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Colloc'h N, Dhaussy AC, Girard E. Exploring the structural dynamics of proteins by pressure perturbation using macromolecular crystallography. Methods Enzymol 2023; 688:349-381. [PMID: 37748831 DOI: 10.1016/bs.mie.2023.06.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
High pressure is a convenient thermodynamic parameter to probe the dynamics of proteins as it is intimately related to volume which is essential for protein function. To be biologically active, a protein fluctuates between different substates. Pressure perturbation can promote some hidden substates by modifying the population between them. High pressure macromolecular crystallography (HPMX) is a perfect tool to capture and to characterize such substates at a molecular level providing new insights on protein dynamics. The present chapter describes the use of the diamond anvil cell to perform HPMX experiments. It also provides tips on sample preparation and optimal data collection as well as on efficient analysis of the resulting high-pressure structures.
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Affiliation(s)
- Nathalie Colloc'h
- Imagerie et stratégies thérapeutiques pour les cancers et tissus cérébraux (ISTCT), CNRS Université de Caen Normandie, Centre Cyceron, Caen, France
| | | | - Eric Girard
- Univ. Grenoble Alpes, CEA, CNRS, IBS, Grenoble, France.
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2
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Guo Y, Huo J, Bai R, Zhang J, Yao J, Ma K, Zhang Z, Li H, Zhang C. The effects of free Cys residues on the structure, activity, and tetrameric stability of mammalian uricase. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12597-y. [PMID: 37256327 DOI: 10.1007/s00253-023-12597-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 05/04/2023] [Accepted: 05/10/2023] [Indexed: 06/01/2023]
Abstract
Mammalian uricases contain four conserved cysteine (Cys) residues, but little is known about their structures and functions. In this study, we first confirmed that all four Cys residues are free and not involved in disulfide bond formation, using canine uricase as a model protein. Cys residues had a greater effect on stability than on activity based on single Cys-to-Ser (serine) substitutions. Circular dichroism (CD) and homology modeling indicated that C188S reduces β-sheet contents and inter- and intra-subunit hydrophobic interaction, potentially impairing the core tetrameric β-barrel structure of the tunneling-fold protein, and ultimately decreased the tetrameric stability. Additionally, the inactivation of C188S during the stability tests may be a complex process involving depolymerization followed by irregular aggregation. Double mutations or thiol blockage of Cys188 and Cys195 significantly disrupted the formation and stability of tetrameric uricase, which may be mediated by the free thiols in Cys residues. The present results demonstrated that the free Cys residues are essential for tetrameric formation and stability in mammalian uricase. This implies that free cysteine residues, although not involved in disulfide bonding, may play important structural roles in certain proteins, underscoring the significance of the hydrophobic characteristics of the free thiols in Cys residues. KEY POINTS: • Four Cys residues are not involved in disulfide bonding in mammalian uricase. • The hydrophobicity of free thiols is critical for tetrameric stability in uricase. • Free Cys residues can serve structural roles without involving in disulfide bonds.
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Affiliation(s)
- Yong Guo
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China
| | - Jingjing Huo
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China
| | - Runchao Bai
- Shandong Center for Food and Drug Evaluation & Inspection, Jinan, 250022, Shandong, People's Republic of China
| | - Jingyuan Zhang
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China
| | - Jipeng Yao
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China
| | - Kaijie Ma
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China
| | - Zengtao Zhang
- Renrui Biotechnology Inc., Rizhao, 276599, Shandong, People's Republic of China
| | - Haigang Li
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China.
| | - Chun Zhang
- College of Pharmacy, Linyi University, Linyi, 276000, Shandong, People's Republic of China.
- Renrui Biotechnology Inc., Rizhao, 276599, Shandong, People's Republic of China.
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3
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Effects of high hydrostatic pressure treatment on the antigenicity, structural and digestive properties of whey protein. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2023.114628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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4
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Prangé T, Carpentier P, Dhaussy AC, van der Linden P, Girard E, Colloc'h N. Comparative study of the effects of high hydrostatic pressure per se and high argon pressure on urate oxidase ligand stabilization. Acta Crystallogr D Struct Biol 2022; 78:162-173. [DOI: 10.1107/s2059798321012134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/15/2021] [Indexed: 11/11/2022] Open
Abstract
The stability of the tetrameric enzyme urate oxidase in complex with excess of 8-azaxanthine was investigated either under high hydrostatic pressure per se or under a high pressure of argon. The active site is located at the interface of two subunits, and the catalytic activity is directly related to the integrity of the tetramer. This study demonstrates that applying pressure to a protein–ligand complex drives the thermodynamic equilibrium towards ligand saturation of the complex, revealing a new binding site. A transient dimeric intermediate that occurs during the pressure-induced dissociation process was characterized under argon pressure and excited substates of the enzyme that occur during the catalytic cycle can be trapped by pressure. Comparison of the different structures under pressure infers an allosteric role of the internal hydrophobic cavity in which argon is bound, since this cavity provides the necessary flexibility for the active site to function.
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5
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Baker SL, Murata H, Kaupbayeva B, Tasbolat A, Matyjaszewski K, Russell AJ. Charge-Preserving Atom Transfer Radical Polymerization Initiator Rescues the Lost Function of Negatively Charged Protein–Polymer Conjugates. Biomacromolecules 2019; 20:2392-2405. [DOI: 10.1021/acs.biomac.9b00379] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
| | | | | | - Adina Tasbolat
- Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, 71 Al-Farabi Avenue, Almaty 050040, Republic of Kazakhstan
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6
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Prangé T, Girard E, Fourme R, Dhaussy A, Edwards B, Vaishnav A, Patel C, Guy‐Evans H, Hervé G, Evans DR. Pressure‐induced activation of latent dihydroorotase from Aquifex aeolicusas revealed by high pressure protein crystallography. FEBS J 2019; 286:1204-1213. [DOI: 10.1111/febs.14758] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 12/19/2018] [Accepted: 01/15/2019] [Indexed: 01/25/2023]
Affiliation(s)
- Thierry Prangé
- Laboratoire de Cristallographie & RMN biologiques (UMR 8015 CNRS) Paris France
| | - Eric Girard
- CEA CNRS IBS Université Grenoble Alpes France
| | - Roger Fourme
- Synchrotron SOLEIL L'Orme des Merisiers Saint‐Aubin France
| | | | - Brian Edwards
- Department of Biochemistry and Molecular Biology Wayne State University School of Medicine Detroit MI USA
| | - Asmita Vaishnav
- Department of Biochemistry and Molecular Biology Wayne State University School of Medicine Detroit MI USA
| | - Chandni Patel
- Department of Biochemistry and Molecular Biology Wayne State University School of Medicine Detroit MI USA
| | - Hedeel Guy‐Evans
- Department of Chemistry Eastern Michigan University Ypsilanti MI USA
| | - Guy Hervé
- Laboratoire BIOSIPE Sorbonne Université Institut de Biologie Paris Seine Université Pierre et Marie Curie Paris France
| | - David R. Evans
- Department of Biochemistry and Molecular Biology Wayne State University School of Medicine Detroit MI USA
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7
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Weinrich M, Worcester DL. The actions of volatile anesthetics: a new perspective. Acta Crystallogr D Struct Biol 2018; 74:1169-1177. [PMID: 30605131 PMCID: PMC6317591 DOI: 10.1107/s2059798318004771] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 03/22/2018] [Indexed: 11/10/2022] Open
Abstract
This article reviews recent work in applying neutron and X-ray scattering towards the elucidation of the molecular mechanisms of volatile anesthetics. Experimental results on domain mixing in ternary lipid mixtures, and the influence of volatile anesthetics and hydrostatic pressure are placed in the contexts of ion-channel function and receptor trafficking at the postsynaptic density.
