1
|
Wang Y, Wang X, Yu L, Tian Y, Li S, Leng F, Ma J, Chen J. Effects of Sr 2 + on the preparation of Escherchia coli DH5α competent cells and plasmid transformation. PeerJ 2020. [DOI: 10.7717/peerj.9480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacterial gene transformation used with Escherichia coli as a desired microorganism is one of the important techniques in genetic engineering. In this study, the preparation of E. coli DH5α competent cells treated with SrCl2 and transformation by heat-shock with pUC19 plasmid was optimized by Response Surface Methodology (RSM). Other five E. coli strains including BL21 (DE3), HB-101, JM109, TOP10 and TG1, three different sizes plasmids (pUC19, pET32a, pPIC9k) were used to verify the protocol, respectively. The transformation mechanism was explored by scanning electron microscope combined with energy dispersive spectrometer (SEM-EDS), atomic absorption spectroscopy (AAS) and Fourier-transform infrared spectroscopy (FT-IR). An equation of regression model was obtained, and the ideal parameters were Sr2 + ions of 90 mM, heat-shock time of 90 s and 9 ng of plasmid. Under this conditions, the transformation efficiency could almost reach to 106 CFU/µg DNA. A small change of the cell surface structure has been observed between E. coli DH5α strain and competent cells by abovementioned spectrum technologies, which implied that a strict regulation mechanism involved in the formation of competent cells and transformation of plasmids. An equation of regression model for the competent cells preparation and plasmid transformation could be applied in gene cloning technology
Collapse
Affiliation(s)
- Yonggang Wang
- School of Energy and Power Engineering, Lanzhou University of Technology, Lan Zhou, Gansu, China
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
| | - Xinjian Wang
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
| | - Linmiao Yu
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
| | - Yuan Tian
- Lhasa National Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Shaowei Li
- Lhasa National Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Feifan Leng
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
| | - Jianzhong Ma
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
| | - Jixiang Chen
- School of Energy and Power Engineering, Lanzhou University of Technology, Lan Zhou, Gansu, China
- School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
| |
Collapse
|
2
|
Liu XY, Guo S, Ramoji A, Bocklitz T, Rösch P, Popp J, Yu HQ. Spatiotemporal Organization of Biofilm Matrix Revealed by Confocal Raman Mapping Integrated with Non-negative Matrix Factorization Analysis. Anal Chem 2019; 92:707-715. [DOI: 10.1021/acs.analchem.9b02593] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xiao-Yang Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
- InfectoGnostics Research Campus Jena, Philosophenweg 7, D-07743 Jena, Germany
| | - Shuxia Guo
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
- Leibniz Institute of Photonic Technology Jena - Member of the Research Alliance “Leibniz Health Technologies”, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
| | - Anuradha Ramoji
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
- Center for Sepsis Control and Care (CSCC), Jena University Hospital, Am Klinikum 1, D-07743 Jena, Germany
- Leibniz Institute of Photonic Technology Jena - Member of the Research Alliance “Leibniz Health Technologies”, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
| | - Thomas Bocklitz
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
- Leibniz Institute of Photonic Technology Jena - Member of the Research Alliance “Leibniz Health Technologies”, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
| | - Petra Rösch
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
- InfectoGnostics Research Campus Jena, Philosophenweg 7, D-07743 Jena, Germany
| | - Jürgen Popp
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, D-07743 Jena, Germany
- InfectoGnostics Research Campus Jena, Philosophenweg 7, D-07743 Jena, Germany
- Center for Sepsis Control and Care (CSCC), Jena University Hospital, Am Klinikum 1, D-07743 Jena, Germany
- Leibniz Institute of Photonic Technology Jena - Member of the Research Alliance “Leibniz Health Technologies”, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| |
Collapse
|
3
|
Why Johnny can't clone: Common pitfalls and not so common solutions. Biotechniques 2015; 59:IV-XIII. [PMID: 26345511 DOI: 10.2144/000114324] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 08/14/2015] [Indexed: 11/23/2022] Open
Abstract
The demand for cloned genes has increased incessantly over the past 32 years, but some who need recombinant plasmids struggle to produce them. While the pitfalls of traditional ligation-dependent cloning are non-trivial, most can be avoided with sufficient effort and attention to detail. Here, the chemical properties of enzymes and reagents used to clone genes into plasmids are reviewed to draw attention to the most pertinent details. In particular, the virtues of agarose gel electrophoresis monitoring, the nature of the interactions between DNA and silica, and challenges associated with thermostable DNA polymerases, restriction endonucleases, and T4 DNA ligase are explored. Common pitfalls associated with Escherichia coli transformation and DNA modifying enzymes are also described. A thorough understanding of established methods is essential for troubleshooting, implementing alternative approaches, and inventing new techniques in response to changes in technology and demand.
