1
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Wakako S, Hori Y, Kinoshita T, Saiki T, Qi X, Hasegawa K, Imai Y, Mori T, Nakagawa K, Fukuhara G. Pressure-Responsive Polymer Chemosensors for Hydrostatic-Pressure-Signal Detection: Poly-l-Lysine-Pyrene Conjugates. ACS Macro Lett 2023; 12:1389-1395. [PMID: 37782005 DOI: 10.1021/acsmacrolett.3c00427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Stimulus-responsive polymer materials are an attractive alternative to conventional supramolecular and polymer assemblies for applications in sensing, imaging, and drug-delivery systems. Herein, we synthesized a series of pyrene-labeled α- and ε-poly-l-lysine conjugates with varying degrees of substitution (DSs). Hydrostatic-pressure-UV/vis, fluorescence, and excitation spectroscopies and fluorescence lifetime measurements revealed ground-state conformers and excited-state ensembles emitting fluorescence with variable intensities. The polylysine-based chemosensors demonstrated diverse ratiometric responses to hydrostatic pressure through adjustments in polar solvents, DSs, and polymer backbones. Additionally, the fluorescence chemosensor exhibited a promising glum value of 3.2 × 10-3, indicating potential applications in chiral fluorescent materials. This study offers valuable insights into the development of smart hydrostatic-pressure-responsive polymer materials.
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Affiliation(s)
- Soshi Wakako
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Yumiko Hori
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Tomokazu Kinoshita
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Takao Saiki
- Department of Precision Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Xinyi Qi
- Department of Bioengineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Koki Hasegawa
- Graduate School of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yoshitane Imai
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Tadashi Mori
- Department of Applied Chemistry, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
| | - Keiichi Nakagawa
- Department of Precision Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Department of Bioengineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Gaku Fukuhara
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
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2
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Berger JE, Teixeira SCM, Reed K, Razinkov VI, Sloey CJ, Qi W, Roberts CJ. High-Pressure, Low-Temperature Induced Unfolding and Aggregation of Monoclonal Antibodies: Role of the Fc and Fab Fragments. J Phys Chem B 2022; 126:4431-4441. [PMID: 35675067 DOI: 10.1021/acs.jpcb.1c10528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effects of high pressure and low temperature on the stability of two different monoclonal antibodies (MAbs) were examined in this work. Fluorescence and small-angle neutron scattering were used to monitor the in situ effects of pressure to infer shifts in tertiary structure and characterize aggregation prone intermediates. Partial unfolding was observed for both MAbs, to different extents, under a range of pressure/temperature conditions. Fourier transform infrared spectroscopy was also used to monitor ex situ changes in secondary structure. Preservation of native secondary structure after incubation at elevated pressures and subzero ° C temperatures was independent of the extent of tertiary unfolding and reversibility. Several combinations of pressure and temperature were also used to discern the respective contributions of the isolated Ab fragments (Fab and Fc) to unfolding and aggregation. The fragments for each antibody showed significantly different partial unfolding profiles and reversibility. There was not a simple correlation between stability of the full MAb and either the Fc or Fab fragment stabilities across all cases, demonstrating a complex relationship to full MAb unfolding and aggregation behavior. That notwithstanding, the combined use of spectroscopic and scattering techniques provides insights into MAb conformational stability and hysteresis in high-pressure, low-temperature environments.
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Affiliation(s)
- Jordan E Berger
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Susana C M Teixeira
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States.,NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Kaelan Reed
- PharmBIO Products, W. L. Gore & Associates, Elkton, Maryland 21921, United States
| | - Vladimir I Razinkov
- Drug Product Technologies, Amgen, Thousand Oaks, California 91320, United States
| | - Christopher J Sloey
- Drug Product Technologies, Amgen, Thousand Oaks, California 91320, United States
| | - Wei Qi
- Drug Product Technologies, Amgen, Thousand Oaks, California 91320, United States
| | - Christopher J Roberts
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
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3
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Kinoshita T, Imai Y, Fukuhara G. Hydrostatic Pressure-Controllable Chiroptical Properties of Chiral Perylene Bisimide Dyes: A Chiral Aggregation Case. J Phys Chem B 2021; 125:5952-5958. [PMID: 34032446 DOI: 10.1021/acs.jpcb.1c02112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Hydrostatically pressurized spectroscopic and lifetime decay analyses of optically active perylene bisimides were demonstrated in the pressure range of 0.1-320 MPa to show a π-stacked aggregation. The hydrostatic pressure-induced excitation and circular dichroism spectral changes of the fluorescence perylene dye enabled us to differentiate the slight pressure-sensitive aggregates. This work will lead to a new strategy for creating a pressure-responsive supramolecular polymerization material.
