JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (4): 79-85.doi: 10.3969/j.issn.1000-2006.201912007

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The cloning and expression analysis of mevalonate pyrophosphate decarboxylase gene cDNA sequence from Sanghuangporus baumii

LIU Zengcai1(), SUN Tingting2, WANG Shixin1, MA Yisha1, WANG Xutong1, SUN Jian1, ZOU Li1()   

  1. 1.College of Forestry, Northeast Forestry University, Harbin 150040, China
    2.Department of Food Engineering, Harbin University, Harbin 150086, China
  • Received:2019-12-04 Revised:2020-02-27 Online:2020-07-22 Published:2020-08-13
  • Contact: ZOU Li E-mail:1758458181@qq.com;13903650896@163.com

Abstract: Objective

To clone and characterize a mevalonate pyrophosphate decarboxylase (MVD) gene involved in the triterpenoids biosynthesis pathway in Sanghuangporus baumii is to understand the regulation mechanism of the triterpenoids biosynthesis pathway.

Method

The characteristics of the MVD gene sequence were determined using a series of bioinformatic tools. The prokaryotic expression vector was constructed using homologous recombination. Moreover, qRT-PCR was performed to measure the MVD gene transcript level, and spectrophotometry was used to determine the content and variation of triterpenoids at different developmental stages of S. baumii.

Result

The sequence analysis showed that the MVD gene cDNA sequence length was 1 209 bp and encoded 402 amino acids. The molecular weight of the protein was predicted to be 43.43 ku, and it was named SbMVD (GenBank number MK977617). Amino acid sequence alignment revealed that the SbMVD protein shared the greatest homology with Ganoderma sinense and Grifola frondosa. SDS-PAGE electrophoresis showed that the target protein band was located at approximately 65 ku (including a 21 ku tag protein), which was consistent with the predicted protein. Furthermore, qRT-PCR and spectrophotometry results showed that the SbMVD gene transcript level and triterpenoids content increased before decreasing dynamically at different developmental stages. The variation trends were basically the same.

Conclusion

The cloning and analysis of the SbMVD gene indicated that it might play an important role in the triterpenoids biosynthesis pathway. Our results lay a foundation for further elucidating the triterpenoids biosynthesis function of the SbMVD gene in S. baumii.

Key words: Sanghuangporus baumii, mevalonate pyrophosphate decarboxylase, gene cloning, bioinformatic analysis, expression analysis

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