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Zeng C, Jian Y, Zhuo C, Li A, Zeng C, Zhao Y. Evaluation of DNA-protein complex structures using the deep learning method. Phys Chem Chem Phys 2023; 26:130-143. [PMID: 38063012 DOI: 10.1039/d3cp04980a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Biological processes such as transcription, repair, and regulation require interactions between DNA and proteins. To unravel their functions, it is imperative to determine the high-resolution structures of DNA-protein complexes. However, experimental methods for this purpose are costly and technically demanding. Consequently, there is an urgent need for computational techniques to identify the structures of DNA-protein complexes. Despite technological advancements, accurately identifying DNA-protein complexes through computational methods still poses a challenge. Our team has developed a cutting-edge deep-learning approach called DDPScore that assesses DNA-protein complex structures. DDPScore utilizes a 4D convolutional neural network to overcome limited training data. This approach effectively captures local and global features while comprehensively considering the conformational changes arising from the flexibility during the DNA-protein docking process. DDPScore consistently outperformed the available methods in comprehensive DNA-protein complex docking evaluations, even for the flexible docking challenges. DDPScore has a wide range of applications in predicting and designing structures of DNA-protein complexes.
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Affiliation(s)
- Chengwei Zeng
- Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, 430079, China.
| | - Yiren Jian
- Department of Computer Science, Dartmouth College, Hanover, NH 03755, USA
| | - Chen Zhuo
- Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, 430079, China.
| | - Anbang Li
- Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, 430079, China.
| | - Chen Zeng
- Department of Physics, The George Washington University, Washington, DC 20052, USA
| | - Yunjie Zhao
- Institute of Biophysics and Department of Physics, Central China Normal University, Wuhan, 430079, China.
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Esmaeeli R, Bauzá A, Perez A. Structural predictions of protein-DNA binding: MELD-DNA. Nucleic Acids Res 2023; 51:1625-1636. [PMID: 36727436 PMCID: PMC9976882 DOI: 10.1093/nar/gkad013] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/27/2022] [Accepted: 01/30/2023] [Indexed: 02/03/2023] Open
Abstract
Structural, regulatory and enzymatic proteins interact with DNA to maintain a healthy and functional genome. Yet, our structural understanding of how proteins interact with DNA is limited. We present MELD-DNA, a novel computational approach to predict the structures of protein-DNA complexes. The method combines molecular dynamics simulations with general knowledge or experimental information through Bayesian inference. The physical model is sensitive to sequence-dependent properties and conformational changes required for binding, while information accelerates sampling of bound conformations. MELD-DNA can: (i) sample multiple binding modes; (ii) identify the preferred binding mode from the ensembles; and (iii) provide qualitative binding preferences between DNA sequences. We first assess performance on a dataset of 15 protein-DNA complexes and compare it with state-of-the-art methodologies. Furthermore, for three selected complexes, we show sequence dependence effects of binding in MELD predictions. We expect that the results presented herein, together with the freely available software, will impact structural biology (by complementing DNA structural databases) and molecular recognition (by bringing new insights into aspects governing protein-DNA interactions).