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Affiliation(s)
- Tomokazu Kinoshita
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Yoshitane Imai
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Gaku Fukuhara
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.,JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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4
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Fukuchi M, Oyama K, Mizuno H, Miyagawa A, Koumoto K, Fukuhara G. Hydrostatic Pressure-Regulated Cellular Calcium Responses. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:820-826. [PMID: 33410684 DOI: 10.1021/acs.langmuir.0c03141] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Hydrostatic pressure control has attracted much attention and presents a still challenging objective from mechanobiological viewpoints. Herein, we reveal the calcium entry processes in HeLa cells by means of hydrostatic pressure spectroscopy. The steady-state fluorescence spectral data comprehensively elucidated the factors controlling the outcomes of the hydrostatic pressure-stimulated calcium entry behavior. The present work leads to a new perspective on ion regulations in living cells and an attractive alternative to conventional mechanostimuli.
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Affiliation(s)
- Minami Fukuchi
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kotaro Oyama
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanukimachi, Takasaki, Gunma 370-1292, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Hiroaki Mizuno
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Akihisa Miyagawa
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Kazuya Koumoto
- Department of Nanobiochemistry, FIRST (Frontiers of Innovative Research in Science and Technology), Konan University, 7-1-20 Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Gaku Fukuhara
- Department of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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5
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Tang CH. Nanocomplexation of proteins with curcumin: From interaction to nanoencapsulation (A review). Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2020.106106] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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6
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Miyagawa A, Yoneda H, Mizuno H, Numata M, Okada T, Fukuhara G. Hydrostatic‐Pressure‐Controlled Molecular Recognition: A Steroid Sensing Case Using Modified Cyclodextrin. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000204] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Akihisa Miyagawa
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8551 Japan
| | - Hiroshi Yoneda
- Department of Biomolecular Chemistry Graduate School of Life and Environmental Sciences Kyoto Prefectural University Shimogamo, Sakyo-ku, Kyoto 606-8522 Japan
| | - Hiroaki Mizuno
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8551 Japan
| | - Munenori Numata
- Department of Biomolecular Chemistry Graduate School of Life and Environmental Sciences Kyoto Prefectural University Shimogamo, Sakyo-ku, Kyoto 606-8522 Japan
| | - Tetsuo Okada
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8551 Japan
| | - Gaku Fukuhara
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8551 Japan
- JST, PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
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7
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Mizuno H, Kitamatsu M, Imai Y, Fukuhara G. Smart Fluorescence Materials that Are Controllable by Hydrostatic Pressure: Peptide−Pyrene Conjugates. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hiroaki Mizuno
- Department of ChemistryTokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551 Japan
| | - Mizuki Kitamatsu
- Department of Applied ChemistryFaculty of Science and EngineeringKindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Yoshitane Imai
- Department of Applied ChemistryFaculty of Science and EngineeringKindai University 3-4-1 Kowakae Higashi-Osaka Osaka 577-8502 Japan
| | - Gaku Fukuhara
- Department of ChemistryTokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8551 Japan
- JST, PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
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8
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ANS Interacts with the Ca 2+-ATPase Nucleotide Binding Site. J Fluoresc 2020; 30:483-496. [PMID: 32146650 DOI: 10.1007/s10895-020-02518-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 02/14/2020] [Indexed: 10/24/2022]
Abstract
The binding of 8-anilino-1-naphthalene sulfonate (ANS) to the nucleotide binding domain (N-domain) of the sarcoplasmic reticulum Ca2+-ATPase (SERCA) was studied. Molecular docking predicted two ANS binding modes (BMI and BMII) in the nucleotide binding site. The molecular interaction was confirmed as the fluorescence intensity of ANS was dramatically increased when in the presence of an engineered recombinant N-domain. Molecular dynamics simulation showed BMI (which occupies the ATP binding site) as the mode that is stable in solution. The above was confirmed by the absence of ANS fluorescence in the presence of a fluorescein isothiocyanate (FITC)-labeled N-domain. Further, the labeling of the N-domain with FITC was hindered by the presence of ANS, i.e., ANS was bound to the ATP binding site. Importantly, ANS displayed a higher affinity than ATP. In addition, ANS binding led to quenching the N-domain intrinsic fluorescence displaying a FRET pattern, which suggested the existence of a Trp-ANS FRET couple. Nonetheless, the chemical modification of the sole Trp residue with N-bromosuccinimide (NBS) discarded the existence of FRET and instead indicated structural rearrangements in the nucleotide binding site during ANS binding. Finally, Ca2+-ATPase kinetics in the presence of ANS showed a partial mixed-type inhibition. The Dixon plot showed the ANS-Ca2+-ATPase complex as catalytically active, hence supporting the existence of a functional dimeric Ca2+-ATPase in sarcoplasmic reticulum vesicles. ANS may be used as a molecular platform for the development of more effective inhibitors of Ca2+-ATPase and appears to be a new fluorescent probe for the nucleotide binding site. Graphical Abstract Molecular docking of ANS to the nucleotide binding site of Ca2+-ATPase. ANS fluorescence increase reveals molecular interaction.
