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Mushtaq A, Ahmed S, Mehmood T, Cruz-Reyes J, Jamil A, Nawaz S. Cloning, Expression, and Characterization of a Metalloprotease from Thermophilic Bacterium Streptomyces thermovulgaris. BIOLOGY 2024; 13:619. [PMID: 39194556 DOI: 10.3390/biology13080619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2024] [Revised: 08/09/2024] [Accepted: 08/13/2024] [Indexed: 08/29/2024]
Abstract
Proteases hydrolyze proteins and reduce them to smaller peptides or amino acids. Besides many biological processes, proteases play a crucial in different industrial applications. A 792 bp protease gene (nprB) from the thermophilic bacterium Streptomyces thermovulgaris was cloned and expressed in E. coli BL21 using pET 50b (+). Optimal recombinant protease expression was observed at 1 mM IPTG, 37 °C for 4 h. The resulting protease was observed in soluble form. The molecular mass estimated by SDS-PAGE and Western blot analysis of the protease (NprB) fused with His and Nus tag is ~70 KDa. The protease protein was purified by Ammonium sulfate precipitation and immobilized metal ion affinity chromatography. The optimum pH and temperature for protease activity using casein as substrate were 7.2 and 70 °C, respectively. The mature protease was active and retained 80% of its activity in a broad spectrum of pH 6-8 after 4 h of incubation. Also, the half-life of the protease at 70 °C was 4 h. EDTA (5 mM) completely inhibited the enzyme, proving the isolated protease was a metalloprotease. NprB activity was enhanced in the presence of Zn2+, Mn2+, Fe2+ and Ca2+, while Hg2+ and Ni2+ decreased its activity. Exposure to organic solvents did not affect the protease activity. The recombinant protease was stable in the presence of 10% organic solvents and surfactants. Further characterization showed that zinc-metalloprotease is promising for the detergent, laundry, leather, and pharmaceutical industries.
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Affiliation(s)
- Amna Mushtaq
- Department of Medical Laboratory, Times Institute, Multan 60000, Pakistan
| | - Sibtain Ahmed
- Department of Biochemistry, Bahauddin Zakariya University, Multan 60800, Pakistan
| | - Tahir Mehmood
- Institute of Microbiology and Molecular Genetics (IMMG), University of the Punjab, Lahore 54590, Pakistan
| | - Jorge Cruz-Reyes
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA
| | - Amer Jamil
- Department of Biochemistry, University of Agriculture, Faisalabad 38040, Pakistan
| | - Shafaq Nawaz
- Department of Zoology, Government College Women University, Sialkot 51310, Pakistan
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2
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El-Sayed GM, Agwa MM, Emam MTH, Kandil H, Abdelhamid AE, Nour SA. Utilizing immobilized recombinant serine alkaline protease from Bacillus safensis lab418 in wound healing: Gene cloning, heterologous expression, optimization, and characterization. Int J Biol Macromol 2024; 270:132286. [PMID: 38735612 DOI: 10.1016/j.ijbiomac.2024.132286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 04/14/2024] [Accepted: 05/09/2024] [Indexed: 05/14/2024]
Abstract
Microbial proteases have proven their efficiency in various industrial applications; however, their application in accelerating the wound healing process has been inconsistent in previous studies. In this study, heterologous expression was used to obtain an over-yielding of the serine alkaline protease. The serine protease-encoding gene aprE was isolated from Bacillus safensis lab 418 and expressed in E. coli BL21 (DE3) using the pET28a (+) expression vector. The gene sequence was assigned the accession number OP610065 in the NCBI GenBank. The open reading frame of the recombinant protease (aprEsaf) was 383 amino acids, with a molecular weight of 35 kDa. The yield of aprEsaf increased to 300 U/mL compared with the native serine protease (SAFWD), with a maximum yield of 77.43 U/mL after optimization conditions. aprEsaf was immobilized on modified amine-functionalized films (MAFs). By comparing the biochemical characteristics of immobilized and free recombinant enzymes, the former exhibited distinctive biochemical characteristics: improved thermostability, alkaline stability over a wider pH range, and efficient reusability. The immobilized serine protease was effectively utilized to expedite wound healing. In conclusion, our study demonstrates the suitability of the immobilized recombinant serine protease for wound healing, suggesting that it is a viable alternative therapeutic agent for wound management.
