1
|
Allert MJ, Kumar S, Wang Y, Beese LS, Hellinga HW. Chromophore carbonyl twisting in fluorescent biosensors encodes direct readout of protein conformations with multicolor switching. Commun Chem 2023; 6:168. [PMID: 37598249 PMCID: PMC10439942 DOI: 10.1038/s42004-023-00982-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 08/11/2023] [Indexed: 08/21/2023] Open
Abstract
Fluorescent labeling of proteins is a powerful tool for probing structure-function relationships with many biosensing applications. Structure-based rules for systematically designing fluorescent biosensors require understanding ligand-mediated fluorescent response mechanisms which can be challenging to establish. We installed thiol-reactive derivatives of the naphthalene-based fluorophore Prodan into bacterial periplasmic glucose-binding proteins. Glucose binding elicited paired color exchanges in the excited and ground states of these conjugates. X-ray structures and mutagenesis studies established that glucose-mediated color switching arises from steric interactions that couple protein conformational changes to twisting of the Prodan carbonyl relative to its naphthalene plane. Mutations of residues contacting the carbonyl can optimize color switching by altering fluorophore conformational equilibria in the apo and glucose-bound proteins. A commonly accepted view is that Prodan derivatives report on protein conformations via solvatochromic effects due to changes in the dielectric of their local environment. Here we show that instead Prodan carbonyl twisting controls color switching. These insights enable structure-based biosensor design by coupling ligand-mediated protein conformational changes to internal chromophore twists through specific steric interactions between fluorophore and protein.
Collapse
Affiliation(s)
- Malin J Allert
- Department of Biochemistry, Duke University Medical Center, Durham, NC, 27710, USA
| | - Shivesh Kumar
- Department of Biochemistry, Duke University Medical Center, Durham, NC, 27710, USA
- Department of Biochemistry and Molecular Biophysics, Washington University in St. Louis, St. Louis, MO, 63110, USA
| | - You Wang
- Department of Biochemistry, Duke University Medical Center, Durham, NC, 27710, USA
| | - Lorena S Beese
- Department of Biochemistry, Duke University Medical Center, Durham, NC, 27710, USA
| | - Homme W Hellinga
- Department of Biochemistry, Duke University Medical Center, Durham, NC, 27710, USA.
| |
Collapse
|
2
|
Tao Y, Yan B, Zhang N, Wang M, Zhao J, Zhang H, Chen W, Fan D. Dielectric determination of glucose solutions under microwave fields via a novel molecular dynamics simulation approach. J FOOD ENG 2022; 316:110844. [DOI: 10.1016/j.jfoodeng.2021.110844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
3
|
Kubbutat P, Kulozik U, Dombrowski J. Influence of interfacial characteristics and dielectric properties on foam structure preservation during microwave-assisted vacuum drying of whey protein isolate-maltodextrin dispersions. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2021.110691] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
4
|
Tao Y, Yan B, Zhang N, Wang M, Zhao J, Zhang H, Chen W, Fan D. Microwave vacuum evaporation as a potential technology to concentrate sugar solutions: A study based on dielectric spectroscopy. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2020.110414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
5
|
|
6
|
Franco AP, Tadini CC, Wilhelms Gut JA. Predicting the dielectric behavior of orange and other citrus fruit juices at 915 and 2450 MHz. International Journal of Food Properties 2017. [DOI: 10.1080/10942912.2017.1347674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Arlet Patrícia Franco
- Department of Chemical Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP, Brazil
- Escuela de Ingenierías y Arquitectura, Universidad Pontificia Bolivariana, Montería, Córdoba, Colombia
| | - Carmen Cecilia Tadini
- Department of Chemical Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP, Brazil
- Food Research Center (FoRC), University of São Paulo, São Paulo, SP, Brazil
| | - Jorge Andrey Wilhelms Gut
- Department of Chemical Engineering, Escola Politécnica, University of São Paulo, São Paulo, SP, Brazil
- Food Research Center (FoRC), University of São Paulo, São Paulo, SP, Brazil
| |
Collapse
|
7
|
El Khaled D, Castellano NN, Gázquez JA, Perea-Moreno AJ, Manzano-Agugliaro F. Dielectric Spectroscopy in Biomaterials: Agrophysics. Materials (Basel) 2016; 9:E310. [PMID: 28773438 DOI: 10.3390/ma9050310] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 04/18/2016] [Accepted: 04/20/2016] [Indexed: 11/17/2022]
Abstract
Being dependent on temperature and frequency, dielectric properties are related to various types of food. Predicting multiple physical characteristics of agri-food products has been the main objective of non-destructive assessment possibilities executed in many studies on horticultural products and food materials. This review manipulates the basic fundamentals of dielectric properties with their concepts and principles. The different factors affecting the behavior of dielectric properties have been dissected, and applications executed on different products seeking the characterization of a diversity of chemical and physical properties are all pointed out and referenced with their conclusions. Throughout the review, a detailed description of the various adopted measurement techniques and the mostly popular equipment are presented. This compiled review serves in coming out with an updated reference for the dielectric properties of spectroscopy that are applied in the agrophysics field.
