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Housmans JAJ, Wu G, Schymkowitz J, Rousseau F. A guide to studying protein aggregation. FEBS J 2023; 290:554-583. [PMID: 34862849 DOI: 10.1111/febs.16312] [Citation(s) in RCA: 56] [Impact Index Per Article: 56.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/18/2021] [Accepted: 12/03/2021] [Indexed: 02/04/2023]
Abstract
Disrupted protein folding or decreased protein stability can lead to the accumulation of (partially) un- or misfolded proteins, which ultimately cause the formation of protein aggregates. Much of the interest in protein aggregation is associated with its involvement in a wide range of human diseases and the challenges it poses for large-scale biopharmaceutical manufacturing and formulation of therapeutic proteins and peptides. On the other hand, protein aggregates can also be functional, as observed in nature, which triggered its use in the development of biomaterials or therapeutics as well as for the improvement of food characteristics. Thus, unmasking the various steps involved in protein aggregation is critical to obtain a better understanding of the underlying mechanism of amyloid formation. This knowledge will allow a more tailored development of diagnostic methods and treatments for amyloid-associated diseases, as well as applications in the fields of new (bio)materials, food technology and therapeutics. However, the complex and dynamic nature of the aggregation process makes the study of protein aggregation challenging. To provide guidance on how to analyse protein aggregation, in this review we summarize the most commonly investigated aspects of protein aggregation with some popular corresponding methods.
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Affiliation(s)
- Joëlle A J Housmans
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Guiqin Wu
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Joost Schymkowitz
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Frederic Rousseau
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
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2
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Hao S, Liu Y, Qin Y, Zhao L, Zhang J, Wu T, Sun B, Wang C. Expression of a highly active β-glucosidase from Aspergillus niger AS3.4523 in Escherichia coli and its application in gardenia blue preparation. ANN MICROBIOL 2020. [DOI: 10.1186/s13213-020-01576-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Purpose
Gardenia blue is one of the natural food additives used in East Asia for many years. Its biosynthesis relies on a key rate-limiting cellulase: β-glucosidase (BGL), which mainly exists in Aspergillus niger (A. niger) cells. The purpose of this study was to obtain active β-glucosidase by cell engineering method and applied to gardenia blue synthesis, which would help to promote the application and reduce the cost of β-glucosidase and gardenia blue.
Methods
A. niger was identified based on 18S rRNA gene sequencing. β-Glucosidase gene was cloned and expressed based on PCR and prokaryotic expression. The enzyme activity of β-glucosidase was measured based on p-nitrophenyl-β-D-glucopyranoside method.
Results
An A. niger isolate (AS3.4523) was identified from soil. The β-glucosidase gene of AS3.4523 was cloned and sequenced, which encoded a new type of β-glucosidase mutant containing two specific amino acid substitutions (Asp154Gly and Ser163Pro). Prokaryotic expression of wild-type β-glucosidase in Escherichia coli BL21 showed low cellulase activity (0.29 ± 0.13 U/mL). However, after removing its signal peptide, the β-glucosidase of A. niger AS3.4523 exhibited extremely higher activity (25.88 ± 0.45 U/mL) compared with wild type β-glucosidase (12.59 ± 1.07 U/mL) or other A. niger strains M85 (3.61 ± 0.24 U/mL) and CICC2041 (4.36 ± 0.76 U/mL). Furthermore, recombinant β-glucosidase was applied to geniposide hydrolysis, and gardenia blue pigment was successfully synthesized with the reaction of genipin and Lys.
Conclusions
This work has discovered a new type of highly active β-glucosidase and provided a theoretical basis for large-scale producing β-glucosidase, which lays a brand-new foundation for gardenia blue preparation with high efficiency and low cost.
