1
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Arasakumar N, Loganathan V, Natesh R, Ponnuraj K. HrpY protein of Ralstonia solanacearum exhibits spontaneous formation of pilus like assembly: analysis of its stability. J Biomol Struct Dyn 2024:1-12. [PMID: 38230438 DOI: 10.1080/07391102.2024.2304678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 01/04/2024] [Indexed: 01/18/2024]
Abstract
Type 3 secretory system (T3SS), a complex protein machinery has a unique virulence mechanism that involves injecting effector proteins directly into host cells. The T3SS effector proteins are transported through an extracellular long hollow needle made up of multiple copies of a small protein. In T3SS of the plant pathogen Ralstonia solanacearum, the 8.6 kDa HrpY protein assembles into a large needle like apparatus (pilus) for transporting effector proteins. To study structural details of HrpY, we recombinantly expressed and purified HrpY in E. coli. The dynamic light scattering (DLS) analysis showed that rHrpY has spontaneously formed oligomers of large order (>100 nm). Transmission electron microscopy of rHrpY samples revealed that the large structures are tube like assembly having dimensions 86.3-166.6 nm and 5.8-6.8 nm in length and width respectively. Different molecular sizes of the purified rHrpY hindered the crystallization of the protein. The stability of oligomer assembly was studied with denaturants and surfactants. Denaturants like urea and guanidine HCl could not break them apart; however, detergents like SDS, sarkosyl, Octyl-β-Glucoside, CHAPS, Tween 20, Tween 80 and Triton X-100 showed disassembly of the oligomer. rHrpY assembly was found to withstand up to 50 °C and the circular dichroism analysis revealed that there is no significant change in the secondary structural composition with increase in temperature. However, change in the secondary structure was observed with the addition of SDS.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Naveen Arasakumar
- Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India
| | - Vikraam Loganathan
- Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India
| | - Ramanathan Natesh
- Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Trivandrum, India
| | - Karthe Ponnuraj
- Centre of Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India
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2
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Jung YJ, Choi JS, Ryu JY, Zhang Z, Lim YB. Cooperative Assembly of Self-Adjusting α-Helical Coiled Coils along the Length of an mRNA Chain to Form a Thermodynamically Stable Nanotube Carrier. J Am Chem Soc 2023; 145:23048-23056. [PMID: 37735109 DOI: 10.1021/jacs.3c05638] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
Although mRNA delivery technology is very promising, problems in safety and transport arise due to the intrinsically low thermodynamic stability of the current mRNA carriers. Considering that mRNAs are filamentous and a nanotube is one of the most thermodynamically stable shapes among nanoassemblies, a nanotube is one of the most stable supramolecular structures that can be assembled with mRNA. Here, we develop a nanotube-shaped filamentous mRNA delivery platform that shows exceptionally high thermodynamic stability. The key to the development of the mRNA nanotube is the design of self-adjusting supramolecular building blocks (SABs) that have two disparate properties, i.e., dynamic property and stiffness, in a single molecule. The counterbalance of the dynamic property and stiffness in SABs enables the coating of mRNA by winding its way through the flexible and irregular mRNA chain via cooperative interactions. SAB nanotubes with targeting ligands installed show a high uptake efficiency in mammalian cells and controllable gene expression behavior. Thus, the mRNA nanotube provides an enabling technology toward the development of safe and stable mRNA vaccines and therapeutics.
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Affiliation(s)
- You-Jin Jung
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Jun Shik Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Jung-Yeon Ryu
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Zhihao Zhang
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Yong-Beom Lim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
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3
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Nirmalraj PN, Rossell MD, Dachraoui W, Thompson D, Mayer M. In Situ Observation of Chemically Induced Protein Denaturation at Solvated Interfaces. ACS APPLIED MATERIALS & INTERFACES 2023; 15:48015-48026. [PMID: 37797325 PMCID: PMC10591235 DOI: 10.1021/acsami.3c10510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 09/22/2023] [Indexed: 10/07/2023]
Abstract
Proteins unfold in chaotropic salt solutions, a process that is difficult to observe at the single protein level. The work presented here demonstrates that a liquid-based atomic force microscope and graphene liquid-cell-based scanning transmission electron microscope make it possible to observe chemically induced protein unfolding. To illustrate this capability, ferritin proteins were deposited on a graphene surface, and the concentration-dependent urea- or guanidinium-induced changes of morphology were monitored for holo-ferritin with its ferrihydrite core as well as apo-ferritin without this core. Depending on the chaotropic agent the liquid-based imaging setup captured an unexpected transformation of natively folded holo-ferritin proteins into rings after urea treatment but not after guanidinium treatment. Urea treatment of apo-ferritin did not result in nanorings, confirming that nanorings are a specific signature of denaturation of holo-ferritins after exposture to sufficiently high urea concentrations. Mapping the in situ images with molecular dynamics simulations of ferritin subunits in urea solutions suggests that electrostatic destabilization triggers denaturation of ferritin as urea makes direct contact with the protein and also disrupts the water H-bonding network in the ferritin solvation shell. Our findings deepen the understanding of protein denaturation studied using label-free techniques operating at the solid-liquid interface.
