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Abstract
Tuning colloidal structure formation is a powerful approach to building functional materials, as a wide range of optical and viscoelastic properties can be accessed by the choice of individual building blocks and their interactions. Precise control is achieved by DNA specificity, depletion forces, or geometric constraints and results in a variety of complex structures. Due to the lack of control and reversibility of the interactions, an autonomous oscillating system on a mesoscale without external driving was not feasible until now. Here, we show that tunable DNA reaction circuits controlling linker strand concentrations can drive the dynamic and fully reversible assembly of DNA-functionalized micron-sized particles. The versatility of this approach is demonstrated by programming colloidal interactions in sequential and spatial order to obtain an oscillatory structure formation process on a mesoscopic scale. The experimental results represent an approach for the development of active materials by using DNA reaction networks to scale up the dynamic control of colloidal self-organization.
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Affiliation(s)
- H Dehne
- Center for Protein Assemblies (CPA) and Lehrstuhl für Biophysik (E27), Physics Departement, Technische Universität München, D-85748, Garching, Germany
| | - A Reitenbach
- Center for Protein Assemblies (CPA) and Lehrstuhl für Biophysik (E27), Physics Departement, Technische Universität München, D-85748, Garching, Germany
| | - A R Bausch
- Center for Protein Assemblies (CPA) and Lehrstuhl für Biophysik (E27), Physics Departement, Technische Universität München, D-85748, Garching, Germany.
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Dehne H, Reitenbach A, Bausch AR. Transient self-organisation of DNA coated colloids directed by enzymatic reactions. Sci Rep 2019; 9:7350. [PMID: 31089164 PMCID: PMC6517385 DOI: 10.1038/s41598-019-43720-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 04/16/2019] [Indexed: 11/16/2022] Open
Abstract
Dynamic self-organisation far from equilibrium is a key concept towards building autonomously acting materials. Here, we report the coupling of an antagonistic enzymatic reaction of RNA polymerisation and degradation to the aggregation of micron sized DNA coated colloids into fractal structures. A transient colloidal aggregation process is controlled by competing reactions of RNA synthesis of linker strands by a RNA polymerase and their degradation by a ribonuclease. By limiting the energy supply (NTP) of the enzymatic reactions, colloidal clusters form and subsequently disintegrate without the need of external stimuli. Here, the autonomous colloidal aggregation and disintegration can be modulated in terms of lifetime and cluster size. By restricting the enzyme activity locally, a directed spatial propagation of a colloidal aggregation and disintegration front is realised.
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Affiliation(s)
- H Dehne
- Lehrstuhl für Zellbiophysik, Technische Universität München, James-Franck-Str. 1, D-85748, Garching, Germany.
| | - A Reitenbach
- Lehrstuhl für Zellbiophysik, Technische Universität München, James-Franck-Str. 1, D-85748, Garching, Germany.
| | - A R Bausch
- Lehrstuhl für Zellbiophysik, Technische Universität München, James-Franck-Str. 1, D-85748, Garching, Germany
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3
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Abstract
The incorporation of monodisperse colloidal particles in hydrogels is a promising approach to create hybrid gels with unique structural, mechanical and functional properties. However, the colloidal structure formation within the hydrogels often remains uncontrolled, leaving behind possible mechanically synergetic effects of the polymeric and the colloidal system. Here we show that colloidal structure formation within the hybrid gels has a significant influence on the elasticity and toughness of the hybrid gels. We combine a polyacrylamide hydrogel with DNA coated colloids (DNAcc), where structure formation can be triggered independently at different points in time. Consequently, we are able to create hybrid gels that are composed of the same components, but do differ in explicit colloidal structure. While monodisperse colloids enhance the storage modulus of the gels, the yield strain is simultaneously drastically reduced. The toughness of these brittle hybrid gels is rescued by colloidal structure formation at higher polyacrylamide concentrations. The toughness is increased at lower polyacrylamide concentrations. We show that the toughness of the hydrogels at 10% (w/v) polyacrylamide and 4% (v/v) DNAcc can be increased by a factor of approx. 35, indicating that control over colloidal structure formation yields access to significant synergetic effects in polymer-colloid hybrid gels.
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Affiliation(s)
- H Dehne
- Lehrstuhl für Zellbiophysik E27, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
| | - F M Hecht
- Lehrstuhl für Zellbiophysik E27, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
| | - A R Bausch
- Lehrstuhl für Zellbiophysik E27, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany.
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Moncrief I, Garzon C, Marek S, Stack J, Gamliel A, Garrido P, Proaño F, Gard M, Dehne H, Fletcher J. Development of simple sequence repeat (SSR) markers for discrimination among isolates of Fusarium proliferatum. J Microbiol Methods 2016; 126:12-7. [PMID: 27021663 DOI: 10.1016/j.mimet.2016.03.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 03/11/2016] [Accepted: 03/21/2016] [Indexed: 10/22/2022]
Abstract
The plant pathogen Fusarium proliferatum has a wide host range and occurs worldwide. Many isolates of the fungus produce mycotoxins in plant tissues, which, if ingested, can cause harm to animals and humans. In 2008, an outbreak of salmon blotch of onions, caused by F. proliferatum, was detected in southern Israel. The source and distribution of the fungus in Israel were unknown. Inter-simple sequence repeats (ISSR) were used to identify repetitive motifs present in seven isolates of F. proliferatum from Israel, Germany and Austria. ISSR repeat motifs were, used to develop 17 simple sequence repeat (SSR) loci. Six of these SSR markers were polymorphic in and consistently amplified from ten isolates collected in Israel, Germany, Austria and North America, from cucumber, onion, garlic, maize, and asparagus. These six polymorphic SSR alleles included 5 to 12 copies of di-, tri, and pentanucleotide motifs and yielded six to 9 alleles each. Sixteen of the SSR loci were amplified at least one of the seven Fusarium species, F. verticillioides, F. thapsinum, F. subglutinans, F. andiyazi, F. globosum, F. fujikoroi and F. oxysporum. The data demonstrate that these SSRs can be used for characterization of F. proliferatum isolates from diverse hosts and geographic locations and that they are transferable to other species of Fusarium.