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8
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Shifting Retroviral Vector Integrations Away from Transcriptional Start Sites via DNA-Binding Protein Domain Insertion into Integrase. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2018; 12:58-70. [PMID: 30534579 PMCID: PMC6278723 DOI: 10.1016/j.omtm.2018.11.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 11/06/2018] [Indexed: 12/13/2022]
Abstract
The unique ability of retroviruses to integrate genes into host genomes is of great value for long-term expression in gene therapy, but only when integrations occur at safe genomic sites. To reap the benefit of using retroviruses without severe detrimental effects, we developed several murine leukemia virus (MLV)-based gammaretroviral vectors with safer integration patterns by perturbing the structure of the integrase via insertion of DNA-binding zinc-finger domains (ZFDs) into an internal position of the enzyme. ZFD insertion significantly reduced the inherent, strong MLV integration preference for genomic regions near transcriptional start sites (TSSs), which are the most dangerous spots. The altered retroviral integration pattern was related to increased formation of residual primer-binding site sequences at the 3' end of proviruses. Several ZFD insertion mutants showed lower frequencies of integrations into the TSS genome regions when having the residual primer-binding site sequences in the proviruses. Our findings not only can extend the use of retroviruses in biomedical applications, but also provide a glimpse into the mechanisms underlying retroviral integration.
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9
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Xenon for tunnelling analysis of the efflux pump component OprN. PLoS One 2017; 12:e0184045. [PMID: 28886086 PMCID: PMC5590881 DOI: 10.1371/journal.pone.0184045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 08/17/2017] [Indexed: 12/02/2022] Open
Abstract
Tripartite efflux pumps are among the main actors responsible for antibiotics resistance in Gram-negative bacteria. In the last two decades, structural studies gave crucial information about the assembly interfaces and the mechanistic motions. Thus rigidifying the assembly seems to be an interesting way to hamper the drug efflux. In this context, xenon is a suitable probe for checking whether small ligands could act as conformational lockers by targeting hydrophobic cavities. Here we focus on OprN, the outer membrane channel of the MexEF efflux pump from Pseudomonas aeruginosa. After exposing OprN crystals to xenon gas pressure, 14 binding sites were observed using X-ray crystallography. These binding sites were unambiguously characterized in hydrophobic cavities of OprN. The major site is observed in the sensitive iris-like region gating the channel at the periplasmic side, built by the three key-residues Leu 405, Asp 109, and Arg 412. This arrangement defines along the tunnel axis a strong hydrophobic/polar gradient able to enhance the passive efflux mechanism of OprN. The other xenon atoms reveal strategic hydrophobic regions of the channel scaffold to target, with the aim to freeze the dynamic movements responsible of the open/close conformational equilibrium in OprN.
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10
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Effects of high hydrostatic pressure or hydrophobic modification on thermal stability of xanthine oxidase. Enzyme Microb Technol 2017; 103:18-24. [DOI: 10.1016/j.enzmictec.2017.04.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 04/15/2017] [Accepted: 04/21/2017] [Indexed: 11/22/2022]
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11
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Colloc'h N, Sacquin-Mora S, Avella G, Dhaussy AC, Prangé T, Vallone B, Girard E. Determinants of neuroglobin plasticity highlighted by joint coarse-grained simulations and high pressure crystallography. Sci Rep 2017; 7:1858. [PMID: 28500341 PMCID: PMC5431840 DOI: 10.1038/s41598-017-02097-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 03/20/2017] [Indexed: 11/09/2022] Open
Abstract
Investigating the effect of pressure sheds light on the dynamics and plasticity of proteins, intrinsically correlated to functional efficiency. Here we detail the structural response to pressure of neuroglobin (Ngb), a hexacoordinate globin likely to be involved in neuroprotection. In murine Ngb, reversible coordination is achieved by repositioning the heme more deeply into a large internal cavity, the “heme sliding mechanism”. Combining high pressure crystallography and coarse-grain simulations on wild type Ngb as well as two mutants, one (V101F) with unaffected and another (F106W) with decreased affinity for CO, we show that Ngb hinges around a rigid mechanical nucleus of five hydrophobic residues (V68, I72, V109, L113, Y137) during its conformational transition induced by gaseous ligand, that the intrinsic flexibility of the F-G loop appears essential to drive the heme sliding mechanism, and that residue Val 101 may act as a sensor of the interaction disruption between the heme and the distal histidine.
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Affiliation(s)
- Nathalie Colloc'h
- ISTCT CNRS UNICAEN CEA Normandie Univ., CERVOxy team, centre Cyceron, 14000, Caen, France.
| | - Sophie Sacquin-Mora
- Laboratoire de Biochimie Théorique, CNRS UPR9080, Institut de Biologie Physico-Chimique, 13 rue Pierre et Marie Curie, 75005, Paris, France
| | - Giovanna Avella
- Instituto Pasteur-Fondazione Cenci Bolognetti and Dipartimento di Scienze Biochimiche 'A. Rossi Fanelli', Sapienza Università di Roma, 5 piazzale Aldo Moro, 00185, Roma, Italy.,BIOGEM Research Institute, Ariano Irpino, Italy
| | - Anne-Claire Dhaussy
- CRISTMAT UMR 6508 CNRS ENSICAEN UNICAEN Normandie Univ., 6 bd du Maréchal Juin, 14050, Caen, France
| | - Thierry Prangé
- LCRB, UMR 8015 CNRS Université Paris Descartes, 4 avenue de l'Observatoire, 75270, Paris, France
| | - Beatrice Vallone
- Instituto Pasteur-Fondazione Cenci Bolognetti and Dipartimento di Scienze Biochimiche 'A. Rossi Fanelli', Sapienza Università di Roma, 5 piazzale Aldo Moro, 00185, Roma, Italy
| | - Eric Girard
- Institut de Biologie Structurale (IBS), Université Grenoble Alpes, CEA, CNRS, 38044, Grenoble, France.