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Affiliation(s)
- Peter Niraj Nirmalraj
- Transport
at Nanoscale Interfaces Laboratory, Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
| | - Marta D. Rossell
- Electron
Microscopy Center, Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Walid Dachraoui
- Electron
Microscopy Center, Swiss Federal Laboratories
for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Damien Thompson
- Department
of Physics, Bernal Institute, University
of Limerick, Limerick V94T9PX, Ireland
| | - Michael Mayer
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700 Fribourg, Switzerland
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4
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Priyadarshi A, Devi HM, Swaminathan R. Disruption of Spatial Proximities among Charged Groups in Equilibrium-Denatured States of Proteins Tracked Using Protein Charge Transfer Spectra. Biochemistry 2023. [PMID: 37162303 DOI: 10.1021/acs.biochem.3c00006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The absorption and luminescence originating from protein charge transfer spectra (ProCharTS) depend on the proximity between multiple charged groups in a protein. This makes ProCharTS absorbance/luminescence intensity a sensitive probe for detecting changes in the protein structure, which alter the proximity among charged groups in the protein. In this work, ProCharTS absorbance of charge-rich proteins like human serum albumin (HSA), α3C, and α3W was used to monitor structural changes upon chemical denaturant-induced protein unfolding under equilibrium conditions. The denaturation midpoints were estimated using nonlinear regression analysis. For HSA, absorbance at 325 and 340 nm estimated the GdnHCl-induced denaturation midpoints to be 0.80 and 0.61 M, respectively. A similar analysis of α3C and α3W ProCharTS absorbance yielded denaturation midpoints of 0.88 and 0.86 M at 325 nm and 0.96 and 0.66 M at 340 nm, respectively. A previously reported molten globule-like state in the GdnHCl-induced HSA unfolding pathway was detected by the increase in HSA ProCharTS absorbance at 0.5 M GdnHCl. To validate the above results, protein unfolding was additionally monitored using conventional methods like circular dichroism (CD), Trp, and dansyl fluorescence. Our results suggest that disruption of charged amino acid sidechain contacts as revealed by ProCharTS occurs at lower denaturant concentrations compared to the loss of secondary/folded structure monitored by CD and fluorescence. Further, HSA ProCharTS absorbance at 315-340 nm revealed that tertiary contacts among charged residues were disrupted at lower GdnHCl concentrations compared to sequence adjacent contacts. Our data underscore the utility of ProCharTS as a novel label-free tool to track unfolding in charge-rich proteins.
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Affiliation(s)
- Anurag Priyadarshi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Himanshi Maniram Devi
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Rajaram Swaminathan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
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5
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A Structure-Based Mechanism for the Denaturing Action of Urea, Guanidinium Ion and Thiocyanate Ion. BIOLOGY 2022; 11:biology11121764. [PMID: 36552273 PMCID: PMC9775367 DOI: 10.3390/biology11121764] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022]
Abstract
An exhaustive analysis of all the protein structures deposited in the Protein Data Bank, here performed, has allowed the identification of hundredths of protein-bound urea molecules and the structural characterization of such binding sites. It emerged that, even though urea molecules are largely involved in hydrogen bonds with both backbone and side chains, they are also able to make van der Waals contacts with nonpolar moieties. As similar findings have also been previously reported for guanidinium and thiocyanate, this observation suggests that promiscuity is a general property of protein denaturants. Present data provide strong support for a mechanism based on the protein-denaturant direct interactions with a denaturant binding model to equal and independent sites. In this general framework, our investigations also highlight some interesting insights into the different denaturing power of urea compared to guanidinium/thiocyanate.
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6
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Hoppe J, Byzia E, Szymańska M, Drozd R, Smiglak M. Acceleration of lactose hydrolysis using beta-galactosidase and deep eutectic solvents. Food Chem 2022; 384:132498. [DOI: 10.1016/j.foodchem.2022.132498] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 12/21/2021] [Accepted: 02/15/2022] [Indexed: 12/25/2022]
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7
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Analysis of the Factors Affecting Static In Vitro Pepsinolysis of Food Proteins. Molecules 2022; 27:molecules27041260. [PMID: 35209049 PMCID: PMC8878058 DOI: 10.3390/molecules27041260] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/08/2022] [Accepted: 02/10/2022] [Indexed: 02/04/2023] Open
Abstract
In this meta-analysis, we collected 58 publications spanning the last seven decades that reported static in vitro protein gastric digestion results. A number of descriptors of the pepsinolysis process were extracted, including protein type; pepsin activity and concentration; protein concentration; pH; additives; protein form (e.g., ‘native’, ‘emulsion’, ‘gel’, etc.); molecular weight of the protein; treatment; temperature; and half-times (HT) of protein digestion. After careful analysis and the application of statistical techniques and regression models, several general conclusions could be extracted from the data. The protein form to digest the fastest was ‘emulsion’. The rate of pepsinolysis in the emulsion was largely independent of the protein type, whereas the gastric digestion of the native protein in the solution was strongly dependent on the protein type. The pepsinolysis was shown to be strongly dependent on the structural components of the proteins digested—specifically, β-sheet-inhibited and amino acid, leucine, methionine, and proline-promoted digestion. Interestingly, we found that additives included in the digestion mix to alter protein hydrolysis had, in general, a negligible effect in comparison to the clear importance of the protein form or additional treatment. Overall, the findings allowed for the targeted creation of foods for fast or slow protein digestion, depending on the nutritional needs.
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8
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Paul S, Paul S. Molecular insights into the urea-choline- O-sulfate interactions in aqueous solution. Phys Chem Chem Phys 2021; 23:25317-25334. [PMID: 34747954 DOI: 10.1039/d1cp02821a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Urea and choline-O-sulfate (COS) are both osmolytes, but have opposite effects on protein structure. Urea has been well-known for years to destabilize protein structure. Though COS has been revealed as an osmoprotective molecule against urea induced denaturation of proteins, the mechanism of this compensation is still unexplored. This study focuses on a theoretical investigation of the interdependent behavior of urea and COS in a mixture, to explore how urea becomes a weaker denaturing agent in the presence of COS. In this study, we have considered every possible interaction among the solute (urea and COS) and solvent (water) both at room temperature and high temperature, employing two different force field parameters i.e., CHARMM General Force Field parameters (CGenFF) and General AMBER Force Field (GAFF) parameters through classical molecular dynamics simulation studies. Different techniques have been used to analyze the average interactions between COS and urea as well as their solvation properties, which show that in the presence of COS, urea becomes a less effective denaturant than when alone. The water-water interaction shows that the mixed osmolyte solution of urea and COS strengthens the water hydrogen bonding network. The enhanced solvation of urea and COS in the urea-COS mixture and their mutual interactions, results in the exclusion of free urea as well as COS from the solution. This synergistic behavior of urea and COS could be the major reason behind COS counteracting urea's denaturation of proteins.
