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Aggregation-Based Bacterial Separation with Gram-Positive Selectivity by Using a Benzoxaborole-Modified Dendrimer. Molecules 2023; 28:molecules28041704. [PMID: 36838690 PMCID: PMC9958924 DOI: 10.3390/molecules28041704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/06/2023] [Accepted: 02/06/2023] [Indexed: 02/12/2023] Open
Abstract
Antimicrobial-resistant (AMR) bacteria have become a critical global issue in recent years. The inefficacy of antimicrobial agents against AMR bacteria has led to increased difficulty in treating many infectious diseases. Analyses of the environmental distribution of bacteria are important for monitoring the AMR problem, and a rapid as well as viable pH- and temperature-independent bacterial separation method is required for collecting and concentrating bacteria from environmental samples. Thus, we aimed to develop a useful and selective bacterial separation method using a chemically synthesized nanoprobe. The metal-free benzoxaborole-based dendrimer probe BenzoB-PAMAM(+), which was synthesized from carboxy-benzoxaborole and a poly(amidoamine) (PAMAM) dendrimer, could help achieve Gram-positive bacterial separation by recognizing Gram-positive bacterial surfaces over a wide pH range, leading to the formation of large aggregations. The recognition site of benzoxaborole has a desirable high acidity and may therefore be responsible for the improved Gram-positive selectivity. The Gram-positive bacterial aggregation was then successfully collected by using a 10 μm membrane filter, with Gram-negative bacteria remaining in the filtrate solution. BenzoB-PAMAM(+) will thus be useful for application in biological analyses and could contribute to further investigations of bacterial distributions in environmental soil or water.
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Suzuki Y, Hashimoto T, Hayashita T. Ratiometric fluorescence sensing of d-allulose using an inclusion complex of γ-cyclodextrin with a benzoxaborole-based probe. RSC Adv 2022; 12:12145-12151. [PMID: 35481078 PMCID: PMC9021936 DOI: 10.1039/d2ra00749e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 04/08/2022] [Indexed: 11/21/2022] Open
Abstract
Because d-allulose has been attracting attention as a zero-calorie sugar, the selective sensing of d-allulose is desired to investigate its health benefits. We report herein a novel fluorescence chemosensor that is based on an inclusion complex of γ-cyclodextrin (γ-CyD) with a benzoxaborole-based probe. Two inclusion complexes, 1/γCyD and 2/γCyD, were prepared by mixing γ-CyD with their corresponding probes in a water-rich solvent, where γ-CyD encapsulates two molecules of the probes inside its cavity to form a pyrene dimer. Both 1/γCyD and 2/γCyD exhibit monomeric and dimeric fluorescence from the pyrene moieties. By the reaction of 1/γCyD with saccharides, the intensities of monomeric and dimeric fluorescence remained unchanged and decreased, respectively. We have demonstrated that 1/γCyD has much higher affinity for d-allulose than for the other saccharides (d-fructose, d-glucose, and d-galactose). The conditional equilibrium constants for the reaction systems were determined to be 498 ± 35 M-1 for d-fructose, 48.4 ± 25.3 M-1 for d-glucose, 15.0 ± 3.3 M-1 for d-galactose, and (8.05 ± 0.59) × 103 M-1 for d-allulose. These features of 1/γCyD enable ratiometric fluorescence sensing with high sensitivity and selectivity for d-allulose. The limits of detection and quantification of 1/γCyD for d-allulose at pH 8.0 were determined to be 6.9 and 21 μM, respectively. Induced circular dichroism spectral study has shown that the reaction of 1/γCyD with d-allulose causes the monomerisation of the dimer of probe 1 that is encapsulated by γ-CyD, which leads to the diminishment of the dimeric fluorescence.
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Affiliation(s)
- Yota Suzuki
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University 7-1, Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan
| | - Takeshi Hashimoto
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University 7-1, Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan
| | - Takashi Hayashita
- Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University 7-1, Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan
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Hulgan SAH, Hartgerink JD. Recent Advances in Collagen Mimetic Peptide Structure and Design. Biomacromolecules 2022; 23:1475-1489. [PMID: 35258280 DOI: 10.1021/acs.biomac.2c00028] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Collagen mimetic peptides (CMPs) fold into a polyproline type II triple helix, allowing the study of the structure and function (or misfunction) of the collagen family of proteins. This Perspective will focus on recent developments in the use of CMPs toward understanding the structure and controlling the stability of the triple helix. Triple helix assembly is influenced by various factors, including the single amino acid propensity for the triple helix fold, pairwise interactions between these amino acids, and long-range effects observed across the helix, such as bend, twist, and fraying. Important progress in creating a comprehensive and predictive understanding of these factors for peptides with exclusively natural amino acids has been made. In contrast, several groups have successfully developed unnatural amino acids that are engineered to stabilize the triple helical structure. A third approach to controlling the triple helical structure includes covalent cross-linking of the triple helix to stabilize the assembly, which eliminates the problematic equilibrium of unfolding into monomers and enforces compositional control. Advances in all these areas have resulted in significant improvements to our understanding and control of this important class of protein, allowing for the design and application of more chemically complex and well-controlled collagen mimetic biomaterials.
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Affiliation(s)
- Sarah A H Hulgan
- Rice University, Department of Chemistry, 6100 Main Street, Houston, Texas 77005, United States
| | - Jeffrey D Hartgerink
- Rice University, Department of Chemistry, 6100 Main Street, Houston, Texas 77005, United States
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Hulgan SAH, Jalan AA, Li IC, Walker DR, Miller MD, Kosgei AJ, Xu W, Phillips GN, Hartgerink JD. Covalent Capture of Collagen Triple Helices Using Lysine–Aspartate and Lysine–Glutamate Pairs. Biomacromolecules 2020; 21:3772-3781. [DOI: 10.1021/acs.biomac.0c00878] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Sarah A. H. Hulgan
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Abhishek A. Jalan
- Department of Biochemistry, University of Bayreuth, Bayreuth 95447, Germany
| | - I-Che Li
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Douglas R. Walker
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Mitchell D. Miller
- Department of Biosciences, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Abigael J. Kosgei
- Department of Biosciences, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Weijun Xu
- Department of Biosciences, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - George N. Phillips
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department of Biosciences, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Jeffrey D. Hartgerink
- Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
- Department of Bioengineering, Rice University, 6100 Main Street, Houston, Texas 77005, United States
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Abstract
The combination of supramolecular aggregation of collagen model peptides with reversible covalent end‐capping of the formed triple helix in a single experimental set‐up yielded minicollagens, which were characterized by a single melting temperature. In spite of the numerous possible reaction intermediates, a specific synthetic collagen with a leading, middle and trailing strand is formed in a highly cooperative self‐assembly process.
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Affiliation(s)
- Christoph Priem
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032, Marburg, Germany
| | - Armin Geyer
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032, Marburg, Germany
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