1
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Tarasca MV, Naser D, Schaefer A, Soule TG, Meiering EM. Quenched hydrogen-deuterium amide exchange optimization for high-resolution structural analysis of cellular protein aggregates. Anal Biochem 2022; 652:114675. [PMID: 35390328 DOI: 10.1016/j.ab.2022.114675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 03/23/2022] [Accepted: 03/24/2022] [Indexed: 12/17/2022]
Abstract
Inclusion bodies (IBs) are large, insoluble aggregates that often form during the overexpression of proteins in bacteria. These aggregates are of broad fundamental and practical significance, for recombinant protein preparation and due to their relevance to aggregation-related medical conditions and their recent emergence as promising functional nanomaterials. Despite their significance, high resolution knowledge of IB structure remains very limited. Such knowledge will advance understanding and control of IB formation and properties in myriad practical applications. Here, we report a detailed quenched hydrogen-deuterium amide exchange (qHDX) method with NMR readout to define the structure of IBs at the level of individual residues throughout the protein. Applying proper control of experimental conditions, such as sample pH, water content, temperature, and intrinsic rate of amide exchange, yields in depth results for these cellular protein aggregates. qHDX results illustrated for Cu, Zn superoxide dismutase 1 (SOD1) and Adnectins show their IBs include native-like structure and some but not all mutations alter IB structure.
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Affiliation(s)
| | - Dalia Naser
- Department of Chemistry, University of Waterloo, Waterloo, Canada
| | - Anna Schaefer
- Department of Chemistry, University of Waterloo, Waterloo, Canada
| | - Tyler Gb Soule
- Department of Chemistry, University of Waterloo, Waterloo, Canada
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2
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Schaefer A, Naser D, Siebeneichler B, Tarasca MV, Meiering EM. Methodological advances and strategies for high resolution structure determination of cellular protein aggregates. J Biol Chem 2022; 298:102197. [PMID: 35760099 PMCID: PMC9396402 DOI: 10.1016/j.jbc.2022.102197] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 01/14/2023] Open
Abstract
Aggregation of proteins is at the nexus of molecular processes crucial to aging, disease, and employing proteins for biotechnology and medical applications. There has been much recent progress in determining the structural features of protein aggregates that form in cells; yet, owing to prevalent heterogeneity in aggregation, many aspects remain obscure and often experimentally intractable to define. Here, we review recent results of structural studies for cell-derived aggregates of normally globular proteins, with a focus on high-resolution methods for their analysis and prediction. Complementary results obtained by solid-state NMR spectroscopy, FTIR spectroscopy and microspectroscopy, cryo-EM, and amide hydrogen/deuterium exchange measured by NMR and mass spectrometry, applied to bacterial inclusion bodies and disease inclusions, are uncovering novel information on in-cell aggregation patterns as well as great diversity in the structural features of useful and aberrant protein aggregates. Using these advances as a guide, this review aims to advise the reader on which combination of approaches may be the most appropriate to apply to their unique system.
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Affiliation(s)
- Anna Schaefer
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
| | - Dalia Naser
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
| | | | - Michael V Tarasca
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
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3
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Martin RW, Kelly JE, Kelz JI. Advances in instrumentation and methodology for solid-state NMR of biological assemblies. J Struct Biol 2018; 206:73-89. [PMID: 30205196 DOI: 10.1016/j.jsb.2018.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 07/08/2018] [Accepted: 09/06/2018] [Indexed: 01/11/2023]
Abstract
Many advances in instrumentation and methodology have furthered the use of solid-state NMR as a technique for determining the structures and studying the dynamics of molecules involved in complex biological assemblies. Solid-state NMR does not require large crystals, has no inherent size limit, and with appropriate isotopic labeling schemes, supports solving one component of a complex assembly at a time. It is complementary to cryo-EM, in that it provides local, atomic-level detail that can be modeled into larger-scale structures. This review focuses on the development of high-field MAS instrumentation and methodology; including probe design, benchmarking strategies, labeling schemes, and experiments that enable the use of quadrupolar nuclei in biomolecular NMR. Current challenges facing solid-state NMR of biological assemblies and new directions in this dynamic research area are also discussed.
