Applied Magnetic Resonance最新文献_第10页

Nonlinear Chirp Sequence for Broadband (pi ) Rotation Using Hyperbolic Secant Pulse 利用双曲正割脉冲实现宽带旋转的非线性啁啾序列

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-11-14 DOI: 10.1007/s00723-023-01630-y

Sambeda Sarkar, Pradyumna Paruchuri, Navin Khaneja

引用次数: 0

Bernhard Blümich: On the Occasion of His 70th Birthday 伯恩哈德·布尔<e:1>米奇:在他70岁生日之际

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-11-10 DOI: 10.1007/s00723-023-01631-x

Matthew Augustine, Peter Blümler, Jeffrey Reimer

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Glutathione-Responsive T1 Contrast Agent for Tumor Imaging 用于肿瘤成像的谷胱甘肽响应性 T1 对比剂

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-11-09 DOI: 10.1007/s00723-023-01629-5

Xueqin Wang, Xi Ye, Xiaoping Qin, Yi Fu, Hong Tang

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Correction: Dynamic Nature of Proteins is Critically Important for Their Function: GPCRs and Signal Transducers 更正：蛋白质的动态性质对其功能至关重要：GPCR 和信号转换器

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-11-04 DOI: 10.1007/s00723-023-01627-7

Vsevolod V. Gurevich, Eugenia V. Gurevich

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Quantitative Analysis in Continuous-Flow (^1)H Benchtop NMR Spectroscopy by Paramagnetic Relaxation Enhancement 顺磁弛豫增强的连续流动H台式核磁共振光谱定量分析(^1)

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-11-03 DOI: 10.1007/s00723-023-01626-8

Raphael Kircher, Sarah Mross, Hans Hasse, Kerstin Münnemann

{"title":"Quantitative Analysis in Continuous-Flow (^1)H Benchtop NMR Spectroscopy by Paramagnetic Relaxation Enhancement","authors":"Raphael Kircher, Sarah Mross, Hans Hasse, Kerstin Münnemann","doi":"10.1007/s00723-023-01626-8","DOIUrl":"10.1007/s00723-023-01626-8","url":null,"abstract":"<div><p>Nuclear magnetic resonance (NMR) spectroscopy is an excellent tool for reaction and process monitoring. Process monitoring is often carried out online, where the analytic device is operated in flow mode. Benchtop NMR spectrometers are especially well-suited for these applications because they can be installed close to the studied process. However, quantitative analysis of a fast-flowing liquid with NMR spectroscopy is challenging because short residence times in the magnetic field of the spectrometer result in inefficient polarization buildup and thus poor signal intensity. This is particularly problematic for benchtop NMR spectrometers, where it severely limits the flow velocity in quantitative measurements. One method for increasing polarization in continuous-flow NMR spectroscopy is paramagnetic relaxation enhancement (PRE). Here, the interaction of the studied liquid with a PRE agent significantly accelerates the buildup of nuclear polarization prior to NMR detection, which enables quantitative measurements at high flow velocities. For process monitoring applications, the synthesis of robust and chemically inert immobilized PRE agents is mandatory. This was accomplished in the present work, where a new PRE agent is tested on 12 common solvents including water, acetonitrile, 1,4-dioxane, and binary mixtures with quantitative benchtop <span>(^1)</span>H NMR spectroscopy at 1 Tesla. The results show that the flow regime for quantitative measurements can be greatly extended by the use of the synthesized PRE agent.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"54 11-12","pages":"1555 - 1569"},"PeriodicalIF":1.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-023-01626-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135818567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron Paramagnetic Resonance Applied to Free Radicals and Reactive Oxygen Species Detection in Plant Systems 电子顺磁共振应用于植物系统中的自由基和活性氧检测

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-10-26 DOI: 10.1007/s00723-023-01625-9