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Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
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9
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Label-Free Quantitative Phosphoproteomics of the Fission Yeast Schizosaccharomyces pombe Using Strong Anion Exchange- and Porous Graphitic Carbon-Based Fractionation Strategies. Int J Mol Sci 2021; 22:ijms22041747. [PMID: 33572424 PMCID: PMC7916215 DOI: 10.3390/ijms22041747] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/03/2021] [Accepted: 02/05/2021] [Indexed: 12/26/2022] Open
Abstract
The phosphorylation of proteins modulates various functions of proteins and plays an important role in the regulation of cell signaling. In recent years, label-free quantitative (LFQ) phosphoproteomics has become a powerful tool to analyze the phosphorylation of proteins within complex samples. Despite the great progress, the studies of protein phosphorylation are still limited in throughput, robustness, and reproducibility, hampering analyses that involve multiple perturbations, such as those needed to follow the dynamics of phosphoproteomes. To address these challenges, we introduce here the LFQ phosphoproteomics workflow that is based on Fe-IMAC phosphopeptide enrichment followed by strong anion exchange (SAX) and porous graphitic carbon (PGC) fractionation strategies. We applied this workflow to analyze the whole-cell phosphoproteome of the fission yeast Schizosaccharomyces pombe. Using this strategy, we identified 8353 phosphosites from which 1274 were newly identified. This provides a significant addition to the S. pombe phosphoproteome. The results of our study highlight that combining of PGC and SAX fractionation strategies substantially increases the robustness and specificity of LFQ phosphoproteomics. Overall, the presented LFQ phosphoproteomics workflow opens the door for studies that would get better insight into the complexity of the protein kinase functions of the fission yeast S. pombe.
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10
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Hoppe J, Drozd R, Byzia E, Smiglak M. Deep eutectic solvents based on choline cation - Physicochemical properties and influence on enzymatic reaction with β-galactosidase. Int J Biol Macromol 2019; 136:296-304. [DOI: 10.1016/j.ijbiomac.2019.06.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 06/04/2019] [Accepted: 06/04/2019] [Indexed: 11/16/2022]
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11
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Amsdr A, Noudeh ND, Liu L, Chalikian TV. On urea and temperature dependences of m-values. J Chem Phys 2019; 150:215103. [DOI: 10.1063/1.5097936] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alah Amsdr
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Negar Dehghan Noudeh
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Lutan Liu
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Tigran V. Chalikian
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
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12
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Shen H, Song J, Zhou Z, Li M, Zhang R, Su P, Yang Y. DNA-Directed Immobilized Enzymes on Recoverable Magnetic Nanoparticles Shielded in Nucleotide Coordinated Polymers. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01341] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Hao Shen
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Jiayi Song
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Zixin Zhou
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Mengqi Li
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Ruiqi Zhang
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Ping Su
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Yi Yang
- Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, College of Science, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
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13
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Kohn EM, Lee JY, Calabro A, Vaden TD, Caputo GA. Heme Dissociation from Myoglobin in the Presence of the Zwitterionic Detergent N, N-Dimethyl- N-Dodecylglycine Betaine: Effects of Ionic Liquids. Biomolecules 2018; 8:biom8040126. [PMID: 30380655 PMCID: PMC6315634 DOI: 10.3390/biom8040126] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 10/23/2018] [Accepted: 10/24/2018] [Indexed: 01/24/2023] Open
Abstract
We have investigated myoglobin protein denaturation using the zwitterionic detergent Empigen BB (EBB, N,N-Dimethyl-N-dodecylglycine betaine). A combination of absorbance, fluorescence, and circular dichroism spectroscopic measurements elucidated the protein denaturation and heme dissociation from myoglobin. The results indicated that Empigen BB was not able to fully denature the myoglobin structure, but apparently can induce the dissociation of the heme group from the protein. This provides a way to estimate the heme binding free energy, ΔGdissociation. As ionic liquids (ILs) have been shown to perturb the myoglobin protein, we have investigated the effects of the ILs 1-butyl-3-methylimidazolium chloride (BMICl), 1-ethyl-3-methylimidazolium acetate (EMIAc), and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4) in aqueous solution on the ΔGdissociation values. Absorbance experiments show the ILs had minimal effect on ΔGdissociation values when compared to controls. Fluorescence and circular dichroism data confirm the ILs have no effect on heme dissociation, demonstrating that low concentrations ILs do not impact the heme dissociation from the protein and do not significantly denature myoglobin on their own or in combination with EBB. These results provide important data for future studies of the mechanism of IL-mediated protein stabilization/destabilization and biocompatibility studies.
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Affiliation(s)
- Eric M Kohn
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA.
- Bantivoglio Honors College, Rowan University, Glassboro, NJ 08028, USA.
| | - Joshua Y Lee
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA.
- Bantivoglio Honors College, Rowan University, Glassboro, NJ 08028, USA.
| | - Anthony Calabro
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA.
| | - Timothy D Vaden
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA.
| | - Gregory A Caputo
- Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA.
- Department of Molecular & Cellular Biosciences, Rowan University, Glassboro, NJ 08028, USA.
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14
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Paul S, Paul S. How Does Aqueous Choline-O-Sulfate Solution Nullify the Action of Urea in Protein Denaturation? J Chem Inf Model 2018; 58:1858-1869. [DOI: 10.1021/acs.jcim.8b00395] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Srijita Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India−781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India−781039
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15
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Singh MI, Jain V. Identification and Characterization of an Inside-Out Folding Intermediate of T4 Phage Sliding Clamp. Biophys J 2017; 113:1738-1749. [PMID: 29045868 DOI: 10.1016/j.bpj.2017.08.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/15/2017] [Accepted: 08/28/2017] [Indexed: 10/18/2022] Open
Abstract
Protein folding process involves formation of transiently occurring intermediates that are difficult to isolate and characterize. It is both necessary and interesting to characterize the structural conformations adopted by these intermediates, also called molten globules (MG), to understand protein folding. Here, we investigated the equilibrium (un)folding intermediate state of T4 phage gene product 45 (gp45, also known as DNA polymerase processivity factor or sliding clamp) obtained during chemical denaturation. We show that gp45 undergoes substantial conformational rearrangement during unfolding and forms an expanded dry-MG. By monitoring the fluorescence of tryptophans that were strategically introduced at various sites, we demonstrate that the urea-treated molecule has its surface residues flip inside the core, and closely placed residues move farther. We were also able to isolate and purify the MG form of gp45 in native condition (i.e., nondenaturing buffer, at physiological pH and temperature); characteristics of this purified molecule substantially match with urea-treated wild-type gp45. To the best of our knowledge, this is one of the few reports that demonstrate the isolation and purification of a protein folding intermediate in native condition. We believe that our work not only allows us to dissect the process of protein folding, but will also help in the designing of folding inhibitors against sliding clamps to treat a wide variety of diseases from bacterial infection to cancer, due to the vast presence of clamps in all the domains of life.
