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Yao J, Hong H. Steric trapping strategy for studying the folding of helical membrane proteins. Methods 2024; 225:1-12. [PMID: 38428472 PMCID: PMC11107808 DOI: 10.1016/j.ymeth.2024.02.007] [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: 11/16/2023] [Revised: 02/11/2024] [Accepted: 02/18/2024] [Indexed: 03/03/2024] Open
Abstract
Elucidating the folding energy landscape of membrane proteins is essential to the understanding of the proteins' stabilizing forces, folding mechanisms, biogenesis, and quality control. This is not a trivial task because the reversible control of folding is inherently difficult in a lipid bilayer environment. Recently, novel methods have been developed, each of which has a unique strength in investigating specific aspects of membrane protein folding. Among such methods, steric trapping is a versatile strategy allowing a reversible control of membrane protein folding with minimal perturbation of native protein-water and protein-lipid interactions. In a nutshell, steric trapping exploits the coupling of spontaneous denaturation of a doubly biotinylated protein to the simultaneous binding of bulky monovalent streptavidin molecules. This strategy has been evolved to investigate key elements of membrane protein folding such as thermodynamic stability, spontaneous denaturation rates, conformational features of the denatured states, and cooperativity of stabilizing interactions. In this review, we describe the critical methodological advancement, limitation, and outlook of the steric trapping strategy.
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Affiliation(s)
- Jiaqi Yao
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA
| | - Heedeok Hong
- Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA; Department of Biochemistry & Molecular Biology, Michigan State University, East Lansing, MI 48824, USA.
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2
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Brangulis K, Drunka L, Akopjana I, Tars K. Structure of the Borrelia burgdorferi ATP-dependent metalloprotease FtsH in its functionally relevant hexameric form. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2024; 1872:140969. [PMID: 37852516 DOI: 10.1016/j.bbapap.2023.140969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 10/13/2023] [Accepted: 10/13/2023] [Indexed: 10/20/2023]
Abstract
ATP-dependent proteases FtsH are conserved in bacteria, mitochondria, and chloroplasts, where they play an essential role in degradation of misfolded/unneeded membrane and cytosolic proteins. It has also been demonstrated that the FtsH homologous protein BB0789 is crucial for mouse and tick infectivity and in vitro growth of the Lyme disease-causing agent Borrelia burgdorferi. This is not surprising, considering B. burgdorferi complex life cycle, residing in both in mammals and ticks, which requires a wide range of membrane proteins and short-lived cytosolic regulatory proteins to invade and persist in the host organism. In the current study, we have solved the crystal structure of the cytosolic BB0789166-614, lacking both N-terminal transmembrane α-helices and the small periplasmic domain. The structure revealed the arrangement of the AAA+ ATPase and the zinc-dependent metalloprotease domains in a hexamer ring, which is essential for ATPase and proteolytic activity. The AAA+ domain was found in an ADP-bound state, while the protease domain showed coordination of a zinc ion by two histidine residues and one aspartic acid residue. The loop region that forms the central pore in the oligomer was poorly defined in the crystal structure and therefore predicted by AlphaFold to complement the missing structural details, providing a complete picture of the functionally relevant hexameric form of BB0789. We confirmed that BB0789 is functionally active, possessing both protease and ATPase activities, thus providing novel structural-functional insights into the protein, which is known to be absolutely necessary for B. burgdorferi to survive and cause Lyme disease.
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Affiliation(s)
- Kalvis Brangulis
- Latvian Biomedical Research and Study Centre, Ratsupites 1 k-1, LV-1067 Riga, Latvia; Department of Human Physiology and Biochemistry, Riga Stradins University, Dzirciema 16, LV-1007 Riga, Latvia.