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Affiliation(s)
- Rachel W Martin
- Department of Chemistry, University of California, Irvine 92697-2025, United States; Department of Molecular Biology and Biochemistry, University of California, Irvine 92697-3900, United States.
| | - John E Kelly
- Department of Chemistry, University of California, Irvine 92697-2025, United States
| | - Jessica I Kelz
- Department of Chemistry, University of California, Irvine 92697-2025, United States
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4
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Sengupta I, Udgaonkar JB. Structural mechanisms of oligomer and amyloid fibril formation by the prion protein. Chem Commun (Camb) 2018; 54:6230-6242. [PMID: 29789820 DOI: 10.1039/c8cc03053g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Misfolding and aggregation of the prion protein is responsible for multiple neurodegenerative diseases. Works from several laboratories on folding of both the WT and multiple pathogenic mutant variants of the prion protein have identified several structurally dissimilar intermediates, which might be potential precursors to misfolding and aggregation. The misfolded aggregates themselves are morphologically distinct, critically dependent on the solution conditions under which they are prepared, but always β-sheet rich. Despite the lack of an atomic resolution structure of the infectious pathogenic agent in prion diseases, several low resolution models have identified the β-sheet rich core of the aggregates formed in vitro, to lie in the α2-α3 subdomain of the prion protein, albeit with local stabilities that vary with the type of aggregate. This feature article describes recent advances in the investigation of in vitro prion protein aggregation using multiple spectroscopic probes, with particular focus on (1) identifying aggregation-prone conformations of the monomeric protein, (2) conditions which trigger misfolding and oligomerization, (3) the mechanism of misfolding and aggregation, and (4) the structure of the misfolded intermediates and final aggregates.
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Affiliation(s)
- Ishita Sengupta
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru 560065, India
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5
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Aucoin D, Xia Y, Theint T, Nadaud PS, Surewicz K, Surewicz WK, Jaroniec CP. Protein-solvent interfaces in human Y145Stop prion protein amyloid fibrils probed by paramagnetic solid-state NMR spectroscopy. J Struct Biol 2018; 206:36-42. [PMID: 29679649 DOI: 10.1016/j.jsb.2018.04.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 03/24/2018] [Accepted: 04/13/2018] [Indexed: 11/16/2022]
Abstract
The C-terminally truncated Y145Stop variant of prion protein (PrP23-144), which is associated with heritable PrP cerebral amyloid angiopathy in humans and also capable of triggering a transmissible prion disease in mice, serves as a useful in vitro model for investigating the molecular and structural basis of amyloid strains and cross-seeding specificities. Here, we determine the protein-solvent interfaces in human PrP23-144 amyloid fibrils generated from recombinant 13C,15N-enriched protein and incubated in aqueous solution containing paramagnetic Cu(II)-EDTA, by measuring residue-specific 15N longitudinal paramagnetic relaxation enhancements using two-dimensional magic-angle spinning solid-state NMR spectroscopy. To further probe the interactions of the amyloid core residues with solvent molecules we perform complementary measurements of amide hydrogen/deuterium exchange detected by solid-state NMR and solution NMR methods. The solvent accessibility data are evaluated in the context of the structural model for human PrP23-144 amyloid.
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Affiliation(s)
- Darryl Aucoin
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Yongjie Xia
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Theint Theint
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Philippe S Nadaud
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Krystyna Surewicz
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Witold K Surewicz
- Department of Physiology and Biophysics, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Christopher P Jaroniec
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA.
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6
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Ishibashi D, Nakagaki T, Ishikawa T, Atarashi R, Watanabe K, Cruz FA, Hamada T, Nishida N. Structure-Based Drug Discovery for Prion Disease Using a Novel Binding Simulation. EBioMedicine 2016; 9:238-249. [PMID: 27333028 PMCID: PMC4972544 DOI: 10.1016/j.ebiom.2016.06.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 05/25/2016] [Accepted: 06/06/2016] [Indexed: 12/22/2022] Open
Abstract
The accumulation of abnormal prion protein (PrP(Sc)) converted from the normal cellular isoform of PrP (PrP(C)) is assumed to induce pathogenesis in prion diseases. Therefore, drug discovery studies for these diseases have focused on the protein conversion process. We used a structure-based drug discovery algorithm (termed Nagasaki University Docking Engine: NUDE) that ran on an intensive supercomputer with a graphic-processing unit to identify several compounds with anti-prion effects. Among the candidates showing a high-binding score, the compounds exhibited direct interaction with recombinant PrP in vitro, and drastically reduced PrP(Sc) and protein-aggresomes in the prion-infected cells. The fragment molecular orbital calculation showed that the van der Waals interaction played a key role in PrP(C) binding as the intermolecular interaction mode. Furthermore, PrP(Sc) accumulation and microgliosis were significantly reduced in the brains of treated mice, suggesting that the drug candidates provided protection from prion disease, although further in vivo tests are needed to confirm these findings. This NUDE-based structure-based drug discovery for normal protein structures is likely useful for the development of drugs to treat other conformational disorders, such as Alzheimer's disease.
