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Pal T, Sahu K. Effect of salt addition on a triblock copolymer-zwitterionic surfactant assembly: insight from excited-state proton transfer. Phys Chem Chem Phys 2023; 25:29816-29830. [PMID: 37886857 DOI: 10.1039/d3cp03388k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Copolymer-surfactant assemblies are frequently utilized across various fields, from medicine to nanotechnology. Understanding the organization of the mixed assemblies in a saline environment will further expand their application horizons, especially under physiological conditions. Excited-state proton transfer (ESPT) can provide insight into the hydration nature and organization of the non-toxic assembly of a triblock copolymer F127 (poly-(ethylene oxide)101 (PEO101)-poly(propylene oxide)56 (PPO56)-PEO101)) and a zwitterionic sulfobetaine surfactant N-dodecyl-N,N-dimethyl-3-ammoniopropane sulfonate (SB12). Here, we present a comprehensive investigation of the compactness and hydration nature of the F127-SB12 mixed assemblies at different salt concentrations using the ESPT of 8-hydroxy pyrene-1,3,6-trisulfonate (HPTS). In the absence of salts, gradual SB12 addition to a premicellar (0.4 mM) or a post-micellar (4 mM) F127 solution leads to an anomalous modulation of the protonated and deprotonated emission bands. The emission intensity ratio (protonated/deprotonated) first increases to a maximum at a particular SB12 concentration (6 mM and 35 mM for the premicellar and post-micellar F127 assemblies, respectively), and then the ratio decreases with a further increase in the surfactant concentration. Since the intensity ratio is an indicator of the retardation of the ESPT process, the mixed micellar configuration displaying a maximum intensity ratio represents the most compact and least hydrated state. Salt addition to this configuration lowers the intensity ratio, signifying an enhanced ESPT process. Dynamic light scattering (DLS) results indicate that the size of the mixed assembly remains almost unaltered with the addition of salts. Thus, salinity enhances the ESPT process inside the F127-SB12 mixed assemblies without significantly altering the hydrodynamic radius.
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Affiliation(s)
- Tapas Pal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
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Sarkar S, Guha A, Sadhukhan R, Narayanan TN, Mondal J. Osmolytes as Cryoprotectants under Salt Stress. ACS Biomater Sci Eng 2023; 9:5639-5652. [PMID: 37697623 DOI: 10.1021/acsbiomaterials.3c00763] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
Cryoprotecting agent (CPA)-guided preservation is essential for effective protection of cells from cryoinjuries. However, current cryoprotecting technologies practiced to cryopreserve cells for biomedical applications are met with extreme challenges due to the associated toxicity of CPAs. Because of these limitations of present CPAs, the quest for nontoxic alternatives for useful application in cell-based biomedicines has been attracting growing interest. Toward this end, here, we investigate naturally occurring osmolytes' scope as biocompatible cryoprotectants under cold stress conditions in high-saline medium. Via a combination of the simulation and experiment on charged silica nanostructures, we render first-hand evidence that a pair of archetypal osmolytes, glycine and betaine, would act as a cryoprotectant by restoring the indigenous intersurface electrostatic interaction, which had been a priori screened due to the cold effect under salt stress. While these osmolytes' individual modes of action are sensitive to subtle chemical variation, a uniform augmentation in the extent of osmolytic activity is observed with an increase in temperature to counter the proportionately enhanced salt screening. The trend as noted in inorganic nanostructures is found to be recurrent and robustly transferable in a charged protein interface. In hindsight, our observation justifies the sufficiency of the reduced requirement of osmolytes in cells during critical cold conditions and encourages their direct usage and biomimicry for cryopreservation.
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Affiliation(s)
- Susmita Sarkar
- Center for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500046, India
| | - Anku Guha
- Center for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500046, India
| | - Rayantan Sadhukhan
- Center for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500046, India
| | - Tharangattu N Narayanan
- Center for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500046, India
| | - Jagannath Mondal
- Center for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad 500046, India
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Sarkar S, Guha A, Narayanan TN, Mondal J. Zwitterionic Osmolytes Revive Surface Charges under Salt Stress via Dual Mechanisms. J Phys Chem Lett 2022; 13:5660-5668. [PMID: 35709362 DOI: 10.1021/acs.jpclett.2c00853] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To counter the stress of a salt imbalance, the cell often produces low molecular weight osmolytes to resuscitate homeostasis. However, how zwitterionic osmolytes would tune the electrostatic interactions among charged biomacromolecular surfaces under salt stress has eluded mainstream investigations. Here, via combination of molecular simulation and experiment, we demonstrate that a set of zwitterionic osmolytes is able to restore the electrostatic interaction between two negatively charged surfaces that had been masked in the presence of salt. Interestingly, the mechanisms of resurrecting charge interaction under excess salt are revealed to be mutually divergent and osmolyte specific. In particular, glycine is found to competitively desorb the salt ions from the surface via its direct interaction with the surface. On the contrary, TMAO and betaine counteract salt stress by retaining adsorbed cations but partially neutralizing their charge density via ion-mediated interaction. These access to alternative modes of osmolytic actions would provide the cell the required flexibility in combating salt stress.
