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An improved molecular tool for screening bacterial colonies using GFP expression enhanced by a Dictyostelium sequence. Biotechniques 2019; 68:91-95. [PMID: 31825246 DOI: 10.2144/btn-2019-0127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
During molecular cloning, screening bacterial transformants is a time-consuming and labor-intensive process; however, tractable tools that can be applied to various vectors for visual confirmation of desired colonies are limited. Recently, we reported that translational enhancement by a Dictyostelium gene sequence (TED) boosted protein expression even without an expression inducer in Escherichia coli. Here, we demonstrate a generally applicable molecular tool using the expression of green fluorescent protein enhanced by TED. By inserting a module related to TED into the cloning site in advance, we effectively screened E. coli colonies harboring the desired plasmid functions in a prokaryote (Magnetospirillum gryphiswaldense) or eukaryote (Dictyostelium discoideum). Thus, our system represents a user-friendly technique for cloning.
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2
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Site-specific, covalent immobilization of an engineered enterokinase onto magnetic nanoparticles through transglutaminase-catalyzed bioconjugation. Colloids Surf B Biointerfaces 2019; 177:506-511. [PMID: 30818243 DOI: 10.1016/j.colsurfb.2019.02.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 02/02/2019] [Accepted: 02/08/2019] [Indexed: 12/27/2022]
Abstract
Enterokinase (EK) is one of the most popular enzymes for the in vitro cleavage of fusion proteins due to its high degree of specificity for the amino-acid sequence (Asp)4-Lys. Enzyme reusability is desirable for reducing operating costs and facilitating the industrial application of EK. In this work, we report the controlled, site-specific and covalent cross-linking of an engineered EKLC on amine-modified magnetic nanoparticles (NH2-MNPs) via microbial transglutaminase-catalyzed bioconjugation for the development of the oriented-immobilized enzyme, namely, EKLC@NH2-MNP biocatalyst. Upon the site-specific immobilization, approximately 90% EKLC enzymatic activity was retained, and the biocatalyst exhibited more than 85% of initial enzymatic activity regardless of storage or reusable stability over a month. The EKLC@NH2-MNP biocatalyst was further applied to remove the His tag-(Asp)4-Lys fusion partner from the His tag-(Asp)4-Lys-(GLP-1)3 substrate fusion protein, result suggested the EKLC@NH2-MNP possessed remarkable reusability, without a significant decrease of enzymatic activity over 10 cycles (P > 0.05). Supported by the unique properties of MNPs, the proposed EKLC@NH2-MNP biocatalyst is expected to promote the economical utilization of enterokinase in fusion protein cleavage.
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3
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Development of GFP-based high-throughput screening system for directed evolution of glucose oxidase. J Biosci Bioeng 2019; 127:30-37. [DOI: 10.1016/j.jbiosc.2018.07.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 06/26/2018] [Accepted: 07/01/2018] [Indexed: 01/15/2023]
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4
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Yu CM, Zhou H, Zhang WF, Yang HM, Tang JB. Site-specific, covalent immobilization of BirA by microbial transglutaminase: A reusable biocatalyst for in vitro biotinylation. Anal Biochem 2016; 511:10-2. [PMID: 27480497 DOI: 10.1016/j.ab.2016.07.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 07/22/2016] [Accepted: 07/28/2016] [Indexed: 11/24/2022]
Abstract
A facile approach for the production of a reusable immobilized recombinant Escherichia coli biotin ligase (BirA) onto amine-modified magnetic microspheres (MMS) via covalent cross-linking catalyzed using microbial transglutaminase (MTG) was proposed in this study. The site-specifically immobilized BirA exhibited approximately 95% of enzymatic activity of the free BirA, and without a significant loss in intrinsic activity after 10 rounds of recycling (P > 0.05). In addition, the immobilized BirA can be easily recovered from the solution via a simple magnetic separation. Thus, the immobilized BirA may be of general use for in vitro biotinylation in an efficient and economical manner.
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Affiliation(s)
- Chang-Mei Yu
- School of Pharmacy, Weifang Medical University, 261053 Weifang, China
| | - Hui Zhou
- School of Pharmacy, Weifang Medical University, 261053 Weifang, China
| | - Wei-Fen Zhang
- School of Pharmacy, Weifang Medical University, 261053 Weifang, China
| | - Hong-Ming Yang
- School of Pharmacy, Weifang Medical University, 261053 Weifang, China.
| | - Jin-Bao Tang
- School of Pharmacy, Weifang Medical University, 261053 Weifang, China.