Francine A. F. Menezes, Jurandi G. Oliveira, André O. Guimarães

{"title":"Electron Paramagnetic Resonance Applied to Free Radicals and Reactive Oxygen Species Detection in Plant Systems","authors":"Francine A. F. Menezes, Jurandi G. Oliveira, André O. Guimarães","doi":"10.1007/s00723-023-01625-9","DOIUrl":"10.1007/s00723-023-01625-9","url":null,"abstract":"<div><p>Electron paramagnetic resonance (EPR) is a non-invasive and highly sensitive technique that has been extensively used for detecting free radicals and reactive oxygen species (ROS) in biological systems. In plant biology, ROS are highly reactive and play a critical role in regulating various cellular processes. However, detecting ROS in plant systems is challenging due to their short half-life and low concentrations. This review presents a comprehensive overview of the application of EPR for the detection of free radicals and ROS in plant systems, including a comparison with other methods. Furthermore, it explores the utilization of the spin trapping method in combination with EPR for ROS detection, providing spectroscopic parameters for numerous spin trap compounds. We highlight some of the relevant studies that used EPR spectroscopy to detect ROS, as well as stable radicals, in plant systems. This review serves as a valuable resource for researchers interested in using EPR spectroscopy for free radicals and ROS detection in plant systems and provides insights into the current state of the field and future research trends.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 4","pages":"335 - 355"},"PeriodicalIF":1.1,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136381544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Highly Ordered Nitroxide Side Chain for Distance Mapping and Monitoring Slow Structural Fluctuations in Proteins 用于绘制距离图和监测蛋白质缓慢结构波动的高度有序的亚硝基侧链

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-10-14 DOI: 10.1007/s00723-023-01618-8

Mengzhen Chen, Tamás Kálai, Duilio Cascio, Michael D. Bridges, Julian P. Whitelegge, Matthias Elgeti, Wayne L. Hubbell

{"title":"A Highly Ordered Nitroxide Side Chain for Distance Mapping and Monitoring Slow Structural Fluctuations in Proteins","authors":"Mengzhen Chen, Tamás Kálai, Duilio Cascio, Michael D. Bridges, Julian P. Whitelegge, Matthias Elgeti, Wayne L. Hubbell","doi":"10.1007/s00723-023-01618-8","DOIUrl":"10.1007/s00723-023-01618-8","url":null,"abstract":"<div><p>Site-directed spin labeling electron paramagnetic resonance (SDSL-EPR) is an established tool for exploring protein structure and dynamics. Although nitroxide side chains attached to a single cysteine via a disulfide linkage are commonly employed in SDSL-EPR, their internal flexibility complicates applications to monitor slow internal motions in proteins and to structure determination by distance mapping. Moreover, the labile disulfide linkage prohibits the use of reducing agents often needed for protein stability. To enable the application of SDSL-EPR to the measurement of slow internal dynamics, new spin labels with hindered internal motion are desired. Here, we introduce a highly ordered nitroxide side chain, designated R9, attached at a single cysteine residue via a non-reducible thioether linkage. The reaction to introduce R9 is highly selective for solvent-exposed cysteine residues. Structures of R9 at two helical sites in T4 Lysozyme were determined by X-ray crystallography and the mobility in helical sequences was characterized by EPR spectral lineshape analysis, Saturation Transfer EPR, and Saturation Recovery EPR. In addition, interspin distance measurements between pairs of R9 residues are reported. Collectively, all data indicate that R9 will be useful for monitoring slow internal structural fluctuations, and applications to distance mapping via dipolar spectroscopy and relaxation enhancement methods are anticipated.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 1-3","pages":"251 - 277"},"PeriodicalIF":1.1,"publicationDate":"2023-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-023-01618-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135766151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural Dynamics of Protein Interactions Using Site-Directed Spin Labeling of Cysteines to Measure Distances and Rotational Dynamics with EPR Spectroscopy 利用半胱氨酸的定点自旋标记测量距离和 EPR 光谱的旋转动力学研究蛋白质相互作用的结构动力学