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12
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Turecek PL, Bossard MJ, Schoetens F, Ivens IA. PEGylation of Biopharmaceuticals: A Review of Chemistry and Nonclinical Safety Information of Approved Drugs. J Pharm Sci 2016; 105:460-475. [PMID: 26869412 DOI: 10.1016/j.xphs.2015.11.015] [Citation(s) in RCA: 456] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 10/01/2015] [Accepted: 10/30/2015] [Indexed: 01/01/2023]
Abstract
Modification of biopharmaceutical molecules by covalent conjugation of polyethylene glycol (PEG) molecules is known to enhance pharmacologic and pharmaceutical properties of proteins and other large molecules and has been used successfully in 12 approved drugs. Both linear and branched-chain PEG reagents with molecular sizes of up to 40 kDa have been used with a variety of different PEG derivatives with different linker chemistries. This review describes the properties of PEG itself, the history and evolution of PEGylation chemistry, and provides examples of PEGylated drugs with an established medical history. A trend toward the use of complex PEG architectures and larger PEG polymers, but with very pure and well-characterized PEG reagents is described. Nonclinical toxicology findings related to PEG in approved PEGylated biopharmaceuticals are summarized. The effect attributed to the PEG part of the molecules as observed in 5 of the 12 marketed products was cellular vacuolation seen microscopically mainly in phagocytic cells which is likely related to their biological function to absorb and remove particles and macromolecules from blood and tissues. Experience with marketed PEGylated products indicates that adverse effects in toxicology studies are usually related to the active part of the drug but not to the PEG moiety.
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Affiliation(s)
| | - Mary J Bossard
- Nektar Therapeutics, Department of Polymer Chemistry, Huntsville, Alabama 35801-5914
| | | | - Inge A Ivens
- Bayer, Toxicology, San Francisco, California 94158
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13
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Ingr M, Kutálková E, Hrnčiřík J, Lange R. Equilibria of oligomeric proteins under high pressure - A theoretical description. J Theor Biol 2016; 411:16-26. [PMID: 27717844 DOI: 10.1016/j.jtbi.2016.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 09/14/2016] [Accepted: 10/03/2016] [Indexed: 01/18/2023]
Abstract
High pressure methods have become a useful tool for studying protein structure and stability. Using them, various physico-chemical processes including protein unfolding, aggregation, oligomer dissociation or enzyme-activity decrease were studied on many different proteins. Oligomeric protein dissociation is a process that can perfectly utilize the potential of high-pressure techniques, as the high pressure shifts the equilibria to higher concentrations making them better observable by spectroscopic methods. This can be especially useful when the oligomeric form is highly stable at atmospheric pressure. These applications may be, however, hindered by less intensive experimental response as well as interference of the oligomerization equilibria with unfolding or aggregation of the subunits, but also by more complex theoretical description. In this study we develop mathematical models describing different kinds of oligomerization equilibria, both closed (equilibrium of monomer and the highest possible oligomer without any intermediates) and consecutive. Closed homooligomer equilibria are discussed for any oligomerization degree, while the more complex heterooligomer equilibria and the consecutive equilibria in both homo- and heterooligomers are taken into account only for dimers and trimers. In all the cases, fractions of all the relevant forms are evaluated as functions of pressure and concentration. Significant points (inflection points and extremes) of the resulting transition curves, that can be determined experimentally, are evaluated as functions of pressure and/or concentration. These functions can be further used in order to evaluate the thermodynamic parameters of the system, i.e. atmospheric-pressure equilibrium constants and volume changes of the individual steps of the oligomer-dissociation processes.
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Affiliation(s)
- Marek Ingr
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, nám. T. G. Masaryka 5555, 76001 Zlín, Czechia; Charles University in Prague, Faculty of Science, Department of Biochemistry, Hlavova 2030, 12843 Prague 2, Czechia.
| | - Eva Kutálková
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, nám. T. G. Masaryka 5555, 76001 Zlín, Czechia
| | - Josef Hrnčiřík
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, nám. T. G. Masaryka 5555, 76001 Zlín, Czechia
| | - Reinhard Lange
- Université Montpellier, INRA UMR IATE, Biochimie et Technologie Alimentaires, cc023, Place Eugene Bataillon, 34095 Montpellier Cedex 05, France
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Alishah K, Asad S, Khajeh K, Akbari N. Utilizing intein-mediated protein cleaving for purification of uricase, a multimeric enzyme. Enzyme Microb Technol 2016; 93-94:92-98. [PMID: 27702489 DOI: 10.1016/j.enzmictec.2016.08.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 07/04/2016] [Accepted: 08/01/2016] [Indexed: 11/16/2022]
Abstract
Uric acid, a side product of nucleotide metabolism, should be cleared from blood stream since its accumulation can cause cardiovascular diseases and gout. Uricase (urate oxidase) converts uric acid to 5-hydroxyisourate, but it is absent in human and other higher apes. Yet, the recombinant form of uricase, Rasburicase, is now commercially available to cure tumor lysis syndrome by lowering serum uric acid level. Developing new methods to efficiently purify pharmaceutical proteins like uricase has attracted researchers' attention. Self-cleaving intein mediated single column purification is one of these novel approaches. Self-cleaving inteins are modified forms of natural inteins that can excise and join only at one junction site. In this study, the synthetic gene of Aspergillus flavus uricase, a homotetrameric protein, was cloned into pTXB1 vector as a fusion with the N-terminal of Mxe GyrA intein and chitin-binding domain (CBD) for simple purification. Expression was confirmed by western blot analysis. The fusion protein containing uricase-intein-CBD was purified on a chitin column. The cleavage was induced by adding DTT,1 as a reducing agent to release uricase. The purity of uricase and complete excision of the intein and CBD were confirmed by SDS-PAGE2 while its proper folding was proved by circular dichroism and fluorescent emission studies. Isoelectric focusing further confirmed its homogeneity when a single protein band was observed at the predicted pI value. This is the first report of successful purification of a multimeric therapeutic enzyme by intein-mediated protein cleaving using a well-established and facile system.
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Affiliation(s)
- Khadijeh Alishah
- Department of Biotechnology, College of Science, University of Tehran, Tehran, Iran
| | - Sedigheh Asad
- Department of Biotechnology, College of Science, University of Tehran, Tehran, Iran.
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
| | - Neda Akbari
- Department of Microbiology, Faculty of Science, Islamic Azad University, Arak, Iran
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15
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Aviner B, Gradwohl G, Bliznyuk A, Grossman Y. Selective pressure modulation of synaptic voltage-dependent calcium channels-involvement in HPNS mechanism. J Cell Mol Med 2016; 20:1872-88. [PMID: 27273194 PMCID: PMC5020619 DOI: 10.1111/jcmm.12877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 03/21/2016] [Indexed: 11/28/2022] Open
Abstract
Exposure to hyperbaric pressure (HP) exceeding 100 msw (1.1 MPa) is known to cause a constellation of motor and cognitive impairments named high-pressure neurological syndrome (HPNS), considered to be the result of synaptic transmission alteration. Long periods of repetitive HP exposure could be an occupational risk for professional deep-sea divers. Previous studies have indicated the modulation of presynaptic Ca(2+) currents based on synaptic activity modified by HP. We have recently demonstrated that currents in genetically identified cellular voltage-dependent Ca(2+) channels (VDCCs), CaV 1.2 and CaV 3.2 are selectively affected by HP. This work further elucidates the HPNS mechanism by examining HP effect on Ca(2+) currents in neuronal VDCCs, CaV 2.2 and CaV 2.1, which are prevalent in presynaptic terminals, expressed in Xenopus oocytes. HP augmented the CaV 2.2 current amplitude, much less so in a channel variation containing an additional modulatory subunit, and had almost no effect on the CaV 2.1 currents. HP differentially affected the channels' kinetics. It is, therefore, suggested that HPNS signs and symptoms arise, at least in part, from pressure modulation of various VDCCs.
