One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase
Enzymes active at low temperature are of great interest for industrial bioprocesses due to their high efficiency at a low energy cost. One of the particularities of naturally evolved cold-active enzymes is their increased enzymatic activity at low temperature, however the low thermostability present...
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ftpubman:oai:pure.mpg.de:item_2451513 2023-08-20T04:02:26+02:00 One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase Acevedo, J. Reetz, M. Asenjo, J. Parra, L. 2017-05-01 http://hdl.handle.net/11858/00-001M-0000-002D-6F2E-B eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.enzmictec.2017.02.005 http://hdl.handle.net/11858/00-001M-0000-002D-6F2E-B Enzyme and Microbial Technology info:eu-repo/semantics/article 2017 ftpubman https://doi.org/10.1016/j.enzmictec.2017.02.005 2023-08-01T22:30:20Z Enzymes active at low temperature are of great interest for industrial bioprocesses due to their high efficiency at a low energy cost. One of the particularities of naturally evolved cold-active enzymes is their increased enzymatic activity at low temperature, however the low thermostability presented in this type of enzymes is still a major drawback for their application in biocatalysis. Directed evolution of cold-adapted enzymes to a more thermostable version, appears as an attractive strategy to fulfill the stability and activity requirements for the industry. This paper describes the recombinant expression and characterization of a new and highly active cold-adapted xylanase from the GH-family 10 (Xyl-L), and the use of a novel one step combined directed evolution technique that comprises saturation mutagenesis and focused epPCR as a feasible semi-rational strategy to improve the thermostability. The Xyl-L enzyme was cloned from a marine-Antarctic bacterium, Psychrobacter sp. strain 2–17, recombinantly expressed in E. coli strain BL21(DE3) and characterized enzymatically. Molecular dynamic simulations using a homology model of the catalytic domain of Xyl-L were performed to detect flexible regions and residues, which are considered to be the possible structural elements that define the thermolability of this enzyme. Mutagenic libraries were designed in order to stabilize the protein introducing mutations in some of the flexible regions and residues identified. Twelve positive mutant clones were found to improve the T 50 15 value of the enzyme, in some cases without affecting the activity at 25◦C. The best mutant showed a 4.3◦C increase in its T 50 15 . The efficiency of the directed evolution approach can also be expected to work in the protein engineering of stereoselectivity. Article in Journal/Newspaper Antarc* Antarctic Max Planck Society: MPG.PuRe Antarctic Enzyme and Microbial Technology 100 60 70 |
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Max Planck Society: MPG.PuRe |
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English |
description |
Enzymes active at low temperature are of great interest for industrial bioprocesses due to their high efficiency at a low energy cost. One of the particularities of naturally evolved cold-active enzymes is their increased enzymatic activity at low temperature, however the low thermostability presented in this type of enzymes is still a major drawback for their application in biocatalysis. Directed evolution of cold-adapted enzymes to a more thermostable version, appears as an attractive strategy to fulfill the stability and activity requirements for the industry. This paper describes the recombinant expression and characterization of a new and highly active cold-adapted xylanase from the GH-family 10 (Xyl-L), and the use of a novel one step combined directed evolution technique that comprises saturation mutagenesis and focused epPCR as a feasible semi-rational strategy to improve the thermostability. The Xyl-L enzyme was cloned from a marine-Antarctic bacterium, Psychrobacter sp. strain 2–17, recombinantly expressed in E. coli strain BL21(DE3) and characterized enzymatically. Molecular dynamic simulations using a homology model of the catalytic domain of Xyl-L were performed to detect flexible regions and residues, which are considered to be the possible structural elements that define the thermolability of this enzyme. Mutagenic libraries were designed in order to stabilize the protein introducing mutations in some of the flexible regions and residues identified. Twelve positive mutant clones were found to improve the T 50 15 value of the enzyme, in some cases without affecting the activity at 25◦C. The best mutant showed a 4.3◦C increase in its T 50 15 . The efficiency of the directed evolution approach can also be expected to work in the protein engineering of stereoselectivity. |
format |
Article in Journal/Newspaper |
author |
Acevedo, J. Reetz, M. Asenjo, J. Parra, L. |
spellingShingle |
Acevedo, J. Reetz, M. Asenjo, J. Parra, L. One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase |
author_facet |
Acevedo, J. Reetz, M. Asenjo, J. Parra, L. |
author_sort |
Acevedo, J. |
title |
One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase |
title_short |
One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase |
title_full |
One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase |
title_fullStr |
One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase |
title_full_unstemmed |
One-Step Combined Focused epPCR and Saturation Mutagenesis for Thermostability Evolution of a New Cold-Active Xylanase |
title_sort |
one-step combined focused eppcr and saturation mutagenesis for thermostability evolution of a new cold-active xylanase |
publishDate |
2017 |
url |
http://hdl.handle.net/11858/00-001M-0000-002D-6F2E-B |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Enzyme and Microbial Technology |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.enzmictec.2017.02.005 http://hdl.handle.net/11858/00-001M-0000-002D-6F2E-B |
op_doi |
https://doi.org/10.1016/j.enzmictec.2017.02.005 |
container_title |
Enzyme and Microbial Technology |
container_volume |
100 |
container_start_page |
60 |
op_container_end_page |
70 |
_version_ |
1774712873178628096 |