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Reinke O, Machill S, Brunner E. Polyamines of unique structure are integrated in Synura echinulata biosilica. Anal Bioanal Chem 2025:10.1007/s00216-025-05891-3. [PMID: 40332524 DOI: 10.1007/s00216-025-05891-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2025] [Revised: 04/17/2025] [Accepted: 04/23/2025] [Indexed: 05/08/2025]
Abstract
Unicellar, biomineralizing algae like diatoms or Synurales are ubiquitous in various habitats all over the world and have an outstanding role in different biogeochemical cycles. They are well known for their elaborate nanopatterned cell structures consisting of amorphous biosilica, which is intracellularly synthesized. Special biomolecules assist in the silica formation. In particular, species-specific long-chain polyamines (LCPAs) are commonly found in diatom biosilica and seem to play a special role due to their ability to self-assemble and induce silica precipitation. In contrast to diatoms, no species from the order Synurales have been tested yet for the presence of LCPAs. Therefore, the present work deals with the analysis of Synura echinulata biosilica using a novel HPLC-HR-MS/MS method. The presence of unique LCPAs is shown, and their structure is elucidated via MS/MS experiments. LCPAs from S. echinulata are based on amino butyl repeat units-in contrast to all previously described LCPAs from other organisms, which are based on aminopropyl repeat units. The ubiquitous presence of LCPAs in biomineralizing species strongly indicates a general role of LCPAs in silica biomineralization.
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Affiliation(s)
- Oliver Reinke
- Chair for Bioanalytical Chemistry, TU Dresden, Dresden, 01062, Germany
| | - Susanne Machill
- Chair for Bioanalytical Chemistry, TU Dresden, Dresden, 01062, Germany
| | - Eike Brunner
- Chair for Bioanalytical Chemistry, TU Dresden, Dresden, 01062, Germany.
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2
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Brandis D, Mollica G, Kurzbach D. R5 Peptides Constitute Condensed Phases with Liquid-Like Properties in Biomimetic Silica Capsules. J Phys Chem Lett 2025; 16:4326-4335. [PMID: 40267258 PMCID: PMC12051205 DOI: 10.1021/acs.jpclett.5c00144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2025] [Revised: 04/12/2025] [Accepted: 04/18/2025] [Indexed: 04/25/2025]
Abstract
Biomimetic silica-peptide nanocomposites are promising materials for applications in drug delivery and enzyme encapsulation due to their biocompatibility, tunable morphologies, and unique structural characteristics. However, the structural dynamics of the peptide scaffold remain largely elusive, impeding rational biomimetic materials design. This shortcoming is not the least due to a lack of methods that can access such heterogeneous systems with dynamics on a wide range of time scales. Among the most studied candidates are silica particles templated by the diatom-derived peptide R5, known for its ability to guide silica precipitation under mild, toxicologically friendly conditions, leading to silica capsules filled with a peptide scaffold. Here, we describe the structural dynamics of R5 within its self-assemblies and the silica particles it templates with a combination of advanced magnetic resonance methods, including 13C-direct detected NMR, site-directive spin-labeling EPR, and sensitivity-enhanced solid-state NMR. We provide evidence that R5 self-assemblies form condensed phases with liquid-like dynamics both before and after silica encapsulation. Our suite of methods allowed us to access R5/silica composites over a comprehensive range of time scales. These results demonstrate that R5 retains a remarkable degree of internal dynamics, with distinct regions of solid-like and liquid-like behavior even within the silica particles. Specifically, the peptide scaffold comprises three dynamic species: (i) solid-like at the peptide-silica interface, (ii) liquid-like mobility within the scaffold core, and (iii) intermediate dynamics at the boundary regions between core and interface species. Our findings rationalize the high mobility of guest molecules, such as drugs or enzyme substrates, within R5-silica nanoparticles, which is crucial for their functionality in controlled release and catalytic applications. This understanding paves the way for improved rational design considerations for advanced nanomaterials and expands our knowledge of biomimetic mineralization mechanisms. At the same time, the methodological approach can be useful for many types of peptide-guided biominerals, bridging fundamental biochemistry with biotechnological innovation.
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Affiliation(s)
- Dörte Brandis
- Institute
of Biological Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria
- University
of Vienna, Vienna Doctoral
School in Chemistry (DoSChem), Währinger Str. 42, 1090 Vienna, Austria
| | | | - Dennis Kurzbach
- Institute
of Biological Chemistry, Faculty of Chemistry, University of Vienna, Währinger Str. 38, 1090 Vienna, Austria
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3
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Abdelhamid MAA, Son RG, Ki MR, Pack SP. Biosilica-coated carbonic anhydrase displayed on Escherichia coli: A novel design approach for efficient and stable biocatalyst for CO 2 sequestration. Int J Biol Macromol 2024; 277:134058. [PMID: 39038576 DOI: 10.1016/j.ijbiomac.2024.134058] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 07/17/2024] [Accepted: 07/19/2024] [Indexed: 07/24/2024]
Abstract
A robust and stable carbonic anhydrase (CA) system is indispensable for effectively sequestering carbon dioxide to mitigate climate change. While microbial surface display technology has been employed to construct an economically promising cell-displayed CO2-capturing biocatalyst, the displayed CA enzymes were prone to inactivation due to their low stability in harsh conditions. Herein, drawing inspiration from biomineralized diatom frustules, we artificially introduced biosilica shell materials to the CA macromolecules displayed on Escherichia coli surfaces. Specifically, we displayed a fusion of CA and the diatom-derived silica-forming Sil3K peptide (CA-Sil3K) on the E. coli surface using the membrane anchor protein Lpp-OmpA linker. The displayed CA-Sil3K (dCA-Sil3K) fusion protein underwent a biosilicification reaction under mild conditions, resulting in nanoscale self-encapsulation of the displayed enzyme in biosilica. The biosilicified dCA-Sil3K (BS-dCA-Sil3K) exhibited improved thermal, pH, and protease stability and retained 63 % of its initial activity after ten reuses. Additionally, the BS-dCA-Sil3K biocatalyst significantly accelerated the CaCO3 precipitation rate, reducing the time required for the onset of CaCO3 formation by 92 % compared to an uncatalyzed reaction. Sedimentation of BS-dCA-Sil3K on a membrane filter demonstrated a reliable CO2 hydration application with superior long-term stability under desiccation conditions. This study may open new avenues for the nanoscale-encapsulation of enzymes with biosilica, offering effective strategies to provide efficient, stable, and economic cell-displayed biocatalysts for practical applications.