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Affiliation(s)
- Manika Indrajit Singh
- Microbiology and Molecular Biology Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Bhopal, Madhya Pradesh, India
| | - Vikas Jain
- Microbiology and Molecular Biology Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Bhopal, Madhya Pradesh, India.
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16
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Time-dependent X-ray diffraction studies on urea/hen egg white lysozyme complexes reveal structural changes that indicate onset of denaturation. Sci Rep 2016; 6:32277. [PMID: 27573790 PMCID: PMC5004150 DOI: 10.1038/srep32277] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 08/05/2016] [Indexed: 01/10/2023] Open
Abstract
Temporal binding of urea to lysozyme was examined using X-ray diffraction of single crystals of urea/lysozyme complexes prepared by soaking native lysozyme crystals in solutions containing 9 M urea. Four different soak times of 2, 4, 7 and 10 hours were used. The five crystal structures (including the native lysozyme), refined to 1.6 Å resolution, reveal that as the soaking time increased, more and more first-shell water molecules are replaced by urea. The number of hydrogen bonds between urea and the protein is similar to that between protein and water molecules replaced by urea. However, the number of van der Waals contacts to protein from urea is almost double that between the protein and the replaced water. The hydrogen bonding and van der Waals interactions are initially greater with the backbone and later with side chains of charged residues. Urea altered the water-water hydrogen bond network both by replacing water solvating hydrophobic residues and by shortening the first-shell intra-water hydrogen bonds by 0.2 Å. These interaction data suggest that urea uses both 'direct' and 'indirect' mechanisms to unfold lysozyme. Specific structural changes constitute the first steps in lysozyme unfolding by urea.
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17
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Correro MR, Moridi N, Schützinger H, Sykora S, Ammann EM, Peters EH, Dudal Y, Corvini PFX, Shahgaldian P. Enzyme Shielding in an Enzyme-thin and Soft Organosilica Layer. Angew Chem Int Ed Engl 2016; 55:6285-9. [DOI: 10.1002/anie.201600590] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Indexed: 12/13/2022]
Affiliation(s)
- M. Rita Correro
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Negar Moridi
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Hansjörg Schützinger
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
- INOFEA AG; Hochbergerstrasse 60C 4057 Basel Switzerland
| | - Sabine Sykora
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Erik M. Ammann
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - E. Henrik Peters
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Yves Dudal
- INOFEA AG; Hochbergerstrasse 60C 4057 Basel Switzerland
| | - Philippe F.-X. Corvini
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
- School of the Environment; Nanjing University; 210093 Nanjing China
| | - Patrick Shahgaldian
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
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18
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Correro MR, Moridi N, Schützinger H, Sykora S, Ammann EM, Peters EH, Dudal Y, Corvini PFX, Shahgaldian P. Enzyme Shielding in an Enzyme-thin and Soft Organosilica Layer. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600590] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- M. Rita Correro
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Negar Moridi
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Hansjörg Schützinger
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
- INOFEA AG; Hochbergerstrasse 60C 4057 Basel Switzerland
| | - Sabine Sykora
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Erik M. Ammann
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - E. Henrik Peters
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
| | - Yves Dudal
- INOFEA AG; Hochbergerstrasse 60C 4057 Basel Switzerland
| | - Philippe F.-X. Corvini
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
- School of the Environment; Nanjing University; 210093 Nanjing China
| | - Patrick Shahgaldian
- School of Life Science; University of Applied Sciences and Arts Northwestern Switzerland; Gründenstrasse 40 4132 Muttenz Switzerland
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19
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Kim H, Kim S, Jung Y, Han J, Yun JH, Chang I, Lee W. Probing the Folding-Unfolding Transition of a Thermophilic Protein, MTH1880. PLoS One 2016; 11:e0145853. [PMID: 26766214 PMCID: PMC4713090 DOI: 10.1371/journal.pone.0145853] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 12/09/2015] [Indexed: 11/18/2022] Open
Abstract
The folding mechanism of typical proteins has been studied widely, while our understanding of the origin of the high stability of thermophilic proteins is still elusive. Of particular interest is how an atypical thermophilic protein with a novel fold maintains its structure and stability under extreme conditions. Folding-unfolding transitions of MTH1880, a thermophilic protein from Methanobacterium thermoautotrophicum, induced by heat, urea, and GdnHCl, were investigated using spectroscopic techniques including circular dichorism, fluorescence, NMR combined with molecular dynamics (MD) simulations. Our results suggest that MTH1880 undergoes a two-state N to D transition and it is extremely stable against temperature and denaturants. The reversibility of refolding was confirmed by spectroscopic methods and size exclusion chromatography. We found that the hyper-stability of the thermophilic MTH1880 protein originates from an extensive network of both electrostatic and hydrophobic interactions coordinated by the central β-sheet. Spectroscopic measurements, in combination with computational simulations, have helped to clarify the thermodynamic and structural basis for hyper-stability of the novel thermophilic protein MTH1880.