Collapse
|
8
|
Jha SN, Narsaiah K, Basediya AL, Sharma R, Jaiswal P, Kumar R, Bhardwaj R. Measurement techniques and application of electrical properties for nondestructive quality evaluation of foods-a review. J Food Sci Technol 2011; 48:387-411. [PMID: 23572764 PMCID: PMC3551172 DOI: 10.1007/s13197-011-0263-x] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 04/18/2010] [Accepted: 05/05/2010] [Indexed: 11/28/2022]
Abstract
Non-destructive systems are recent trends for quality evaluation of fruits and vegetables. Information on post-harvest variations in electrical properties is needed to develop new instruments for this purpose. Electrical properties are finding increasing application in agriculture and food processing industries. Knowledge of dielectric properties of foods as a function of moisture content and temperature is essential in the design and control of drying systems. As simple, rapid and non-destructive measuring techniques, dielectric spectroscopy provides information about the dielectric response of materials to electromagnetic field. Electrical properties of agricultural materials have been of interest for many years. The interest in dielectric properties of materials has historically been associated with the design of electrical equipment. This review paper covers theoretical aspects of different electrical properties, their measurement techniques, applications of dielectric properties in agriculture/food processing sector and potential applications of thermal imaging (TI) for quality and safety assessment in food processing. The values of dielectric properties of a number of products including food grains, fruits and vegetables, and meat and meat products are presented in table form. This comprehensive coverage will be useful for academic, scientific and industrial community in treating and applying the facts in developing/testing new processes and products based on electromagnetic energy application.
Collapse
Affiliation(s)
- Shyam Narayan Jha
- />Division of Agricultural Structure and Environment Control, Central Institute of Post Harvest Engineering & Technology (CIPHET), CIPHET, Ludhiana, 141004 Punjab India
| | - K. Narsaiah
- />Division of Agricultural Structure and Environment Control, Central Institute of Post Harvest Engineering & Technology (CIPHET), CIPHET, Ludhiana, 141004 Punjab India
| | - A. L. Basediya
- />Division of Agricultural Engineering, Indian Agricultural Research Institute (IARI), IARI, Pusa, 110012 New Delhi India
| | - Rajiv Sharma
- />Division of Agricultural Structure and Environment Control, Central Institute of Post Harvest Engineering & Technology (CIPHET), CIPHET, Ludhiana, 141004 Punjab India
| | - Pranita Jaiswal
- />Division of Agricultural Structure and Environment Control, Central Institute of Post Harvest Engineering & Technology (CIPHET), CIPHET, Ludhiana, 141004 Punjab India
| | - Ramesh Kumar
- />Division of Horticultural Crop Processing, Central Institute of Post Harvest Engineering & Technology (CIPHET), CIPHET, Abohar, 152116 Punjab India
| | - Rishi Bhardwaj
- />Division of Agricultural Structure and Environment Control, Central Institute of Post Harvest Engineering & Technology (CIPHET), CIPHET, Ludhiana, 141004 Punjab India
| |
Collapse
|
9
|
Al-muhtaseb AH, Hararah MA, Megahey E, Mcminn W, Magee T. Dielectric properties of microwave-baked cake and its constituents over a frequency range of 0.915–2.450GHz. J FOOD ENG 2010; 98:84-92. [DOI: 10.1016/j.jfoodeng.2009.12.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
10
|
Nemes SM, Orsat V. Screening the Experimental Domain for the Microwave-Assisted Extraction of Secoisolariciresinol Diglucoside from Flaxseed Prior to Optimization Procedures. FOOD BIOPROCESS TECH 2010; 3:300-7. [DOI: 10.1007/s11947-009-0212-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|