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5
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Yang HM, Bao RM, Cheng YZ, Tang JB. Site-specific covalent attachment of an engineered Z-domain onto a solid matrix: an efficient platform for 3D IgG immobilization. Anal Chim Acta 2015; 872:1-6. [PMID: 25892064 DOI: 10.1016/j.aca.2015.03.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 02/25/2015] [Accepted: 03/02/2015] [Indexed: 12/15/2022]
Abstract
Immobilized antibodies with oriented and homogeneous patterns are crucial to solid-phase molecular recognition assay. Antibody binding protein-based immobilization can effectively present the desired antibodies. However, steadily installing the stromatoid protein with site-specific attachment manner onto a matrix surface remains to be elucidated. In this study, we present an optimal protocol to tightly attach an immunoglobulin G (IgG)-binding protein (Z-domain) through covalent incorporation of Cys-tag and maleimide group onto polystyrene surface to guarantee site-specific, oriented, and irreversible attachment, resulting in a highly efficient platform for three-dimensional IgG immobilization. The actual IgG-binding characteristic of immobilized Z-Cys was investigated by employing affinity chromatography and size exclusion chromatography. And the efficacy and potential of this platform was demonstrated by applying it to the analysis of interaction between rabbit anti-HRP IgG and its binding partner HRP. The proposed approach may be an attractive strategy to construct high performance antibody arrays and biosensors given that the antibody is compatible with the Z-domain.
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Affiliation(s)
- Hong-Ming Yang
- School of Pharmacy, Weifang Medical University, Weifang 261053, Shandong Province, China
| | - Ru-Meng Bao
- School of Pharmacy, Weifang Medical University, Weifang 261053, Shandong Province, China
| | - Yuan-Zheng Cheng
- School of Pharmacy, Weifang Medical University, Weifang 261053, Shandong Province, China
| | - Jin-Bao Tang
- School of Pharmacy, Weifang Medical University, Weifang 261053, Shandong Province, China.
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6
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Haddadi F, Aziz MA, Abdullah SNA, Tan SG, Kamaladini H. An efficient Agrobacterium-mediated transformation of strawberry cv. Camarosa by a dual plasmid system. Molecules 2015; 20:3647-66. [PMID: 25711423 PMCID: PMC6272677 DOI: 10.3390/molecules20033647] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 11/25/2014] [Indexed: 11/16/2022] Open
Abstract
An Agrobacterium-mediated transformation method was applied to introduce the luciferase reporter gene under the control of the CaMV35S promoter in the pGreen0049 binary vector into strawberry cv. Camarosa. The in vitro regeneration system of strawberry leaves to be used in the transformation was optimized using different TDZ concentrations in MS medium. TDZ at 16 µM showed the highest percentage (100%) of shoot formation and the highest mean number of shoots (24) produced per explant. Studies on the effects of different antibiotics, namely timentin, cefotaxime, carbenicillin and ampicillin, on shoot regeneration of strawberry leaf explants showed the best shoot regeneration in the presence of 300 mg/L timentin and 150 mg/L cefotaxime. Assessment of the different factors affecting Agrobacterium mediated-transformation of strawberry with the luciferase gene showed the highest efficiency of putative transformant production (86%) in the treatment with no preculture, bacterial OD600 of 0.6 and the addition of 150 mg/L cefotaxime in the pre-selection and selection media. The presence of the luciferase gene in the plant genome was verified by the luciferase reporter gene assay, nested PCR amplification and dot blot of genomic DNA isolated from the young leaves of each putatively transformed plantlet.
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Affiliation(s)
- Fatemeh Haddadi
- Department of Agriculture Technology, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
- Department of Biology, Faculty of Sciences, University of Zabol, Zabol 9861335856, Iran.
| | - Maheran Abd Aziz
- Department of Agriculture Technology, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
- Laboratory of Plantation Crops, Institute of Tropical Agriculture, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
| | - Siti Nor Akmar Abdullah
- Department of Agriculture Technology, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
- Laboratory of Plantation Crops, Institute of Tropical Agriculture, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
| | - Soon Guan Tan
- Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
| | - Hossein Kamaladini
- Department of Agriculture Technology, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
- Department of Biology, Faculty of Sciences, University of Zabol, Zabol 9861335856, Iran.
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Development of an efficient signal amplification strategy for label-free enzyme immunoassay using two site-specific biotinylated recombinant proteins. Anal Chim Acta 2015; 859:66-71. [DOI: 10.1016/j.aca.2014.12.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Revised: 12/04/2014] [Accepted: 12/09/2014] [Indexed: 01/12/2023]
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Tsuchida S, Tamura M, Hamaue N, Aoki T. Screening of recombinant Escherichia coli using activation of green fluorescent protein as an indicator. Biochem Biophys Res Commun 2014; 452:32-5. [PMID: 25139233 DOI: 10.1016/j.bbrc.2014.08.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 08/08/2014] [Indexed: 11/17/2022]
Abstract
A novel cloning vector that can be used to identify recombinant Escherichia coli colonies by activation of the green fluorescent protein gene (GFP) was constructed. Screening using the vector does not require special reagents. The recombinant plasmid activates GFP, and the rate of false-positive results is low.