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Affiliation(s)
- Daisuke Ishibashi
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, Japan.
| | - Takehiro Nakagaki
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, Japan
| | - Takeshi Ishikawa
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, Japan
| | - Ryuichiro Atarashi
- Division of Microbiology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, Japan
| | - Ken Watanabe
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, Japan
| | - Felipe A Cruz
- Nagasaki Advanced Computing Center, Nagasaki University, Japan
| | - Tsuyoshi Hamada
- Nagasaki Advanced Computing Center, Nagasaki University, Japan
| | - Noriyuki Nishida
- Department of Molecular Microbiology and Immunology, Graduate School of Biomedical Sciences, Nagasaki University, Japan
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Abstract
Amyloid fibrils are associated with a number of human diseases. These aggregatively misfolded intermolecular β-sheet assemblies constitute some of the most challenging targets in structural biology because to their complexity, size, and insolubility. Here, protocols and controls are described for experiments designed to study hydrogen-bonding in amyloid fibrils indirectly, by transferring information about amide proton occupancy in the fibrils to the dimethyl sulfoxide-denatured state. Since the denatured state is amenable to solution NMR spectroscopy, the method can provide residue-level-resolution data on hydrogen exchange for the monomers that make up the fibrils.
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Affiliation(s)
- Andrei T Alexandrescu
- Department of Molecular and Cell Biology, University of Connecticut, Unit 3125, BSP 209, 91 N. Eagleville Rd., Storrs, CT, 06269-3125, USA.
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Abstract
Mass spectrometry is an analytical technique that measures the mass-to-charge ratio of charged particles. Nowadays mass spectrometry-based approaches play a pivotal role in both detection and characterization of proteins. Here we describe two applications to study insoluble proteins: (a) hydrogen/deuterium exchange combined with mass spectrometry to analyze structural properties of amyloid fibrils and (b) the screening for inhibitors of the aggregation process by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.
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Affiliation(s)
- Sílvia Bronsoms
- Servei de Proteòmica i Biologia Estructural, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193, Barcelona, Spain,
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French KC, Roan NR, Makhatadze GI. Structural characterization of semen coagulum-derived SEM1(86-107) amyloid fibrils that enhance HIV-1 infection. Biochemistry 2014; 53:3267-77. [PMID: 24811874 PMCID: PMC4039337 DOI: 10.1021/bi500427r] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
![]()
SEM1(86–107)
is a 22-residue peptide corresponding to residues
86–107 in the semenogelin I protein. SEM1(86–107) is
an abundant component of freshly liquefied semen and forms amyloid
fibrils capable of enhancing HIV infection. To probe the factors affecting
fibril formation and gain a better understanding of how differences
in pH between semen and vaginal fluid affect fibril stability, this
study determined the effect of pH on SEM1(86–107) fibril formation
and dissociation. The SEM1(86–107) fibril structure (i.e.,
residues that comprise the fibrillar core) was also probed using hydrogen–deuterium
exchange mass spectrometry (HDXMS) and hydroxyl radical-mediated protein
modification. The average percent exposure to hydroxyl radical-mediated
modification in the SEM1(86–107) fibrils was determined without
requiring tandem mass spectrometry spectral acquisition or complete
separation of modified peptides. It was found that the residue exposures
calculated from HDXMS and hydroxyl radical-mediated modification were
similar. These techniques demonstrated that three regions of SEM1(86–107)
comprise the amyloid fibril core and that positively charged residues
are exposed, suggesting that electrostatic interactions between SEM1(86–107)
and HIV or the cell surface may be responsible for mediating HIV infection
enhancement by the SEM1(86–107) fibrils.