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9
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Miyagawa A, Eng J, Okada T, Inoue Y, Penfold TJ, Fukuhara G. Hydrostatic Pressure-Induced Spectral Variation of Reichardt's Dye: A Polarity/Pressure Dual Indicator. ACS OMEGA 2020; 5:897-903. [PMID: 31956843 PMCID: PMC6964516 DOI: 10.1021/acsomega.9b03880] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 12/10/2019] [Indexed: 06/10/2023]
Abstract
The famous solvatochromic Reichardt's dye was applied to quantify hydrostatic pressure in media. The UV/vis spectra of the dye in various organic solvents are shifted bathochromically or hypsochromically at the shorter- or longer-wavelength band, respectively, upon hydrostatic pressurization. The E T value, determined by an absorption maximum, in ethyl acetate increases from 38.5 kcal mol-1 at 0.1 MPa to 39.2 kcal mol-1 at 300 MPa, which is mostly equal to the one in chloroform at 0.1 MPa. These spectroscopic origins were supported by the time-dependent density functional theory (TD-DFT) calculations. The concept and approach proposed in this paper, i.e., a dual indicator, should attract the attention of a broad spectrum in multidisciplinary science.
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Affiliation(s)
- Akihisa Miyagawa
- Department
of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Julien Eng
- Chemistry-
School of Natural and Environmental Sciences, Newcastle University, Newcastle
upon Tyne NE1 7RU, U.K.
| | - Tetsuo Okada
- Department
of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
| | - Yoshihisa Inoue
- Department
of Applied Chemistry, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
| | - Thomas James Penfold
- Chemistry-
School of Natural and Environmental Sciences, Newcastle University, Newcastle
upon Tyne NE1 7RU, U.K.
| | - Gaku Fukuhara
- Department
of Chemistry, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
- JST,
PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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10
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Takeda Y, Mizuno H, Okada Y, Okazaki M, Minakata S, Penfold T, Fukuhara G. Hydrostatic Pressure‐Controlled Ratiometric Luminescence Responses of a Dibenzo[
a,j
]phenazine‐Cored Mechanoluminophore. CHEMPHOTOCHEM 2019. [DOI: 10.1002/cptc.201900190] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Youhei Takeda
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1, Suita Osaka 565-0871 Japan
| | - Hiroaki Mizuno
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8511 Japan
| | - Yusuke Okada
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8511 Japan
| | - Masato Okazaki
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1, Suita Osaka 565-0871 Japan
| | - Satoshi Minakata
- Department of Applied Chemistry Graduate School of Engineering Osaka University Yamadaoka 2-1, Suita Osaka 565-0871 Japan
| | - Thomas Penfold
- Chemistry School of Natural and Environmental Sciences Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom
| | - Gaku Fukuhara
- Department of Chemistry Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8511 Japan
- JST, PRESTO 4-1-8 Honcho, Kawaguchi Saitama 332-0012 Japan
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11
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Structural stability of human butyrylcholinesterase under high hydrostatic pressure. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1867:107-113. [PMID: 30414450 DOI: 10.1016/j.bbapap.2018.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 11/02/2018] [Accepted: 11/05/2018] [Indexed: 11/23/2022]
Abstract
Human butyrylcholinesterase is a nonspecific enzyme of clinical, pharmacological and toxicological significance. Although the enzyme is relatively stable, its activity is affected by numerous factors, including pressure. In this work, hydrostatic pressure dependence of the intrinsic tryptophan fluorescence in native and salted human butyrylcholinesterase was studied up to the maximum pressure at ambient temperature of about 1200 MPa. A correlated large shift toward long wavelengths and broadening observed at pressures between 200 and 700 MPa was interpreted as due to high pressure-induced denaturation of the protein, leading to an enhanced exposure of tryptophan residues into polar solvent environment. This transient process in native butyrylcholinesterase presumably involves conformational changes of the enzyme at both tertiary and secondary structure levels. Pressure-induced mixing of emitting local indole electronic transitions with quenching charge transfer states likely describes the accompanying fluorescence quenching that reveals different course from spectral changes. All the pressure-induced changes turned irreversible after passing a mid-point pressure of about 400 ± 50 MPa. Addition of either 0.1 M ammonium sulphate (a kosmotropic salt) or 0.1 M lithium thiocyanate (a chaotropic salt) to native enzyme similarly destabilized its structure.