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3
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Engineering and functionalization of large circular tandem repeat protein nanoparticles. Nat Struct Mol Biol 2020; 27:342-350. [PMID: 32203491 DOI: 10.1038/s41594-020-0397-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 02/13/2020] [Indexed: 11/09/2022]
Abstract
Protein engineering has enabled the design of molecular scaffolds that display a wide variety of sizes, shapes, symmetries and subunit compositions. Symmetric protein-based nanoparticles that display multiple protein domains can exhibit enhanced functional properties due to increased avidity and improved solution behavior and stability. Here we describe the creation and characterization of a computationally designed circular tandem repeat protein (cTRP) composed of 24 identical repeated motifs, which can display a variety of functional protein domains (cargo) at defined positions around its periphery. We demonstrate that cTRP nanoparticles can self-assemble from smaller individual subunits, can be produced from prokaryotic and human expression platforms, can employ a variety of cargo attachment strategies and can be used for applications (such as T-cell culture and expansion) requiring high-avidity molecular interactions on the cell surface.
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Liu ZL, Li HN, Song HT, Xiao WJ, Xia WC, Liu XP, Jiang ZB. Construction of a trifunctional cellulase and expression in Saccharomyces cerevisiae using a fusion protein. BMC Biotechnol 2018; 18:43. [PMID: 30005661 PMCID: PMC6044064 DOI: 10.1186/s12896-018-0454-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 07/04/2018] [Indexed: 01/11/2023] Open
Abstract
Background Cellulose is the most important component of lignocellulose, and its degradation requires three different types of enzymes to act synergistically. There have been reports of single gene duality, but no gene has been described to have more than two functions. Cloning and expression of fusion cellulases containing more than two kinds of catalytic domains has not been reported thus far. Results We synthesized three different cellulase genes and linked the three catalytic domains with a (G4S)3 flexible linker. The trifunctional cellulase gene (BCE) containing three types of cellulase functions was constructed and expressed in S. cerevisiae successfully. The β-glucosidase, the exoglucanase and the endoglucanase activity of the trifunctional cellulase BCE reached 16.80 IU/mg, 2.26 IU/mg and 20.67 IU/mg, which was 46.27, 6.73 and 46.20% higher than the activities of the β-glucosidase BG, the endoglucanase CBH and the endoglucanase EG. The filter paper enzyme activity of BCE was higher than those of BG, CBH and EG, reached 2.04 IU/mg. Conclusions The trifunctional cellulase BCE was designed based on β-glucosidase BG, endoglucanase EG and exoglucanase CBH, and it possessed β-glucosidase activity, endoglucanase activity and exoglucanase activity simultaneously. The BCE has better filter paper activity, it means the potential practical application. Electronic supplementary material The online version of this article (10.1186/s12896-018-0454-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zi-Lu Liu
- Hubei Key Laboratory of Industrial Biotechnology College of Life Science, Hubei University, Wuhan, 430062, People's Republic of China.,Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, 430062, People's Republic of China
| | - Hua-Nan Li
- Hubei Key Laboratory of Industrial Biotechnology College of Life Science, Hubei University, Wuhan, 430062, People's Republic of China
| | - Hui-Ting Song
- Hubei Key Laboratory of Industrial Biotechnology College of Life Science, Hubei University, Wuhan, 430062, People's Republic of China.,College of Resources and Environmental Science, Hubei University, Wuhan, 430062, People's Republic of China
| | - Wen-Jing Xiao
- Hubei Key Laboratory of Industrial Biotechnology College of Life Science, Hubei University, Wuhan, 430062, People's Republic of China
| | - Wu-Cheng Xia
- Hubei Key Laboratory of Industrial Biotechnology College of Life Science, Hubei University, Wuhan, 430062, People's Republic of China
| | - Xiao-Peng Liu
- Department of Biological Science and Technology, Hubei University for Nationalities, Ensi, 445000, People's Republic of China
| | - Zheng-Bing Jiang
- Hubei Key Laboratory of Industrial Biotechnology College of Life Science, Hubei University, Wuhan, 430062, People's Republic of China. .,Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, 430062, People's Republic of China.