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Affiliation(s)
- Kinsley C French
- Department of Biological Sciences and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute , Troy, New York 12180, United States
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10
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Singh J, Udgaonkar JB. Dissection of Conformational Conversion Events during Prion Amyloid Fibril Formation Using Hydrogen Exchange and Mass Spectrometry. J Mol Biol 2013; 425:3510-21. [DOI: 10.1016/j.jmb.2013.06.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 06/10/2013] [Accepted: 06/12/2013] [Indexed: 10/26/2022]
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11
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Lemaire P, Debois D, Smargiasso N, Quinton L, Gabelica V, De Pauw EA. Use of 1,5-diaminonaphthalene to combine matrix-assisted laser desorption/ionization in-source decay fragmentation with hydrogen/deuterium exchange. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2013; 27:1837-1846. [PMID: 23857929 DOI: 10.1002/rcm.6627] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 04/12/2013] [Accepted: 05/13/2013] [Indexed: 06/02/2023]
Abstract
RATIONALE In-Source Decay (ISD) in Matrix-Assisted Laser Desorption/Ionization (MALDI) mass spectrometry is a fast and easy top-down activation method. Our objective is to find a suitable matrix to locate the deuterons following in-solution hydrogen/deuterium exchange (HDX). This matrix must circumvent the commonly encountered undesired back-exchange reactions, in order to preserve the regioselective deuteration pattern. METHODS The 1,5-diaminonaphthalene (1,5-DAN) matrix is known to be suitable for MALDI-ISD fragmentation. MALDI Mass Spectrometry Imaging (MSI) was employed to compare 1,5-DAN and other commonly used MALDI matrices with respect to the extent of back-exchange and the uniformity of the H/D exchange profiles within the MALDI spots. We tested the back-exchange on the highly sensitive amyloid-beta peptide (1-40), and proved the regioselectivity on ubiquitin and β-endorphin. RESULTS MALDI-MSI results show that 1,5-DAN leads to the least back-exchange over all the spot. MALDI-ISD fragmentation combined with H/D exchange using 1,5-DAN matrix was validated by localizing deuterons in native ubiquitin. Results agree with previous data obtained by Nuclear Magnetic Resonance (NMR) and Electron Transfer Dissociation (ETD). Moreover, 1,5-DAN matrix was used to study the H/D exchange profile of the methanol-induced helical structure of β-endorphin, and the relative protection can be explained by the polarity of residues involved in hydrogen bond formation. CONCLUSIONS We found that controlling crystallization is the most important parameter when combining H/D exchange with MALDI. The 1,5-DAN matrix is characterized by a fast crystallization kinetics, and therefore gives robust and reliable H/D exchange profiles using MALDI-ISD.
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Affiliation(s)
- Pascale Lemaire
- GIGA-R, Mass Spectrometry Laboratory, Department of Chemistry, Chemistry Building B6c, University of Liège, B-4000 Liège, Belgium
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12
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Balasubramaniam D, Komives EA. Hydrogen-exchange mass spectrometry for the study of intrinsic disorder in proteins. BIOCHIMICA ET BIOPHYSICA ACTA 2013; 1834:1202-9. [PMID: 23099262 PMCID: PMC3600394 DOI: 10.1016/j.bbapap.2012.10.009] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 10/11/2012] [Accepted: 10/15/2012] [Indexed: 12/14/2022]
Abstract
Amide hydrogen/deuterium exchange detected by mass spectrometry (HXMS) is seeing wider use for the identification of intrinsically disordered parts of proteins. In this review, we discuss examples of how discovery of intrinsically disordered regions and their removal can aid in structure determination, biopharmaceutical quality control, the characterization of how post-translational modifications affect weak structuring of disordered regions, the study of coupled folding and binding, and the characterization of amyloid formation. This article is part of a Special Issue entitled: Mass spectrometry in structural biology.