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12
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Sagara Y, Tamaoki N, Fukuhara G. Cyclophane-Based Fluorescence Tuning Induced by Hydrostatic Pressure Changes. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201800163] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yoshimitsu Sagara
- Research Institute for Electronic Science; Hokkaido University N20, W10, Kita-Ku, Sapporo; Hokkaido 001-0020 Japan
- JST-PRESTO Honcho 4-1-8, Kawaguchi; Saitama 332-0012 Japan
| | - Nobuyuki Tamaoki
- Research Institute for Electronic Science; Hokkaido University N20, W10, Kita-Ku, Sapporo; Hokkaido 001-0020 Japan
| | - Gaku Fukuhara
- JST-PRESTO Honcho 4-1-8, Kawaguchi; Saitama 332-0012 Japan
- Department of Chemistry; Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-Ku; Tokyo 152-8551 Japan
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Inhibitor and substrate binding induced stability of HIV-1 protease against sequential dissociation and unfolding revealed by high pressure spectroscopy and kinetics. PLoS One 2015; 10:e0119099. [PMID: 25781460 PMCID: PMC4362767 DOI: 10.1371/journal.pone.0119099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 01/28/2015] [Indexed: 01/10/2023] Open
Abstract
High-pressure methods have become an interesting tool of investigation of structural stability of proteins. They are used to study protein unfolding, but dissociation of oligomeric proteins can be addressed this way, too. HIV-1 protease, although an interesting object of biophysical experiments, has not been studied at high pressure yet. In this study HIV-1 protease is investigated by high pressure (up to 600 MPa) fluorescence spectroscopy of either the inherent tryptophan residues or external 8-anilino-1-naphtalenesulfonic acid at 25°C. A fast concentration-dependent structural transition is detected that corresponds to the dimer-monomer equilibrium. This transition is followed by a slow concentration independent transition that can be assigned to the monomer unfolding. In the presence of a tight-binding inhibitor none of these transitions are observed, which confirms the stabilizing effect of inhibitor. High-pressure enzyme kinetics (up to 350 MPa) also reveals the stabilizing effect of substrate. Unfolding of the protease can thus proceed only from the monomeric state after dimer dissociation and is unfavourable at atmospheric pressure. Dimer-destabilizing effect of high pressure is caused by negative volume change of dimer dissociation of -32.5 mL/mol. It helps us to determine the atmospheric pressure dimerization constant of 0.92 μM. High-pressure methods thus enable the investigation of structural phenomena that are difficult or impossible to measure at atmospheric pressure.
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14
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Benzaria A, Maresca M, Taieb N, Dumay E. Interaction of curcumin with phosphocasein micelles processed or not by dynamic high-pressure. Food Chem 2012; 138:2327-37. [PMID: 23497893 DOI: 10.1016/j.foodchem.2012.12.017] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 11/29/2012] [Accepted: 12/03/2012] [Indexed: 12/29/2022]
Abstract
The binding of curcumin to native-like phosphocaseins (PC) dispersed in simulated milk ultrafiltrate at pH 6.6 was assessed by fluorescence spectrophotometry. Curcumin binds to native-like PC micelles with ∼1 binding site per casein molecule, and a binding constant of 0.6-5.6 × 10(4)M(-1). Dynamic high pressure (or ultra-high pressure homogenisation, UHPH) at 200 MPa did not affect the binding parameters of curcumin to processed PC. UHPH-processing of PC dispersions at 300 MPa was followed by a slight but significant (p=0.05) increase in the binding constant of curcumin to processed PC, which may result from the significant UHPH-induced dissociation of initial PC micelles into neo-micelles of smaller sizes, and from the corresponding 1.5-2-fold increase in micelle surface area. PC-curcumin complexes were resistant to pepsin but were degraded by pancreatin, providing the possibility of a spatiotemporally controlled release and protection of bound biomolecules. UHPH-processed PC did not induce TC7-cell damage or major inflammation as assessed by LDH release or IL-8 secretion, respectively, compared with native-like PC. PC micelles could provide a valuable submicron system to vectorise drugs and nutrients.
