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Častorálová M, Sýs J, Prchal J, Pavlů A, Prokopová L, Briki Z, Hubálek M, Ruml T. A myristoyl switch at the plasma membrane triggers cleavage and oligomerization of Mason-Pfizer monkey virus matrix protein. eLife 2024; 13:e93489. [PMID: 38517277 PMCID: PMC11014724 DOI: 10.7554/elife.93489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 03/10/2024] [Indexed: 03/23/2024] Open
Abstract
For most retroviruses, including HIV, association with the plasma membrane (PM) promotes the assembly of immature particles, which occurs simultaneously with budding and maturation. In these viruses, maturation is initiated by oligomerization of polyprotein precursors. In contrast, several retroviruses, such as Mason-Pfizer monkey virus (M-PMV), assemble in the cytoplasm into immature particles that are transported across the PM. Therefore, protease activation and specific cleavage must not occur until the pre-assembled particle interacts with the PM. This interaction is triggered by a bipartite signal consisting of a cluster of basic residues in the matrix (MA) domain of Gag polyprotein and a myristoyl moiety N-terminally attached to MA. Here, we provide evidence that myristoyl exposure from the MA core and its insertion into the PM occurs in M-PMV. By a combination of experimental methods, we show that this results in a structural change at the C-terminus of MA allowing efficient cleavage of MA from the downstream region of Gag. This suggests that, in addition to the known effect of the myristoyl switch of HIV-1 MA on the multimerization state of Gag and particle assembly, the myristoyl switch may have a regulatory role in initiating sequential cleavage of M-PMV Gag in immature particles.
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Affiliation(s)
- Markéta Častorálová
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
| | - Jakub Sýs
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
- Institute of Organic Chemistry and Biochemistry of Czech Academy of SciencePragueCzech Republic
| | - Jan Prchal
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
| | - Anna Pavlů
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
| | - Lucie Prokopová
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
| | - Zina Briki
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
| | - Martin Hubálek
- Institute of Organic Chemistry and Biochemistry of Czech Academy of SciencePragueCzech Republic
| | - Tomas Ruml
- Department of Biochemistry and Microbiology, University of Chemistry and TechnologyPragueCzech Republic
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Interaction Interface of Mason-Pfizer Monkey Virus Matrix and Envelope Proteins. J Virol 2020; 94:JVI.01146-20. [PMID: 32796061 DOI: 10.1128/jvi.01146-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 08/03/2020] [Indexed: 02/06/2023] Open
Abstract
Retroviral envelope glycoprotein (Env) is essential for the specific recognition of the host cell and the initial phase of infection. As reported for human immunodeficiency virus (HIV), the recruitment of Env into a retroviral membrane envelope is mediated through its interaction with a Gag polyprotein precursor of structural proteins. This interaction, occurring between the matrix domain (MA) of Gag and the cytoplasmic tail (CT) of the transmembrane domain of Env, takes place at the host cell plasma membrane. To determine whether the MA of Mason-Pfizer monkey virus (M-PMV) also interacts directly with the CT of Env, we mimicked the in vivo conditions in an in vitro experiment by using a CT in its physiological trimeric conformation mediated by the trimerization motif of the GCN4 yeast transcription factor. The MA protein was used at the concentration shifting the equilibrium to its trimeric form. The direct interaction between MA and CT was confirmed by a pulldown assay. Through the combination of nuclear magnetic resonance (NMR) spectroscopy and protein cross-linking followed by mass spectrometry analysis, the residues involved in mutual interactions were determined. NMR has shown that the C terminus of the CT is bound to the C-terminal part of MA. In addition, protein cross-linking confirmed the close proximity of the N-terminal part of CT and the N terminus of MA, which is enabled in vivo by their location at the membrane. These results are in agreement with the previously determined orientation of MA on the membrane and support the already observed mechanisms of M-PMV virus-like particle transport and budding.IMPORTANCE By a combination of nuclear magnetic resonance (NMR) and mass spectroscopy of cross-linked peptides, we show that in contrast to human immunodeficiency virus type 1 (HIV-1), the C-terminal residues of the unstructured cytoplasmic tail of Mason-Pfizer monkey virus (M-PMV) Env interact with the matrix domain (MA). Based on biochemical data and molecular modeling, we propose that individual cytoplasmic tail (CT) monomers of a trimeric complex bind MA molecules belonging to different neighboring trimers, which may stabilize the MA orientation at the membrane by the formation of a membrane-bound net of interlinked Gag and CT trimers. This also corresponds with the concept that the membrane-bound MA of Gag recruits Env through interaction with the full-length CT, while CT truncation during maturation attenuates the interaction to facilitate uncoating. We propose a model suggesting different arrangements of MA-CT complexes between a D-type and C-type retroviruses with short and long CTs, respectively.