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Kang DH, You SK, Joo YC, Shin SK, Hyeon JE, Han SO. Synergistic effect of the enzyme complexes comprising agarase, carrageenase and neoagarobiose hydrolase on degradation of the red algae. BIORESOURCE TECHNOLOGY 2018; 250:666-672. [PMID: 29220811 DOI: 10.1016/j.biortech.2017.11.098] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 11/28/2017] [Accepted: 11/29/2017] [Indexed: 06/07/2023]
Abstract
In the practice of converting red algae biomass into biofuel or valuable biomaterials, the critical step is the decomposition process of the agarose to give fermentable monomeric sugars. In this study, we selected three enzymes such as agarase, carrageenase and neoagarobiose hydrolase to inducible the simultaneous hydrolysis of the major substrates such as agar and carrageenan constituting the pretreated red algae, and expressed the chimeric enzymes and formed a complexes through optimization of addition ratio. As a result, hydrolysis by enzyme complexes showed a maximum sugar release of 679 mg L-1 with 67.9% saccharification yield from G. verrucosa natural substrate. The difference in the reducing sugar by the enzyme complexes was 3.6-fold higher than that of the monomer enzyme (cAgaB yield 188.6 mg L-1). The synergistic effect of producing sugars from red algae biomass through these enzyme complexes can be a very important biological tools aimed at bioenergy production.
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Affiliation(s)
- Dae Hee Kang
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea; Institute of Life Science and Natural Resources, Korea University, Seoul 02841, Republic of Korea
| | - Seung Kyou You
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Young-Chul Joo
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Sang Kyu Shin
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jeong Eun Hyeon
- Institute of Life Science and Natural Resources, Korea University, Seoul 02841, Republic of Korea
| | - Sung Ok Han
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea.
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Shah V, Pierre B, Kirtadze T, Shin S, Kim JR. Stabilization of Bacillus circulans xylanase by combinatorial insertional fusion to a thermophilic host protein. Protein Eng Des Sel 2017; 30:281-290. [PMID: 28100651 DOI: 10.1093/protein/gzw081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Accepted: 12/21/2016] [Indexed: 11/15/2022] Open
Abstract
High thermostability of an enzyme is critical for its industrial application. While many engineering approaches such as mutagenesis have enhanced enzyme thermostability, they often suffer from reduced enzymatic activity. A thermally stabilized enzyme with unchanged amino acids is preferable for subsequent functional evolution necessary to address other important industrial needs. In the research presented here, we applied insertional fusion to a thermophilic maltodextrin-binding protein from Pyrococcus furiosus (PfMBP) in order to improve the thermal stability of Bacillus circulans xylanase (BCX). Specifically, we used an engineered transposon to construct a combinatorial library of randomly inserted BCX into PfMBP. The library was then subjected to functional screening to identify successful PfMBP-BCX insertion complexes, PfMBP-BCX161 and PfMBP-BCX165, displaying substantially improved kinetic stability at elevated temperatures compared to unfused BCX and other controls. Results from subsequent characterizations were consistent with the view that lowered aggregation of BCX and reduced conformational flexibility at the termini was responsible for increased thermal stability. Our stabilizing approach neither sacrificed xylanase activity nor required changes in the BCX amino acid sequence. Overall, the current study demonstrated the benefit of combinatorial insertional fusion to PfMBP as a systematic tool for the creation of enzymatically active and thermostable BCX variants.