Collapse
|
4
|
Aich P, Patra M, Chatterjee AK, Roy SS, Basu T. Calcium chloride made E. coli competent for uptake of extraneous DNA through overproduction of OmpC protein. Protein J 2012; 31:366-73. [PMID: 22562126 DOI: 10.1007/s10930-012-9411-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In the standard method of transformation of Escherichia coli with extraneous DNA, cells are made competent for DNA uptake by incubating in ice-cold 100 mM CaCl(2). Analysis of the whole protein profile of CaCl(2)-treated E. coli cells by the techniques of one- and two-dimensional gel electrophoresis, MALDI-MS and immunoprecipitation revealed overproduction of outer membrane proteins OmpC, OmpA and heat-shock protein GroEL. In parity, transformation efficiency of E. coli ompC mutant by plasmid pUC19 DNA was found to be about 40 % lower than that of the wild type strain. Moreover, in E. coli cells containing groEL-bearing plasmid, induction of GroEL caused simultaneous overproduction of OmpC. On the other hand, less OmpC was synthesized in E. coli groEL mutant compared to its wild type counterpart, by CaCl(2)-shock. From these results it can be suggested that in the process of CaCl(2)-mediated generation of competence, the heat-shock chaperone GroEL has specific role in DNA entry into the cell, possibly through the overproduced OmpC and OmpA porins.
Collapse
Affiliation(s)
- Pulakesh Aich
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, 741 235, West Bengal, India
| | | | | | | | | |
Collapse
|
5
|
Pavlov E, Grimbly C, Diao CTM, French RJ. A high-conductance mode of a poly-3-hydroxybutyrate/calcium/polyphosphate channel isolated from competentEscherichia colicells. FEBS Lett 2005; 579:5187-92. [PMID: 16150446 DOI: 10.1016/j.febslet.2005.08.032] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2005] [Revised: 08/16/2005] [Accepted: 08/16/2005] [Indexed: 10/25/2022]
Abstract
Reconstitution into planar lipid bilayers of a poly-3-hydroxybutyrate/calcium/polyphosphate (PHB/Ca(2+)/polyP) complex from Escherichia coli membranes yields cationic-selective, 100 pS channels (Das, S., Lengweiler, U.D., Seebach, D. and Reusch, R.N. (1997) Proof for a non-proteinaceous calcium-selective channel in Escherichia coli by total synthesis from (R)-3-hydroxybutanoic acid and inorganic polyphosphate. Proc. Natl. Acad. Sci. USA 94, 9075-9079). Here, we report that this complex can also form larger, weakly selective pores, with a maximal conductance ranging from 250pS to 1nS in different experiments (symmetric 150mM KCl). Single channels were inhibited by lanthanum (IC(50)=42+/-4microM, means+/-S.E.M.) with an unusually high Hill coefficient (8.4+/-1.2). Transition to low-conductance states (<250pS) was favored by increased membrane polarization (/V/ >or=50mV). High conductance states (>250pS) may reflect conformations important for genetic transformability, or "competence", of the bacterial cells, which requires the presence of the PHB/Ca(2+)/polyP complex in the membrane.
Collapse
Affiliation(s)
- Evgeny Pavlov
- Hotchkiss Brain Institute, Department of Physiology and Biophysics, Faculty of Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, Alta., Canada T2N 4N1.
| | | | | | | |
Collapse
|