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Affiliation(s)
- Amal Benzaria
- Université Montpellier 2, UMR 1208, Ingénierie des Agropolymères et Technologies Emergentes, Equipe de Biochimie et Technologie Alimentaires cc023, 2, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
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15
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René-Trouillefou M, Benzaria A, Marchal S, Lange R, Caporiccio B, Dumay E. Staphylococcal enterotoxin A: Partial unfolding caused by high pressure or denaturing agents enhances superantigenicity. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1804:1322-33. [DOI: 10.1016/j.bbapap.2010.01.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 01/17/2010] [Accepted: 01/21/2010] [Indexed: 10/19/2022]
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16
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Paz-Alfaro KJ, Ruiz-Granados YG, Uribe-Carvajal S, Sampedro JG. Trehalose-mediated thermal stabilization of glucose oxidase from Aspergillus niger. J Biotechnol 2009; 141:130-6. [PMID: 19433216 DOI: 10.1016/j.jbiotec.2009.03.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Revised: 03/11/2009] [Accepted: 03/16/2009] [Indexed: 01/08/2023]
Abstract
Thermal inactivation and enzyme kinetics of glucose oxidase (a FAD dependent enzyme) were studied in the absence and presence of trehalose. The inactivation rate constant decreased by up to 50% at temperatures between 50 and 70 degrees C in the presence of 0.6M trehalose; as a consequence the glucose oxidase half-life increased. Intrinsic fluorescence spectra showed a maximum center of spectral mass (CSM) red shift of 6.5nm. Therefore, major structural changes seem to be related to glucose oxidase thermal inactivation. Trehalose decreased the rate constant for unfolding as monitored by CSM red shift kinetics indicating that this disaccharide favors the most compact folded state. The E(a) for unfolding was increased from 204 to 221kJ mol(-1). It is proposed that FAD dissociation is preceded by the exposition of hydrophobic regions, while the presence of trehalose was able to hinder the release of FAD. Enzyme kinetics analysis showed that trehalose does not affect V(max) but instead decreases K(m); as a result enzyme efficiency was increased. The stabilizing effect of trehalose in a cofactor-dependent enzyme has not been tested to date. In addition, glucose oxidase has an enormous commercial importance and therefore, the use of trehalose to stabilize glucose oxidase in its multiple applications seems to be promising.
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Affiliation(s)
- Karina J Paz-Alfaro
- Area Académica de Nutrición, Instituto de Ciencias de la Salud, Universidad Autónoma del Estado de Hidalgo, Hidalgo, Mexico
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17
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Schay G, Smeller L, Tsuneshige A, Yonetani T, Fidy J. Allosteric Effectors Influence the Tetramer Stability of Both R- and T-states of Hemoglobin A. J Biol Chem 2006; 281:25972-83. [PMID: 16822864 DOI: 10.1074/jbc.m604216200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The contribution of heterotropic effectors to hemoglobin allostery is still not completely understood. With the recently proposed global allostery model, this question acquires crucial significance, because it relates tertiary conformational changes to effector binding in both the R- and T-states. In this context, an important question is how far the induced conformational changes propagate from the binding site(s) of the allosteric effectors. We present a study in which we monitored the interdimeric interface when the effectors such as Cl-, 2,3-diphosphoglycerate, inositol hexaphosphate, and bezafibrate were bound. We studied oxy-Hb and a hybrid form (alphaFeO2)2-(betaZn)2 as the T-state analogue by monitoring heme absorption and Trp intrinsic fluorescence under hydrostatic pressure. We observed a pressure-dependent change in the intrinsic fluorescence, which we attribute to a pressure-induced tetramer to dimer transition with characteristic pressures in the 70-200-megapascal range. The transition is sensitive to the binding of allosteric effectors. We fitted the data with a simple model for the tetramer-dimer transition and determined the dissociation constants at atmospheric pressure. In the R-state, we observed a stabilizing effect by the allosteric effectors, although in the T-analogue a stronger destabilizing effect was seen. The order of efficiency was the same in both states, but with the opposite trend as inositol hexaphosphate > 2,3-diphosphoglycerate > Cl-. We detected intrinsic fluorescence from bound bezafibrate that introduced uncertainty in the comparison with other effectors. The results support the global allostery model by showing that conformational changes propagate from the effector binding site to the interdimeric interfaces in both quaternary states.