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Affiliation(s)
- Ben Aviner
- Department of Physiology and Neurobiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel.
| | - Gideon Gradwohl
- Department of Physics, Jerusalem College of Technology, Jerusalem, Israel
| | - Alice Bliznyuk
- Department of Physiology and Neurobiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Yoram Grossman
- Department of Physiology and Neurobiology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
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16
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Worcester DL, Weinrich M. Hydrostatic Pressure Promotes Domain Formation in Model Lipid Raft Membranes. J Phys Chem Lett 2015; 6:4417-4421. [PMID: 26538052 DOI: 10.1021/acs.jpclett.5b02134] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Neutron diffraction measurements demonstrate that hydrostatic pressure promotes liquid-ordered (Lo) domain formation in lipid membranes prepared as both oriented multilayers and unilamellar vesicles made of a canonical ternary lipid mixture for which demixing transitions have been extensively studied. The results demonstrate an unusually large dependence of the mixing transition on hydrostatic pressure. Additionally, data at 28 °C show that the magnitude of increase in Lo caused by 10 MPa pressure is much the same as the decrease in Lo produced by twice minimum alveolar concentrations (MAC) of general anesthetics such as halothane, nitrous oxide, and xenon. Therefore, the results may provide a plausible explanation for the reversal of general anesthesia by hydrostatic pressure.
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Affiliation(s)
- David L Worcester
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg 20899, Maryland, United States
- Department of Physiology and Biophysics, University of California , Irvine 92697, California, United States
| | - Michael Weinrich
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg 20899, Maryland, United States
- Eunice Kennedy Shriver National Center of Child Health and Human Development, National Institutes of Health , 31 Center Drive, Bethesda 20892, Maryland, United States
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17
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Abstract
At the molecular level, high-pressure perturbation is of particular interest for biological studies as it allows trapping conformational substates. Moreover, within the context of high-pressure adaptation of deep-sea organisms, it allows to decipher the molecular determinants of piezophily. To provide an accurate description of structural changes produced by pressure in a macromolecular system, developments have been made to adapt macromolecular crystallography to high-pressure studies. The present chapter is an overview of results obtained so far using high-pressure macromolecular techniques, from nucleic acids to virus capsid through monomeric as well as multimeric proteins.
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18
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Hamdane D, Bou-Nader C, Cornu D, Hui-Bon-Hoa G, Fontecave M. Flavin-Protein Complexes: Aromatic Stacking Assisted by a Hydrogen Bond. Biochemistry 2015; 54:4354-64. [PMID: 26120776 DOI: 10.1021/acs.biochem.5b00501] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Enzyme-catalyzed reactions often rely on a noncovalently bound cofactor whose reactivity is tuned by its immediate environment. Flavin cofactors, the most versatile catalyst encountered in biology, are often maintained within the protein throughout numbers of complex ionic and aromatic interactions. Here, we have investigated the role of π-π stacking and hydrogen bond interactions between a tyrosine and the isoalloxazine moiety of the flavin adenine dinucleotide (FAD) in an FAD-dependent RNA methyltransferase. Combining several static and time-resolved spectroscopies as well as biochemical approaches, we showed that aromatic stacking is assisted by a hydrogen bond between the phenol group and the amide of an adjacent active site loop. A mechanism of recognition and binding of the redox cofactor is proposed.
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Affiliation(s)
- Djemel Hamdane
- †Laboratoire de Chimie des Processus Biologiques, CNRS-UMR 8229, Collège De France, France 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - Charles Bou-Nader
- †Laboratoire de Chimie des Processus Biologiques, CNRS-UMR 8229, Collège De France, France 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
| | - David Cornu
- ‡INSERM U779, 78 Rue du Général Leclerc, 94275 Le Kremlin-Bicêtre, France
| | - Gaston Hui-Bon-Hoa
- §Plateforme IMAGIF, Centre de Recherche de Gif, Centre National de la Recherche Scientifique, 1 avenue de le terrasse, 91191 Gif Sur Yvette, France
| | - Marc Fontecave
- †Laboratoire de Chimie des Processus Biologiques, CNRS-UMR 8229, Collège De France, France 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
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19
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Microbial diversity and adaptation to high hydrostatic pressure in deep-sea hydrothermal vents prokaryotes. Extremophiles 2015; 19:721-40. [DOI: 10.1007/s00792-015-0760-3] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 05/26/2015] [Indexed: 12/15/2022]
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20
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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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21
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Meersman F, McMillan PF. High hydrostatic pressure: a probing tool and a necessary parameter in biophysical chemistry. Chem Commun (Camb) 2014; 50:766-75. [PMID: 24286104 DOI: 10.1039/c3cc45844j] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High pressures extending up to several thousands of atmospheres provide extreme conditions for biological organisms to survive. Recent studies are investigating the survival mechanisms and biological function of microorganisms under natural and laboratory conditions extending into the GigaPascal range, with applications to understanding the Earth's deep biosphere and food technology. High pressure has also emerged as a useful tool and physical parameter for probing changes in the structure and functional properties of biologically important macromolecules and polymers encountered in soft matter science. Here we highlight some areas of current interest in high pressure biophysics and physical chemistry that are emerging at the frontier of this cross-disciplinary field.
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Affiliation(s)
- Filip Meersman
- Department of Chemistry, University College London, 20 Gordon St., London WC1H 0AJ, UK.
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22
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Crystallographic Studies with Xenon and Nitrous Oxide Provide Evidence for Protein-dependent Processes in the Mechanisms of General Anesthesia. Anesthesiology 2014; 121:1018-27. [DOI: 10.1097/aln.0000000000000435] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Abstract
Background:
The mechanisms by which general anesthetics, including xenon and nitrous oxide, act are only beginning to be discovered. However, structural approaches revealed weak but specific protein–gas interactions.
Methods:
To improve knowledge, we performed x-ray crystallography studies under xenon and nitrous oxide pressure in a series of 10 binding sites within four proteins.
Results:
Whatever the pressure, we show (1) hydrophobicity of the gas binding sites has a screening effect on xenon and nitrous oxide binding, with a threshold value of 83% beyond which and below which xenon and nitrous oxide, respectively, binds to their sites preferentially compared to each other; (2) xenon and nitrous oxide occupancies are significantly correlated respectively to the product and the ratio of hydrophobicity by volume, indicating that hydrophobicity and volume are binding parameters that complement and oppose each other’s effects; and (3) the ratio of occupancy of xenon to nitrous oxide is significantly correlated to hydrophobicity of their binding sites.