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Affiliation(s)
- Vandan Shah
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, USA
| | - Brennal Pierre
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, USA
| | - Tamari Kirtadze
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, USA
| | - Seung Shin
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, USA
| | - Jin Ryoun Kim
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, USA
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Gunnoo M, Cazade PA, Galera-Prat A, Nash MA, Czjzek M, Cieplak M, Alvarez B, Aguilar M, Karpol A, Gaub H, Carrión-Vázquez M, Bayer EA, Thompson D. Nanoscale Engineering of Designer Cellulosomes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:5619-47. [PMID: 26748482 DOI: 10.1002/adma.201503948] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/01/2015] [Indexed: 05/27/2023]
Abstract
Biocatalysts showcase the upper limit obtainable for high-speed molecular processing and transformation. Efforts to engineer functionality in synthetic nanostructured materials are guided by the increasing knowledge of evolving architectures, which enable controlled molecular motion and precise molecular recognition. The cellulosome is a biological nanomachine, which, as a fundamental component of the plant-digestion machinery from bacterial cells, has a key potential role in the successful development of environmentally-friendly processes to produce biofuels and fine chemicals from the breakdown of biomass waste. Here, the progress toward so-called "designer cellulosomes", which provide an elegant alternative to enzyme cocktails for lignocellulose breakdown, is reviewed. Particular attention is paid to rational design via computational modeling coupled with nanoscale characterization and engineering tools. Remaining challenges and potential routes to industrial application are put forward.
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Affiliation(s)
- Melissabye Gunnoo
- Materials and Surface Science Institute and Department of Physics and Energy, University of Limerick, Limerick, Ireland
| | - Pierre-André Cazade
- Materials and Surface Science Institute and Department of Physics and Energy, University of Limerick, Limerick, Ireland
| | - Albert Galera-Prat
- Instituto Cajal, Consejo Superior de Investigaciones Cientificas (CSIC), IMDEA Nanociencias and CIBERNED, Madrid, Spain
| | - Michael A Nash
- Lehrstuhl für Angewandte Physik and Center for Nanoscience, Ludwig-Maximilians-University, 80799, Munich, Germany
| | - Mirjam Czjzek
- Sorbonne Universités, UPMC, Université Paris 06, and Centre National de la Recherche Scientifique, UMR 8227, Integrative Biology of Marine Models, Station Biologique, de Roscoff, CS 90074, F-29688, Roscoff cedex, Bretagne, France
| | - Marek Cieplak
- Laboratory of Biological Physics, Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
| | - Beatriz Alvarez
- Biopolis S.L., Parc Científic de la Universitat de Valencia, Edificio 2, C/Catedrático Agustín Escardino 9, 46980, Paterna (Valencia), Spain
| | - Marina Aguilar
- Abengoa, S.A., Palmas Altas, Calle Energía Solar nº 1, 41014, Seville, Spain
| | - Alon Karpol
- Designer Energy Ltd., 2 Bergman St., Tamar Science Park, Rehovot, 7670504, Israel
| | - Hermann Gaub
- Lehrstuhl für Angewandte Physik and Center for Nanoscience, Ludwig-Maximilians-University, 80799, Munich, Germany
| | - Mariano Carrión-Vázquez
- Instituto Cajal, Consejo Superior de Investigaciones Cientificas (CSIC), IMDEA Nanociencias and CIBERNED, Madrid, Spain
| | - Edward A Bayer
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Damien Thompson
- Materials and Surface Science Institute and Department of Physics and Energy, University of Limerick, Limerick, Ireland
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Cunha ES, Hatem CL, Barrick D. Synergistic enhancement of cellulase pairs linked by consensus ankyrin repeats: Determination of the roles of spacing, orientation, and enzyme identity. Proteins 2016; 84:1043-54. [PMID: 27071357 DOI: 10.1002/prot.25047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 03/09/2016] [Accepted: 03/25/2016] [Indexed: 12/22/2022]
Abstract