| | - Laura Drunka
- Latvian Biomedical Research and Study Centre, Ratsupites 1 k-1, LV-1067 Riga, Latvia
| | - Inara Akopjana
- Latvian Biomedical Research and Study Centre, Ratsupites 1 k-1, LV-1067 Riga, Latvia
| | - Kaspars Tars
- Latvian Biomedical Research and Study Centre, Ratsupites 1 k-1, LV-1067 Riga, Latvia
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3
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Wu K, Ma C, Wang Y. Functional Nucleic Acid Probes Based on Two-Photon for Biosensing. BIOSENSORS 2023; 13:836. [PMID: 37754070 PMCID: PMC10527542 DOI: 10.3390/bios13090836] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/18/2023] [Accepted: 08/18/2023] [Indexed: 09/28/2023]
Abstract
Functional nucleic acid (FNA) probes have been widely used in environmental monitoring, food analysis, clinical diagnosis, and biological imaging because of their easy synthesis, functional modification, flexible design, and stable properties. However, most FNA probes are designed based on one-photon (OP) in the ultraviolet or visible regions, and the effectiveness of these OP-based FNA probes may be hindered by certain factors, such as their potential for photodamage and limited light tissue penetration. Two-photon (TP) is characterized by the nonlinear absorption of two relatively low-energy photons of near-infrared (NIR) light with the resulting emission of high-energy ultraviolet or visible light. TP-based FNA probes have excellent properties, including lower tissue self-absorption and autofluorescence, reduced photodamage and photobleaching, and higher spatial resolution, making them more advantageous than the conventional OP-based FNA probes in biomedical sensing. In this review, we summarize the recent advances of TP-excited and -activated FNA probes and detail their applications in biomolecular detection. In addition, we also share our views on the highlights and limitations of TP-based FNA probes. The ultimate goal is to provide design approaches for the development of high-performance TP-based FNA probes, thereby promoting their biological applications.
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Affiliation(s)
- Kefeng Wu
- GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
- Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics, Guangzhou 510700, China
| | - Changbei Ma
- School of Life Sciences, Central South University, Changsha 410013, China
| | - Yisen Wang
- GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
- Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics, Guangzhou 510700, China
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4
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Hari SB, Morehouse JP, Baker TA, Sauer RT. FtsH degrades kinetically stable dimers of cyclopropane fatty acid synthase via an internal degron. Mol Microbiol 2023; 119:101-111. [PMID: 36456794 PMCID: PMC9851988 DOI: 10.1111/mmi.15009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 11/21/2022] [Accepted: 11/24/2022] [Indexed: 12/05/2022]
Abstract
Targeted protein degradation plays important roles in stress responses in all cells. In E. coli, the membrane-bound AAA+ FtsH protease degrades cytoplasmic and membrane proteins. Here, we demonstrate that FtsH degrades cyclopropane fatty acid (CFA) synthase, whose synthesis is induced upon nutrient deprivation and entry into stationary phase. We find that neither the disordered N-terminal residues nor the structured C-terminal residues of the kinetically stable CFA-synthase dimer are required for FtsH recognition and degradation. Experiments with fusion proteins support a model in which an internal degron mediates FtsH recognition as a prelude to unfolding and proteolysis. These findings elucidate the terminal step in the life cycle of CFA synthase and provide new insight into FtsH function.
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5
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Morehouse JP, Baker TA, Sauer RT. FtsH degrades dihydrofolate reductase by recognizing a partially folded species. Protein Sci 2022; 31:e4410. [PMID: 36630366 PMCID: PMC9601784 DOI: 10.1002/pro.4410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/21/2022] [Accepted: 07/24/2022] [Indexed: 01/14/2023]
Abstract
AAA+ proteolytic machines play essential roles in maintaining and rebalancing the cellular proteome in response to stress, developmental cues, and environmental changes. Of the five AAA+ proteases in Escherichia coli, FtsH is unique in its attachment to the inner membrane and its function in degrading both membrane and cytosolic proteins. E. coli dihydrofolate reductase (DHFR) is a stable and biophysically well-characterized protein, which a previous study found resisted FtsH degradation despite the presence of an ssrA degron. By contrast, we find that FtsH degrades DHFR fused to a long peptide linker and ssrA tag. Surprisingly, we also find that FtsH degrades DHFR with shorter linkers and ssrA tag, and without any linker or tag. Thus, FtsH must be able to recognize a sequence element or elements within DHFR. We find that FtsH degradation of DHFR is noncanonical in the sense that it does not rely upon recognition of an unstructured polypeptide at or near the N-terminus or C-terminus of the substrate. Results using peptide-array experiments, mutant DHFR proteins, and fusion proteins suggest that FtsH recognizes an internal sequence in a species of DHFR that is partially unfolded. Overall, our findings provide insight into substrate recognition by FtsH and indicate that its degradation capacity is broader than previously reported.