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Affiliation(s)
- Heeyoun Kim
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, 120–740, Korea
| | - Sangyeol Kim
- Department of Physics, Pusan National University, Busan, 609–735, Korea
- Center for Proteome Biophysics, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 711–873, Korea
| | - Youngjin Jung
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, 120–740, Korea
| | - Jeongmin Han
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, 120–740, Korea
| | - Ji-Hye Yun
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, 120–740, Korea
| | - Iksoo Chang
- Center for Proteome Biophysics, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 711–873, Korea
- Department of Brain and Cognitive Sciences, DGIST, Daegu, 711–873, Korea
| | - Weontae Lee
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, 120–740, Korea
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20
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Newcomer RL, Fraser LCR, Teschke CM, Alexandrescu AT. Mechanism of Protein Denaturation: Partial Unfolding of the P22 Coat Protein I-Domain by Urea Binding. Biophys J 2015; 109:2666-2677. [PMID: 26682823 PMCID: PMC4699920 DOI: 10.1016/j.bpj.2015.11.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 10/13/2015] [Accepted: 11/06/2015] [Indexed: 01/30/2023] Open
Abstract
The I-domain is an insertion domain of the bacteriophage P22 coat protein that drives rapid folding and accounts for over half of the stability of the full-length protein. We sought to determine the role of hydrogen bonds (H-bonds) in the unfolding of the I-domain by examining (3)JNC' couplings transmitted through H-bonds, the temperature and urea-concentration dependence of (1)HN and (15)N chemical shifts, and native-state hydrogen exchange at urea concentrations where the domain is predominantly folded. The native-state hydrogen-exchange data suggest that the six-stranded β-barrel core of the I-domain is more stable against unfolding than a smaller subdomain comprised of a short α-helix and three-stranded β-sheet. H-bonds, separately determined from solvent protection and (3)JNC' H-bond couplings, are identified with an accuracy of 90% by (1)HN temperature coefficients. The accuracy is improved to 95% when (15)N temperature coefficients are also included. In contrast, the urea dependence of (1)HN and (15)N chemical shifts is unrelated to H-bonding. The protein segments with the largest chemical-shift changes in the presence of urea show curved or sigmoidal titration curves suggestive of direct urea binding. Nuclear Overhauser effects to urea for these segments are also consistent with specific urea-binding sites in the I-domain. Taken together, the results support a mechanism of urea unfolding in which denaturant binds to distinct sites in the I-domain. Disordered segments bind urea more readily than regions in stable secondary structure. The locations of the putative urea-binding sites correlate with the lower stability of the structure against solvent exchange, suggesting that partial unfolding of the structure is related to urea accessibility.
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Affiliation(s)
- Rebecca L Newcomer
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut
| | - LaTasha C R Fraser
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut
| | - Carolyn M Teschke
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut; Department of Chemistry, University of Connecticut, Storrs, Connecticut.
| | - Andrei T Alexandrescu
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut.
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21
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Cong Y, Zhang Z, Zhang S, Hu L, Gu J. Quantitative MS analysis of therapeutic mAbs and their glycosylation for pharmacokinetics study. Proteomics Clin Appl 2015; 10:303-14. [DOI: 10.1002/prca.201500098] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 10/24/2015] [Accepted: 11/03/2015] [Indexed: 02/04/2023]
Affiliation(s)
- Yuting Cong
- Research Center for Drug Metabolism; School of Life Sciences; Jilin University; Changchun China
- CAS Key Laboratory of Separation Sciences for Analytical Chemistry; National Chromatographic R&A Center; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian China
| | - Zhang Zhang
- CAS Key Laboratory of Separation Sciences for Analytical Chemistry; National Chromatographic R&A Center; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian China
| | - Shen Zhang
- CAS Key Laboratory of Separation Sciences for Analytical Chemistry; National Chromatographic R&A Center; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian China
| | - Lianghai Hu
- Research Center for Drug Metabolism; School of Life Sciences; Jilin University; Changchun China
| | - Jingkai Gu
- Research Center for Drug Metabolism; School of Life Sciences; Jilin University; Changchun China
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22
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Paul S, Paul S. Exploring the Counteracting Mechanism of Trehalose on Urea Conferred Protein Denaturation: A Molecular Dynamics Simulation Study. J Phys Chem B 2015; 119:9820-34. [DOI: 10.1021/acs.jpcb.5b01576] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Subrata Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India-781039
| | - Sandip Paul
- Department of Chemistry, Indian Institute of Technology, Guwahati, Assam, India-781039
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23
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Reddy PM, Taha M, Sharma YVRK, Venkatesu P, Lee MJ. Quantifying the co-solvent effects on trypsin from the digestive system of carp Catla catla by biophysical techniques and molecular dynamics simulations. RSC Adv 2015. [DOI: 10.1039/c5ra01302j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Urea molecules locate within 0.5 nm of the surface of trypsin.
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Affiliation(s)
- P. Madhusudhana Reddy
- Department of Chemistry
- University of Delhi
- Delhi – 110 007
- India
- Department of Chemical Engineering
| | - M. Taha
- CICECO
- Departamento de Química
- Universidade de Aveiro
- 3810-193 Aveiro
- Portugal
| | | | | | - Ming-Jer Lee
- Department of Chemical Engineering
- National Taiwan University of Science & Technology
- Taipei 10607
- Taiwan
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24
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Aghanouri A, Shoemaker CF, Sun G. Characterization of Conformational Structures of Plant Proteins in Solutions. Ind Eng Chem Res 2014. [DOI: 10.1021/ie5032502] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Abolfazl Aghanouri
- Division of Textiles and Clothing, ‡Department of Food Science and Technology, University of California, Davis, California 95616, United States
| | - Charles F. Shoemaker
- Division of Textiles and Clothing, ‡Department of Food Science and Technology, University of California, Davis, California 95616, United States
| | - Gang Sun
- Division of Textiles and Clothing, ‡Department of Food Science and Technology, University of California, Davis, California 95616, United States
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25
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Son I, Shek YL, Tikhomirova A, Baltasar EH, Chalikian TV. Interactions of Urea with Native and Unfolded Proteins: A Volumetric Study. J Phys Chem B 2014; 118:13554-63. [DOI: 10.1021/jp509356k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ikbae Son
- Department
of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Yuen Lai Shek
- Department
of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Anna Tikhomirova
- Department
of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
| | - Eduardo Hidalgo Baltasar
- Department
of Physical Chemistry, Faculty of Chemistry, University Complutense of Madrid, 28040 Madrid, Spain
| | - Tigran V. Chalikian
- Department
of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, Ontario M5S 3M2, Canada
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26