Conclusions:
These data demonstrate that xenon and nitrous oxide obey different binding mechanisms, a finding that argues against all unitary hypotheses of narcosis and anesthesia, and indicate that the Meyer–Overton rule of a high correlation between anesthetic potency and solubility in lipids of general anesthetics is often overinterpreted. This study provides evidence that the mechanisms of gas binding to proteins and therefore of general anesthesia should be considered as the result of a fully reversible interaction between a drug ligand and a receptor as this occurs in classical pharmacology.
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23
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Kutálková E, Hrnčiřík J, Ingr M. Pressure induced structural changes and dimer destabilization of HIV-1 protease studied by molecular dynamics simulations. Phys Chem Chem Phys 2014; 16:25906-15. [DOI: 10.1039/c4cp03676j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Mapping protein conformational heterogeneity under pressure with site-directed spin labeling and double electron-electron resonance. Proc Natl Acad Sci U S A 2014; 111:E1201-10. [PMID: 24707053 DOI: 10.1073/pnas.1403179111] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The dominance of a single native state for most proteins under ambient conditions belies the functional importance of higher-energy conformational states (excited states), which often are too sparsely populated to allow spectroscopic investigation. Application of high hydrostatic pressure increases the population of excited states for study, but structural characterization is not trivial because of the multiplicity of states in the ensemble and rapid (microsecond to millisecond) exchange between them. Site-directed spin labeling in combination with double electron-electron resonance (DEER) provides long-range (20-80 Å) distance distributions with angstrom-level resolution and thus is ideally suited to resolve conformational heterogeneity in an excited state populated under high pressure. DEER currently is performed at cryogenic temperatures. Therefore, a method was developed for rapidly freezing spin-labeled proteins under pressure to kinetically trap the high-pressure conformational ensemble for subsequent DEER data collection at atmospheric pressure. The methodology was evaluated using seven doubly-labeled mutants of myoglobin designed to monitor selected interhelical distances. For holomyoglobin, the distance distributions are narrow and relatively insensitive to pressure. In apomyoglobin, on the other hand, the distributions reveal a striking conformational heterogeneity involving specific helices in the pressure range of 0-3 kbar, where a molten globule state is formed. The data directly reveal the amplitude of helical fluctuations, information unique to the DEER method that complements previous rate determinations. Comparison of the distance distributions for pressure- and pH-populated molten globules shows them to be remarkably similar despite a lower helical content in the latter.
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25
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Colloc'h N, Prangé T. Functional relevance of the internal hydrophobic cavity of urate oxidase. FEBS Lett 2014; 588:1715-9. [PMID: 24657440 DOI: 10.1016/j.febslet.2014.03.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 03/10/2014] [Accepted: 03/10/2014] [Indexed: 10/25/2022]
Abstract
Urate oxidase from Aspergillus flavus is a 135 kDa homo-tetramer which has a hydrophobic cavity buried within each monomer and located close to its active site. Crystallographic studies under moderate gas pressure and high hydrostatic pressure have shown that both gas presence and high pressure would rigidify the cavity leading to an inhibition of the catalytic activity. Analysis of the cavity volume variations and functional modifications suggest that the flexibility of the cavity would be an essential parameter for the active site efficiency. This cavity would act as a connecting vessel to give flexibility to the neighboring active site, and its expansion under pure oxygen pressure reveals that it might serve as a transient reservoir on its pathway to the active site.
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Affiliation(s)
- Nathalie Colloc'h
- CERVoxy Team, ISTCT UMR 6301, CNRS, Centre Cyceron, Caen, France; ISTCT UMR 6301, CEA, DSV/I2BM, Caen, France; ISTCT UMR 6301, Université de Caen Basse-Normandie, Normandie Université, Caen, France.
| | - Thierry Prangé
- LCRB UMR 8015, CNRS, Université Paris Descartes, Faculté de Pharmacie, 4 Avenue de l'Observatoire, 75006 Paris, France
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26
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Somkuti J, Smeller L. High pressure effects on allergen food proteins. Biophys Chem 2013; 183:19-29. [DOI: 10.1016/j.bpc.2013.06.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 06/03/2013] [Accepted: 06/04/2013] [Indexed: 10/26/2022]
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27
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Circular dichroism and site-directed spin labeling reveal structural and dynamical features of high-pressure states of myoglobin. Proc Natl Acad Sci U S A 2013; 110:E4714-22. [PMID: 24248390 DOI: 10.1073/pnas.1320124110] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Excited states of proteins may play important roles in function, yet are difficult to study spectroscopically because of their sparse population. High hydrostatic pressure increases the equilibrium population of excited states, enabling their characterization [Akasaka K (2003) Biochemistry 42:10875-85]. High-pressure site-directed spin-labeling EPR (SDSL-EPR) was developed recently to map the site-specific structure and dynamics of excited states populated by pressure. To monitor global secondary structure content by circular dichroism (CD) at high pressure, a modified optical cell using a custom MgF2 window with a reduced aperture is introduced. Here, a combination of SDSL-EPR and CD is used to map reversible structural transitions in holomyoglobin and apomyoglobin (apoMb) as a function of applied pressure up to 2 kbar. CD shows that the high-pressure excited state of apoMb at pH 6 has helical content identical to that of native apoMb, but reversible changes reflecting the appearance of a conformational ensemble are observed by SDSL-EPR, suggesting a helical topology that fluctuates slowly on the EPR time scale. Although the high-pressure state of apoMb at pH 6 has been referred to as a molten globule, the data presented here reveal significant differences from the well-characterized pH 4.1 molten globule of apoMb. Pressure-populated states of both holomyoglobin and apoMb at pH 4.1 have significantly less helical structure, and for the latter, that may correspond to a transient folding intermediate.
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28
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Chavas LMG, Nagae T, Yamada H, Watanabe N, Yamada Y, Hiraki M, Matsugaki N. New methodologies at PF AR-NW12A: the implementation of high-pressure macromolecular crystallography. JOURNAL OF SYNCHROTRON RADIATION 2013; 20:838-842. [PMID: 24121324 PMCID: PMC3795540 DOI: 10.1107/s0909049513020797] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 07/25/2013] [Indexed: 06/02/2023]
Abstract
The macromolecular crystallography (MX) beamline AR-NW12A is evolving from its original design of high-throughput crystallography to a multi-purpose end-station. Among the various options to be implemented, great efforts were made in making available high-pressure MX (HPMX) at the beamline. High-pressure molecular biophysics is a developing field that attracts the interest of a constantly growing scientific community. A plethora of activities can benefit from high pressure, and investigations have been performed on its applicability to study multimeric complex assemblies, compressibility of proteins and their crystals, macromolecules originating from extremophiles, or even the trapping of higher-energy conformers for molecules of biological interest. Recent studies using HPMX showed structural hydrostatic-pressure-induced changes in proteins. The conformational modifications could explain the enzymatic mechanism differences between proteins of the same family, living at different environmental pressures, as well as the initial steps in the pressure-denaturation process that have been attributed to water penetration into the protein interior. To facilitate further HPMX, while allowing access to various individualized set-ups and experiments, the AR-NW12A sample environment has been revisited. Altogether, the newly added implementations will bring a fresh breath of life to AR-NW12A and allow the MX community to experiment in a larger set of fields related to structural biology.