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Affiliation(s)
- Juhee P. Morehouse
- Department of BiologyMassachusetts Institute of TechnologyCambridgeMassachusettsUSA
| | - Tania A. Baker
- Department of BiologyMassachusetts Institute of TechnologyCambridgeMassachusettsUSA
| | - Robert T. Sauer
- Department of BiologyMassachusetts Institute of TechnologyCambridgeMassachusettsUSA
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6
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Hu K, Matsuura H, Shirakashi R. Stochastic Analysis of Molecular Dynamics Reveals the Rotation Dynamics Distribution of Water around Lysozyme. J Phys Chem B 2022; 126:4520-4530. [PMID: 35675630 DOI: 10.1021/acs.jpcb.2c00970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Water dynamics is essential to biochemical processes by mediating all such reactions, including biomolecular degeneration in solutions. To disentangle the molecular-scale distribution of water dynamics around a solute biomolecule, we investigated here the rotational dynamics of water around lysozyme by combining molecular dynamics (MD) simulations and broadband dielectric spectroscopy (BDS). A statistical analysis using the relaxation times and trajectories of every single water molecule was proposed, and the two-dimensional probability distribution of water at a distance from the lysozyme surface with a rotational relaxation time was given. For the observed lysozyme solutions of 34-284 mg/mL, we discovered that the dielectric relaxation time obtained from this distribution agrees well with the measured γ relaxation time, which suggests that rotational self-correlation of water molecules underlies the gigahertz domain of the dielectric spectra. Regardless of protein concentration, water rotational relaxation time versus the distance from the lysozyme surface revealed that the water rotation is severely retarded within 3 Å from the lysozyme surface and is nearly comparable to pure water when farther than 10 Å. The dimension of the first hydration layer was subsequently identified in terms of the relationship between the acceleration of water rotation and the distance from the protein surface.
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Affiliation(s)
- Kang Hu
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro City, Tokyo 153-8505, Japan.,Department of Mechanical Engineering, The University of Tokyo, 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hiroaki Matsuura
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro City, Tokyo 153-8505, Japan.,Research Fellow of the Japan Society for the Promotion of Science, Chiyoda-ku, Tokyo 102-0083, Japan
| | - Ryo Shirakashi
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro City, Tokyo 153-8505, Japan
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7
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Lipid bilayer induces contraction of the denatured state ensemble of a helical-bundle membrane protein. Proc Natl Acad Sci U S A 2022; 119:2109169119. [PMID: 34969836 PMCID: PMC8740594 DOI: 10.1073/pnas.2109169119] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/17/2021] [Indexed: 12/19/2022] Open
Abstract
Defining the denatured state ensemble (DSE) and disordered proteins is essential to understanding folding, chaperone action, degradation, and translocation. As compared with water-soluble proteins, the DSE of membrane proteins is much less characterized. Here, we measure the DSE of the helical membrane protein GlpG of Escherichia coli (E. coli) in native-like lipid bilayers. The DSE was obtained using our steric trapping method, which couples denaturation of doubly biotinylated GlpG to binding of two streptavidin molecules. The helices and loops are probed using limited proteolysis and mass spectrometry, while the dimensions are determined using our paramagnetic biotin derivative and double electron-electron resonance spectroscopy. These data, along with our Upside simulations, identify the DSE as being highly dynamic, involving the topology changes and unfolding of some of the transmembrane (TM) helices. The DSE is expanded relative to the native state but only to 15 to 75% of the fully expanded condition. The degree of expansion depends on the local protein packing and the lipid composition. E. coli's lipid bilayer promotes the association of TM helices in the DSE and, probably in general, facilitates interhelical interactions. This tendency may be the outcome of a general lipophobic effect of proteins within the cell membranes.
