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Special Issue "Heterologous Expression of Difficult to Produce Proteins in Bacterial Systems"

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Microbiology".

Deadline for manuscript submissions: closed (30 November 2019).

Special Issue Editors

Dr. Elena Garcia-Fruitos
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Guest Editor
Department of Ruminant Production, Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Torre Marimon, 08140 Caldes de Montbui, Barcelona, Spain
Interests: recombinant protein; protein aggregation; protein nanoparticles; nanobiotechnology; microbiology; inclusion bodies; animal production; antimicrobial proteins; immunomodulation
Dr. Neus Ferrer-Miralles
Website
Guest Editor
Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Spain. Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain; Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain; Plataforma de Producción de Proteínas, CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) and Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain
Interests: recombinant protein; protein engineering; nanobiotechnology; microbiology; protein nanoparticles; protein aggregation; functional amyloids; cell-targeted delivery

Special Issue Information

Dear Colleagues,

Many proteins of interest are produced in recombinant prokaryotic or eukaryotic expression systems. Among the prokaryotic expression systems, bacterial hosts are widely used for the production of recombinant proteins. Under overexpression conditions, the overproduced heterologous protein in recombinant bacteria can partition into two separate fractions: soluble and insoluble (also known as inclusion bodies). Often, the proteins of interest are difficult to express and, as a consequence, the final yields are unacceptable. In other cases, the proteins are prone to aggregation, making it challenging or impossible to obtain protein from the soluble fraction. In light of these issues, much of the research effort during the last few decades has gone towards the development of strategies to increase the efficiency of the production process for those difficult-to-obtain proteins. Thus, this Special Issue of IJMS will cover recent research activity towards the development of novel strategies used to obtain optimal yields of difficult-to-produce heterologous proteins which use bacterial expression systems as cell factories.

Dr. Elena Garcia-Fruitos
Dr. Neus Ferrer-Miralles
Guest Editors

Manuscript Submission Information

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Keywords

  • recombinant proteins
  • heterologous proteins
  • difficult-to-produce proteins
  • bacterial expression systems
  • strategies for protein production
  • strategies for protein purification

Published Papers (6 papers)

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Research

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Open AccessArticle
Production of Extracellular Matrix Proteins in the Cytoplasm of E. coli: Making Giants in Tiny Factories
Int. J. Mol. Sci. 2020, 21(3), 688; https://doi.org/10.3390/ijms21030688 - 21 Jan 2020
Abstract
Escherichia coli is the most widely used protein production host in academia and a major host for industrial protein production. However, recombinant production of eukaryotic proteins in prokaryotes has challenges. One of these is post-translational modifications, including native disulfide bond formation. Proteins containing [...] Read more.
Escherichia coli is the most widely used protein production host in academia and a major host for industrial protein production. However, recombinant production of eukaryotic proteins in prokaryotes has challenges. One of these is post-translational modifications, including native disulfide bond formation. Proteins containing disulfide bonds have traditionally been made by targeting to the periplasm or by in vitro refolding of proteins made as inclusion bodies. More recently, systems for the production of disulfide-containing proteins in the cytoplasm have been introduced. However, it is unclear if these systems have the capacity for the production of disulfide-rich eukaryotic proteins. To address this question, we tested the capacity of one such system to produce domain constructs, containing up to 44 disulfide bonds, of the mammalian extracellular matrix proteins mucin 2, alpha tectorin, and perlecan. All were successfully produced with purified yields up to 6.5 mg/L. The proteins were further analyzed using a variety of biophysical techniques including circular dichroism spectrometry, thermal stability assay, and mass spectrometry. These analyses indicated that the purified proteins are most likely correctly folded to their native state. This greatly extends the use of E. coli for the production of eukaryotic proteins for structural and functional studies. Full article
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Open AccessArticle
Expression, Purification, and Characterization of Anti-Zika virus Envelope Protein: Polyclonal and Chicken-Derived Single Chain Variable Fragment Antibodies
Int. J. Mol. Sci. 2020, 21(2), 492; https://doi.org/10.3390/ijms21020492 - 13 Jan 2020
Abstract
Zika virus (ZIKV) is a new and emerging virus that has caused outbreaks worldwide. The virus has been linked to congenital neurological malformations in neonates and Guillain–Barré syndrome in adults. Currently there are no effective vaccines available. As a result, there is a [...] Read more.
Zika virus (ZIKV) is a new and emerging virus that has caused outbreaks worldwide. The virus has been linked to congenital neurological malformations in neonates and Guillain–Barré syndrome in adults. Currently there are no effective vaccines available. As a result, there is a great need for ZIKV treatment. In this study, we developed single chain variable fragment (scFv) antibodies that target the ZIKV envelope protein using phage display technology. We first induced an immune response in white leghorn laying hens against the ZIKV envelope (E) protein. Chickens were immunized and polyclonal immunoglobulin yolk (IgY) antibodies were extracted from egg yolks. A high-level titer of anti-ZIKV_E IgY antibodies was detected using enzyme-linked immunosorbent assay (ELISA) after the third immunization. The titer persisted for at least 9 weeks. We constructed two antibody libraries that contained 5.3 × 106 and 4.5 × 106 transformants. After biopanning, an ELISA phage assay confirmed the enrichment of specific clones. We randomly selected 26 clones that expressed ZIKV scFv antibodies and classified them into two groups, short-linker and long-linker. Of these, four showed specific binding activities toward ZIKV_E proteins. These data suggest that the polyclonal and monoclonal scFv antibodies have the diagnostic or therapeutic potential for ZIKV. Full article
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Review

