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Eche S, Gordon ML. Recombinant expression of HIV-1 protease using soluble fusion tags in Escherichia coli: A vital tool for functional characterization of HIV-1 protease. Virus Res 2021; 295:198289. [PMID: 33418026 DOI: 10.1016/j.virusres.2020.198289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 12/23/2020] [Accepted: 12/25/2020] [Indexed: 10/22/2022]
Abstract
HIV-1 protease expression in the laboratory is demanding because of its high cytotoxicity, making it difficult to express in bacterial expression systems such as Escherichia coli. To overcome these challenges, HIV-1 protease fusion with solubility enhancing tags helps to mitigate its cytotoxic effect and drive its expression as a soluble protein. Therefore, this review focuses on the expression of bioactive HIV-1 protease using solubility-enhancing fusion tags in Escherichia coli and summarises the characteristic features of the different common fusion tags that have been used in the expression of HIV-1 protease. This review will assist researchers with their choice of protein fusion tag for HIV-1 protease expression.
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Affiliation(s)
- Simeon Eche
- School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, 4001, South Africa.
| | - Michelle L Gordon
- School of Laboratory Medicine and Medical Sciences, University of KwaZulu-Natal, Durban, 4001, South Africa.
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2
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Kondo T, Yumura S. Strategies for enhancing gene expression in Escherichia coli. Appl Microbiol Biotechnol 2020; 104:3825-3834. [PMID: 32125482 DOI: 10.1007/s00253-020-10430-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 01/27/2020] [Accepted: 02/03/2020] [Indexed: 02/07/2023]
Abstract
Regulation of gene expression is fundamental for cellular function. Upon manipulation of the mechanism of gene expression in Escherichia coli, various bioproducts have been developed that are valuable industrially and medically in the last four decades. To efficiently produce bioproducts, numerous molecular tools are used for enhancing expression at the transcriptional and translational levels. Our recent discovery identified a new approach that enhances the gene expression in E. coli using the gene sequence of the eukaryote, Dictyostelium discoideum. In this review, we highlight the current molecular strategies used for high-level gene expression techniques commonly utilized in basic and applied microbiology.
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Affiliation(s)
- Tomo Kondo
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, 153-8902, Japan.
| | - Shigehiko Yumura
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, 753-8512, Japan
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3
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Production of Lysostaphin by Nonproprietary Method Utilizing a Promoter from Toxin–Antitoxin System. Mol Biotechnol 2019; 61:774-782. [DOI: 10.1007/s12033-019-00203-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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4
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Efficient genetic approaches for improvement of plasmid based expression of recombinant protein in Escherichia coli : A review. Process Biochem 2017. [DOI: 10.1016/j.procbio.2017.01.026] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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5
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Nguyen HLT, Nguyen TT, Vu QT, Le HT, Pham Y, Trinh PL, Bui TP, Phan TN. An efficient procedure for the expression and purification of HIV-1 protease from inclusion bodies. Protein Expr Purif 2015; 116:59-65. [PMID: 26231073 DOI: 10.1016/j.pep.2015.07.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 07/24/2015] [Accepted: 07/26/2015] [Indexed: 11/18/2022]
Abstract
Several studies have focused on HIV-1 protease for developing drugs for treating AIDS. Recombinant HIV-1 protease is used to screen new drugs from synthetic compounds or natural substances. However, large-scale expression and purification of this enzyme is difficult mainly because of its low expression and solubility. In this study, we constructed 9 recombinant plasmids containing a sequence encoding HIV-1 protease along with different fusion tags and examined the expression of the enzyme from these plasmids. Of the 9 plasmids, pET32a(+) plasmid containing the HIV-1 protease-encoding sequence along with sequences encoding an autocleavage site GTVSFNF at the N-terminus and TEV plus 6× His tag at the C-terminus showed the highest expression of the enzyme and was selected for further analysis. The recombinant protein was isolated from inclusion bodies by using 2 tandem Q- and Ni-Sepharose columns. SDS-PAGE of the obtained HIV-1 protease produced a single band of approximately 13 kDa. The enzyme was recovered efficiently (4 mg protein/L of cell culture) and had high specific activity of 1190 nmol min(-1) mg(-1) at an optimal pH of 4.7 and optimal temperature of 37 °C. This procedure for expressing and purifying HIV-1 protease is now being scaled up to produce the enzyme on a large scale for its application.
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Affiliation(s)
- Hong-Loan Thi Nguyen
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Thuy Thi Nguyen
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Quy Thi Vu
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Hang Thi Le
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Yen Pham
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Phuong Le Trinh
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Thuan Phuong Bui
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam
| | - Tuan-Nghia Phan
- Key Laboratory of Enzyme and Protein Technology, VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Hanoi, Viet Nam.