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8
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Hong H, Choi HK, Yoon TY. Untangling the complexity of membrane protein folding. Curr Opin Struct Biol 2022; 72:237-247. [PMID: 34995926 DOI: 10.1016/j.sbi.2021.11.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/22/2021] [Accepted: 11/24/2021] [Indexed: 11/15/2022]
Abstract
Delineating the folding steps of helical-bundle membrane proteins has been a challenging task. Many questions remain unanswered, including the conformation and stability of the states populated during folding, the shape of the energy barriers between the states, and the role of lipids as a solvent in mediating the folding. Recently, theoretical frames have matured to a point that permits detailed dissection of the folding steps, and advances in experimental techniques at both single-molecule and ensemble levels enable selective modulation of specific steps for quantitative determination of the folding energy landscapes. We also discuss how lipid molecules would play an active role in shaping the folding energy landscape of membrane proteins, and how folding of multi-domain membrane proteins can be understood based on our current knowledge. We conclude this review by offering an outlook for emerging questions in the study of membrane protein folding.
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Affiliation(s)
- Heedeok Hong
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA.
| | - Hyun-Kyu Choi
- Wallace H. Coulter Department of Biomedical Engineering and Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA
| | - Tae-Young Yoon
- School of Biological Sciences and Institute for Molecular Biology and Genetics, Seoul National University, Seoul, 08826, South Korea.
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9
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Prabudiansyah I, van der Valk R, Aubin-Tam ME. Reconstitution and functional characterization of the FtsH protease in lipid nanodiscs. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1863:183526. [PMID: 33278347 DOI: 10.1016/j.bbamem.2020.183526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/19/2020] [Accepted: 11/24/2020] [Indexed: 01/09/2023]
Abstract
FtsH is a membrane-bound protease that plays a crucial role in proteolytic regulation of many cellular functions. It is universally conserved in bacteria and responsible for the degradation of misfolded or misassembled proteins. A recent study has determined the structure of bacterial FtsH in detergent micelles. To properly study the function of FtsH in a native-like environment, we reconstituted the FtsH complex into lipid nanodiscs. We found that FtsH in membrane scaffold protein (MSP) nanodiscs maintains its native hexameric conformation and is functionally active. We further investigated the effect of the lipid bilayer composition (acyl chain length, saturation, head group charge and size) on FtsH proteolytic activity. We found that the lipid acyl chain length influences AaFtsH activity in nanodiscs, with the greatest activity in a bilayer of di-C18:1 PC. We conclude that MSP nanodiscs are suitable model membranes for further in vitro studies of the FtsH protease complex.
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Affiliation(s)
- Irfan Prabudiansyah
- Department of Bionanoscience, Delft University of Technology, Van der Maasweg 9, Delft, 2629 HZ, the Netherlands
| | - Ramon van der Valk
- Department of Bionanoscience, Delft University of Technology, Van der Maasweg 9, Delft, 2629 HZ, the Netherlands
| | - Marie-Eve Aubin-Tam
- Department of Bionanoscience, Delft University of Technology, Van der Maasweg 9, Delft, 2629 HZ, the Netherlands.
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10
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Aguiar BG, Dumas C, Maaroufi H, Padmanabhan PK, Papadopoulou B. The AAA + ATPase valosin-containing protein (VCP)/p97/Cdc48 interaction network in Leishmania. Sci Rep 2020; 10:13135. [PMID: 32753747 PMCID: PMC7403338 DOI: 10.1038/s41598-020-70010-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 07/14/2020] [Indexed: 12/11/2022] Open
Abstract
Valosin-containing protein (VCP)/p97/Cdc48 is an AAA + ATPase associated with many ubiquitin-dependent cellular pathways that are central to protein quality control. VCP binds various cofactors, which determine pathway selectivity and substrate processing. Here, we used co-immunoprecipitation and mass spectrometry studies coupled to in silico analyses to identify the Leishmania infantum VCP (LiVCP) interactome and to predict molecular interactions between LiVCP and its major cofactors. Our data support a largely conserved VCP protein network in Leishmania including known but also novel interaction partners. Network proteomics analysis confirmed LiVCP-cofactor interactions and provided novel insights into cofactor-specific partners and the diversity of LiVCP complexes, including the well-characterized VCP-UFD1-NPL4 complex. Gene Ontology analysis coupled with digitonin fractionation and immunofluorescence studies support cofactor subcellular compartmentalization with either cytoplasmic or organellar or vacuolar localization. Furthermore, in silico models based on 3D homology modeling and protein-protein docking indicated that the conserved binding modules of LiVCP cofactors, except for NPL4, interact with specific binding sites in the hexameric LiVCP protein, similarly to their eukaryotic orthologs. Altogether, these results allowed us to build the first VCP protein interaction network in parasitic protozoa through the identification of known and novel interacting partners potentially associated with distinct VCP complexes.