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Junková P, Pleskot R, Prchal J, Sýs J, Ruml T. Differences and commonalities in plasma membrane recruitment of the two morphogenetically distinct retroviruses HIV-1 and MMTV. J Biol Chem 2020; 295:8819-8833. [PMID: 32385109 DOI: 10.1074/jbc.ra119.011991] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 05/05/2020] [Indexed: 11/06/2022] Open
Abstract
Retroviral Gag polyproteins are targeted to the inner leaflet of the plasma membrane through their N-terminal matrix (MA) domain. Because retroviruses of different morphogenetic types assemble their immature particles in distinct regions of the host cell, the mechanism of MA-mediated plasma membrane targeting differs among distinct retroviral morphogenetic types. Here, we focused on possible mechanistic differences of the MA-mediated plasma membrane targeting of the B-type mouse mammary tumor virus (MMTV) and C-type HIV-1, which assemble in the cytoplasm and at the plasma membrane, respectively. Molecular dynamics simulations, together with surface mapping, indicated that, similarly to HIV-1, MMTV uses a myristic switch to anchor the MA to the membrane and electrostatically interacts with phosphatidylinositol 4,5-bisphosphate to stabilize MA orientation. We observed that the affinity of MMTV MA to the membrane is lower than that of HIV-1 MA, possibly related to their different topologies and the number of basic residues in the highly basic MA region. The latter probably reflects the requirement of C-type retroviruses for tighter membrane binding, essential for assembly, unlike for D/B-type retroviruses, which assemble in the cytoplasm. A comparison of the membrane topology of the HIV-1 MA, using the surface-mapping method and molecular dynamics simulations, revealed that the residues at the HIV-1 MA C terminus help stabilize protein-protein interactions within the HIV-1 MA lattice at the plasma membrane. In summary, HIV-1 and MMTV share common features such as membrane binding of the MA via hydrophobic interactions and exhibit several differences, including lower membrane affinity of MMTV MA.
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Affiliation(s)
- Petra Junková
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic; Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Roman Pleskot
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium; VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Jan Prchal
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - Jakub Sýs
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - Tomáš Ruml
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic.
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Junková P, Prchal J, Spiwok V, Pleskot R, Kadlec J, Krásný L, Hynek R, Hrabal R, Ruml T. Molecular aspects of the interaction between Mason-Pfizer monkey virus matrix protein and artificial phospholipid membrane. Proteins 2016; 84:1717-1727. [PMID: 27578150 DOI: 10.1002/prot.25156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 08/04/2016] [Accepted: 08/25/2016] [Indexed: 11/09/2022]
Abstract
The Mason-Pfizer monkey virus is a type D retrovirus, which assembles its immature particles in the cytoplasm prior to their transport to the host cell membrane. The association with the membrane is mediated by the N-terminally myristoylated matrix protein. To reveal the role of particular residues which are involved in the capsid-membrane interaction, covalent labelling of arginine, lysine and tyrosine residues of the Mason-Pfizer monkey virus matrix protein bound to artificial liposomes containing 95% of phosphatidylcholine and 5% phosphatidylinositol-(4,5)-bisphosphate (PI(4,5)P2 ) was performed. The experimental results were interpreted by multiscale molecular dynamics simulations. The application of these two complementary approaches helped us to reveal that matrix protein specifically recognizes the PI(4,5)P2 molecule by the residues K20, K25, K27, K74, and Y28, while the residues K92 and K93 stabilizes the matrix protein orientation on the membrane by the interaction with another PI(4,5)P2 molecule. Residues K33, K39, K54, Y66, Y67, and K87 appear to be involved in the matrix protein oligomerization. All arginine residues remained accessible during the interaction with liposomes which indicates that they neither contribute to the interaction with membrane nor are involved in protein oligomerization. Proteins 2016; 84:1717-1727. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- P Junková
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic.