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Open AccessReview
Engineering Biology to Construct Microbial Chassis for the Production of Difficult-to-Express Proteins
Int. J. Mol. Sci. 2020, 21(3), 990; https://doi.org/10.3390/ijms21030990 - 02 Feb 2020
Abstract
A large proportion of the recombinant proteins manufactured today rely on microbe-based expression systems owing to their relatively simple and cost-effective production schemes. However, several issues in microbial protein expression, including formation of insoluble aggregates, low protein yield, and cell death are still [...] Read more.
A large proportion of the recombinant proteins manufactured today rely on microbe-based expression systems owing to their relatively simple and cost-effective production schemes. However, several issues in microbial protein expression, including formation of insoluble aggregates, low protein yield, and cell death are still highly recursive and tricky to optimize. These obstacles are usually rooted in the metabolic capacity of the expression host, limitation of cellular translational machineries, or genetic instability. To this end, several microbial strains having precisely designed genomes have been suggested as a way around the recurrent problems in recombinant protein expression. Already, a growing number of prokaryotic chassis strains have been genome-streamlined to attain superior cellular fitness, recombinant protein yield, and stability of the exogenous expression pathways. In this review, we outline challenges associated with heterologous protein expression, some examples of microbial chassis engineered for the production of recombinant proteins, and emerging tools to optimize the expression of heterologous proteins. In particular, we discuss the synthetic biology approaches to design and build and test genome-reduced microbial chassis that carry desirable characteristics for heterologous protein expression. Full article
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Open AccessReview
Escherichia coli Extract-Based Cell-Free Expression System as an Alternative for Difficult-to-Obtain Protein Biosynthesis
Int. J. Mol. Sci. 2020, 21(3), 928; https://doi.org/10.3390/ijms21030928 - 31 Jan 2020
Abstract
Before utilization in biomedical diagnosis, therapeutic treatment, and biotechnology, the diverse variety of peptides and proteins must be preliminarily purified and thoroughly characterized. The recombinant DNA technology and heterologous protein expression have helped simplify the isolation of targeted polypeptides at high purity and [...] Read more.
Before utilization in biomedical diagnosis, therapeutic treatment, and biotechnology, the diverse variety of peptides and proteins must be preliminarily purified and thoroughly characterized. The recombinant DNA technology and heterologous protein expression have helped simplify the isolation of targeted polypeptides at high purity and their structure-function examinations. Recombinant protein expression in Escherichia coli, the most-established heterologous host organism, has been widely used to produce proteins of commercial and fundamental research interests. Nonetheless, many peptides/proteins are still difficult to express due to their ability to slow down cell growth or disrupt cellular metabolism. Besides, special modifications are often required for proper folding and activity of targeted proteins. The cell-free (CF) or in vitro recombinant protein synthesis system enables the production of such difficult-to-obtain molecules since it is possible to adjust reaction medium and there is no need to support cellular metabolism and viability. Here, we describe E. coli-based CF systems, the optimization steps done toward the development of highly productive and cost-effective CF methodology, and the modification of an in vitro approach required for difficult-to-obtain protein production. Full article
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Open AccessReview
Extremely Low Leakage Expression Systems Using Dual Transcriptional-Translational Control for Toxic Protein Production
Int. J. Mol. Sci. 2020, 21(3), 705; https://doi.org/10.3390/ijms21030705 - 21 Jan 2020
Abstract
Expression systems for highly toxic protein genes must be conditional and suppress leakage expression to almost zero because even faint leakage expression may kill host cells, inhibit host growth, and cause loss of plasmids containing the toxic protein genes. The most widely used [...] Read more.
Expression systems for highly toxic protein genes must be conditional and suppress leakage expression to almost zero because even faint leakage expression may kill host cells, inhibit host growth, and cause loss of plasmids containing the toxic protein genes. The most widely used conditional expression systems are controlled only at the transcriptional level, and complete suppression of leakage expression is challenging. Recent progress on translational control has enabled construction of dual transcriptional-translational control systems in which leakage expression is strongly suppressed. This review summarizes the principles, features, and practical examples of dual transcriptional-translational control systems in bacteria, and provides future perspectives on these systems. Full article
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Open AccessReview
Heterologous and Homologous Expression of Proteins from Haloarchaea: Denitrification as Case of Study
Int. J. Mol. Sci. 2020, 21(1), 82; https://doi.org/10.3390/ijms21010082 - 20 Dec 2019
Abstract
Haloarchaea (halophilic microbes belonging to the Archaea domain) are microorganisms requiring mid or even high salt concentrations to be alive. The molecular machinery of these organisms is adapted to such conditions, which are stressful for most life forms. Among their molecular adaptations, halophilic [...] Read more.
Haloarchaea (halophilic microbes belonging to the Archaea domain) are microorganisms requiring mid or even high salt concentrations to be alive. The molecular machinery of these organisms is adapted to such conditions, which are stressful for most life forms. Among their molecular adaptations, halophilic proteins are characterized by their high content of acidic amino acids (Aspartate (Asp) and glumate (Glu)), being only stable in solutions containing high salt concentration (between 1 and 4 M total salt concentration). Recent knowledge about haloarchaeal peptides, proteins, and enzymes have revealed that many haloarchaeal species produce proteins of interest due to their potential applications in biotechnology-based industries. Although proteins of interest are usually overproduced in recombinant prokaryotic or eukaryotic expression systems, these procedures do not accurately work for halophilic proteins, mainly if such proteins contain metallocofactors in their structures. This work summarizes the main challenges of heterologous and homologous expression of enzymes from haloarchaea, paying special attention to the metalloenzymes involved in the pathway of denitrification (anaerobic reduction of nitrate to dinitrogen), a pathway with significant implications in wastewater treatment, climate change, and biosensor design. Full article
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