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Affiliation(s)
- Gusztáv Schay
- Department of Biophysics and Radiation Biology and Biophysics Research Group of the Hungarian Academy of Sciences, Faculty of Medicine, Semmelweis University, P. O. Box 263 H 1444 Budapest, Hungary
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Ma A, Rosenzweig Z. Synthesis and analytical properties of micrometric biosensing lipobeads. Anal Bioanal Chem 2005; 382:28-36. [PMID: 15900448 DOI: 10.1007/s00216-005-3186-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2004] [Revised: 02/14/2005] [Accepted: 02/15/2005] [Indexed: 11/29/2022]
Abstract
This paper describes the preparation for the first time of lipobead-based micrometric fluorescence biosensors and the optimization of their analytical properties. The study focused on the well-established urea biosensors as a model system. Fluorescence-sensing lipobeads were prepared by coating carboxyl-functionalized silica microspheres with phospholipids. The enzyme urease and the pH indicator fluorescein-5-thiosemicarbazide were then attached covalently to the phospholipid membrane of the lipobeads. Urease converts urea to ammonia, which results in a pH increase in the analyte solution and to a urea concentration-dependent increase in the fluorescence intensity of the sensing lipobeads. Previous fluorescence-sensing lipobeads were synthesized by coating polystyrene particles with a phospholipid membrane. The membrane was physically attached to the particles and the fluorophores were entrapped in the membrane. In this study, we prepared improved fluorescence-sensing lipobeads by utilizing covalent chemistry to bind the phospholipid membrane to the silica particles and the fluorophores to the membrane. This led to improvement in the stability of the newly developed urea-sensing lipobeads compared to previously developed miniaturized fluorescence biosensors.
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Affiliation(s)
- Aihui Ma
- Department of Chemistry, University of New Orleans, New Orleans, LA 70148, USA
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19
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Marchal S, Shehi E, Harricane MC, Fusi P, Heitz F, Tortora P, Lange R. Structural instability and fibrillar aggregation of non-expanded human ataxin-3 revealed under high pressure and temperature. J Biol Chem 2003; 278:31554-63. [PMID: 12766160 DOI: 10.1074/jbc.m304205200] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein misfolding and formation of structured aggregates are considered to be the earliest events in the development of neurodegenerative diseases, but the mechanism of these biological phenomena remains to be elucidated. Here, we report a study of heat- and pressure-induced unfolding of human Q26 and murine Q6 ataxin-3 using spectroscopic methods. UV absorbance and fluorescence revealed that heat and pressure induced a structural transition of both proteins to a molten globule conformation. The unfolding pathway was partly irreversible and led to a protein conformation where tryptophans were more exposed to water. Furthermore, the use of fluorescent probes (8-anilino-1-naphthalenesulfonate and thioflavin T) allowed the identification of different intermediates during the process of pressure-induced unfolding. At high temperature and pressure, human Q26, but not murine Q6, underwent concentration-dependent aggregation. Fourier transform infrared and circular dichroism spectroscopy revealed that these aggregates are characterized by an increased beta-sheet content. As revealed by electron microscopy, heat- and pressure-induced aggregates were different; high temperature treatment led to fibrillar microaggregates (8-10-nm length), whereas high pressure induced oligomeric structures of globular shape (100 nm in diameter), which sometimes aligned to higher order suprastructures. Several intermediate structures were detected in this process. Two factors appear to govern ataxin unfolding and aggregation, the length of the polyglutamine tract and its protein context.