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Le P, Zhao J, Franzen S. Correlation of Heme Binding Affinity and Enzyme Kinetics of Dehaloperoxidase. Biochemistry 2014; 53:6863-77. [DOI: 10.1021/bi5005975] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter Le
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Jing Zhao
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Stefan Franzen
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States
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27
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Bandyopadhyay D, Mohan S, Ghosh SK, Choudhury N. Molecular Dynamics Simulation of Aqueous Urea Solution: Is Urea a Structure Breaker? J Phys Chem B 2014; 118:11757-68. [DOI: 10.1021/jp505147u] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dibyendu Bandyopadhyay
- Heavy water Division and ‡Theoretical Chemistry
Section, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sadhana Mohan
- Heavy water Division and ‡Theoretical Chemistry
Section, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Swapan K. Ghosh
- Heavy water Division and ‡Theoretical Chemistry
Section, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Niharendu Choudhury
- Heavy water Division and ‡Theoretical Chemistry
Section, Bhabha Atomic Research Centre, Mumbai 400 085, India
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28
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On the influence of the mixture of denaturants on protein structure stability: A molecular dynamics study. Chem Phys 2014. [DOI: 10.1016/j.chemphys.2014.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Jha SK, Marqusee S. Kinetic evidence for a two-stage mechanism of protein denaturation by guanidinium chloride. Proc Natl Acad Sci U S A 2014; 111:4856-61. [PMID: 24639503 PMCID: PMC3977270 DOI: 10.1073/pnas.1315453111] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Dry molten globular (DMG) intermediates, an expanded form of the native protein with a dry core, have been observed during denaturant-induced unfolding of many proteins. These observations are counterintuitive because traditional models of chemical denaturation rely on changes in solvent-accessible surface area, and there is no notable change in solvent-accessible surface area during the formation of the DMG. Here we show, using multisite fluorescence resonance energy transfer, far-UV CD, and kinetic thiol-labeling experiments, that the guanidinium chloride (GdmCl)-induced unfolding of RNase H also begins with the formation of the DMG. Population of the DMG occurs within the 5-ms dead time of our measurements. We observe that the size and/or population of the DMG is linearly dependent on [GdmCl], although not as strongly as the second and major step of unfolding, which is accompanied by core solvation and global unfolding. This rapid GdmCl-dependent population of the DMG indicates that GdmCl can interact with the protein before disrupting the hydrophobic core. These results imply that the effect of chemical denaturants cannot be interpreted solely as a disruption of the hydrophobic effect and strongly support recent computational studies, which hypothesize that chemical denaturants first interact directly with the protein surface before completely unfolding the protein in the second step (direct interaction mechanism).
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Affiliation(s)
| | - Susan Marqusee
- California Institute for Quantitative Biosciences and
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3220
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30
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Sen P, Khan MM, Equbal A, Ahmad E, Khan RH. At very low concentrations known chaotropes act as kosmotropes for the N and B isoforms of human serum albumin. Biochem Cell Biol 2013; 91:72-8. [DOI: 10.1139/bcb-2012-0035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Very few studies have been done to understand the effect of millimolar concentrations of chaotropes on protein structure. In our previous study we observed that the secondary and tertiary structure of human serum albumin (HSA) increases in the presence of 5 mmol/L urea. Micelle formation in amphoteric detergents increases in the presence of equivalent concentrations of urea. Here, we observed a significant increase in the secondary and tertiary structure of HSA. Interestingly, guanidine hydrochloride, another chaotropic agent, also shows a similar effect. Our results show electrostatic interaction may play a role in neutral to basic transition in HSA. This study further supports the claim that at millimolar concentrations the chaotropes may act as kosmotropes for proteins.
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Affiliation(s)
- Priyankar Sen
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
- P.G. Department of Biotechnology, Utkal University, Bhubaneswar 751004, India
| | - Mohd Moin Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Asif Equbal
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Ejaz Ahmad
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
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31
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McDonald CB, Bhat V, Kurouski D, Mikles DC, Deegan BJ, Seldeen KL, Lednev IK, Farooq A. Structural landscape of the proline-rich domain of Sos1 nucleotide exchange factor. Biophys Chem 2013; 175-176:54-62. [PMID: 23528987 DOI: 10.1016/j.bpc.2013.02.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 02/08/2013] [Accepted: 02/25/2013] [Indexed: 10/27/2022]
Abstract
Despite its key role in mediating a plethora of cellular signaling cascades pertinent to health and disease, little is known about the structural landscape of the proline-rich (PR) domain of Sos1 guanine nucleotide exchange factor. Herein, using a battery of biophysical tools, we provide evidence that the PR domain of Sos1 is structurally disordered and adopts an extended random coil-like conformation in solution. Of particular interest is the observation that while chemical denaturation of PR domain results in the formation of a significant amount of polyproline II (PPII) helices, it has little or negligible effect on its overall size as measured by its hydrodynamic radius. Our data also show that the PR domain displays a highly dynamic conformational basin in agreement with the knowledge that the intrinsically unstructured proteins rapidly interconvert between an ensemble of conformations. Collectively, our study provides new insights into the conformational equilibrium of a key signaling molecule with important consequences on its physiological function.
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Affiliation(s)
- Caleb B McDonald
- Department of Biochemistry & Molecular Biology, Leonard Miller School of Medicine, University of Miami, Miami, FL 33136, USA
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32
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Almarza J, Rincón L, Bahsas A, Pinto MA, Brito F. Urea's effect on the ribonuclease A catalytic efficiency: a kinetic, 1H NMR and molecular orbital study. Protein J 2013; 32:118-25. [PMID: 23381689 DOI: 10.1007/s10930-013-9468-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Understanding of protein-urea interactions is one of the greatest challenges to modern structural protein chemistry. Based in enzyme kinetics experiments and (1)H NMR spectroscopic analysis we proposed that urea, at low concentrations, directly interacts with the protonated histidines of the active center of RNase A, following a simple model of competitive inhibition. These results were supported by theoretical analysis based on the frontier molecular orbital theory and suggest that urea might establish a favorable interaction with the cationic amino acids. Our experimental evidence and theoretical analysis indicate that the initials steps of the molecular mechanism of Urea-RNase A interaction passes through the establishment of a three center four electron adduct. Also, our results would explain the observed disruption of the (1)H NMR signals corresponding to H12 and H119 (involved in catalysis) of the RNase A studied in the presence of urea. Our interaction model of urea-amino acids (cationic) can be extended to explain the inactivation of other enzymes with cationic amino acids at the active site.
