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Heterologous expression of nattokinase in E. coli: Biochemical characterization and functional analysis of fibrin binding residues.
Jain, Ankush; Sondhi, Nishi; Singh, Kashmir; Kaur, Jagdeep.
Afiliación
  • Jain A; Department of Biotechnology, BMS Block-1, Panjab University, Sector 25, Chandigarh, India. Electronic address: Ajankushjain05@gmail.com.
  • Sondhi N; Department of Biotechnology, BMS Block-1, Panjab University, Sector 25, Chandigarh, India. Electronic address: nishisondhi2018@gmail.com.
  • Singh K; Department of Biotechnology, BMS Block-1, Panjab University, Sector 25, Chandigarh, India. Electronic address: Kashmirbio@pu.ac.in.
  • Kaur J; Department of Biotechnology, Sector-25, Panjab University, Chandigarh, 160014, India. Electronic address: jagsekhon@pu.ac.in.
Arch Biochem Biophys ; 757: 110026, 2024 Jul.
Article en En | MEDLINE | ID: mdl-38718957
ABSTRACT
Heterologous expression of nattokinase, a potent fibrinolytic enzyme, has been successfully carried out in various microorganisms. However, the successful expression of this enzyme as a soluble protein was not achieved in E. coli. This study delves into the expression of nattokinase in E. coli as a soluble protein followed by its biochemical characterization and functional analysis for fibrinolytic activity. E. coli BL21C41 and pET32a vector host strain with pGro7 protein chaperone induced with IPTG at 16 °C 180 rpm for 16 h enabled the production of recombinant nattokinase in soluble fraction. Enzymatic assays demonstrated its protease activity, while characterization revealed optimal catalytic conditions at 37 °C and pH 8.0, with remarkable stability over a broad pH range (6.0-10.0) and up to 50 °C. The kinetic constants were determined as follows Km = 25.83 ± 3.43 µM, Vmax = 62.91 ± 1.68 µM/s, kcat = 38.45 ± 1.06 s-1, and kcat/Km = 1.49 × 106 M-1 s-1. In addition, the fibrinolytic activity of NK, quantified by the fibrin plate hydrolysis assay was 1038 ± 156 U/ml, with a corresponding specific activity of 1730 ± 260 U/mg and the assessment of clot lysis time on an artificial clot (1 mg) was found to be 51.5 ± 2.5 min unveiling nattokinase's fibrinolytic potential. Through molecular docking, a substantial binding energy of -6.46 kcal/mol was observed between nattokinase and fibrin, indicative of a high binding affinity. Key fibrin binding residues, including Ser300, Leu302, and Asp303, were identified and confirmed. These mutants affected specifically the fibrin binding and not the proteolytic activity of NK. This comprehensive study provides crucial conditions for the expression of protein in soluble form in E. coli and biochemical properties paving the way for future research and potential applications in medicine and biotechnology.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Proteínas Recombinantes / Fibrina / Subtilisinas / Escherichia coli Idioma: En Revista: Arch Biochem Biophys Año: 2024 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Proteínas Recombinantes / Fibrina / Subtilisinas / Escherichia coli Idioma: En Revista: Arch Biochem Biophys Año: 2024 Tipo del documento: Article Pais de publicación: Estados Unidos