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Affiliation(s)
- I Moncrief
- Oklahoma State University, Stillwater, OK, United States
| | - C Garzon
- Oklahoma State University, Stillwater, OK, United States
| | - S Marek
- Oklahoma State University, Stillwater, OK, United States
| | - J Stack
- Kansas State University, Manhattan, KS, United States
| | - A Gamliel
- Laboratory for Pest management Research, Institute of Agricultural Engineering ARO, The Volcani Center, Bet Dagan, Israel
| | - P Garrido
- Oklahoma State University, Stillwater, OK, United States
| | - F Proaño
- Oklahoma State University, Stillwater, OK, United States
| | - M Gard
- Oklahoma State University, Stillwater, OK, United States
| | | | - J Fletcher
- Oklahoma State University, Stillwater, OK, United States
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Hans M, Schöffmann T, Dehne H, Matos EN. Strukturanalytische Untersuchungen an Folgeprodukten aus Sulfonamiden. VIII.Zur Struktur der Reaktionsprodukte aus 1,1,3-trisubst. Thioharnstoffen und N-Tosyl-iminothiokohlensäuremethylester-chlorid. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/prac.19913330415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Muthomi J, Dehne H, Oerke E, Mutitu E, Hindorf H. Characterisation offusarium graminearum andF. culmorum isolates by mycotoxin production and aggressiveness to wheat. Mycotoxin Res 2000; 16 Suppl 1:50-3. [PMID: 23605414 DOI: 10.1007/bf02942980] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A total of 27Fusarium culmorum isolates from Germany and 41F. graminearum isolates from Kenya were investigated for aggressiveness and mycotoxin production on wheat ears. In addition, ergosterol content of the kernels from ears inoculated withF. graminearum was determined and theF. culmorum isolates were tested for mycotoxin productionin vitro. For both pathogens, isolates markedly differed in aggressiveness. 59% and 37% of theF. culmorum isolates produced NIV and DON, respectively,in vivo andin vitro. The DON-producing isolates also produced 3-acDONin vitro. The more aggressive isolates produced mainly DON while the less aggressive isolates produced mainly NIV. 12% and 85% of theF. graminearum isolates produced NIV and DON, respectively. The highly aggressive isolates produced higher amounts of DON, aggressiveness being highly correlated to DON content in the kernels. NIV-producing isolates were less aggressive. Ergosterol content of kernels was moderately correlated to aggressiveness but highly correlated to DON content. Disease severity was associated with kernel weight reduction.
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Affiliation(s)
- J Muthomi
- Dept. of Crop Protection, University of Nairobi, P. O. Box 30197, Nairobi, Kenya
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Dobbertin J, Hannemann J, Schick C, Pötter M, Dehne H. Molecular dynamics of the α-relaxation during crystallization of a low-molecular-weight compound: A real-time dielectric spectroscopy study. J Chem Phys 1998. [DOI: 10.1063/1.476352] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Schick C, Dobbertin J, Pötter M, Dehne H, Hensel A, Wurm A, Ghoneim AM, Weyer S. Separation of components of different molecular mobility by calorimetry, dynamic mechanical and dielectric spectroscopy. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/bf01987477] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Dehne H, Chume P, Reinke H. Regioselective oxidation and halogenation of 2-(arylsulfenylimino)- and 2-(arylsulfinylimino)-4-thiazolines. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/prac.19963380182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hans M, Reinke H, Dehne H, Zeller K. Zur Synthese, Struktur und Reaktivit�t von 1,?-Bis(1-allyl-3-arylsulfonylisothioureido)alkanen. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/prac.19933350317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Teller J, Dehne H, Zimmermann T, Fischer GW, Olk B. Substituierte 2-Amino-thiazole aus ?-Thiocyanato-acetophenonen und Dialkylaminen. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/prac.19903320405] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Zimmermann T, Fischer GW, Teller J, Dehne H, Olk B. Substituierte N,N?-Bis(thiazol-2-yl)-diaminoalkane aus ?-Thiocyanato-acetophenonen und N,N?-Dialkyl-diamino-alkanen. ACTA ACUST UNITED AC 1990. [DOI: 10.1002/prac.19903320522] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rüttinger HH, Dehne H, Schroth W. [Reactivity and biological effect in the thiazole series. 1. A new synthesis of thiazole with the N-acylthioamides]. Pharmazie 1976; 31:218-21. [PMID: 935223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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15
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Dehne H, Wozniak KD. [Toxic and sensitizing properties of substituted aryl-trichloromethylcarbinols]. Z Gesamte Hyg 1973; 19:535-8. [PMID: 4271224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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