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Affiliation(s)
- Ghada M El-Sayed
- Microbial Genetics Department, Biotechnology Research Institute, National Research Centre, Egypt
| | - Mona M Agwa
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Egypt
| | - Maha T H Emam
- Genetics and Cytology Department, Biotechnology Research Institute, National Research Centre, Egypt.
| | - Heba Kandil
- Polymers and Pigments Department, National Research Centre, Egypt
| | | | - Shaimaa A Nour
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Institute, National Research Centre, Egypt
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3
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Allison SD, AdeelaYasid N, Shariff FM, Abdul Rahman N. Molecular Cloning, Characterization, and Application of Organic Solvent-Stable and Detergent-Compatible Thermostable Alkaline Protease from Geobacillus thermoglucosidasius SKF4. J Microbiol Biotechnol 2024; 34:436-456. [PMID: 38044750 PMCID: PMC10940756 DOI: 10.4014/jmb.2306.06050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 10/12/2023] [Accepted: 10/30/2023] [Indexed: 12/05/2023]
Abstract
Several thermostable proteases have been identified, yet only a handful have undergone the processes of cloning, comprehensive characterization, and full exploitation in various industrial applications. Our primary aim in this study was to clone a thermostable alkaline protease from a thermophilic bacterium and assess its potential for use in various industries. The research involved the amplification of the SpSKF4 protease gene, a thermostable alkaline serine protease obtained from the Geobacillus thermoglucosidasius SKF4 bacterium through polymerase chain reaction (PCR). The purified recombinant SpSKF4 protease was characterized, followed by evaluation of its possible industrial applications. The analysis of the gene sequence revealed an open reading frame (ORF) consisting of 1,206 bp, coding for a protein containing 401 amino acids. The cloned gene was expressed in Escherichia coli. The molecular weight of the enzyme was measured at 28 kDa using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The partially purified enzyme has its highest activity at a pH of 10 and a temperature of 80°C. In addition, the enzyme showed a half-life of 15 h at 80°C, and there was a 60% increase in its activity at 10 mM Ca2+ concentration. The activity of the protease was completely inhibited (100%) by phenylmethylsulfonyl fluoride (PMSF); however, the addition of sodium dodecyl sulfate (SDS) resulted in a 20% increase in activity. The enzyme was also stable in various organic solvents and in certain commercial detergents. Furthermore, the enzyme exhibited strong potential for industrial use, particularly as a detergent additive and for facilitating the recovery of silver from X-ray film.
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Affiliation(s)
- Suleiman D Allison
- Department of Food Science and Technology, Faculty of Agriculture and Agricultural Technology, Moddibo Adama University, Yola 640230, Nigeria
| | - Nur AdeelaYasid
- Department of Biochemistry, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra, Malaysia, 43400 Serdang Selangor, Malaysia
| | - Fairolniza Mohd Shariff
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 Serdang Selangor, Malaysia
| | - Nor'Aini Abdul Rahman
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra, Malaysia, 43400 Serdang Selangor, Malaysia
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Sharma C, Salem GEM, Sharma N, Gautam P, Singh R. Thrombolytic Potential of Novel Thiol-Dependent Fibrinolytic Protease from Bacillus cereus RSA1. Biomolecules 2019; 10:E3. [PMID: 31861284 PMCID: PMC7022875 DOI: 10.3390/biom10010003] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 12/06/2019] [Accepted: 12/12/2019] [Indexed: 01/12/2023] Open
Abstract
The present study demonstrates the production and thrombolytic potential of a novel thermostable thiol-dependent fibrinolytic protease by Bacillus cereus RSA1. Statistical optimization of different parameters was accomplished with Plackett-Burman design and validated further by central composite design with 30.75 U/mL protease production. Precipitation and chromatographic approaches resulted in 33.11% recovery with 2.32-fold purification. The molecular weight of fibrinolytic protease was 40 KDa and it exhibited a broad temperature and pH stability range of 20-80 °C and pH 5-10 with utmost activity at 50 °C and pH 8, respectively. The protease retained its fibrinolytic activity in organic solvents and enhanced the activity in solutions with divalent cations (Mn2+, Zn2+, and Cu2+). The enzyme kinetics revealed Km and Vmax values of 1.093 mg/mL and 52.39 µg/mL/min, respectively, indicating higher affinity of fibrinolytic activity towards fibrin. Also, complete inhibition of fibrinolytic activity with DFP and a 2-fold increase with DTT and β-mercaptoethanol indicates its thiol-dependent serine protease nature. MALDI-TOF analysis showed 56% amino acid sequence homology with Subtilisin NAT OS = Bacillus subtilis subsp. natto. The fibrinolysis activity was compared with a commercial thrombolytic agent for its therapeutic applicability, and fibrinolytic protease was found highly significant with absolute blood clot dissolution within 4 h in in vitro conditions. The isolated fibrinolytic protease of Bacillus cereus RSA1 is novel and different from other known fibrinolytic proteases with high stability and efficacy, which might have wide medicinal and industrial application as a thrombolytic agent and in blood stain removal, respectively.