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Affiliation(s)
- Jorge Almarza
- Laboratorio de Genética y Química Celular, Departamento de Biología, Facultad de Ciencias, Universidad de Los Andes, Mérida, Venezuela
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33
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Zano S, Wijayasinghe YS, Malik R, Smith J, Viola RE. Relationship between enzyme properties and disease progression in Canavan disease. J Inherit Metab Dis 2013; 36:1-6. [PMID: 22850825 DOI: 10.1007/s10545-012-9520-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 06/19/2012] [Accepted: 07/09/2012] [Indexed: 11/24/2022]
Abstract
Canavan disease (CD) is a fatal neurological disorder caused by defects in the gene that encodes for a critical metabolic enzyme. The enzyme aspartoacylase catalyzes the deacetylation of N-acetylaspartate to produce acetate required for fatty acid biosynthesis in the brain. The loss of aspartoacylase activity leads to the demyelination and disrupted brain development that is found in CD patients. Sixteen different clinical mutants of aspartoacylase have been cloned, expressed and purified to examine their properties and the relationship between enzyme properties and disease phenotype. In contrast to numerous cell culture studies that reported virtually complete loss of function, each of these purified mutant enzymes was found to have measureable catalytic activity. However, the activities of these mutants are diminished, by as little as three-fold to greater than 100-fold when compared to the native enzyme. Many of these mutated enzyme forms show decreased thermal stability and an increased propensity for denaturation upon exposure to urea, but only four of the 16 mutants examined showed both diminished thermal and diminished conformational stability. Significantly, each of these lower stability mutants are responsible for the more severe phenotypes of CD, while patients with milder forms of CD have aspartoacylase mutants with generally high catalytic activity and with either good thermal or good conformational stability. These results suggest that the loss of catalytic function and the accumulation of N-acetylaspartate in Canavan disease is at least partially a consequence of the decreased protein stability caused by these mutations.
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Affiliation(s)
- Stephen Zano
- Department of Chemistry, University of Toledo, Toledo, OH 43606, USA
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34
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Huang JR, Gabel F, Jensen MR, Grzesiek S, Blackledge M. Sequence-specific mapping of the interaction between urea and unfolded ubiquitin from ensemble analysis of NMR and small angle scattering data. J Am Chem Soc 2012; 134:4429-36. [PMID: 22309138 DOI: 10.1021/ja2118688] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The molecular details of how urea interacts with, and eventually denatures proteins, remain largely unknown. In this study we have used extensive experimental NMR data, in combination with statistical coil ensemble modeling and small-angle scattering, to analyze the conformational behavior of the protein ubiquitin in the presence of urea. In order to develop an atomic resolution understanding of the denatured state, conformational ensembles of full-atom descriptions of unfolded proteins, including side chain conformations derived from rotamer libraries, are combined with random sampling of explicit urea molecules in interaction with the protein. Using this description of the conformational equilibrium, we demonstrate that the direct-binding model of urea to the protein backbone is compatible with available experimental data. We find that, in the presence of 8 M urea, between 30 and 40% of the backbone peptide groups bind a urea molecule, independently reproducing results from a model-free analysis of small-angle neutron and X-ray scattering data. Crucially, this analysis also provides sequence specific details of the interaction between urea and the protein backbone. The pattern of urea-binding along the amino-acid sequence reveals a higher level of binding in the central part of the protein, a trend which resembles independent results derived from chemical shift mapping of the urea-protein interaction. Together these results substantiate the direct-binding model and provide a framework for studying the physical basis of interactions between proteins and solvent molecules.
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Affiliation(s)
- Jie-rong Huang
- CEA, Institut de Biologie Structurale Jean-Pierre Ebel, 41 Rue Jules Horowitz, Grenoble 38027, France
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35
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Zhang W, Cai HC, Li FF, Xi YB, Ma X, Yan YB. The congenital cataract-linked G61C mutation destabilizes γD-crystallin and promotes non-native aggregation. PLoS One 2011; 6:e20564. [PMID: 21655238 PMCID: PMC3105094 DOI: 10.1371/journal.pone.0020564] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 05/03/2011] [Indexed: 11/18/2022] Open
Abstract
γD-crystallin is one of the major structural proteins in human eye lens. The solubility and stability of γD-crystallin play a crucial role in maintaining the optical properties of the lens during the life span of an individual. Previous study has shown that the inherited mutation G61C results in autosomal dominant congenital cataract. In this research, we studied the effects of the G61C mutation on γD-crystallin structure, stability and aggregation via biophysical methods. CD, intrinsic and extrinsic fluorescence spectroscopy indicated that the G61C mutation did not affect the native structure of γD-crystallin. The stability of γD-crystallin against heat- or GdnHCl-induced denaturation was significantly decreased by the mutation, while no influence was observed on the acid-induced unfolding. The mutation mainly affected the transition from the native state to the intermediate but not that from the intermediate to the unfolded or aggregated states. At high temperatures, both proteins were able to form aggregates, and the aggregation of the mutant was much more serious than the wild type protein at the same temperature. At body temperature and acidic conditions, the mutant was more prone to form amyloid-like fibrils. The aggregation-prone property of the mutant was not altered by the addition of reductive reagent. These results suggested that the decrease in protein stability followed by aggregation-prone property might be the major cause in the hereditary cataract induced by the G61C mutation.
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Affiliation(s)
- Wang Zhang
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Hong-Chen Cai
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Fei-Feng Li
- Department of Genetics, National Research Institute for Family Planning, Beijing, China
- Peking Union Medical College, Tsinghua University, Beijing, China
| | - Yi-Bo Xi
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
- Institute of Biophysics, Lanzhou University, Lanzhou, China
| | - Xu Ma
- Department of Genetics, National Research Institute for Family Planning, Beijing, China
- Peking Union Medical College, Tsinghua University, Beijing, China
- * E-mail: (XM); (YBY)
| | - Yong-Bin Yan
- State Key Laboratory of Biomembrane and Membrane Biotechnology, School of Life Sciences, Tsinghua University, Beijing, China
- * E-mail: (XM); (YBY)
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James NG, Ross JA, Stefl M, Jameson DM. Applications of phasor plots to in vitro protein studies. Anal Biochem 2010; 410:70-6. [PMID: 21078289 DOI: 10.1016/j.ab.2010.11.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 11/05/2010] [Accepted: 11/07/2010] [Indexed: 10/18/2022]
Abstract
In a recent article, we described the application of phasor analysis to fluorescence intensity decay data on in vitro samples. As detailed in that article, this method provides researchers with a simple graphical method for viewing lifetime data that can be used to quantify individual components of a mixture as well as to identify excited state reactions. In the current article, we extend the use of in vitro phasor analysis to intrinsic protein fluorescence. We show how alterations in the excited state properties of tryptophan residues are easily visualized using the phasor method. Specifically, we demonstrate that protein-ligand and protein-protein interactions can result in unique shifts in the location of phasor points, indicative of protein conformational changes. Application of the method to a rapid kinetic experiment is also shown. Finally, we show that the unfolding of lysozyme with either urea or guanidine hydrochloride results in different phasor trajectories, indicative of unique denaturation pathways.