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Affiliation(s)
- Stéphane Marchal
- INSERM U128, IFR 122, 1919 route de Mende, F-34293 Montpellier Cédex 5, France
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Trovaslet M, Dallet-Choisy S, Meersman F, Heremans K, Balny C, Legoy MD. Fluorescence and FTIR study of pressure-induced structural modifications of horse liver alcohol dehydrogenase (HLADH). EUROPEAN JOURNAL OF BIOCHEMISTRY 2003; 270:119-28. [PMID: 12492482 DOI: 10.1046/j.1432-1033.2003.03370.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The process of pressure-induced modification of horse liver alcohol dehydrogenase (HLADH) was followed by measuring in situ catalytic activity (up to 250 MPa), intrinsic fluorescence (0.1-600 MPa) and modifications of FTIR spectra (up to 1000 MPa). The tryptophan fluorescence measurements and the kinetic data indicated that the pressure-induced denaturation of HLADH was a process involving several transitions and that the observed transient states have characteristic properties of molten globules. Low pressure (< 100 MPa) induced no important modification in the catalytic efficiency of the enzyme and slight conformational changes, characterized by a small decrease in the centre of spectral mass of the enzyme's intrinsic fluorescence: a native-like state was assumed. Higher pressures (100-400 MPa) induced a strong decrease of HLADH catalytic efficiency and further conformational changes. At 400 MPa, a dimeric molten globule-like state was proposed. Further increase of pressure (400-600 MPa) seemed to induce the dissociation of the dimer leading to a transition from the first dimeric molten globule state to a second monomeric molten globule. The existence of two independent structural domains in HLADH was assumed to explain this transition: these domains were supposed to have different stabilities against high pressure-induced denaturation. FTIR spectroscopy was used to follow the changes in HLADH secondary structures. This technique confirmed that the intermediate states have a low degree of unfolding and that no completely denatured form seemed to be reached, even up to 1000 MPa.
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Affiliation(s)
- Marie Trovaslet
- Laboratoire de Génie Protéique et Cellulaire, Université de La Rochelle, France
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Ruan K, Li J, Liang R, Xu C, Yu Y, Lange R, Balny C. A rare protein fluorescence behavior where the emission is dominated by tyrosine: case of the 33-kDa protein from spinach photosystem II. Biochem Biophys Res Commun 2002; 293:593-7. [PMID: 12054643 DOI: 10.1016/s0006-291x(02)00247-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An abnormal fluorescence emission of protein was observed in the 33-kDa protein which is one component of the three extrinsic proteins in spinach photosystem II particle (PS II). This protein contains one tryptophan and eight tyrosine residues, belonging to a "B type protein". It was found that the 33-kDa protein fluorescence is very different from most B type proteins containing both tryptophan and tyrosine residues. For most B type proteins studied so far, the fluorescence emission is dominated by the tryptophan emission, with the tyrosine emission hardly being detected when excited at 280 nm. However, for the present 33-kDa protein, both tyrosine and tryptophan fluorescence emissions were observed, the fluorescence emission being dominated by the tyrosine residue emission upon a 280 nm excitation. The maximum emission wavelength of the 33-kDa protein tryptophan fluorescence was at 317 nm, indicating that the single tryptophan residue is buried in a very strong hydrophobic region. Such a strong hydrophobic environment is rarely observed in proteins when using tryptophan fluorescence experiments. All parameters of the protein tryptophan fluorescence such as quantum yield, fluorescence decay, and absorption spectrum including the fourth derivative spectrum were explored both in the native and pressure-denatured forms.
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Affiliation(s)
- Kangcheng Ruan
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Science Chinese Academy of Sciences, 320, Yue-Yang Road, Shanghai 200031, China.
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Ruan K, Balny C. High pressure static fluorescence to study macromolecular structure-function. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1595:94-102. [PMID: 11983389 DOI: 10.1016/s0167-4838(01)00337-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Through some typical examples, the high pressure static fluorescence method is described. The potentiality of the intrinsic and extrinsic fluorescence probes are analyzed for structural characterizations. Special attention is given to the use of fluorescence to understand the behavior of enzymatic reactions under high pressure. The application of fluorescence polarization is also presented together with some relevant spectroscopic problems inherent in data interpretation.