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Affiliation(s)
- Deepa Balasubramaniam
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0378
| | - Elizabeth A. Komives
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0378
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13
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Alexandrescu AT. Amide proton solvent protection in amylin fibrils probed by quenched hydrogen exchange NMR. PLoS One 2013; 8:e56467. [PMID: 23457571 PMCID: PMC3574092 DOI: 10.1371/journal.pone.0056467] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Accepted: 01/11/2013] [Indexed: 11/24/2022] Open
Abstract
Amylin is an endocrine hormone that accumulates in amyloid plaques in patients with advanced type 2 diabetes. The amyloid plaques have been implicated in the destruction of pancreatic β-cells, which synthesize amylin and insulin. To better characterize the secondary structure of amylin in amyloid fibrils we assigned the NMR spectrum of the unfolded state in 95% DMSO and used a quenched hydrogen-deuterium exchange technique to look at amide proton solvent protection in the fibrils. In this technique, partially exchanged fibrils are dissolved in 95% DMSO and information about amide proton occupancy in the fibrils is determined from DMSO-denatured monomers. Hydrogen exchange lifetimes at pH 7.6 and 37°C vary between ∼5 h for the unstructured N-terminus to 600 h for amide protons in the two β-strands that form inter-molecular hydrogen bonds between amylin monomers along the length of the fibril. Based on the protection data we conclude that residues A8-H18 and I26-Y37 comprise the two β-strands in amylin fibrils. There is variation in protection within the β-strands, particularly for strand β1 where only residues F15-H18 are strongly protected. Differences in protection appear to be due to restrictions on backbone dynamics imposed by the packing of two-layers of C2-symmetry-related β-hairpins in the protofilament structure, with strand β1 positioned on the surface and β2 in the interior.
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Affiliation(s)
- Andrei T Alexandrescu
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, United States of America.
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14
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French KC, Makhatadze GI. Core sequence of PAPf39 amyloid fibrils and mechanism of pH-dependent fibril formation: the role of monomer conformation. Biochemistry 2012; 51:10127-36. [PMID: 23215256 DOI: 10.1021/bi301406d] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PAPf39, a 39-residue peptide fragment from human prostatic acidic phosphatase, has been shown to form amyloid fibrils in semen (SEVI), which increase HIV infectivity by up to 5 orders of magnitude. The sequence of the PAPf39 fibrillar core was identified using hydrogen-deuterium exchange (HDX) mass spectrometry and protease protection assays. The central and C-terminal regions are highly protected from HDX and proteolytic cleavage and, thus, are part of the fibrillar core. Conversely, the N-terminal region is unprotected from HDX and proteolytic cleavage, suggesting that it is exposed and not part of the fibrillar core. This finding was tested using two N-terminal truncated variants, PAPf39Δ1-8 and PAPf39Δ1-13. Both variants formed amyloid fibrils at neutral pH. However, these variants showed a markedly different pH dependence of fibril formation versus that of PAPf39. PAPf39 fibrils can form at pH 7.7, but not at pH 5.5 or 2.5, while both N-terminally truncated variants can form fibrils at these pH values. Thus, the N-terminal region is not necessary for fibril formation but modulates the pH dependence of PAPf39 fibril formation. PAPf39Δ1-8 and PAPf39Δ1-13 are capable of seeding PAPf39 fibril formation at neutral pH, suggesting that these variants are structurally compatible with PAPf39, yet no mixed fibril formation occurs between the truncated variants and PAPf39 at low pH. This suggests that pH affects the PAPf39 monomer conformational ensemble, which is supported by far-UV circular dichroism spectroscopy. A conceptual model describing the pH dependence of PAPf39 aggregation is proposed and provides potential biological implications.
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Affiliation(s)
- Kinsley C French
- Department of Biology and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA
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15
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Skora L, Fonseca-Ornelas L, Hofele RV, Riedel D, Giller K, Watzlawik J, Schulz-Schaeffer WJ, Urlaub H, Becker S, Zweckstetter M. Burial of the polymorphic residue 129 in amyloid fibrils of prion stop mutants. J Biol Chem 2012; 288:2994-3002. [PMID: 23209282 DOI: 10.1074/jbc.m112.423715] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Misfolding of the natively α-helical prion protein into a β-sheet rich isoform is related to various human diseases such as Creutzfeldt-Jakob disease and Gerstmann-Sträussler-Scheinker syndrome. In humans, the disease phenotype is modified by a methionine/valine polymorphism at codon 129 of the prion protein gene. Using a combination of hydrogen/deuterium exchange coupled to NMR spectroscopy, hydroxyl radical probing detected by mass spectrometry, and site-directed mutagenesis, we demonstrate that stop mutants of the human prion protein have a conserved amyloid core. The 129 residue is deeply buried in the amyloid core structure, and its mutation strongly impacts aggregation. Taken together the data support a critical role of the polymorphic residue 129 of the human prion protein in aggregation and disease.