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Affiliation(s)
- Mohamed A A Abdelhamid
- Department of Biotechnology and Bioinformatics, Korea University, Sejong-Ro 2511, Sejong 30019, Republic of Korea; Department of Botany and Microbiology, Faculty of Science, Minia University, Minia 61519, Egypt
| | - Ryeo Gang Son
- Department of Biotechnology and Bioinformatics, Korea University, Sejong-Ro 2511, Sejong 30019, Republic of Korea
| | - Mi-Ran Ki
- Department of Biotechnology and Bioinformatics, Korea University, Sejong-Ro 2511, Sejong 30019, Republic of Korea; Institute of Industrial Technology, Korea University, Sejong-Ro 2511, Sejong 30019, Republic of Korea
| | - Seung Pil Pack
- Department of Biotechnology and Bioinformatics, Korea University, Sejong-Ro 2511, Sejong 30019, Republic of Korea.
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Can sustainable, monodisperse, spherical silica be produced from biomolecules? A review. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01869-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Curley R, Banta RA, Garvey S, Holmes JD, Flynn EJ. Biomimetic spherical silica production using phosphatidylcholine and soy lecithin. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01839-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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6
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Montagna M, Brückner SI, Dianat A, Gutierrez R, Daus F, Geyer A, Brunner E, Cuniberti G. Interactions of Long-Chain Polyamines with Silica Studied by Molecular Dynamics Simulations and Solid-State NMR Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11600-11609. [PMID: 32924496 DOI: 10.1021/acs.langmuir.0c02157] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The investigation of molecular interactions between silica phases and organic components is crucial for elucidating the main steps involved in the biosilica mineralization process. In this respect, the structural characterization of the organic/inorganic interface is particularly useful for a deeper understanding of the dominant mechanisms of biomineralization. In this work, we have investigated the interaction of selectively 13C- and 15N-labeled atoms of organic long-chain polyamines (LCPAs) with 29Si-labeled atoms of a silica layer at the molecular level. In particular, silica/LCPA nanocomposites were analyzed by solid-state NMR spectroscopy in combination with all-atom molecular dynamics simulations. Solid-state NMR experiments allow the determination of 29Si-15N and 29Si-13C internuclear distances, providing the parameters for direct verification of atomistic simulations. Our results elucidate the relevant molecular conformations as well as the nature of the interaction between the LCPA and a silica substrate. Specifically, distances and second moments suggest a picture compatible with (i) LCPA completely embedded in the silica phase and (ii) the charged amino groups located in close vicinity of silanol groups.
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Affiliation(s)
- Maria Montagna
- Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
| | - Stephan Ingmar Brückner
- Chair of Bioanalytical Chemistry, Faculty of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Arezoo Dianat
- Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
| | - Rafael Gutierrez
- Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
| | - Fabian Daus
- Department of Chemistry, Philipps-University Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Armin Geyer
- Department of Chemistry, Philipps-University Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Eike Brunner
- Chair of Bioanalytical Chemistry, Faculty of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Gianaurelio Cuniberti
- Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany
- Dresden Center for Computational Materials Science, TU Dresden, 01062 Dresden, Germany
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Gericke R, Gondek C, Stapf A, Wagler J, Kroke E, Brendler E. Convenient two step synthesis of 29Si labelled tetraalkoxysilanes. Chem Commun (Camb) 2020; 56:13631-13633. [DOI: 10.1039/d0cc05525e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Starting from silicon dioxide or silicon a scalable, reliable synthesis of 29Si enriched tetraethoxysilane, an essential sol–gel precursor, is presented.
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Affiliation(s)
- Robert Gericke
- Technische Universität Bergakademie Freiberg
- Department of Chemistry and Physics
- Institute of Inorganic Chemistry
- 09599 Freiberg
- Germany
| | - Christoph Gondek
- Technische Universität Bergakademie Freiberg
- Department of Chemistry and Physics
- Institute of Inorganic Chemistry
- 09599 Freiberg
- Germany
| | - André Stapf
- Technische Universität Bergakademie Freiberg
- Department of Chemistry and Physics
- Institute of Inorganic Chemistry
- 09599 Freiberg
- Germany
| | - Jörg Wagler
- Technische Universität Bergakademie Freiberg
- Department of Chemistry and Physics
- Institute of Inorganic Chemistry
- 09599 Freiberg
- Germany
| | - Edwin Kroke
- Technische Universität Bergakademie Freiberg
- Department of Chemistry and Physics
- Institute of Inorganic Chemistry
- 09599 Freiberg
- Germany
| | - Erica Brendler
- Technische Universität Bergakademie Freiberg
- Department of Chemistry and Physics
- Institute of Analytical Chemistry
- 09599 Freiberg
- Germany
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