| | - J Prchal
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - V Spiwok
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - R Pleskot
- Laboratory of Cell Biology, Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - J Kadlec
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - L Krásný
- Laboratory of molecular structure characterisation, Institute of Microbiology of the ASCR, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Department of Cancer Biology, Institute of Cancer Research, London, United Kingdom
| | - R Hynek
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - R Hrabal
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
| | - T Ruml
- Department of Biochemistry and Microbiology, University of Chemistry and Technology, Prague, Czech Republic
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Doležal M, Zábranský A, Dostál J, Vaněk O, Brynda J, Lepšík M, Hadravová R, Pichová I. Myristoylation drives dimerization of matrix protein from mouse mammary tumor virus. Retrovirology 2016; 13:2. [PMID: 26728401 PMCID: PMC4700671 DOI: 10.1186/s12977-015-0235-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Accepted: 12/22/2015] [Indexed: 11/25/2022] Open
Abstract
Background Myristoylation of the matrix (MA) domain mediates the transport and binding of Gag polyproteins to the plasma membrane (PM) and is required for the assembly of most retroviruses. In betaretroviruses, which assemble immature particles in the cytoplasm, myristoylation is dispensable for assembly but is crucial for particle transport to the PM. Oligomerization of HIV-1 MA stimulates the transition of the myristoyl group from a sequestered to an exposed conformation, which is more accessible for membrane binding. However, for other retroviruses, the effect of MA oligomerization on myristoyl group exposure has not been thoroughly investigated. Results Here, we demonstrate that MA from the betaretrovirus mouse mammary tumor virus (MMTV) forms dimers in solution and that this process is stimulated by its myristoylation. The crystal structure of N-myristoylated MMTV MA, determined at 1.57 Å resolution, revealed that the myristoyl groups are buried in a hydrophobic pocket at the dimer interface and contribute to dimer formation. Interestingly, the myristoyl groups in the dimer are mutually swapped to achieve energetically stable binding, as documented by molecular dynamics modeling. Mutations within the myristoyl binding site resulted in reduced MA dimerization and extracellular particle release. Conclusions Based on our experimental, structural, and computational data, we propose a model for dimerization of MMTV MA in which myristoyl groups stimulate the interaction between MA molecules. Moreover, dimer-forming MA molecules adopt a sequestered conformation with their myristoyl groups entirely buried within the interaction interface. Although this differs from the current model proposed for lentiviruses, in which oligomerization of MA triggers exposure of myristoyl group, it appears convenient for intracellular assembly, which involves no apparent membrane interaction and allows the myristoyl group to be sequestered during oligomerization. Electronic supplementary material The online version of this article (doi:10.1186/s12977-015-0235-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Michal Doležal
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
| | - Aleš Zábranský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
| | - Jiří Dostál
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
| | - Ondřej Vaněk
- Department of Biochemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 40, Prague, Czech Republic.
| | - Jiří Brynda
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
| | - Martin Lepšík
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
| | - Romana Hadravová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
| | - Iva Pichová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, v.v.i., Flemingovo nám. 2, 166 10, Prague, Czech Republic.
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Goldstone DC, Flower TG, Ball NJ, Sanz-Ramos M, Yap MW, Ogrodowicz RW, Stanke N, Reh J, Lindemann D, Stoye JP, Taylor IA. A unique spumavirus Gag N-terminal domain with functional properties of orthoretroviral matrix and capsid. PLoS Pathog 2013; 9:e1003376. [PMID: 23675305 PMCID: PMC3649970 DOI: 10.1371/journal.ppat.1003376] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Accepted: 04/04/2013] [Indexed: 11/19/2022] Open
Abstract
The Spumaretrovirinae, or foamyviruses (FVs) are complex retroviruses that infect many species of monkey and ape. Although FV infection is apparently benign, trans-species zoonosis is commonplace and has resulted in the isolation of the Prototypic Foamy Virus (PFV) from human sources and the potential for germ-line transmission. Despite little sequence homology, FV and orthoretroviral Gag proteins perform equivalent functions, including genome packaging, virion assembly, trafficking and membrane targeting. In addition, PFV Gag interacts with the FV Envelope (Env) protein to facilitate budding of infectious particles. Presently, there is a paucity of structural information with regards FVs and it is unclear how disparate FV and orthoretroviral Gag molecules share the same function. Therefore, in order to probe the functional overlap of FV and orthoretroviral Gag and learn more about FV egress and replication we have undertaken a structural, biophysical and virological study of PFV-Gag. We present the crystal structure of a dimeric amino terminal domain from PFV, Gag-NtD, both free and in complex with the leader peptide of PFV Env. The structure comprises a head domain together with a coiled coil that forms the dimer interface and despite the shared function it is entirely unrelated to either the capsid or matrix of Gag from other retroviruses. Furthermore, we present structural, biochemical and virological data that reveal the molecular details of the essential Gag-Env interaction and in addition we also examine the specificity of Trim5α restriction of PFV. These data provide the first information with regards to FV structural proteins and suggest a model for convergent evolution of gag genes where structurally unrelated molecules have become functionally equivalent.