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Affiliation(s)
- Reza Esmaeeli
- Department of Chemistry, Quantum theory project, University of Florida, Gainesville, FL 32611, USA
| | - Antonio Bauzá
- Department of Chemistry, Universitat de les Illes Balears, Palma de Mallorca (Baleares), 07122, Spain
| | - Alberto Perez
- Department of Chemistry, Quantum theory project, University of Florida, Gainesville, FL 32611, USA
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Zhu T, Chen J, Chai Q, Zeng S, Liu Y. Stable and sensitive sensor for alkaline phosphatase based on target-triggered wavelength tuning of fluorescent copper nanoclusters. Anal Chim Acta 2022; 1232:340453. [DOI: 10.1016/j.aca.2022.340453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/23/2022] [Accepted: 09/25/2022] [Indexed: 11/01/2022]
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Lin L, Li B, Han X, Zhang F, Zhang X, Linhardt RJ. A rolling circle amplification based platform for ultrasensitive detection of heparin. Analyst 2021; 146:714-720. [PMID: 33226386 PMCID: PMC7855511 DOI: 10.1039/d0an02061c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Heparin has a variety of pharmacological uses, including applications for anti-tumor metastasis, anti-inflammatory and anti-viral activities and is widely used as a clinical anticoagulant. Due to its widespread applications in the clinical procedures, monitoring heparin levels is critically important to ensure the safe use of heparin and to prevent overdose and complications, such as hemorrhage and thrombocytopenia. However, traditional heparin detection relies on the measurements of the activated clotting time or activated partial thromboplastin time, which are not sufficiently reliable or accurate measurements for certain clinical settings. In this work, we describe a dumbbell probe-aided strategy for ultrasensitive and isothermal detection of heparin based on a uniquely strong protamine-heparin interaction and rolling circle amplification driven signal amplification. The detection limit for heparin is 12.5 ng mL-1 (0.83 nM), which is much lower than the therapeutic level of heparin in cardiovascular surgery (17-67 μM) and in postoperative and long-term treatment (1.7-10 μM). Additionally, the proposed sensing platform works well for heparin monitoring in human plasma samples. This simple and ultrasensitive heparin biosensor has potential application in diagnostics, therapeutics, and in biological research.
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Affiliation(s)
- Lei Lin
- School of Environment, Nanjing Normal University, Wenyuan Road 1, Nanjing 210023, China
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Ge J, Chen X, Yang J, Wang Y. Progress in electrochemiluminescence of nanoclusters: how to improve the quantum yield of nanoclusters. Analyst 2021; 146:803-815. [DOI: 10.1039/d0an02110e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Classification of nanoclusters and methods to improve their quantum yield and applications.
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Affiliation(s)
- Junjun Ge
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Xufeng Chen
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Jinling Yang
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Yuanyuan Wang
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
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Mu WY, Yang R, Robertson A, Chen QY. A near-infrared BSA coated DNA-AgNCs for cellular imaging. Colloids Surf B Biointerfaces 2017; 162:427-431. [PMID: 29258055 DOI: 10.1016/j.colsurfb.2017.12.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 12/01/2017] [Accepted: 12/12/2017] [Indexed: 01/28/2023]
Abstract
Near-infrared silver nanoclusters, have potential applications in the field of biosensing and biological imaging. However, less stability of most DNA-AgNCs limits their application. To obtain stable near-infrared fluorescence DNA-AgNCs for biological imaging, a new kind of near-infrared fluorescent DNA-Ag nanoclusters was constructed using the C3A rich aptamer as a synthesis template, GAG as the enhancer. In particular, a new DNA-AgNCs-Trp@BSA was obtained based on the self-assembly of bovine serum albumin (BSA) and tryptophan loaded DNA-AgNCs by hydrophobic interaction. This self-assembly method can be used to stabilize DNAn-Ag (n = 1-3) nanoclusters. Hence, the near-infrared fluorescence DNA-AgNCs-Trp@BSA was applied in cellular imaging of HepG-2 cells.
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Affiliation(s)
- Wei-Yu Mu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China
| | - Rui Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China
| | - Akrofi Robertson
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China
| | - Qiu-Yun Chen
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, PR China.
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Hu Y, Xie D, Wu Y, Lin N, Song A, Hao J. Hydrogels Based on Ag + -Modulated Assembly of 5'-Adenosine Monophosphate for Enriching Biomolecules. Chemistry 2017; 23:15721-15728. [PMID: 28833801 DOI: 10.1002/chem.201703180] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Indexed: 12/18/2022]
Abstract
Supramolecular hydrogels obtained by combining 5'-adenosine monophosphate (AMP) with Ag+ were fabricated in this work. Their gelation capability was enhanced by increasing the concentration of Ag+ or decreasing the pH. The gels are very sensitive to light, which endows them with potential applications as visible-light photosensitive materials. Coordination between the nucleobase of AMP and Ag+ , as well as π-π stacking of nucleobases, are considered to be the main driving forces for self-assembly. The hydrogels successfully achieved the encapsulation and enrichment of biomolecules. Hydrogen bonding between the amino group of guest molecules and silver nanoparticles along the nanofibers drives the enrichment and is considered to be a crucial interaction.