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Affiliation(s)
- Susmita Sarkar
- Tata Institute of Fundamental Research, Hyderabad500046, India
| | - Anku Guha
- Tata Institute of Fundamental Research, Hyderabad500046, India
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Hishida M, Anjum R, Anada T, Murakami D, Tanaka M. Effect of Osmolytes on Water Mobility Correlates with Their Stabilizing Effect on Proteins. J Phys Chem B 2022; 126:2466-2475. [DOI: 10.1021/acs.jpcb.1c10634] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mafumi Hishida
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Rubaiya Anjum
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takahisa Anada
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Daiki Murakami
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masaru Tanaka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Li J, Chen J, An L, Yuan X, Yao L. Polyol and sugar osmolytes can shorten protein hydrogen bonds to modulate function. Commun Biol 2020; 3:528. [PMID: 32968183 PMCID: PMC7511342 DOI: 10.1038/s42003-020-01260-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 08/28/2020] [Indexed: 12/19/2022] Open
Abstract
Polyol and sugar osmolytes are commonly used in therapeutic protein formulations. How they may affect protein structure and function is an important question. In this work, through NMR measurements, we show that glycerol and sorbitol (polyols), as well as glucose (sugar), can shorten protein backbone hydrogen bonds. The hydrogen bond shortening is also captured by molecular dynamics simulations, which suggest a hydrogen bond competition mechanism. Specifically, osmolytes weaken hydrogen bonds between the protein and solvent to strengthen those within the protein. Although the hydrogen bond change is small, with the average experimental cross hydrogen bond 3hJNC' coupling of two proteins GB3 and TTHA increased by ~ 0.01 Hz by the three osmolytes (160 g/L), its effect on protein function should not be overlooked. This is exemplified by the PDZ3-peptide binding where several intermolecular hydrogen bonds are formed and osmolytes shift the equilibrium towards the bound state.
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Affiliation(s)
- Jingwen Li
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
| | - Jingfei Chen
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
| | - Liaoyuan An
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoxiang Yuan
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lishan Yao
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
- Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
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Cai K, Liu J, Liu Y, Chen F, Yan G, Lin H. Application of a transparent window vibrational probe (azido probe) to the structural dynamics of model dipeptides and amyloid β-peptide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 227:117681. [PMID: 31685425 DOI: 10.1016/j.saa.2019.117681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 10/02/2019] [Accepted: 10/18/2019] [Indexed: 06/10/2023]
Abstract
The azido asymmetric stretching motion is widely used for the elucidation of the intrinsic conformational preference and folding mechanism of protein since it has strong vibrational absorbance in the spectral transparent windows. However, the possible secondary structural disturbance induced by the insertion of azido group in the side chain of polypeptides should be carefully evaluated. Here, DFT calculation and enhanced sampling method were employed for model dipeptides with or without azido substitution, and the outcome results show that the lower potential energy basins of isolated model dipeptides are consistent with the preferred structural distributions of model dipeptides in aqueous solution. The azido asymmetric stretching frequency shows its sensitivity to the backbone configurations just like amide-I vibration does, and the azido vibration exhibits great potential as a structural reporter in the transparent window. For the evaluation of the application of azido group in biologically related system, the structural dynamics of Aβ37-42 and N3-Aβ37-42 fragments and the self-assemble process of their protofiliments in aqueous solution were demonstrated. The outcome results show that the structural fluctuations of Aβ37-42 and its protofilament in aqueous solution are quite similar with or without azido substitution, and the dewetting transitions of Aβ37-42 and N3-Aβ37-42 β-sheet layers are both complete within 30 ns and assemble into stable protofilaments. Therefore, the azido asymmetric vibrational motion is a minimally invasive structural probe and would not introduce much disturbance to the structural dynamics of polypeptides.