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Affiliation(s)
- David C. Goldstone
- Division of Molecular Structure, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Thomas G. Flower
- Division of Molecular Structure, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Neil J. Ball
- Division of Molecular Structure, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Marta Sanz-Ramos
- Division of Virology, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Melvyn W. Yap
- Division of Virology, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Roksana W. Ogrodowicz
- Division of Molecular Structure, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Nicole Stanke
- Institute of Virology, Technische Universität Dresden, Dresden, Germany
| | - Juliane Reh
- Institute of Virology, Technische Universität Dresden, Dresden, Germany
| | - Dirk Lindemann
- Institute of Virology, Technische Universität Dresden, Dresden, Germany
| | - Jonathan P. Stoye
- Division of Virology, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
| | - Ian A. Taylor
- Division of Molecular Structure, MRC National Institute for Medical Research, the Ridgeway, Mill Hill, London, United Kingdom
- * E-mail:
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Hennig J, Wang I, Sonntag M, Gabel F, Sattler M. Combining NMR and small angle X-ray and neutron scattering in the structural analysis of a ternary protein-RNA complex. JOURNAL OF BIOMOLECULAR NMR 2013; 56:17-30. [PMID: 23456097 DOI: 10.1007/s10858-013-9719-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2012] [Accepted: 02/19/2013] [Indexed: 05/12/2023]
Abstract
Many processes in the regulation of gene expression and signaling involve the formation of protein complexes involving multi-domain proteins. Individual domains that mediate protein-protein and protein-nucleic acid interactions are typically connected by flexible linkers, which contribute to conformational dynamics and enable the formation of complexes with distinct binding partners. Solution techniques are therefore required for structural analysis and to characterize potential conformational dynamics. Nuclear magnetic resonance spectroscopy (NMR) provides such information but often only sparse data are obtained with increasing molecular weight of the complexes. It is therefore beneficial to combine NMR data with additional structural restraints from complementary solution techniques. Small angle X-ray/neutron scattering (SAXS/SANS) data can be efficiently combined with NMR-derived information, either for validation or by providing additional restraints for structural analysis. Here, we show that the combination of SAXS and SANS data can help to refine structural models obtained from data-driven docking using HADDOCK based on sparse NMR data. The approach is demonstrated with the ternary protein-protein-RNA complex involving two RNA recognition motif (RRM) domains of Sex-lethal, the N-terminal cold shock domain of Upstream-to-N-Ras, and msl-2 mRNA. Based on chemical shift perturbations we have mapped protein-protein and protein-RNA interfaces and complemented this NMR-derived information with SAXS data, as well as SANS measurements on subunit-selectively deuterated samples of the ternary complex. Our results show that, while the use of SAXS data is beneficial, the additional combination with contrast variation in SANS data resolves remaining ambiguities and improves the docking based on chemical shift perturbations of the ternary protein-RNA complex.