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Affiliation(s)
- Yuanyuan Hu
- Key Laboratory of Colloid and Interface Chemistry, & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
| | - Dong Xie
- Key Laboratory of Colloid and Interface Chemistry, & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
| | - Yang Wu
- Key Laboratory of Colloid and Interface Chemistry, & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
| | - Nangui Lin
- Key Laboratory of Colloid and Interface Chemistry, & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
| | - Aixin Song
- Key Laboratory of Colloid and Interface Chemistry, & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
| | - Jingcheng Hao
- Key Laboratory of Colloid and Interface Chemistry, & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, P.R. China
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Jiang H, Liu L, Wang X. Red-emitted electrochemiluminescence by yellow fluorescent thioglycol/glutathione dual thiolate co-coated Au nanoclusters. NANOSCALE 2017; 9:9792-9796. [PMID: 28681898 DOI: 10.1039/c7nr03382f] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This study reports the occurrence of a special red-emitted anodic electrochemiluminescence (ECL) emission at +1.4 V (vs. Ag/AgCl) on a glass carbon electrode (GCE) after the addition of thioglycol (TG) to surface-unsaturated glutathione (GSH)-coated Au nanoclusters (NCs), with an emission peak at ∼630 nm. Compared to the ECL at a potential of +1.8 V (vs. Ag/AgCl) and an emission peak at 580 nm (corresponding to fluorescence) for only GSH-coated Au NCs, this ECL emission not only exhibits a lower ECL potential but also shows a significantly red-shifted emission wavelength up to ∼50 nm. We demonstrated that the formation of TG/GSH dual ligand-coated Au NCs is responsible for the red-shifted ECL emission. Other common thiol compounds cannot result in similar effect on GCE, and no ECL is observed on other electrodes such as indium tin oxide and platinum electrodes. This finding offers a great possibility to design novel feasible ECL systems for different complicated applications.
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Affiliation(s)
- Hui Jiang
- State Key Laboratory of Bioelectronics, National Demonstration Center for Experimental Biomedical Engineering Education (Southeast University), School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China.
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Chen H, Lin L, Li H, Li J, Lin JM. Aggregation-induced structure transition of protein-stabilized zinc/copper nanoclusters for amplified chemiluminescence. ACS NANO 2015; 9:2173-2183. [PMID: 25647180 DOI: 10.1021/acsnano.5b00141] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A stable, water-soluble fluorescent Zn/Cu nanocluster (NC) capped with a model protein, bovine serum albumin (BSA), was synthesized and applied to the reaction of hydrogen peroxide and sodium hydrogen carbonate. A significantly amplified chemiluminescence (CL) from the accelerated decomposition of peroxymonocarbonate (HCO4(-)) by the nanosluster was observed. The CL reaction led to a structure change of BSA and aggregation of Zn/Cu NCs. In the presence of H2O2, Zn/Cu-S bonding between BSA scaffolds and the encapsulated Zn/Cu@BSA NC was oxidized to form a disulfide product. Zn/Cu@BSA NCs were prone to aggregate to form larger nanoparticles without the protection of scaffolds. It is revealed that the strong CL emission was initiated from the catalysis of Zn/Cu@BSA NC and the surface plasmon coupling of the formed Zn/Cu nanoparticles in a single chemical reaction. This amplified CL was successfully exploited for selective sensing of hydrogen peroxide in environmental samples.
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Affiliation(s)
- Hui Chen
- MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University , Beijing, 100083, China
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