Cargando…
Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection
Cloning and expression plasmids are the workhorses of modern molecular biology. Despite the pathway paved by synthetic biology, laboratories around the globe still relay on standard cloning techniques using plasmids with reporter proteins for positive clone selection, such as β-galactosidase alpha p...
Autores principales: | , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6099721/ https://www.ncbi.nlm.nih.gov/pubmed/29857551 http://dx.doi.org/10.3390/molecules23061328 |
_version_ | 1783348731600437248 |
---|---|
author | Tafoya-Ramírez, Margarita Daniela Padilla-Vaca, Felipe Ramírez-Saldaña, Ana Patricia Mora-Garduño, Josué Daniel Rangel-Serrano, Ángeles Vargas-Maya, Naurú Idalia Herrera-Gutiérrez, Luz Janeth Franco, Bernardo |
author_facet | Tafoya-Ramírez, Margarita Daniela Padilla-Vaca, Felipe Ramírez-Saldaña, Ana Patricia Mora-Garduño, Josué Daniel Rangel-Serrano, Ángeles Vargas-Maya, Naurú Idalia Herrera-Gutiérrez, Luz Janeth Franco, Bernardo |
author_sort | Tafoya-Ramírez, Margarita Daniela |
collection | PubMed |
description | Cloning and expression plasmids are the workhorses of modern molecular biology. Despite the pathway paved by synthetic biology, laboratories around the globe still relay on standard cloning techniques using plasmids with reporter proteins for positive clone selection, such as β-galactosidase alpha peptide complementation for blue/white screening or ccdB, which encodes for a toxic DNA gyrase. These reporters, when interrupted, serve as a positive clone detection system. In the present report, we show that molecular cloning plasmids bearing the coding sequence for a 25.4 kDa protein, AmilCP, encoded by a 685 bp gene, that is well expressed in Escherichia coli, render blue-purple colonies. Using this reporter protein, we developed and tested a cloning system based on the constitutive expression of the non-toxic AmilCP protein, that once interrupted, the loss of purple color serves to facilitate positive clone selection. The main advantage of this system is that is less expensive than other systems since media do not contain chromogenic markers such as X-gal, which is both expensive and cumbersome to prepare and use, or inductors such as IPTG. We also designed an inducible expression plasmid suitable for recombinant protein expression that also contains AmilCP cloning selection marker, a feature not commonly found in protein expression plasmids. The use of chromogenic reporters opens an important avenue for its application in other organisms besides E. coli for clone selection or even for mutant selection. |
format | Online Article Text |
id | pubmed-6099721 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-60997212018-11-13 Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection Tafoya-Ramírez, Margarita Daniela Padilla-Vaca, Felipe Ramírez-Saldaña, Ana Patricia Mora-Garduño, Josué Daniel Rangel-Serrano, Ángeles Vargas-Maya, Naurú Idalia Herrera-Gutiérrez, Luz Janeth Franco, Bernardo Molecules Article Cloning and expression plasmids are the workhorses of modern molecular biology. Despite the pathway paved by synthetic biology, laboratories around the globe still relay on standard cloning techniques using plasmids with reporter proteins for positive clone selection, such as β-galactosidase alpha peptide complementation for blue/white screening or ccdB, which encodes for a toxic DNA gyrase. These reporters, when interrupted, serve as a positive clone detection system. In the present report, we show that molecular cloning plasmids bearing the coding sequence for a 25.4 kDa protein, AmilCP, encoded by a 685 bp gene, that is well expressed in Escherichia coli, render blue-purple colonies. Using this reporter protein, we developed and tested a cloning system based on the constitutive expression of the non-toxic AmilCP protein, that once interrupted, the loss of purple color serves to facilitate positive clone selection. The main advantage of this system is that is less expensive than other systems since media do not contain chromogenic markers such as X-gal, which is both expensive and cumbersome to prepare and use, or inductors such as IPTG. We also designed an inducible expression plasmid suitable for recombinant protein expression that also contains AmilCP cloning selection marker, a feature not commonly found in protein expression plasmids. The use of chromogenic reporters opens an important avenue for its application in other organisms besides E. coli for clone selection or even for mutant selection. MDPI 2018-05-31 /pmc/articles/PMC6099721/ /pubmed/29857551 http://dx.doi.org/10.3390/molecules23061328 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Tafoya-Ramírez, Margarita Daniela Padilla-Vaca, Felipe Ramírez-Saldaña, Ana Patricia Mora-Garduño, Josué Daniel Rangel-Serrano, Ángeles Vargas-Maya, Naurú Idalia Herrera-Gutiérrez, Luz Janeth Franco, Bernardo Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection |
title | Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection |
title_full | Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection |
title_fullStr | Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection |
title_full_unstemmed | Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection |
title_short | Replacing Standard Reporters from Molecular Cloning Plasmids with Chromoproteins for Positive Clone Selection |
title_sort | replacing standard reporters from molecular cloning plasmids with chromoproteins for positive clone selection |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6099721/ https://www.ncbi.nlm.nih.gov/pubmed/29857551 http://dx.doi.org/10.3390/molecules23061328 |
work_keys_str_mv | AT tafoyaramirezmargaritadaniela replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT padillavacafelipe replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT ramirezsaldanaanapatricia replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT moragardunojosuedaniel replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT rangelserranoangeles replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT vargasmayanauruidalia replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT herreragutierrezluzjaneth replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection AT francobernardo replacingstandardreportersfrommolecularcloningplasmidswithchromoproteinsforpositivecloneselection |