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Affiliation(s)
- Lukasz Skora
- Max Planck Institute for Biophysical Chemistry, 37077 Göttingen, Germany
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16
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Lee YH, Goto Y. Kinetic intermediates of amyloid fibrillation studied by hydrogen exchange methods with nuclear magnetic resonance. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:1307-23. [DOI: 10.1016/j.bbapap.2012.07.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 07/24/2012] [Accepted: 07/26/2012] [Indexed: 01/28/2023]
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17
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Skora L, Zweckstetter M. Determination of amyloid core structure using chemical shifts. Protein Sci 2012; 21:1948-53. [PMID: 23033250 DOI: 10.1002/pro.2170] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 09/24/2012] [Accepted: 09/25/2012] [Indexed: 12/18/2022]
Abstract
Amyloid fibrils are the pathological hallmark of a large variety of neurodegenerative disorders. The structural characterization of amyloid fibrils, however, is challenging due to their non-crystalline, heterogeneous, and often dynamic nature. Thus, the structure of amyloid fibrils of many proteins is still unknown. We here show that the structure calculation program CS-Rosetta can be used to obtain insight into the core structure of amyloid fibrils. Driven by experimental solid-state NMR chemical shifts and taking into account the polymeric nature of fibrils CS-Rosetta allows modeling of the core of amyloid fibrils. Application to the Y145X stop mutant of the human prion protein reveals a left-handed β-helix.
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Affiliation(s)
- Lukasz Skora
- Max Planck Institute for Biophysical Chemistry, Am Faßberg 11, Göttingen, Germany
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18
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Cong X, Bongarzone S, Giachin G, Rossetti G, Carloni P, Legname G. Dominant-negative effects in prion diseases: insights from molecular dynamics simulations on mouse prion protein chimeras. J Biomol Struct Dyn 2012; 31:829-40. [PMID: 22934595 DOI: 10.1080/07391102.2012.712477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Mutations in the prion protein (PrP) can cause spontaneous prion diseases in humans (Hu) and animals. In transgenic mice, mutations can determine the susceptibility to the infection of different prion strains. Some of these mutations also show a dominant-negative effect, thus halting the replication process by which wild type mouse (Mo) PrP is converted into Mo scrapie. Using all-atom molecular dynamics (MD) simulations, here we studied the structure of HuPrP, MoPrP, 10 Hu/MoPrP chimeras, and 1 Mo/sheepPrP chimera in explicit solvent. Overall, ∼2 μs of MD were collected. Our findings suggest that the interactions between α1 helix and N-terminal of α3 helix are critical in prion propagation, whereas the β2-α2 loop conformation plays a role in the dominant-negative effect. An animated Interactive 3D Complement (I3DC) is available in Proteopedia at http://proteopedia.org/w/Journal:JBSD:4 .
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Affiliation(s)
- Xiaojing Cong
- Department of Physics, Scuola Internazionale Superiore di Studi Avanzati-SISSA, Via Bonomea 265, 34136 Trieste, Italy
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Brock A. Fragmentation hydrogen exchange mass spectrometry: A review of methodology and applications. Protein Expr Purif 2012; 84:19-37. [DOI: 10.1016/j.pep.2012.04.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Accepted: 04/13/2012] [Indexed: 01/19/2023]
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Zanetti Polzi L, Amadei A, Aschi M, Daidone I. New Insight into the IR-Spectra/Structure Relationship in Amyloid Fibrils: A Theoretical Study on a Prion Peptide. J Am Chem Soc 2011; 133:11414-7. [DOI: 10.1021/ja2028662] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Laura Zanetti Polzi
- Department of Chemistry, University of Rome “La Sapienza”, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Andrea Amadei
- Department of Chemical Sciences and Technologies, University of Rome “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Massimiliano Aschi
- Department of Chemistry, Chemical Engineering and Materials, University of L’Aquila, Via Vetoio (Coppito 1), 67010 L’Aquila, Italy
| | - Isabella Daidone
- Department of Chemistry, Chemical Engineering and Materials, University of L’Aquila, Via Vetoio (Coppito 1), 67010 L’Aquila, Italy
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