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Affiliation(s)
- Janosch Hennig
- Institute of Structural Biology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
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Prchal J, Srb P, Hunter E, Ruml T, Hrabal R. The structure of myristoylated Mason-Pfizer monkey virus matrix protein and the role of phosphatidylinositol-(4,5)-bisphosphate in its membrane binding. J Mol Biol 2012; 423:427-38. [PMID: 22863803 DOI: 10.1016/j.jmb.2012.07.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 07/24/2012] [Accepted: 07/27/2012] [Indexed: 10/28/2022]
Abstract
We determined the solution structure of myristoylated Mason-Pfizer monkey virus matrix protein by NMR spectroscopy. The myristoyl group is buried inside the protein and causes a slight reorientation of the helices. This reorientation leads to the creation of a binding site for phosphatidylinositols. The interaction between the matrix protein and phosphatidylinositols carrying C(8) fatty acid chains was monitored by observation of concentration-dependent chemical shift changes of the affected amino acid residues, a saturation transfer difference experiment and changes in (31)P chemical shifts. No differences in the binding mode or affinity were observed with differently phosphorylated phosphatidylinositols. The structure of the matrix protein-phosphatidylinositol-(4,5)-bisphosphate [PI(4,5)P(2)] complex was then calculated with HADDOCK software based on the intermolecular nuclear Overhauser enhancement contacts between the ligand and the matrix protein obtained from a (13)C-filtered/(13)C-edited nuclear Overhauser enhancement spectroscopy experiment. PI(4,5)P(2) binding was not strong enough for triggering of the myristoyl-switch. The structural changes of the myristoylated matrix protein were also found to result in a drop in the oligomerization capacity of the protein.
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Affiliation(s)
- Jan Prchal
- Laboratory of NMR Spectroscopy, Institute of Chemical Technology, Prague, Technická 5, 16628 Prague, Czech Republic
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Prchal J, Junkova P, Strmiskova M, Lipov J, Hynek R, Ruml T, Hrabal R. Expression and purification of myristoylated matrix protein of Mason-Pfizer monkey virus for NMR and MS measurements. Protein Expr Purif 2011; 79:122-7. [PMID: 21640189 PMCID: PMC3141108 DOI: 10.1016/j.pep.2011.05.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 05/12/2011] [Accepted: 05/16/2011] [Indexed: 11/19/2022]
Abstract
Matrix proteins play multiple roles both in early and late stages of the viral replication cycle. Their N-terminal myristoylation is important for interaction with the host cell membrane during virus budding. We used Escherichia coli, carrying N-myristoyltransferase gene, for the expression of the myristoylated His-tagged matrix protein of Mason-Pfizer monkey virus. An efficient, single-step purification procedure eliminating all contaminating proteins including, importantly, the non-myristoylated matrix protein was designed. The comparison of NMR spectra of matrix protein with its myristoylated form revealed substantial structural changes induced by this fatty acid modification.
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Affiliation(s)
- Jan Prchal
- Laboratory of NMR Spectroscopy, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
- Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
| | - Petra Junkova
- Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
| | - Miroslava Strmiskova
- Laboratory of NMR Spectroscopy, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
| | - Jan Lipov
- Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
| | - Radovan Hynek
- Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
| | - Tomas Ruml
- Department of Biochemistry and Microbiology, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
| | - Richard Hrabal
- Laboratory of NMR Spectroscopy, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
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Srb P, Vlach J, Prchal J, Grocký M, Ruml T, Lang J, Hrabal R. Oligomerization of a retroviral matrix protein is facilitated by backbone flexibility on nanosecond time scale. J Phys Chem B 2011; 115:2634-44. [PMID: 21366213 DOI: 10.1021/jp110420m] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The oligomerization capacity of the retroviral matrix protein is an important feature that affects assembly of immature virions and their interaction with cellular membrane. A combination of NMR relaxation measurements and advanced analysis of molecular dynamics simulation trajectory provided an unprecedentedly detailed insight into internal mobility of matrix proteins of the Mason-Pfizer monkey virus. Strong evidence have been obtained that the oligomerization capacity of the wild-type matrix protein is closely related to the enhanced dynamics of several parts of its backbone on a nanosecond time scale. Increased flexibility has been observed for two regions: the loop between α-helices α2 and α3 and the C-terminal half of α-helix α3 which accommodate amino acid residues that form the oligomerization interface. On the other hand, matrix mutant R55F that has changed structure and does not exhibit any specific oligomerization in solution was found considerably more rigid. Our results document that conformational selection mechanism together with induced fit and favorable structural preorganization play an important role in the control of the oligomerization process.
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Affiliation(s)
- Pavel Srb
- Department of Low Temperature Physics, Faculty of Mathematics and Physics, Charles University , V Holešovičkách 2, 18000 Prague, Czech Republic
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