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Azadi MA, Hemmati R, Homaei A, Khalaji-Pirbalouty V. A psychrophilic caseinolytic aspartic protease from the freshwater amphipod Gammarus bakhteyaricus for application in milk coagulation. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2021.112536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Huang L, Wu BL, He JX, Zhang Y, Chen J, Chen XJ. Molecular characterization and functional analysis of the lysosomal cathepsin D-like gene in red swamp crayfish, Procambarus clarkii. Genome 2021; 64:1041-1051. [PMID: 34323597 DOI: 10.1139/gen-2020-0154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aspartic proteinases are one of the four families of proteinase enzymes that are widely present in living organisms. They are involved in various physiological events, such as protein degradation, development, and host defense. However, the characterization and functional roles of aspartic proteinases remain to be elucidated in crustaceans. Here, we characterized a fragment of cathepsin D-like cDNA from red swamp crayfish, Procambarus clarkii (Pc-cathepsin D-like). The open reading frame of the Pc-cathepsin D-like gene contained 1152 bp, encoding a protein of 383 amino acid residues. We also evaluated the immunological role of the Pc-cathepsin D-like gene in vivo. Spatial distribution analysis revealed that the Pc-cathepsin D-like mRNA was high in the hepatopancreas, followed by the gut, gills, and hemocytes of P. clarkii. The expression levels of the Pc-cathepsin D-like gene increased following challenge with viral (polyinosinic: polycytidylic acid) and bacterial (lipopolysaccharides, peptidoglycan) PAMPs compared with PBS injection. The suppression of the Pc-cathepsin D-like gene by RNA interference significantly increased the expression of immune-associated genes. These results showed that the Pc-cathepsin D-like gene has an essential biological role in innate immune responses because it regulates the expression of immune-associated genes.
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Affiliation(s)
- Long Huang
- Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China.,Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China
| | - Ben-Li Wu
- Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China.,Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China
| | - Ji-Xiang He
- Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China.,Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China
| | - Ye Zhang
- Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China.,Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China
| | - Jing Chen
- Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China.,Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China
| | - Xia-Jun Chen
- Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China.,Anhui Province Key Laboratory of Aquaculture & Stock Enhancement, Fisher Institute of Anhui Academy of Agricultural Sciences, Hefei, 230031, China
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Sittipol D, Rodpan S, Ajingi YS, Lohnoo T, Lerksuthirat T, Kumsang Y, Yingyong W, Khunrae P, Rattanarojpong T, Pattanapanyasat K, Jongruja N. Identification, overexpression, purification, and biochemical characterization of a novel hyperthermostable keratinase from Geoglobus acetivorans. 3 Biotech 2021; 11:2. [PMID: 33269186 DOI: 10.1007/s13205-020-02538-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 10/30/2020] [Indexed: 01/19/2023] Open
Abstract
The goal of this study was to identify and biochemically characterize a novel hyperthermostable keratinase from microorganisms for feather waste degradation. Here, a hyperthermophilic Geoglobus acetivorans keratinase (GacK) gene was chosen based on a search of a sequence database. The selected GacK gene was synthesized, cloned, and successfully expressed without a signal peptide in the E. coli system. A monomer of approximately 58 kDa was obtained in a soluble form and purified. The recombinant GacK displayed the highest activity at an optimum temperature of 100 °C and a pH of 10. The hyperthermostable GacK enzymatic performance remained high even after incubation in nonionic surfactants and the chelating agent EDTA. The residual and keratinolytic activities of GacK, as determined with azocasein and keratin azure used as substrates, remained significantly greater than 80% at 130 °C for 7 h. The kinetic parameters Km and Vmax for azure keratin were 0.41 mg/ml and 875.14 unit/mg, respectively, while those for azocasein were 1.51 mg/ml and 505.32 unit/mg, respectively. The results suggest that the enzyme is among the most hyperthermostable keratinases. Because of its enzymatic characteristics to degrade keratin azure at high temperatures, GacK may potentially be utilized in future industrial applications.
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Rojo-Arreola L, Navarrete del Toro M, Cordova-Murueta J, García-Carreño F. Techniques for protein digestion research in Decapoda: A review. Trends Food Sci Technol 2019. [DOI: 10.1016/j.tifs.2019.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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