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Böttcher J, Blum A, Dörr S, Heine A, Diederich WE, Klebe G. Targeting the open-flap conformation of HIV-1 protease with pyrrolidine-based inhibitors. ChemMedChem 2008; 3:1337-44. [PMID: 18720485 DOI: 10.1002/cmdc.200800113] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
HIV protease is a well-established drug target in antiviral chemotherapy. Immense research efforts have been made to discover effective inhibitors, thus making the enzyme one of the most studied and best characterized proteins. Although the protease exhibits high flexibility, all approved drugs target virtually the same protein conformation. The development of viral cross-resistance demands the generation of inhibitors with novel scaffolds and deviating modes of binding. Herein we report the design and the short, high-yielding stereoselective synthesis of a series of chiral, symmetric pyrrolidine-based inhibitors targeting the open-flap conformation of the protease. The obtained co-crystal structure with one derivative provides a valuable starting point for further inhibitor design.
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Affiliation(s)
- Jark Böttcher
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
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Structural and Kinetic Analysis of Pyrrolidine-Based Inhibitors of the Drug-Resistant Ile84Val Mutant of HIV-1 Protease. J Mol Biol 2008; 383:347-57. [DOI: 10.1016/j.jmb.2008.07.062] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2008] [Revised: 07/22/2008] [Accepted: 07/24/2008] [Indexed: 11/17/2022]
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8
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Blum A, Böttcher J, Sammet B, Luksch T, Heine A, Klebe G, Diederich WE. Achiral oligoamines as versatile tool for the development of aspartic protease inhibitors. Bioorg Med Chem 2008; 16:8574-86. [DOI: 10.1016/j.bmc.2008.08.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Revised: 07/29/2008] [Accepted: 08/04/2008] [Indexed: 10/21/2022]
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9
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Blum A, Böttcher J, Heine A, Klebe G, Diederich WE. Structure-Guided Design of C2-Symmetric HIV-1 Protease Inhibitors Based on a Pyrrolidine Scaffold. J Med Chem 2008; 51:2078-87. [DOI: 10.1021/jm701142s] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andreas Blum
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Jark Böttcher
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Andreas Heine
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Gerhard Klebe
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
| | - Wibke E. Diederich
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
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Brass S, Chan NS, Gerlach C, Luksch T, Böttcher J, Diederich WE. Synthesis of 2,3,4,7-tetrahydro-1H-azepines as privileged ligand scaffolds for the design of aspartic protease inhibitors via a ring-closing metathesis approach. J Organomet Chem 2006. [DOI: 10.1016/j.jorganchem.2006.09.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Specker E, Böttcher J, Brass S, Heine A, Lilie H, Schoop A, Müller G, Griebenow N, Klebe G. Unexpected novel binding mode of pyrrolidine-based aspartyl protease inhibitors: design, synthesis and crystal structure in complex with HIV protease. ChemMedChem 2006; 1:106-17. [PMID: 16892342 DOI: 10.1002/cmdc.200500008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
At present nine FDA-approved HIV protease inhibitors have been launched to market, however rapid drug resistance arising under antiviral therapy calls upon novel concepts. Possible strategies are the development of ligands with less peptide-like character or the stabilization of a new and unexpected binding-competent conformation of the protein through a novel ligand-binding mode. Our rational design of pyrrolidinedimethylene diamines was inspired by the idea to incorporate key structural elements from classical peptidomimetics with a non-peptidic heterocyclic core comprising an endocyclic amino function to address the catalytic aspartic acid side chains of Asp 25 and 25'. The basic scaffolds were decorated by side chains already optimized for the recognition pockets of HIV protease or cathepsin D. A multistep synthesis has been established to produce the central heterocycle and to give flexible access to side chain decorations. Depending on the substitution pattern of the pyrrolidine moiety, single-digit micromolar inhibition of HIV-1 protease and cathepsin D has been achieved. Successful design is suggested in agreement with our modelling concepts. The subsequently determined crystal structure with HIV protease shows that the pyrrolidine moiety binds as expected to the pivotal position between both aspartic acid side chains. However, even though the inhibitors have been equipped symmetrically by polar acceptor groups to address the flap water molecule, it is repelled from the complex, and only one direct hydrogen bond is formed to the flap. A strong distortion of the flap region is detected, leading to a novel hydrogen bond which cross-links the flap loops. Furthermore, the inhibitor addresses only three of the four available recognition pockets. It achieves only an incomplete desolvation compared with the similarly decorated amprenavir. Taking these considerations into account it is surprising that the produced pyrrolidine derivatives achieve micromolar inhibition and it suggests extraordinary potency of the new compound class. Most likely, the protonated pyrrolidine moiety experiences strong enthalpic interactions with the enzyme through the formation of two salt bridges to the aspartic acid side chains. This might provide challenging opportunities to combat resistance of the rapidly mutating virus.