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Affiliation(s)
- Nicholas G James
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96813, USA
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Proc JL, Kuzyk MA, Hardie DB, Yang J, Smith DS, Jackson AM, Parker CE, Borchers CH. A quantitative study of the effects of chaotropic agents, surfactants, and solvents on the digestion efficiency of human plasma proteins by trypsin. J Proteome Res 2010; 9:5422-37. [PMID: 20722421 DOI: 10.1021/pr100656u] [Citation(s) in RCA: 265] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Plasma biomarkers studies are based on the differential expression of proteins between different treatment groups or between diseased and control populations. Most mass spectrometry-based methods of protein quantitation, however, are based on the detection and quantitation of peptides, not intact proteins. For peptide-based protein quantitation to be accurate, the digestion protocols used in proteomic analyses must be both efficient and reproducible. There have been very few studies, however, where plasma denaturation/digestion protocols have been compared using absolute quantitation methods. In this paper, 14 combinations of heat, solvent [acetonitrile, methanol, trifluoroethanol], chaotropic agents [guanidine hydrochloride, urea], and surfactants [sodium dodecyl sulfate (SDS) and sodium deoxycholate (DOC)] were compared with respect to their effectiveness in improving subsequent tryptic digestion. These digestion protocols were evaluated by quantitating the production of proteotypic tryptic peptides from 45 moderate- to high-abundance plasma proteins, using tandem mass spectrometry in multiple reaction monitoring mode, with a mixture of stable-isotope labeled analogues of these proteotypic peptides as internal standards. When the digestion efficiencies of these 14 methods were compared, we found that both of the surfactants (SDS and DOC) produced an increase in the overall yield of tryptic peptides from these 45 proteins, when compared to the more commonly used urea protocol. SDS, however, can be a serious interference for subsequent mass spectrometry. DOC, on the other hand, can be easily removed from the samples by acid precipitation. Examining the results of a reproducibility study, done with 5 replicate digestions, DOC and SDS with a 9 h digestion time produced the highest average digestion efficiencies (∼80%), with the highest average reproducibility (<5% error, defined as the relative deviation from the mean value). However, because of potential interferences resulting from the use of SDS, we recommend DOC with a 9 h digestion procedure as the optimum protocol.
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Affiliation(s)
- Jennifer L Proc
- University of Victoria-Genome BC Proteomics Centre, Victoria, BC, Canada
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38
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Wu M, Chen Y, Wu R, Li R, Zou H, Chen B, Yao S. The synthesis of chloropropyl-functionalized silica hybrid monolithic column with modification of N,N-dimethyl-N-dodecylamine for capillary electrochromatography separation. J Chromatogr A 2010; 1217:4389-94. [DOI: 10.1016/j.chroma.2010.03.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Revised: 03/06/2010] [Accepted: 03/12/2010] [Indexed: 10/19/2022]
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Development of a rapid, high-efficiency, scalable refold for neurotrophin-4. Biotechnol Appl Biochem 2010; 56:27-34. [PMID: 20408815 DOI: 10.1042/ba20090306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A scalable refold for human neurotrophin-4 was developed as part of a manufacturing process required for the production of supplies for preclinical and clinical studies. The process redox system, chaotrope, solubilization additives, pH, temperature and protein concentration were optimized. The limited availability of suitable material for experimentation during concurrent downstream process development led to the approach described in the present paper: a combination of OFAT (one factor at a time) and multivariate DOE (design of experiments) to identify appropriate conditions. The optimized refold conditions included the use of sulfonated protein, raw materials utilized in other process operations and an inexpensive redox system. The conditions were found to be robust and were demonstrated from the millilitre scale to the 300 litre pilot scale. A process control procedure that utilized an RPC (reversed-phase chromatography) quantitative assay to monitor the percentage conversion into oxidized protein was developed. Refold conversions of 80-90% were obtained under ambient temperature and atmospheric conditions, with reaction times of approx. 18 h.
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40
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Lee S, Shek YL, Chalikian TV. Urea interactions with protein groups: A volumetric study. Biopolymers 2010; 93:866-79. [DOI: 10.1002/bip.21478] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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41
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Manning MC, Chou DK, Murphy BM, Payne RW, Katayama DS. Stability of protein pharmaceuticals: an update. Pharm Res 2010; 27:544-75. [PMID: 20143256 DOI: 10.1007/s11095-009-0045-6] [Citation(s) in RCA: 753] [Impact Index Per Article: 53.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 12/27/2009] [Indexed: 12/16/2022]
Abstract
In 1989, Manning, Patel, and Borchardt wrote a review of protein stability (Manning et al., Pharm. Res. 6:903-918, 1989), which has been widely referenced ever since. At the time, recombinant protein therapy was still in its infancy. This review summarizes the advances that have been made since then regarding protein stabilization and formulation. In addition to a discussion of the current understanding of chemical and physical instability, sections are included on stabilization in aqueous solution and the dried state, the use of chemical modification and mutagenesis to improve stability, and the interrelationship between chemical and physical instability.
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Attri P, Venkatesu P, Lee MJ. Influence of Osmolytes and Denaturants on the Structure and Enzyme Activity of α-Chymotrypsin. J Phys Chem B 2010; 114:1471-8. [DOI: 10.1021/jp9092332] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pankaj Attri
- Department of Chemistry, University of Delhi, Delhi - 110 007, India, and Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Pannuru Venkatesu
- Department of Chemistry, University of Delhi, Delhi - 110 007, India, and Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
| | - Ming-Jer Lee
- Department of Chemistry, University of Delhi, Delhi - 110 007, India, and Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei 106-07, Taiwan
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