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Affiliation(s)
- Kaicong Cai
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007, Fujian, PR China; Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen, 361005, Fujian, PR China.
| | - Jia Liu
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007, Fujian, PR China; Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen, 361005, Fujian, PR China
| | - Ya'nan Liu
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007, Fujian, PR China; Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen, 361005, Fujian, PR China
| | - Feng Chen
- Fujian Province University Key Laboratory of Green Energy and Environment Catalysis, Ningde Normal University, Ningde, 352100, PR China
| | - Guiyang Yan
- Fujian Province University Key Laboratory of Green Energy and Environment Catalysis, Ningde Normal University, Ningde, 352100, PR China
| | - Huiqiu Lin
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, 350007, Fujian, PR China
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Nandy A, Chakraborty S, Nandi S, Bhattacharyya K, Mukherjee S. Structure, Activity, and Dynamics of Human Serum Albumin in a Crowded Pluronic F127 Hydrogel. J Phys Chem B 2019; 123:3397-3408. [DOI: 10.1021/acs.jpcb.9b00219] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Atanu Nandy
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Subhajit Chakraborty
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Somen Nandi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Kankan Bhattacharyya
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
| | - Saptarshi Mukherjee
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal 462066, Madhya Pradesh, India
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Verma PK, Kundu A, Cho M. How Molecular Crowding Differs from Macromolecular Crowding: A Femtosecond Mid-Infrared Pump-Probe Study. J Phys Chem Lett 2018; 9:6584-6592. [PMID: 30380875 DOI: 10.1021/acs.jpclett.8b03153] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Crowding is an inherent property of living systems in which biochemical processes occur in highly concentrated solutions of various finite-sized species of both low (molecular crowding) and high (macromolecular crowding) molecular weights. Is molecular crowding fundamentally different from macromolecular crowding? To answer this question, we use a femtosecond mid-infrared pump-probe technique with three vibrational probes in molecular (diethylene glycol) and macromolecular (polyethylene glycol) solutions. In less crowded media, both molecular and macromolecular crowders fail to affect the dynamics of interstitial bulk-like water molecules and those at the crowder/water interface. In highly crowded media, interstitial water dynamics strongly depends on molecular crowding, but macromolecular crowding does not alter the bulk-like hydration dynamics and has a modest crowding effect on water at the crowder/water interface. The results of this study provide a molecular level understanding of the structural and dynamic changes to water and the water-mediated cross-linking of crowders.
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Affiliation(s)
- Pramod Kumar Verma
- Center for Molecular Spectroscopy and Dynamics , Institute for Basic Science (IBS) , Seoul 02841 , Republic of Korea
- Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea
- Department of Chemistry, Institute of Science , Banaras Hindu University , Varanasi 221005 , India
| | - Achintya Kundu
- Center for Molecular Spectroscopy and Dynamics , Institute for Basic Science (IBS) , Seoul 02841 , Republic of Korea
- Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea
| | - Minhaeng Cho
- Center for Molecular Spectroscopy and Dynamics , Institute for Basic Science (IBS) , Seoul 02841 , Republic of Korea
- Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea
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Xie WJ, Cha S, Ohto T, Mizukami W, Mao Y, Wagner M, Bonn M, Hunger J, Nagata Y. Large Hydrogen-Bond Mismatch between TMAO and Urea Promotes Their Hydrophobic Association. Chem 2018. [DOI: 10.1016/j.chempr.2018.08.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Abstract
Up to 40% of intracellular water is confined due to the dense packing of macromolecules, ions, and osmolytes. Despite the large body of work concerning the effect of additives on the biomolecular structure and stability, the role of crowding and heterogeneity in these interactions is not well understood. Here, infrared spectroscopy and molecular dynamics simulations are used to describe the mechanisms by which crowding modulates hydrogen bonding interactions between water and dimethyl sulfoxide (DMSO). Specifically, we use formamide and dimethylformamide (DMF) as molecular crowders and show that the S═O hydrogen bond populations in aqueous mixtures are increased by both amides. These additives increase the amount of water within the DMSO first solvation shell through two mechanisms: (a) directly stabilizing water-DMSO hydrogen bonds; (b) increasing water exposure by destabilizing DMSO-DMSO self-interactions. Further, we quantified the hydrogen bond enthalpies between the different components: DMSO-water (61 kJ/mol) > DMSO-formamide (32 kJ/mol) > water-water (23 kJ/mol) ≫ formamide-water (4.7 kJ/mol). Spectra of carbonyl stretching vibrations show that DMSO induces the dehydration of amides as a result of strong DMSO-water interactions, which has been suggested as the main mechanism of protein destabilization.
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Affiliation(s)
- Kwang-Im Oh
- Department of Chemistry , University of Texas at Austin , 105 E 24th St. Stop A5300 , Austin , TX 78712 , United States
| | - Carlos R Baiz
- Department of Chemistry , University of Texas at Austin , 105 E 24th St. Stop A5300 , Austin , TX 78712 , United States
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