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Affiliation(s)
- Edgar Specker
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany
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12
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Weik S, Luksch T, Evers A, Böttcher J, Sotriffer CA, Hasilik A, Löffler HG, Klebe G, Rademann J. The potential of P1 site alterations in peptidomimetic protease inhibitors as suggested by virtual screening and explored by the use of C-C-coupling reagents. ChemMedChem 2006; 1:445-57. [PMID: 16892380 DOI: 10.1002/cmdc.200500027] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A synthetic concept is presented that allows the construction of peptide isostere libraries through polymer-supported C-acylation reactions. A phosphorane linker reagent is used as a carbanion equivalent; by employing MSNT as a coupling reagent, the C-acylation can be conducted without racemization. Diastereoselective reduction was effected with L-selectride. The reagent linker allows the preparation of a norstatine library with full variation of the isosteric positions including the P1 side chain that addresses the protease S1 pocket. Therefore, the concept was employed to investigate the P1 site specificity of peptide isostere inhibitors systematically. The S1 pocket of several aspartic proteases including plasmepsin II and cathepsin D was modeled and docked with approximately 500 amino acid side chains. Inspired by this virtual screen, a P1 site mutation library was designed, synthesized, and screened against three aspartic proteases (plasmepsin II, HIV protease, and cathepsin D). The potency of norstatine inhibitors was found to depend strongly on the P1 substituent. Large, hydrophobic residues such as biphenyl, 4-bromophenyl, and 4-nitrophenyl enhanced the inhibitory activity (IC50) by up to 70-fold against plasmepsin II. In addition, P1 variation introduced significant selectivity, as up to 9-fold greater activity was found against plasmepsin II relative to human cathepsin D. The active P1 site residues did not fit into the crystal structure; however, molecular dynamics simulation suggested a possible alternative binding mode.
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Affiliation(s)
- Steffen Weik
- Leibniz Institute for Molecular Pharmacology (FMP), and Free University Berlin, Takustrasse 3, 14195 Berlin, Germany
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13
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Specker E, Böttcher J, Heine A, Sotriffer CA, Lilie H, Schoop A, Müller G, Griebenow N, Klebe G. Hydroxyethylene Sulfones as a New Scaffold To Address Aspartic Proteases: Design, Synthesis, and Structural Characterization. J Med Chem 2005; 48:6607-19. [PMID: 16220977 DOI: 10.1021/jm050224y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydroxyethylene sulfones were developed as novel scaffolds against aspartyl proteases. A diastereoselective synthesis has been established to introduce the required side chain decoration with desired stereochemistry. Depending on the substitution of the hydroxyethylene sulfone core, micro- to submicromolar inhibition of HIV-1 protease is achieved for the S-configuration at P1 and R-configuration at the hydroxy-group-bearing backbone atom. This stereochemical preference is consistent with the S,R configuration of amprenavir. The racemic mixture of the most potent derivative (K(i) = 80 nM) was separated by chiral HPLC, revealing the S,R,S-enantiomer to be more active (K(i) = 45 nM). Docking studies suggested this isomer as the more active one. The subsequently determined crystal structure with HIV-1 protease, cocrystallized from a racemic mixture, exclusively reveals the S,R,S-enantiomer accommodated to the binding pocket. The transition state mimicking hydroxy group of the inhibitor is centered between both catalytic aspartates, while either its carbonyl or sulfonyl group forms H-bonds to the structurally conserved water mediating interactions between ligand and Ile50NH/Ile50NH' of both flaps. Biological testing of the stereoisomeric hydroxyethylene sulfones against cathepsin D and beta-secretase did not reveal significant inhibition. Most likely, the latter proteases require inverted configuration at the hydroxy group.
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Affiliation(s)
- Edgar Specker
- Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, D-35032 Marburg, Germany
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14
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Prüss BM, Markovic D, Matsumura P. The Escherichia coli flagellar transcriptional activator flhD regulates cell division through induction of the acid response gene cadA. J Bacteriol 1997; 179:3818-21. [PMID: 9171439 PMCID: PMC179187 DOI: 10.1128/jb.179.11.3818-3821.1997] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
FlhD is a positive regulator of cadA. A mutant with a transposon-mediated lacZ fusion to cadA exhibited a cell division phenotype similar to that of the flhD mutant and had FlhD-dependent beta-galactosidase activity. Under different growth conditions, the cell division rate correlated with the level of expression of cadA.