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-10-11 DOI: 10.1007/s00723-023-01623-x

Osha Roopnarine, David D. Thomas

{"title":"Structural Dynamics of Protein Interactions Using Site-Directed Spin Labeling of Cysteines to Measure Distances and Rotational Dynamics with EPR Spectroscopy","authors":"Osha Roopnarine, David D. Thomas","doi":"10.1007/s00723-023-01623-x","DOIUrl":"10.1007/s00723-023-01623-x","url":null,"abstract":"<div><p>Here we review applications of site-directed spin labeling (SDSL) with engineered cysteines in proteins, to study the structural dynamics of muscle and non-muscle proteins, using and developing the electron paramagnetic resonance (EPR) spectroscopic techniques of dipolar EPR, double electron electron resonance (DEER), saturation transfer EPR (STEPR), and orientation measured by EPR. The SDSL technology pioneered by Wayne Hubbell and collaborators has greatly expanded the use of EPR, including the measurement of distances between spin labels covalently attached to proteins and peptides. The Thomas lab and collaborators have applied these techniques to elucidate dynamic interactions in the myosin–actin complex, myosin-binding protein C, calmodulin, ryanodine receptor, phospholamban, utrophin, dystrophin, β-III-spectrin, and Aurora kinase. The ability to design and engineer cysteines in proteins for site-directed covalent labeling has enabled the use of these powerful EPR techniques to measure distances, while showing that they are complementary with optical spectroscopy measurements.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 1-3","pages":"79 - 100"},"PeriodicalIF":1.1,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-023-01623-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136097719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Practical Concepts for Design, Construction and Application of Halbach Magnets in Magnetic Resonance 哈尔巴赫磁体在磁共振中的设计、构造和应用的实用概念

IF 1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-10-10 DOI: 10.1007/s00723-023-01602-2

Peter Blümler, Helmut Soltner

引用次数: 0

Spin-Labeling Insights into How Chemical Fixation Impacts Glycan Organization on Cells 自旋标记法揭示化学固定如何影响细胞上的聚糖组织

IF 1.1 4区物理与天体物理

Applied Magnetic Resonance Pub Date : 2023-10-09 DOI: 10.1007/s00723-023-01624-w

Mohit Jaiswal, Trang T. Tran, Jiatong Guo, Mingwei Zhou, Sayan Kundu, Zhongwu Guo, Gail E. Fanucci

{"title":"Spin-Labeling Insights into How Chemical Fixation Impacts Glycan Organization on Cells","authors":"Mohit Jaiswal, Trang T. Tran, Jiatong Guo, Mingwei Zhou, Sayan Kundu, Zhongwu Guo, Gail E. Fanucci","doi":"10.1007/s00723-023-01624-w","DOIUrl":"10.1007/s00723-023-01624-w","url":null,"abstract":"<div><p>As new methods to interrogate glycan organization on cells develop, it is important to have molecular level understanding of how chemical fixation can impact results and interpretations. Site-directed spin labeling technologies are well suited to study how the spin label mobility is impacted by local environmental conditions, such as those imposed by cross-linking effects of paraformaldehyde cell fixation methods. Here, we utilize three different azide-containing sugars for metabolic glycan engineering with HeLa cells to incorporate azido glycans that are modified with a DBCO-based nitroxide moiety via click reaction. Continuous wave X-band electron paramagnetic resonance spectroscopy is employed to characterize how the chronological sequence of chemical fixation and spin labeling impacts the local mobility and accessibility of the nitroxide-labeled glycans in the glycocalyx of HeLa cells. Results demonstrate that chemical fixation with paraformaldehyde can alter local glycan mobility and care should be taken in the analysis of data in any study where chemical fixation and cellular labeling occur.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"55 1-3","pages":"317 - 333"},"PeriodicalIF":1.1,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0