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Affiliation(s)
| | - Tadayuki Nagae
- Venture Business Laboratory, Nagoya University, Nagoya, Aichi 464-8603, Japan
- Department of Biotechnology, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Hiroyuki Yamada
- Department of Biotechnology, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Nobuhisa Watanabe
- Department of Biotechnology, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
- Synchrotron Radiation Research Center, Nagoya University, Furo-cho Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Yusuke Yamada
- Structural Biology Research Center, PF/IMSS/KEK, 1-1 Oho, Tsukuba, Ibaraki 300-0801, Japan
| | - Masahiko Hiraki
- Structural Biology Research Center, PF/IMSS/KEK, 1-1 Oho, Tsukuba, Ibaraki 300-0801, Japan
| | - Naohiro Matsugaki
- Structural Biology Research Center, PF/IMSS/KEK, 1-1 Oho, Tsukuba, Ibaraki 300-0801, Japan
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29
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Caves MS, Derham BK, Jezek J, Freedman RB. Thermal inactivation of uricase (urate oxidase): mechanism and effects of additives. Biochemistry 2013; 52:497-507. [PMID: 23237426 DOI: 10.1021/bi301334w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Uricase (Urc) is an oxidoreductase enzyme of both general and commercial interest, the former because of its lack of a cofactor and the latter because of its use in the treatment of hyperuricemic disorders. Results of fluorometry and circular dichroism (CD) spectroscopy indicate that the main phase of thermal Urc inactivation follows an irreversible two-state mechanism, with loss of ~20% of the helical structure, loss of the majority of the tertiary structure, and partial exposure of tryptophan residues to solution being approximately concurrent with activity loss. Results of size exclusion chromatography and 8-anilinonaphthalene-1-sulfonate binding studies confirm that this process results in the formation of aggregated molten globules. In addition to this process, CD studies indicate the presence of a rapid reversible denaturation phase that is not completely coupled to the main phase. Urc inactivation is inhibited by the presence of glycerol and trimethylamine oxide, stabilizers of hydrophobic interactions and backbone structure respectively, confirming that loss of hydrophobic bonding and loss of helical structure are key events in the loss of Urc activity. NaCl, however, destabilizes the enzyme at elevated temperature, emphasizing the importance of ionic interactions to Urc stability. A model is developed in which interfacial disruption, involving local loss of hydrophobic interactions, ionic bonds, and helical structure, leads to Urc inactivation and aggregation. Additional studies of Urc inactivation at a more ambient temperature indicate that the inactivation process followed under such conditions is different from that followed at higher temperatures, highlighting the limitations of high-temperature enzyme stability studies.
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Affiliation(s)
- Michael S Caves
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK.
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30
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Pérez J, Nishino Y. Advances in X-ray scattering: from solution SAXS to achievements with coherent beams. Curr Opin Struct Biol 2012; 22:670-8. [DOI: 10.1016/j.sbi.2012.07.014] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 07/24/2012] [Accepted: 07/27/2012] [Indexed: 11/15/2022]
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31
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Fourme R, Girard E, Akasaka K. High-pressure macromolecular crystallography and NMR: status, achievements and prospects. Curr Opin Struct Biol 2012; 22:636-42. [PMID: 22959123 DOI: 10.1016/j.sbi.2012.07.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Revised: 07/08/2012] [Accepted: 07/09/2012] [Indexed: 10/27/2022]
Abstract
Biomacromolecules are thermodynamic entities that exist in general as an equilibrium mixture of the basic folded state and various higher-energy substates including all functionally relevant ones. Under physiological conditions, however, the higher-energy substates are usually undetectable on spectroscopy, as their equilibrium populations are extremely low. Hydrostatic pressure gives a general solution to this problem. As proteins generally have smaller partial molar volumes in higher-energy states than in the basic folded state, pressure can shift the equilibrium toward the former substantially, and allows their direct detection and analysis with X-ray crystallography or NMR spectroscopy at elevated pressures. These techniques are now mature, and their status and selected applications are presented with future prospects.
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Affiliation(s)
- Roger Fourme
- Synchrotron Soleil, BP48 Saint Aubin, 91192 Gif sur Yvette, France.
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32
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Nagae T, Kawamura T, Chavas LMG, Niwa K, Hasegawa M, Kato C, Watanabe N. High-pressure-induced water penetration into 3-isopropylmalate dehydrogenase. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2012; 68:300-9. [PMID: 22349232 PMCID: PMC3282623 DOI: 10.1107/s0907444912001862] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Accepted: 01/16/2012] [Indexed: 11/30/2022]
Abstract
Hydrostatic pressure induces structural changes in proteins, including denaturation, the mechanism of which has been attributed to water penetration into the protein interior. In this study, structures of 3-isopropylmalate dehydrogenase (IPMDH) from Shewanella oneidensis MR-1 were determined at about 2 Å resolution under pressures ranging from 0.1 to 650 MPa using a diamond anvil cell (DAC). Although most of the protein cavities are monotonically compressed as the pressure increases, the volume of one particular cavity at the dimer interface increases at pressures over 340 MPa. In parallel with this volume increase, water penetration into the cavity could be observed at pressures over 410 MPa. In addition, the generation of a new cleft on the molecular surface accompanied by water penetration could also be observed at pressures over 580 MPa. These water-penetration phenomena are considered to be initial steps in the pressure-denaturation process of IPMDH.
