Mining and selecting genes encoding chitinase from DNA metagenome data

Nguyen Thi Thom, Nguyen Thi Hong Ha, Pham Bich Ngoc, Chu Hoang Ha, Ho Bich Hai, Le Mai Huong
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Authors

  • Nguyen Thi Thom Viện Công nghệ sinh học
  • Nguyen Thi Hong Ha
  • Pham Bich Ngoc
  • Chu Hoang Ha
  • Ho Bich Hai
  • Le Mai Huong

DOI:

https://doi.org/10.15625/1811-4989/17/3/13486

Keywords:

chitinase, DNA metagenome, E. coli, new gene, recombinant

Abstract

In this study, genes encoding chitinaseswere obtained by mining the rhizosphere metagenome database of
2-year-old replanted coffee trees in Dak Lak province and annotating using CAZy data. These sequences predictably are covered 90% of chitinase domains by BLASTp and range from 33% to 99% identity in comparison with published sequence data of chitinase genes. In order to find new funtional chitinase gene(s), among 8/56 chitinase genes with sequence identity less than 75%, ChiA_2 sequenceshowed the highest max score andsignificant homology (72%) was initially selected. Analysis of in silico sequence identified a protein motif for a signal peptide of 30 amino acid residues at the N- terminal using SignalP 4.1 server. By InterProscan software, the ChiA_2 gene sequence is predicted to have conserved active site FDGIDIDWE located at 134-142. The ChiA_2 sequence consisting of 1167 nucleotides, encoding for 389 amino acids with a predicted molecular mass of 43 kDa was synthesized, cloned into the pET21 a(+) vector and transformed into E. coli BL21 (DE3) by heat shock. ChiA_2 protein was specifically expressed in the recombinant E. coli BL21 (DE3) cell with an activity of 4.9 U/ml. In this study, analyzing metagenomic data from the soil sample of rhizosphere provided relatively sufficient genetic information of chitinase gene and initially successful expression and functional evaluation of ChiA_2 sequence, encoding Chitinase 2.

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Published

28-11-2020

How to Cite

Thi Thom, N., Thi Hong Ha, N., Bich Ngoc, P., Hoang Ha, C., Bich Hai, H., & Mai Huong, L. (2020). Mining and selecting genes encoding chitinase from DNA metagenome data. Vietnam Journal of Biotechnology, 17(3), 553–560. https://doi.org/10.15625/1811-4989/17/3/13486

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