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Affiliation(s)
- Kangcheng Ruan
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Science, Chinese Academy of Sciences, Shanghai, PR China
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23
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Abstract
The locations of the 3' ends of RNAs in rat ribosome were studied by a fluorescence-labeling method combined with high hydrostatic pressure and agarose electrophoresis. Under physiological conditions, only the 3' ends of 28 S and 5.8 S RNA in 80 S ribosome could be labeled with a high sensitive fluorescent probe - fluorescein 5-thiosemicarbazide (FTSC), indicating that the 3' termini of 28 S and 5.8 S RNA were located on or near the surface of 80 S ribosome. The 3' terminus of 5 S RNA could be attacked by FTSC only in the case of the dissociation of the 80 S ribosome into two subunits induced by high salt concentration (1 M KCl) or at high hydrostatic pressure, showing that the 3' end of 5 S RNA was located on the interface of two subunits. However, no fluorescence-labeled 18 S RNA could be detected under all the conditions studied, suggesting that the 3' end of 18 S RNA was either located deeply inside ribosome or on the surface but protected by proteins. It was interesting to note that modifications of the 3' ends of ribosomal RNAs including oxidation with NaIO4, reduction with KBH4 and labeling with fluorescent probe did not destroy the translation activity of ribosome, indicating that the 3' ends of RNAs were not involved in the translation activity of ribosome.
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MESH Headings
- 3' Untranslated Regions/analysis
- Animals
- Cell-Free System/metabolism
- Electrophoresis, Agar Gel
- Fluorescent Dyes/chemistry
- Hydrostatic Pressure
- Kinetics
- Protein Biosynthesis
- RNA, Ribosomal/analysis
- RNA, Ribosomal, 18S/analysis
- RNA, Ribosomal, 18S/chemistry
- RNA, Ribosomal, 28S/analysis
- RNA, Ribosomal, 28S/chemistry
- RNA, Ribosomal, 5.8S/analysis
- RNA, Ribosomal, 5.8S/chemistry
- RNA, Ribosomal, 5S/analysis
- Rats
- Rats, Inbred Strains
- Ribosomes/chemistry
- Ribosomes/metabolism
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Affiliation(s)
- X Gao
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, The Chinese Academy of Sciences
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Roitel O, Bec N, Lange R, Balny C, Branlant G. Pressure denaturation of phosphorylating glyceraldehyde-3-phosphate dehydrogenase from Bacillus stearothermophilus. Biochem Biophys Res Commun 2001; 283:347-50. [PMID: 11327706 DOI: 10.1006/bbrc.2001.4779] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effects of hydrostatic pressure on apo wild-type glyceraldehyde-3-phosphate dehydrogenase (wtGAPDH) from Bacillus stearothermophilus (B. stearothermophilus) have been studied by fluorescence spectroscopy under pressure from 0.1 to 650 MPa. Unlike yeast GAPDH [Ruan, K. C., and Weber, G. (1989) Biochemistry 28, 2144-2153], denaturation of the tetrameric apo wtGAPDH from B. stearothermophilus is likely to precede dissociation into subunits. As expected, denaturation is accompanied by the loss of enzymatic activity. B. stearothermophilus apo wtGAPDH interfaces are less pressure sensitive than apo yeast GAPDH ones, while NAD does not protect B. stearothermophilus wtGAPDH against denaturation by pressure. The pressure effects on B. stearothermophilus GAPDH whose R and Q-axis interfaces were destabilized by disruption of interfacial hydrogen bonds are similar to that of apo wtGAPDH.
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Affiliation(s)
- O Roitel
- Maturation des ARN et Enzymologie Moléculaire, UMR 7567 CNRS-Université Henri Poincaré, Nancy I, Boulevard des Aiguillettes, Vandoeuvre-lès-Nancy, 54506, France
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Tian SM, Ruan KC, Qian JF, Shao GQ, Balny C. Effects of hydrostatic pressure on the structure and biological activity of infectious bursal disease virus. EUROPEAN JOURNAL OF BIOCHEMISTRY 2000; 267:4486-94. [PMID: 10880972 DOI: 10.1046/j.1432-1327.2000.01496.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The effects of high hydrostatic pressure on the structure and biological activity of infectious bursal disease virus (IBDV), a commercially important pathogen of chickens, were investigated. IBDV was completely dissociated into subunits at a pressure of 240 MPa and 0 degrees C revealed by the change in intrinsic fluorescence spectrum and light scattering. The dissociation of IBDV showed abnormal concentration dependence as observed for some other viruses. Electron microscopy study showed that morphology of IBDV had an obvious change after pressure treatment at 0 degrees C. It was found that elevating pressure destroyed the infectivity of IBDV, and a completely pressure-inactivated IBDV could be obtained under proper conditions. The pressure-inactivated IBDV retained the original immunogenic properties and could elicit high titers of virus neutralizing antibodies. These results indicate that hydrostatic pressure provides a potential physical means to prepare antiviral vaccine.
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Affiliation(s)
- S M Tian
- Shanghai Institute of Biochemistry, Chinese Academy of Sciences. la
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