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Affiliation(s)
- Takayuki Nagae
- Department of Biotechnology, Graduate School of Engineering, Nagoya University, Japan
| | | | - Leonard M. G. Chavas
- Structural Biology Research Center, Photon Factory, High Energy Research Organization (KEK), Japan
| | - Ken Niwa
- Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University, Japan
| | - Masashi Hasegawa
- Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University, Japan
| | - Chiaki Kato
- Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Japan
| | - Nobuhisa Watanabe
- Department of Biotechnology, Graduate School of Engineering, Nagoya University, Japan
- Synchrotron Radiation Research Center, Nagoya University, Japan
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33
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Chen WQ, Heymann G, Kursula P, Rosner M, Hengstschläger M, Huppertz H, Lubec G. Effects of Gigapascal Level Pressure on Protein Structure and Function. J Phys Chem B 2012; 116:1100-10. [DOI: 10.1021/jp207864c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Qiang Chen
- Department of Pediatrics, Medical University of Vienna, Währinger Gürtel 18, 1090 Vienna, Austria
| | - Gunter Heymann
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52; 6020 Innsbruck, Austria
| | - Petri Kursula
- Department of Biochemistry, University of Oulu, PL3000; 90014 Oulu, Finland
- Centre for Structural Systems Biology (CSSB-HZI), German Electron Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
| | - Margit Rosner
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, 1090 Vienna, Austria
| | - Markus Hengstschläger
- Institute of Medical Genetics, Medical University of Vienna, Währinger Straße 10, 1090 Vienna, Austria
| | - Hubert Huppertz
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52; 6020 Innsbruck, Austria
| | - Gert Lubec
- Department of Pediatrics, Medical University of Vienna, Währinger Gürtel 18, 1090 Vienna, Austria
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34
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Mechanism of action of nitrogen pressure in controlling striatal dopamine level of freely moving rats is changed by recurrent exposures to nitrogen narcosis. Neurochem Res 2011; 37:655-64. [PMID: 22127756 DOI: 10.1007/s11064-011-0657-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 10/26/2011] [Accepted: 11/09/2011] [Indexed: 10/15/2022]
Abstract
In rats, a single exposure to 3 MPa nitrogen induces change in motor processes, a sedative action and a decrease in dopamine release in the striatum. These changes due to a narcotic effect of nitrogen have been attributed to a decrease in glutamatergic control and the facilitation of GABAergic neurotransmission involving NMDA and GABA(A) receptors, respectively. After repeated exposure to nitrogen narcosis, a second exposure to 3 MPa increased dopamine levels suggesting a change in the control of the dopaminergic pathway. We investigated the role of the nigral NMDA and GABA(A) receptors in changes in the striatal dopamine levels. Dopamine-sensitive electrodes were implanted into the striatum under general anesthesia, together with a guide-cannula for drug injections into the SNc. Dopamine level was monitored by in vivo voltammetry. The effects of NMDA/GABA(A) receptor agonists (NMDA/muscimol) and antagonists (AP7/gabazine) on dopamine levels were investigated. Rats were exposed to 3 MPa nitrogen before and after five daily exposures to 1 MPa. After these exposures to nitrogen narcosis, gabazine, NMDA and AP7 had no effect on the nitrogen-induced increase in dopamine levels. By contrast, muscimol strongly enhanced the increase in dopamine level induced by nitrogen. Our findings suggest that repeated nitrogen exposure disrupted NMDA receptor function and decreased GABAergic input by modifying GABA(A) receptor sensitivity. These findings demonstrated a change in the mechanism of action of nitrogen at pressure.
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35
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Collins MD, Kim CU, Gruner SM. High-pressure protein crystallography and NMR to explore protein conformations. Annu Rev Biophys 2011; 40:81-98. [PMID: 21275639 DOI: 10.1146/annurev-biophys-042910-155304] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
High-pressure methods for solving protein structures by X-ray crystallography and NMR are maturing. These techniques are beginning to impact our understanding of thermodynamic and structural features that define not only the protein's native conformation, but also the higher free energy conformations. The ability of high-pressure methods to visualize these mostly unexplored conformations provides new insight into protein function and dynamics. In this review, we begin with a historical discussion of high-pressure structural studies, with an eye toward early results that paved the way to mapping the multiple conformations of proteins. This is followed by an examination of several recent studies that emphasize different strengths and uses of high-pressure structural studies, ranging from basic thermodynamics to the suggestion of high-pressure structural methods as a tool for protein engineering.
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Affiliation(s)
- Marcus D Collins
- Department of Physiology and Biophysics, University of Washington, Seattle, WA 98195-7290, USA
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36
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Rosenbaum E, Gabel F, Durá MA, Finet S, Cléry-Barraud C, Masson P, Franzetti B. Effects of hydrostatic pressure on the quaternary structure and enzymatic activity of a large peptidase complex from Pyrococcus horikoshii. Arch Biochem Biophys 2011; 517:104-10. [PMID: 21896270 DOI: 10.1016/j.abb.2011.07.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Accepted: 07/31/2011] [Indexed: 10/17/2022]
Abstract
While molecular adaptation to high temperature has been extensively studied, the effect of hydrostatic pressure on protein structure and enzymatic activity is still poorly understood. We have studied the influence of pressure on both the quaternary structure and enzymatic activity of the dodecameric TET3 peptidase from Pyrococcus horikoshii. Small angle X-ray scattering (SAXS) revealed a high robustness of the oligomer under high pressure of up to 300 MPa at 25°C as well as at 90°C. The enzymatic activity of TET3 was enhanced by pressure up to 180 MPa. From the pressure behavior of the different rate-constants we have determined the volume changes associated with substrate binding and catalysis. Based on these results we propose that a change in the rate-limiting step occurs around 180 MPa.
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Affiliation(s)
- Eva Rosenbaum
- Group Extremophiles and Large Molecular Assemblies (ELMA), CEA, Institut de Biologie Structurale, Grenoble, France
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37
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Hamdane D, Argentini M, Cornu D, Myllykallio H, Skouloubris S, Hui-Bon-Hoa G, Golinelli-Pimpaneau B. Insights into folate/FAD-dependent tRNA methyltransferase mechanism: role of two highly conserved cysteines in catalysis. J Biol Chem 2011; 286:36268-80. [PMID: 21846722 DOI: 10.1074/jbc.m111.256966] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The flavoprotein TrmFO methylates specifically the C5 carbon of the highly conserved uridine 54 in tRNAs. Contrary to most methyltransferases, the 1-carbon unit transferred by TrmFO derives from 5,10-methylenetetrahydrofolate and not from S-adenosyl-L-methionine. The enzyme also employs the FAD hydroquinone as a reducing agent of the C5 methylene U54-tRNA intermediate in vitro. By analogy with the catalytic mechanism of thymidylate synthase ThyA, a conserved cysteine located near the FAD isoalloxazine ring was proposed to act as a nucleophile during catalysis. Here, we mutated this residue (Cys-53 in Bacillus subtilis TrmFO) to alanine and investigated its functional role. Biophysical characterization of this variant demonstrated the major structural role of Cys-53 in maintaining both the integrity and plasticity of the flavin binding site. Unexpectedly, gel mobility shift assays showed that, like the wild-type enzyme, the inactive C53A variant was capable of forming a covalent complex with a 5-fluorouridine-containing mini-RNA. This result confirms the existence of a covalent intermediate during catalysis but rules out a nucleophilic role for Cys-53. To identify the actual nucleophile, two other strictly conserved cysteines (Cys-192 and Cys-226) that are relatively far from the active site were replaced with alanine, and a double mutant C53A/C226A was generated. Interestingly, only mutations that target Cys-226 impeded TrmFO from forming a covalent complex and methylating tRNA. Altogether, we propose a revised mechanism for the m(5)U54 modification catalyzed by TrmFO, where Cys-226 attacks the C6 atom of the uridine, and Cys-53 plays the role of the general base abstracting the C5 proton.
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Affiliation(s)
- Djemel Hamdane
- Laboratoire d'Enzymologie et Biochimie Structurales, Centre de Recherche de Gif, CNRS, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette, France.