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Affiliation(s)
- Shirou Tsuchida
- Department of Molecular Biosciences, School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.
| | - Mao Tamura
- Department of Molecular Biosciences, School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
| | - Naoya Hamaue
- Department of Molecular Biosciences, School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
| | - Takashi Aoki
- Department of Molecular Biosciences, School of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan
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9
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Ma Z, Luo D, Huang A, Xu Y, Wang Y, Wei Y, Liang P. pKILLIN: a versatile positive-selection cloning vector based on the toxicity of Killin in Escherichia coli. Gene 2014; 544:228-35. [PMID: 24768186 DOI: 10.1016/j.gene.2014.04.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Revised: 04/16/2014] [Accepted: 04/19/2014] [Indexed: 11/26/2022]
Abstract
The invention of DNA cloning over 40 years ago marked the advent of molecular biology. The technique has now become a routine practice in any modern biomedical laboratory. Although positive-selection of recombinants in DNA cloning seems to be superior to blue/white selection based on the disruption of the lacZ gene, it is rarely practiced due to its high background, lack of multiple cloning sites, and inability to express the genes of interest or purify the protein products. Here we report the creation of a new positive-selection cloning vector dubbed pKILLIN, which overcomes all of the above pitfalls. The essence behind its high cloning efficiency is the extreme toxicity and small size of the toxic domain of killin, a recently discovered p53 target gene. Insertion inactivation of killin within the multiple cloning site via either blunt- or sticky-end ligation not only serves as a highly efficient cloning trap, but also may allow any cloned genes to be expressed as His-tagged fusion proteins for subsequent purification. Thus, pKILLIN is a versatile positive-selection vector ideal for cloning PCR products, making DNA libraries, as well as routine cloning and bacterial expression of genes.
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Affiliation(s)
- Zelong Ma
- Center for Growth, Metabolism and Aging, School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Dan Luo
- Center for Growth, Metabolism and Aging, School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Anliang Huang
- State Key Laboratory for Gene and Cell Therapy, Sichuan University, Chengdu, China
| | - Yang Xu
- Center for Growth, Metabolism and Aging, School of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Yunxiao Wang
- Clover Biopharmaceuticals, Chengdu, China; State Key Laboratory for Gene and Cell Therapy, Sichuan University, Chengdu, China
| | - Yuquan Wei
- State Key Laboratory for Gene and Cell Therapy, Sichuan University, Chengdu, China
| | - Peng Liang
- Center for Growth, Metabolism and Aging, School of Life Sciences, Sichuan University, Chengdu 610064, China; Clover Biopharmaceuticals, Chengdu, China; State Key Laboratory for Gene and Cell Therapy, Sichuan University, Chengdu, China; GenHunter Corporation, 624 Grassmere Park, Nashville, TN 37211, USA.
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10
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Speltz EB, Regan L. White and green screening with circular polymerase extension cloning for easy and reliable cloning. Protein Sci 2013; 22:859-64. [PMID: 23592493 DOI: 10.1002/pro.2268] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 04/05/2013] [Accepted: 04/08/2013] [Indexed: 11/08/2022]
Abstract
Cloning is an essential prerequisite to test protein design and engineering ideas. However, it is often time consuming, unreliable, and therefore frustrating. Here, we present a streamlined cloning strategy that incorporates a powerful white and green screening protocol to identify colonies with inserts. We use circular polymerase extension cloning, which is both ligation and sequence independent. Furthermore, our entire procedure requires only three quick steps and one enzyme making it easy to use, inexpensive, and tractable. We anticipate that this method will be particularly useful for protein engineers who frequently subclone or make focused deletion, insertion, or substitution libraries.
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Affiliation(s)
- Elizabeth B Speltz
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut, USA
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11
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Tang JB, Sun XF, Yang HM, Zhang BG, Li ZJ, Lin ZJ, Gao ZQ. Well-oriented ZZ-PS-tag with high Fc-binding onto polystyrene surface for controlled immobilization of capture antibodies. Anal Chim Acta 2013; 776:74-8. [PMID: 23601284 DOI: 10.1016/j.aca.2013.03.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 03/01/2013] [Accepted: 03/07/2013] [Indexed: 10/27/2022]
Abstract
The site specificity and bioactivity retention of antibodies immobilized on a solid substrate are crucial requirements for solid phase immunoassays. A fusion protein between an immunoglobulin G (IgG)-binding protein (ZZ protein) and a polystyrene-binding peptide (PS-tag) was constructed, and then used to develop a simple method for the oriented immobilization of the ZZ protein onto a PS support by the specific attachment of the PS-tag onto a hydrophilic PS. The orientation of intact IgG was achieved via the interaction of the ZZ protein and the constant fragment (Fc), thereby displayed the Fab fragment for binding antigen. The interaction between rabbit IgG anti-horseradish peroxidase (anti-HRP) and its binding partner HRP was analyzed. Results showed that the oriented ZZ-PS-tag yielded an IgG-binding activity that is fivefold higher than that produced by the passive immobilization of the ZZ protein. The advantage of the proposed immunoassay strategy was demonstrated through an enzyme-linked immunosorbent assay, in which monoclonal mouse anti-goat IgG and HRP-conjugated rabbit F(ab')2 anti-goat IgG were used to detect goat IgG. The ZZ-PS-tag presented a tenfold higher sensitivity and a wider linear range than did the passively immobilized ZZ protein. The proposed approach may be an attractive strategy for a broad range of applications involving the oriented immobilization of intact IgGs onto PS supports, in which only one type of phi-PS (ZZ-PS-tag) surface is used.