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Affiliation(s)
- Chhavi Sharma
- Amity Institute of Microbial Biotechnology, Amity University Uttar Pradesh, Noida 201313, India; (C.S.)
| | - Gad Elsayed Mohamed Salem
- Amity Institute of Microbial Biotechnology, Amity University Uttar Pradesh, Noida 201313, India; (C.S.)
- National Organization for Drug Control and Research, 51 Wezaret El-Zeraa st., Giza 12618, Egypt
| | - Neha Sharma
- Amity Institute of Microbial Biotechnology, Amity University Uttar Pradesh, Noida 201313, India; (C.S.)
| | - Prerna Gautam
- Amity Institute of Microbial Biotechnology, Amity University Uttar Pradesh, Noida 201313, India; (C.S.)
| | - Rajni Singh
- Amity Institute of Microbial Biotechnology, Amity University Uttar Pradesh, Noida 201313, India; (C.S.)
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Osire T, Yang T, Xu M, Zhang X, Li X, Niyomukiza S, Rao Z. Lys-Arg mutation improved the thermostability of Bacillus cereus neutral protease through increased residue interactions. World J Microbiol Biotechnol 2019; 35:173. [PMID: 31673794 DOI: 10.1007/s11274-019-2751-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Accepted: 10/18/2019] [Indexed: 11/26/2022]
Abstract
Neutral proteases have broad application as additives in modern laundry detergents and therefore, thermostability is an integral parameter for effective production of protein crystals. To improve thermostability, the contribution of individual residues of Bacillus cereus neutral protease was examined by site-directed mutagenesis. The Lys11Arg and Lys211Arg mutants clearly possessed improved thermostabilities (Tm were 63 and 61 °C respectively) compared to the wild-type (Tm was 60 °C). MD simulations further revealed that the mutants had low RMSD and RMSF values compared to wild-type BCN indicating increased stability of the protein structure. Lys11Arg mutant particularly possessed the lowest RMSD values due to increased residue interactions, which resulted in enhanced thermostability. The mutants also displayed strong stability to most inhibitors, organic solvents and surfactants after incubation for 1 h. This study demonstrated Lys-Arg mutation enhanced thermostability of BCN and thus provides insight for engineering stabilizing mutations with improved thermostability for related proteins.
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Affiliation(s)
- Tolbert Osire
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China
| | - Taowei Yang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China.
| | - Meijuan Xu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China
| | - Xian Zhang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China
| | - Xu Li
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China
| | - Samuel Niyomukiza
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China
| | - Zhiming Rao
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 LiHu Boulevard, Wuxi, 214122, Jiangsu, China.
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Cloning, overexpression, purification of bacteriocin enterocin-B and structural analysis, interaction determination of enterocin-A, B against pathogenic bacteria and human cancer cells. Int J Biol Macromol 2018; 116:502-512. [DOI: 10.1016/j.ijbiomac.2018.05.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 02/01/2018] [Accepted: 05/01/2018] [Indexed: 01/14/2023]
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Gomri MA, Rico-Díaz A, Escuder-Rodríguez JJ, El Moulouk Khaldi T, González-Siso MI, Kharroub K. Production and Characterization of an Extracellular Acid Protease from Thermophilic Brevibacillus sp. OA30 Isolated from an Algerian Hot Spring. Microorganisms 2018; 6:E31. [PMID: 29649122 PMCID: PMC6027330 DOI: 10.3390/microorganisms6020031] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 04/10/2018] [Accepted: 04/10/2018] [Indexed: 12/18/2022] Open
Abstract
Proteases have numerous biotechnological applications and the bioprospection for newly-thermostable proteases from the great biodiversity of thermophilic microorganisms inhabiting hot environments, such as geothermal sources, aims to discover more effective enzymes for processes at higher temperatures. We report in this paper the production and the characterization of a purified acid protease from strain OA30, a moderate thermophilic bacterium isolated from an Algerian hot spring. Phenotypic and genotypic study of strain OA30 was followed by the production of the extracellular protease in a physiologically-optimized medium. Strain OA30 showed multiple extracellular proteolytic enzymes and protease 32-F38 was purified by chromatographic methods and its biochemical characteristics were studied. Strain OA30 was affiliated with Brevibacillus thermoruber species. Protease 32-F38 had an estimated molecular weight of 64.6 kDa and was optimally active at 50 °C. It showed a great thermostability after 240 min and its optimum pH was 6.0. Protease 32-F38 was highly stable in the presence of different detergents and solvents and was inhibited by metalloprotease inhibitors. The results of this work suggest that protease 32-F38 might have interesting biotechnological applications.
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Affiliation(s)
- Mohamed Amine Gomri
- Equipe Métabolites des Extrêmophiles, Laboratoire de Recherche Biotechnologie et Qualité des Aliments (BIOQUAL), Institut de la Nutrition, de l’Alimentation et des Technologies Agro Alimentaires (INATAA), Université Frères Mentouri Constantine 1 (UFMC1), Route de Ain El Bey, 25000 Constantine, Algérie; (M.A.G.); (K.K.)
| | - Agustín Rico-Díaz
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Spain; (A.R.-D.); (J.-J.E.-R.)
| | - Juan-José Escuder-Rodríguez
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Spain; (A.R.-D.); (J.-J.E.-R.)
| | - Tedj El Moulouk Khaldi
- Laboratoire Alimentation, Nutrition et Santé (ALNUTS), Institut de la Nutrition, de l’Alimentation et des Technologies Agro Alimentaires (INATAA), Université Frères Mentouri Constantine 1 (UFMC1), Route de Ain El Bey, 25000 Constantine, Algérie;
| | - María-Isabel González-Siso
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, 15071 A Coruña, Spain; (A.R.-D.); (J.-J.E.-R.)
| | - Karima Kharroub
- Equipe Métabolites des Extrêmophiles, Laboratoire de Recherche Biotechnologie et Qualité des Aliments (BIOQUAL), Institut de la Nutrition, de l’Alimentation et des Technologies Agro Alimentaires (INATAA), Université Frères Mentouri Constantine 1 (UFMC1), Route de Ain El Bey, 25000 Constantine, Algérie; (M.A.G.); (K.K.)
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Ankaiah D, Esakkiraj P, Perumal V, Ayyanna R, Venkatesan A. Probiotic characterization of Enterococcus faecium por1: Cloning, over expression of Enterocin-A and evaluation of antibacterial, anti-cancer properties. J Funct Foods 2017. [DOI: 10.1016/j.jff.2017.09.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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9
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Salwan R, Sharma V, Pal M, Kasana RC, Yadav SK, Gulati A. Heterologous expression and structure-function relationship of low-temperature and alkaline active protease from Acinetobacter sp. IHB B 5011(MN12). Int J Biol Macromol 2017; 107:567-574. [PMID: 28916383 DOI: 10.1016/j.ijbiomac.2017.09.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 09/11/2017] [Accepted: 09/11/2017] [Indexed: 10/18/2022]
Abstract
The gene encoding protease from Acinetobacter sp. IHB B 5011(MN12) was cloned and expressed in Escherichia coli BL21(DE3). The nucleotide sequence revealed 1323bp ORF encoding 441 amino acids protein with molecular weight 47.2kDa. The phylogenetic analysis showed clustering of Alp protease with subtilisin-like serine proteases of S8 family. The amino acid sequence was comprised of N-terminal signal peptide 1-21 amino acids, pre-peptide 22-143 amino acids, peptidase S8 domain 144-434 amino acids, and pro-peptide 435-441 amino acids at C-terminus. Three constructs with signal peptide pET-Alp, without signal peptide pET-Alp1 and peptidase S8 domain pET-Alp2 were prepared for expression in E. coli BL21(DE3). The recombinant proteins Alp1 and Alp2 expressed as inclusion bodies showed ∼50kDa and ∼40kDa bands, respectively. The pre-propeptide ∼11kDa removed from Alp1 resulted in mature protein of ∼35kDa with 1738Umg-1 specific activity. The recombinant protease was optimally active at 40°C and pH 9, and stable over 10-70°C and 6-12pH. The activity at low-temperature and alkaline pH was supported by high R/(R+K) ratio, more glycine, less proline, negatively charged amino acids, less salt bridges and longer loops. These properties suggested the suitability of Alp as additive in the laundry.
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Affiliation(s)
- Richa Salwan
- Academy of Scientific and Innovative Research, New Delhi, India; CSIR-Institute of Himalayan Bioresource Technology, Palampur, 176061, India
| | - Vivek Sharma
- CSIR-Institute of Himalayan Bioresource Technology, Palampur, 176061, India
| | - Mohinder Pal
- CSIR-Institute of Himalayan Bioresource Technology, Palampur, 176061, India
| | | | - Sudesh Kumar Yadav
- CSIR-Institute of Himalayan Bioresource Technology, Palampur, 176061, India
| | - Arvind Gulati
- Academy of Scientific and Innovative Research, New Delhi, India; CSIR-Institute of Himalayan Bioresource Technology, Palampur, 176061, India.
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Maruthiah T, Palavesam A. Characterization of haloalkalophilic organic solvent tolerant protease for chitin extraction from shrimp shell waste. Int J Biol Macromol 2017; 97:552-560. [PMID: 28065749 DOI: 10.1016/j.ijbiomac.2017.01.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Revised: 12/21/2016] [Accepted: 01/04/2017] [Indexed: 10/20/2022]
Abstract
Halophilic organic solvent tolerant protease (HOSP) producing Paracoccus saliphilus APCMST-CS5 was isolated from the marine sediment samples and identified through 16S rRNA sequence analysis. P. saliphilus APCMST-CS5 registered maximum HOSP production of 1,321.70U/ml in the medium contained the most significant parameters such as shrimp shell powder (SSP), CaCl2, NaCl, and sardinella powder (SP), obtained through Placket-Burman and Response Surface Methods. HOSP was further purified to 22.68 fold purity with 29.71 U/mg specific activity and its molecular weight was 39kDa. The HOSP was stable at 60°C, 9.0 pH, 3.0M NaCl concentration and it also showed maximum activity at other tested parameters. Interestingly the purified HOSP showed better antibiofilm ability against tested pathogens. Also, the HOSP effectively deproteinized (85.64%) shrimp shell chitin which in turn maximum and exhibited higher antioxidant activity. The commercial and experimental shrimp shell chitin showed similar peak pattern in FTIR and 13C CP/MAS NMR spectral analysis.
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Affiliation(s)
- Thirumalai Maruthiah
- Centre for Marine Science and Technology, Manonmaniam Sundaranar University, Rajakkamangalam-629 502, Kanyakumari District, Tamilnadu, India
| | - Arunachalam Palavesam
- Department of Animal Science, Manonmaniam Sundaranar University, Tirunelveli 627 012, Tamilnadu, India.
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Yang Q, Wang Y, Zhang H, Xu K, Wei X, Chen J, Xu P. The solid-phase extraction of α-chymotrypsin based on a novel porous polymeric dianionic ionic liquid-coated magnetic material. RSC Adv 2017. [DOI: 10.1039/c7ra09434e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel magnetic solid-phase extraction (MSPE) method based on carboxymethylcellulose sodium modified Fe3O4 nanocomposite coated with porous polymeric dianionic ionic liquid (Fe3O4@CMC@PPDIL) was proposed and applied to extracting α-chymotrypsin.
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Affiliation(s)
- Qin Yang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
| | - Yuzhi Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
| | - Hongmei Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
| | - Kaijia Xu
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
| | - Xiaoxiao Wei
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
| | - Jing Chen
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
| | - Panli Xu
- State Key Laboratory of Chemo/Biosensing and Chemometrics
- College of Chemistry and Chemical Engineering
- Hunan University
- Changsha
- P. R. China
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Zhu F, Liu F, Wu B, He B. Efficient Extracellular Expression of Metalloprotease for Z-Aspartame Synthesis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:9631-9638. [PMID: 27966925 DOI: 10.1021/acs.jafc.6b04164] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Metalloprotease PT121 and its mutant Y114S (Tyr114 was substituted to Ser) are effective catalysts for the synthesis of Z-aspartame (Z-APM). This study presents the selection of a suitable signal peptide for improving expression and extracellular secretion of proteases PT121 and Y114S by Escherichia coli. Co-inducers containing IPTG and arabinose were used to promote protease production and cell growth. Under optimal conditions, the expression levels of PT121 and Y114S reached >500 mg/L, and the extracellular activity of PT121/Y114S accounted for 87/82% of the total activity of proteases. Surprisingly, purer protein was obtained in the supernatant, because arabinose reduced cell membrane permeability, avoiding cell lysis. Comparison of Z-APM synthesis and caseinolysis between proteases PT121 and Y114S showed that mutant Y114S presented remarkably higher activity of Z-APM synthesis and considerably lower activity of caseinolysis. The significant difference in substrate specificity renders these enzymes promising biocatalysts.
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Affiliation(s)
- Fucheng Zhu
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| | - Feng Liu
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| | - Bin Wu
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| | - Bingfang He
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
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