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Lazareno-Saez C, Brooks CL, Lemieux MJ. Structural comparison of substrate entry gate for rhomboid intramembrane peptidases. Biochem Cell Biol 2011; 89:216-23. [PMID: 21455272 DOI: 10.1139/o10-161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Rhomboids are intramembrane serine peptidases conserved in all kingdoms of life. Their general role is to cleave integral membrane proteins to release signalling molecules. These signals, when disrupted, can contribute to various diseases. Crystal structures of H. influenzae (hiGlpG) and E. coli GlpG (ecGlpG) rhomboids have revealed a structure with six transmembrane helices and a Ser-His catalytic dyad buried within the membrane. One emerging issue was the identification of the mobile element in the protein that allows substrate docking. It has been proposed that the substrate entry gate is composed of helix 5 and loop 5. The present review studies the structures of these two orthologs. In ecGlpG structures, different conformations of loop 5 and helix 5 are observed. Open and closed conformations of ecGlpG structures are compared with each other and with hiGlpG, surveying differences in hydrophobic interactions within loop 5 and helix 5. Furthermore, a comparison of the ecGlpG and hiGlpG structures reveals differences in loop 4. Overall, less variation is observed in loop 4, suggesting this region acts as an anchor for the substrate gate. Functional and regulatory implications of these variations are discussed.
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Affiliation(s)
- Christelle Lazareno-Saez
- School of Molecular & Systems Medicine, Faculty of Medicine & Dentistry, Membrane Protein Research Group, Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada
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Gabison L, Chopard C, Colloc'h N, Peyrot F, Castro B, Hajji ME, Altarsha M, Monard G, Chiadmi M, Prangé T. X-ray, ESR, and quantum mechanics studies unravel a spin well in the cofactor-less urate oxidase. Proteins 2011; 79:1964-76. [DOI: 10.1002/prot.23022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 02/09/2011] [Accepted: 02/11/2011] [Indexed: 11/11/2022]
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Marassio G, Prangé T, David HN, Santos JSDO, Gabison L, Delcroix N, Abraini JH, Colloc'h N. Pressure-response analysis of anesthetic gases xenon and nitrous oxide on urate oxidase: a crystallographic study. FASEB J 2011; 25:2266-75. [PMID: 21421845 DOI: 10.1096/fj.11-183046] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The remarkably safe anesthetics xenon (Xe) and, to lesser extent, nitrous oxide (N(2)O) possess neuroprotective properties in preclinical studies. To investigate the mechanisms of pharmacological action of these gases, which are still poorly known, we performed both crystallography under a large range of gas pressure and biochemical studies on urate oxidase, a prototype of globular gas-binding proteins whose activity is modulated by inert gases. We show that Xe and N(2)O bind to, compete for, and expand the volume of a hydrophobic cavity located just behind the active site of urate oxidase and further inhibit urate oxidase enzymatic activity. By demonstrating a significant relationship between the binding and biochemical effects of Xe and N(2)O, given alone or in combination, these data from structure to function highlight the mechanisms by which chemically and metabolically inert gases can alter protein function and produce their pharmacological effects. Interestingly, the effects of a Xe:N(2)O equimolar mixture were found to be equivalent to those of Xe alone, thereby suggesting that gas mixtures containing Xe and N(2)O could be an alternative and efficient neuroprotective strategy to Xe alone, whose widespread clinical use is limited due to the cost of production and availability of this gas.
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Affiliation(s)
- Guillaume Marassio
- Equipe de Recherche Technologique Interne (ERTi) 1083, Centre National de la Recherche Scientifique (CNRS), Centre Cyceron, Caen, France
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Fourme R, Girard E, Dhaussy AC, Medjoubi K, Prangé T, Ascone I, Mezouar M, Kahn R. A new paradigm for macromolecular crystallography beamlines derived from high-pressure methodology and results. JOURNAL OF SYNCHROTRON RADIATION 2011; 18:31-6. [PMID: 21169687 PMCID: PMC3004250 DOI: 10.1107/s0909049510041695] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 10/15/2010] [Indexed: 05/16/2023]
Abstract
Biological structures can now be investigated at high resolution by high-pressure X-ray macromolecular crystallography (HPMX). The number of HPMX studies is growing, with applications to polynucleotides, monomeric and multimeric proteins, complex assemblies and even a virus capsid. Investigations of the effects of pressure perturbation have encompassed elastic compression of the native state, study of proteins from extremophiles and trapping of higher-energy conformers that are often of biological interest; measurements of the compressibility of crystals and macromolecules were also performed. HPMX results were an incentive to investigate short and ultra-short wavelengths for standard biocrystallography. On cryocooled lysozyme crystals it was found that the data collection efficiency using 33 keV photons is increased with respect to 18 keV photons. This conclusion was extended from 33 keV down to 6.5 keV by exploiting previously published data. To be fully exploited, the potential of higher-energy photons requires detectors with a good efficiency. Accordingly, a new paradigm for MX beamlines was suggested, using conventional short and ultra-short wavelengths, aiming at the collection of very high accuracy data on crystals under standard conditions or under high pressure. The main elements of such beamlines are outlined.
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Affiliation(s)
- Roger Fourme
- Synchrotron SOLEIL, BP 48, Saint Aubin, 91192 Gif-sur-Yvette, France.
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Coquelle N, Talon R, Juers DH, Girard É, Kahn R, Madern D. Gradual Adaptive Changes of a Protein Facing High Salt Concentrations. J Mol Biol 2010; 404:493-505. [DOI: 10.1016/j.jmb.2010.09.055] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 09/22/2010] [Accepted: 09/24/2010] [Indexed: 11/26/2022]
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Cioni P, Gabellieri E. Protein dynamics and pressure: what can high pressure tell us about protein structural flexibility? BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1814:934-41. [PMID: 20934540 DOI: 10.1016/j.bbapap.2010.09.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 09/22/2010] [Accepted: 09/30/2010] [Indexed: 11/25/2022]
Abstract
After a brief overview of NMR and X-ray crystallography studies on protein flexibility under pressure, we summarize the effects of hydrostatic pressure on the native fold of azurin from Pseudomonas aeruginosa as inferred from the variation of the intrinsic phosphorescence lifetime and the acrylamide bimolecular quenching rate constants of the buried Trp residue. The pressure/temperature response of the globular fold and modulation of its dynamical structure is analyzed both in terms of a reduction of internal cavities and of the hydration of the polypeptide. The study of the effect of two single point cavity forming mutations, F110S and I7S, on the unfolding volume change (ΔV(0)) of azurin and on the internal dynamics of the protein fold under pressure demonstrate that the creation of an internal cavity will enhance the plasticity and lower the stability of the globular structure. This article is part of a Special Issue entitled: Protein Dynamics: Experimental and Computational Approaches.
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Affiliation(s)
- Patrizia Cioni
- Istituto di Biofisica, Consiglio Nazionale delle Ricerche, Area della Ricerca di Pisa, Via Moruzzi 1, 56100-Pisa, Italy.
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