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Affiliation(s)
- B M Prüss
- Department of Microbiology and Immunology, University of Illinois at Chicago, 60612-7344, USA.
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Bäckbro K, Löwgren S, Osterlund K, Atepo J, Unge T, Hultén J, Bonham NM, Schaal W, Karlén A, Hallberg A. Unexpected binding mode of a cyclic sulfamide HIV-1 protease inhibitor. J Med Chem 1997; 40:898-902. [PMID: 9083478 DOI: 10.1021/jm960588d] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Two cyclic, C2-symmetric HIV-1 protease inhibitors, one sulfamide and one urea derivative, both comprising phenyl ether groups in the P1/P1' positions, were cocrystallized with HIV-1 protease, and the crystal structures were determined to 2.0 A resolution. The structure of the urea 2 showed a conformation similar to that reported for the related urea 3 by Lam et al., while the sulfamide 1 adopted an unanticipated conformation in which the P1' and P2' side chains were transposed.
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Affiliation(s)
- K Bäckbro
- Department of Molecular Biology, Uppsala University, Sweden
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Abstract
Progress in our understanding of several biological processes promises to broaden the usefulness of Escherichia coli as a tool for gene expression. There is an expanding choice of tightly regulated prokaryotic promoters suitable for achieving high-level gene expression. New host strains facilitate the formation of disulfide bonds in the reducing environment of the cytoplasm and offer higher protein yields by minimizing proteolytic degradation. Insights into the process of protein translocation across the bacterial membranes may eventually make it possible to achieve robust secretion of specific proteins into the culture medium. Studies involving molecular chaperones have shown that in specific cases, chaperones can be very effective for improved protein folding, solubility, and membrane transport. Negative results derived from such studies are also instructive in formulating different strategies. The remarkable increase in the availability of fusion partners offers a wide range of tools for improved protein folding, solubility, protection from proteases, yield, and secretion into the culture medium, as well as for detection and purification of recombinant proteins. Codon usage is known to present a potential impediment to high-level gene expression in E. coli. Although we still do not understand all the rules governing this phenomenon, it is apparent that "rare" codons, depending on their frequency and context, can have an adverse effect on protein levels. Usually, this problem can be alleviated by modification of the relevant codons or by coexpression of the cognate tRNA genes. Finally, the elucidation of specific determinants of protein degradation, a plethora of protease-deficient host strains, and methods to stabilize proteins afford new strategies to minimize proteolytic susceptibility of recombinant proteins in E. coli.
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Affiliation(s)
- S C Makrides
- Department of Molecular Biology, T Cell Sciences, Inc., Needham, Massachusetts 02194, USA
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McCall JO, Kadam S, Katz L. A high capacity microbial screen for inhibitors of human rhinovirus protease 3C. Nat Biotechnol 1994; 12:1012-6. [PMID: 7765405 PMCID: PMC7097487 DOI: 10.1038/nbt1094-1012] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/1994] [Accepted: 07/26/1994] [Indexed: 01/27/2023]
Abstract
We have developed a high capacity screen for compounds that inhibit the 3C protease of human rhinovirus-1b. The assay uses a recombinant strain of Escherichia coli expressing both the protease and a tetracycline resistance-conferring protein modified to contain the minimal protease cleavage site. Cultures growing in microtiter plates containing tetracycline are treated with potential inhibitors and simultaneously monitored for change in growth over time using an oxygen probe. Most of the cultures, not containing an inhibitor of the 3C protease, show reduced growth due to cleavage of the essential gene product; normal growth is seen only in the infrequent culture that contains an inhibitor. In the present example, we have used the tetA gene of plasmid pACYC184 as the modified gene. The system has been validated using inhibitors of protease 3C, and has been used to identify three new inhibitors of the enzyme, active in the micromolar range.
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Affiliation(s)
- J. Owen McCall
- Pharmaceutical Products Division, Abbott Laboratories, Abbott Park, IL 60064
| | - Sunil Kadam
- Pharmaceutical Products Division, Abbott Laboratories, Abbott Park, IL 60064
| | - Leonard Katz
- Pharmaceutical Products Division, Abbott Laboratories, Abbott Park, IL 60064
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18
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Affiliation(s)
- J Stebbins
- Department of Molecular Genetics, Smihkline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406
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