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Affiliation(s)
- Jin-Bao Tang
- School of Pharmacy & Biology, Weifang Medical University, Weifang 261053, PR China.
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12
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Immobilization of unraveled immunoglobulin G using well-oriented ZZ–His protein on functionalized microtiter plate for sensitive immunoassay. Anal Biochem 2013; 432:134-8. [DOI: 10.1016/j.ab.2012.09.028] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 08/16/2012] [Accepted: 09/20/2012] [Indexed: 01/25/2023]
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13
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Comparative characterization of recombinant ZZ protein-alkaline phosphatase and its application in enzyme immunoassays. Appl Microbiol Biotechnol 2012; 97:153-8. [PMID: 22851015 DOI: 10.1007/s00253-012-4303-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2012] [Revised: 07/11/2012] [Accepted: 07/12/2012] [Indexed: 12/21/2022]
Abstract
A functional fusion protein, which consists of an antibody and an enzyme that can be used in enzyme immunoassays, has been constructed. However, a quantitative comparison of the characteristics of fusion proteins and chemical conjugates of the parents, which are functionally produced in a uniform microbial system, has not been adequately achieved. In this study, a fusion protein between the ZZ protein and Escherichia coli alkaline phosphatase (AP) and the parental ZZ protein and AP for chemical conjugate was functionally produced in the same bacterial system. A detailed examination of the ZZ-AP fusion protein and the effect of the ZZ-AP chemical conjugate on IgG affinity and enzymatic activity were performed. Compared with the parents, the equilibrium dissociation constant of ZZ-AP conjugate decreased by 32 % and catalytic activity decreased by 24 %, whereas the ZZ-AP fusion retained full parental activities and exhibited an approximately tenfold higher sensitivity than that of ZZ-AP conjugate in enzyme-linked immunosorbent assay. Thus, ZZ-AP fusion is a promising immunoreagent for IgG detection and a potential biolinker between antibodies and reporter enzymes (i.e., IgG-ZZ-AP fusion complex) in immunoassays.
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Cheong DE, Chang WS, Kim GJ. A cloning vector employing a versatile β-glucosidase as an indicator for recombinant clones. Anal Biochem 2012; 425:166-8. [PMID: 22425541 DOI: 10.1016/j.ab.2012.03.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Revised: 03/06/2012] [Accepted: 03/08/2012] [Indexed: 11/17/2022]
Abstract
A mutant glucosidase, cpGluT, with activity toward chromogenic substrates (X-gal [5-bromo-4-chloro-3-idolyl-β-d-galactoside] and indican) and a fluorogenic 4-methylumbeliferyl-β-d-glucopyranoside (MUG) was constructed by replacing the monomeric β-glucosidase region (E314-N326) with designed multiple cloning sites. When expressed in hosts (lacZ+ and lacZ-), a vector containing the cpGluT produced a colored or fluorescent phenotype according to the substrate supplemented on LB plates without any inducer. cpGluT is readily incorporable into customized vectors and does not require special hosts to detect recombinant plasmids, thereby making screening recombinants more effective and less expensive.
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Affiliation(s)
- Dea-Eun Cheong
- Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Yong-Bong Dong, Buk-Gu, Gwangju 500-757, Republic of Korea
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15
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Miura H, Inoko H, Inoue I, Tanaka M, Sato M, Ohtsuka M. Simple cloning strategy using GFPuv gene as positive/negative indicator. Anal Biochem 2011; 416:237-9. [PMID: 21601558 DOI: 10.1016/j.ab.2011.04.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Accepted: 04/28/2011] [Indexed: 10/18/2022]
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16
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Preparation of a bio-immunoreagent between ZZ affibody and enhanced green fluorescent protein for immunofluorescence applications. World J Microbiol Biotechnol 2011; 28:1281-5. [DOI: 10.1007/s11274-011-0761-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Accepted: 04/19/2011] [Indexed: 10/18/2022]
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