That the low contents (<0.5) of both GC (GC content) and GC3s (GC content of the third base) indicated that A/U was preferable terminal codon. The low expressing level of IPI genes was probably due to the Enc values ranging from 46.69 to 55 and the CAI values ranging from 0.23 to 0.27. The results of ENc-GC3s and PR2-plot supported that the formation of codon bias was mainly contributed from natural selection. Compared with RSCU clustering, the phylogenetic tree based on CDS was closer to the result of classification based on morphology. Finally, Escherichia coli, Nicotiana tabacum and Arabidopsis thaliana were proposed to be suitable hosts for IPI genes from leguminous species. Therefore, the result of this paper laid foundation for transformation of codons and genetic engineering of IPI genes.

Key words: codon usage bias, cluster analysis, isopentenyl diphosphate isomerases, leguminous plants

CLC Number: