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Gangan MS, Naughton KL, Boedicker JQ. Utilizing a divalent metal ion transporter to control biogenic nanoparticle synthesis. J Ind Microbiol Biotechnol 2023; 50:kuad020. [PMID: 37587013 PMCID: PMC10481092 DOI: 10.1093/jimb/kuad020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 08/15/2023] [Indexed: 08/18/2023]
Abstract
Biogenic synthesis of inorganic nanomaterials has been demonstrated for both wild and engineered bacterial strains. In many systems the nucleation and growth of nanomaterials is poorly controlled and requires concentrations of heavy metals toxic to living cells. Here, we utilized the tools of synthetic biology to engineer a strain of Escherichia coli capable of synthesizing cadmium sulfide nanoparticles from low concentrations of reactants with control over the location of synthesis. Informed by simulations of bacterially-assisted nanoparticle synthesis, we created a strain of E. coli expressing a broad-spectrum divalent metal transporter, ZupT, and a synthetic CdS nucleating peptide. Expression of ZupT in the outer membrane and placement of the nucleating peptide in the periplasm focused synthesis within the periplasmic space and enabled sufficient nucleation and growth of nanoparticles at sub-toxic levels of the reactants. This strain synthesized internal CdS quantum dot nanoparticles with spherical morphology and an average diameter of approximately 3.3 nm. ONE-SENTENCE SUMMARY Expression of a metal ion transporter regulates synthesis of cadmium sulfide nanoparticles in bacteria.
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Affiliation(s)
- Manasi Subhash Gangan
- Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
| | - Kyle L Naughton
- Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
| | - James Q Boedicker
- Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
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Zheng Z, Cao H, Meng J, Xiao Y, Ulstrup J, Zhang J, Zhao F, Engelbrekt C, Xiao X. Synthesis and Structure of a Two-Dimensional Palladium Oxide Network on Reduced Graphene Oxide. NANO LETTERS 2022; 22:4854-4860. [PMID: 35639869 DOI: 10.1021/acs.nanolett.2c01226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
New nanostructures often reflect new and exciting properties. Here, we present an two-dimensional, hitherto unreported PdO square network with lateral dimensions up to hundreds of nanometers growing on reduced graphene oxide (rGO), forming a hybrid nanofilm. An intermediate state of dissolved Pd(0) in the bacterium S. oneidensis MR-1 is pivotal in the biosynthesis and inspires an abiotic synthesis. The PdO network shows a lattice spacing of 0.5 nm and a thickness of 1.8 nm on both sides of an rGO layer and is proposed to be cubic or tetragonal crystal, as confirmed by structural simulations. A 2D silver oxide analog with a similar structure is also obtained using an analogous abiotic synthesis. Our study thus opens a simple route to a whole new class of 2D metal oxides on rGO as promising candidates for graphene superlattices with unexplored properties and potential applications for example in electronics, sensing, and energy conversion.
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Affiliation(s)
- Zhiyong Zheng
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
| | - Huili Cao
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
| | - Jie Meng
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
| | - Yong Xiao
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen, 361021, China
| | - Jens Ulstrup
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
| | - Jingdong Zhang
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
| | - Feng Zhao
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen, 361021, China
| | - Christian Engelbrekt
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
| | - Xinxin Xiao
- Department of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Kongens Lyngby, DK-2800, Denmark
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