Biomass deconstruction to small simple sugars is a potential approach to biofuels production; however, the highly recalcitrant nature of biomass limits the economic viability of this approach. Thus, research on efficient biomass degradation is necessary to achieve large-scale production of biofuels. Enhancement of cellulolytic activity by increasing synergism between cellulase enzymes holds promise in achieving high-yield biofuels production. Here we have inserted cellulase pairs from extremophiles into hyperstable α-helical consensus ankyrin repeat domain scaffolds. Such chimeric constructs allowed us to optimize arrays of enzyme pairs against a variety of cellulolytic substrates. We found that endocellulolytic domains CelA (CA) and Cel12A (C12A) act synergistically in the context of ankyrin repeats, with both three and four repeat spacing. The extent of synergy differs for different substrates. Also, having C12A N-terminal to CA provides greater synergy than the reverse construct, especially against filter paper. In contrast, we do not see synergy for these enzymes in tandem with CelK (CK) catalytic domain, a larger exocellulase, demonstrating the importance of enzyme identity in synergistic enhancement. Furthermore, we found endocellulases CelD and CA with three repeat spacing to act synergistically against filter paper. Importantly, connecting CA and C12A with a disordered linker of similar contour length shows no synergistic enhancement, indicating that synergism results from connecting these domains with folded ankyrin repeats. These results show that ankyrin arrays can be used to vary spacing and orientation between enzymes, helping to design and optimize artificial cellulosomes, providing a novel architecture for synergistic enhancement of enzymatic cellulose degradation. Proteins 2016; 84:1043-1054. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Eva S Cunha
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, 3400 N. Charles St, Baltimore, Maryland, 21218.,Department of Structural Biology, Max Plank Institute of Biophysics, Max-von-Laue-Str. 3, Frankfurt am Main, D-60438, Germany
| | - Christine L Hatem
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, 3400 N. Charles St, Baltimore, Maryland, 21218
| | - Doug Barrick
- T.C. Jenkins Department of Biophysics, Johns Hopkins University, 3400 N. Charles St, Baltimore, Maryland, 21218
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9
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Pierre B, Labonte JW, Xiong T, Aoraha E, Williams A, Shah V, Chau E, Helal KY, Gray JJ, Kim JR. Molecular Determinants for Protein Stabilization by Insertional Fusion to a Thermophilic Host Protein. Chembiochem 2015; 16:2392-402. [DOI: 10.1002/cbic.201500310] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Indexed: 12/26/2022]
Affiliation(s)
- Brennal Pierre
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
| | - Jason W. Labonte
- Department of Chemical and Biomolecular Engineering; Johns Hopkins University; 3400 North Charles Street Baltimore MD 21218 USA
| | - Tina Xiong
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
- Department of Chemical and Biomolecular Engineering; Johns Hopkins University; 3400 North Charles Street Baltimore MD 21218 USA
| | - Edwin Aoraha
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
| | - Asher Williams
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
| | - Vandan Shah
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
| | - Edward Chau
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
| | - Kazi Yasin Helal
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
| | - Jeffrey J. Gray
- Department of Chemical and Biomolecular Engineering; Johns Hopkins University; 3400 North Charles Street Baltimore MD 21218 USA
| | - Jin Ryoun Kim
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering; New York University; 6 MetroTech Center Brooklyn NY 11201 USA
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10
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Gonçalves GAL, Mori Y, Kamiya N. Biomolecular assembly strategies to develop potential artificial cellulosomes. ACTA ACUST UNITED AC 2014. [DOI: 10.1186/s40508-014-0019-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Abstract
Cellulosic biomass is a sustainable source for fuels and value-added chemicals, and is available in large quantities. One of the key challenges in biomass processing is associated with the establishment of an efficient enzymatic degradation of plant cell wall. A multi-enzymatic complex, cellulosome, was identified as a highly efficient biocatalyst for the hydrolysis of cellulosic biomass in nature. Significant progress has been achieved on cellulosome production and application since its discovery, but there is still a gap for industrial use. Artificial systems are being developed by employing various pairs of proteins and scaffolds with the objective of reconstructing this natural multi-enzymatic complex for sustainable biotechnology application.
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11
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Signal peptide of cellulase. Appl Microbiol Biotechnol 2014; 98:5329-62. [DOI: 10.1007/s00253-014-5742-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Revised: 03/28/2014] [Accepted: 03/30/2014] [Indexed: 12/24/2022]
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