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Affiliation(s)
- Bruno Guedes Aguiar
- Division of Infectious Disease and Immunity, CHU de Quebec Research Center-Laval University, 2705 Laurier Blvd, Quebec, QC, G1V 4G2, Canada
- Department of Microbiology-Infectious Disease and Immunology, Faculty of Medicine, University Laval, Quebec, QC, G1V 4G2, Canada
- Department of Community Medicine, Federal University of Piauí, Teresina, Brazil
| | - Carole Dumas
- Division of Infectious Disease and Immunity, CHU de Quebec Research Center-Laval University, 2705 Laurier Blvd, Quebec, QC, G1V 4G2, Canada
- Department of Microbiology-Infectious Disease and Immunology, Faculty of Medicine, University Laval, Quebec, QC, G1V 4G2, Canada
| | - Halim Maaroufi
- Institut de Biologie Intégrative Et Des Systèmes (IBIS), Laval University, Quebec, QC, Canada
| | - Prasad K Padmanabhan
- Division of Infectious Disease and Immunity, CHU de Quebec Research Center-Laval University, 2705 Laurier Blvd, Quebec, QC, G1V 4G2, Canada
- Department of Microbiology-Infectious Disease and Immunology, Faculty of Medicine, University Laval, Quebec, QC, G1V 4G2, Canada
| | - Barbara Papadopoulou
- Division of Infectious Disease and Immunity, CHU de Quebec Research Center-Laval University, 2705 Laurier Blvd, Quebec, QC, G1V 4G2, Canada.
- Department of Microbiology-Infectious Disease and Immunology, Faculty of Medicine, University Laval, Quebec, QC, G1V 4G2, Canada.
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11
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Began J, Cordier B, Březinová J, Delisle J, Hexnerová R, Srb P, Rampírová P, Kožíšek M, Baudet M, Couté Y, Galinier A, Veverka V, Doan T, Strisovsky K. Rhomboid intramembrane protease YqgP licenses bacterial membrane protein quality control as adaptor of FtsH AAA protease. EMBO J 2020; 39:e102935. [PMID: 31930742 PMCID: PMC7231995 DOI: 10.15252/embj.2019102935] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 11/18/2019] [Accepted: 12/12/2019] [Indexed: 12/31/2022] Open
Abstract
Magnesium homeostasis is essential for life and depends on magnesium transporters, whose activity and ion selectivity need to be tightly controlled. Rhomboid intramembrane proteases pervade the prokaryotic kingdom, but their functions are largely elusive. Using proteomics, we find that Bacillus subtilis rhomboid protease YqgP interacts with the membrane‐bound ATP‐dependent processive metalloprotease FtsH and cleaves MgtE, the major high‐affinity magnesium transporter in B. subtilis. MgtE cleavage by YqgP is potentiated in conditions of low magnesium and high manganese or zinc, thereby protecting B. subtilis from Mn2+/Zn2+ toxicity. The N‐terminal cytosolic domain of YqgP binds Mn2+ and Zn2+ ions and facilitates MgtE cleavage. Independently of its intrinsic protease activity, YqgP acts as a substrate adaptor for FtsH, a function that is necessary for degradation of MgtE. YqgP thus unites protease and pseudoprotease function, hinting at the evolutionary origin of rhomboid pseudoproteases such as Derlins that are intimately involved in eukaryotic ER‐associated degradation (ERAD). Conceptually, the YqgP‐FtsH system we describe here is analogous to a primordial form of “ERAD” in bacteria and exemplifies an ancestral function of rhomboid‐superfamily proteins.
