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Characterization and heterologous expression of a novel Co2+-dependent leucyl aminopeptidase Amp0279 originating from Lysinibacillus sphaericus

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Abstract

This study aims to explore the potential aminopeptidases of Lysinibacillus sphaericus based on the unique metabolic characteristics of this species which cannot metabolize carbohydrates and may have a strong ability to metabolize amino acids. Fifteen peptidase-encoding genes predicted in L. sphaericus C3-41 have been heterologously expressed in Escherichia coli BL21, and of these genes, only Amp0279 shows a high ability to hydrolyze L-leucine-4-nitroanilide (Leu-pNA). Phylogenetic analysis, 3D-structure modeling, and enzyme assays indicated that Amp0279 should be a novel Co2+-dependent aminopeptidase belonging to the M29 family. The optimal conditions of Amp0279 were determined to be 50 °C and pH 8.0 with the addition of 100 μM Co2+, and under this condition, the specific activity of Amp0279 matched that of Flavourzyme® (3.54 × 104 vs. 3.37 × 104 U/mg for the protein ingredient of Flavourzyme®). Amp0279 is mainly expressed in the middle sporulation phase in wild-type L. sphaericus or in Bacillus subtilis under the control of the sporulation-dependent strong promoter pcry8E, which is carried by the recombinant vector pHT315-8E21b. Furthermore, the secretory expression systems based on B. subtilis and Corynebacterium glutamicum were used to enhance the soluble expression of Amp0279. Obvious expression and enzymatic activity were detected from the crude supernatant media of both host bacteria without further concentration and purification. Moreover, expression can occur in the vegetative phase in B. subtilis under the control of the Pgrac promoter.

Key points

• A novel Co 2+ -dependent leucyl aminopeptidase Amp0279 originating from L. sphaericus was characterized.

• The activity of Amp0279 as a leucyl aminopeptidase matches that of Flavourzyme® under optimal conditions.

• B. subtilis– and C. glutamicum–based expression systems are built to promote secretory (soluble) Amp0279 expression.

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taken from WB800N (pHT315-8E21b-amp0279). + , positive control using purified Amp0279 expressed in BL21 (pET28a-amp0279). Lanes 1–8 are the samples taken at 0 h, 12 h, 24 h, 48 h, 72 h, 96 h, 120 h, and 144 h, respectively. The samples were precipitated bacterial cells treated with loading buffer

Fig. 9

taken from the supernatant of WB800N (pHT43) before and after induction. Due to the fused His_tag, the hybridization band in the positive control was larger than the expressed Amp0279 in B. subtilis. b Lanes 1 and 2 were the supernatant taken from CGMCC1.15647 (pXMJ19-5.7) and CGMCC1.15647 (pXMJ19-5.7-amp0279); lanes 3 and 4 were the supernatant after sonication and centrifugation from CGMCC1.15647 (pXMJ19-5.7) and CGMCC1.15647 (pXMJ19-5.7-amp0279); and lanes 5 and 6 were cell debris after sonication and centrifugation from CGMCC1.15647 (pXMJ19-5.7) and CGMCC1.15647 (pXMJ19-5.7-amp0279), respectively

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Acknowledgements

We thank Dr. Xiuxia Liu from Jiangnan University, China, and Dr. Puping Song from the Institute of Plant Protection, Chinese Academy of Agricultural Sciences, for kindly supplying C. glutamicum CGMCC1.15647, pXMJ19-5.7, and pHT315-8E21b.

Funding

This project was supported by the National Natural Science Foundation of China (NFSC) (32170008), Hubei Natural Science Foundation (2021CFB201), Hubei Province Innovation Major Program (2018ABA093), and “Fundamental Research Funds for the Central Universities” of South-Central University for Nationalities (CZZ20001). National Natural Science Foundation of China (NFSC),32170008,Xiaomin Hu,Hubei Natural Science Foundation,2021CFB201,Peiling Geng,Hubei Province Innovation Major Program,2018ABA093,Hairong Xiong,Fundamental Research Funds for Central Universities of South-Central University for Nationalities,CZZ20001,Xiaomin Hu

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XH and HX conceived and designed the research. PZ, MZ and XW conducted experiments. PZ and PG analyzed data. PZ and XH wrote the manuscript. All authors read and approved the manuscript.

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Correspondence to Hairong Xiong or Xiaomin Hu.

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Zhao, P., Zhang, M., Wan, X. et al. Characterization and heterologous expression of a novel Co2+-dependent leucyl aminopeptidase Amp0279 originating from Lysinibacillus sphaericus. Appl Microbiol Biotechnol 106, 1139–1149 (2022). https://doi.org/10.1007/s00253-022-11767-8

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  • DOI: https://doi.org/10.1007/s00253-022-11767-8

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