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Affiliation(s)
- Jakub Began
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic.,Department of Genetics and Microbiology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Baptiste Cordier
- Laboratoire de Chimie Bactérienne (LCB), Institut de Microbiologie de la Méditerranée (IMM), CNRS, UMR 7283, Aix Marseille Univ, Marseille Cedex 20, France
| | - Jana Březinová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Prague, Czech Republic
| | - Jordan Delisle
- Laboratoire de Chimie Bactérienne (LCB), Institut de Microbiologie de la Méditerranée (IMM), CNRS, UMR 7283, Aix Marseille Univ, Marseille Cedex 20, France
| | - Rozálie Hexnerová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic
| | - Pavel Srb
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic
| | - Petra Rampírová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic
| | - Milan Kožíšek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic
| | - Mathieu Baudet
- CEA, Inserm, IRIG-BGE, Univ. Grenoble Alpes, Grenoble, France
| | - Yohann Couté
- CEA, Inserm, IRIG-BGE, Univ. Grenoble Alpes, Grenoble, France
| | - Anne Galinier
- Laboratoire de Chimie Bactérienne (LCB), Institut de Microbiologie de la Méditerranée (IMM), CNRS, UMR 7283, Aix Marseille Univ, Marseille Cedex 20, France
| | - Václav Veverka
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic.,Department of Cell Biology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Thierry Doan
- Laboratoire de Chimie Bactérienne (LCB), Institut de Microbiologie de la Méditerranée (IMM), CNRS, UMR 7283, Aix Marseille Univ, Marseille Cedex 20, France.,Laboratoire d'Ingénierie des Systèmes Macromoléculaires (LISM), Institut de Microbiologie de la Méditerranée (IMM), CNRS, UMR 7255, Aix Marseille Univ, Marseille Cedex 20, France
| | - Kvido Strisovsky
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Prague, Czech Republic
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12
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Krynická V, Georg J, Jackson PJ, Dickman MJ, Hunter CN, Futschik ME, Hess WR, Komenda J. Depletion of the FtsH1/3 Proteolytic Complex Suppresses the Nutrient Stress Response in the Cyanobacterium Synechocystis sp strain PCC 6803. THE PLANT CELL 2019; 31:2912-2928. [PMID: 31615847 PMCID: PMC6925008 DOI: 10.1105/tpc.19.00411] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 09/03/2019] [Accepted: 10/13/2019] [Indexed: 05/04/2023]
Abstract
The membrane-embedded FtsH proteases found in bacteria, chloroplasts, and mitochondria are involved in diverse cellular processes including protein quality control and regulation. The genome of the model cyanobacterium Synechocystis sp PCC 6803 encodes four FtsH homologs designated FtsH1 to FtsH4. The FtsH3 homolog is present in two hetero-oligomeric complexes: FtsH2/3, which is responsible for photosystem II quality control, and the essential FtsH1/3 complex, which helps maintain Fe homeostasis by regulating the level of the transcription factor Fur. To gain a more comprehensive insight into the physiological roles of FtsH hetero-complexes, we performed genome-wide expression profiling and global proteomic analyses of Synechocystis mutants conditionally depleted of FtsH3 or FtsH1 grown under various nutrient conditions. We show that the lack of FtsH1/3 leads to a drastic reduction in the transcriptional response to nutrient stress of not only Fur but also the Pho, NdhR, and NtcA regulons. In addition, this effect is accompanied by the accumulation of the respective transcription factors. Thus, the FtsH1/3 complex is of critical importance for acclimation to iron, phosphate, carbon, and nitrogen starvation in Synechocystis.plantcell;31/12/2912/FX1F1fx1.
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Affiliation(s)
- Vendula Krynická
- Centre Algatech, Institute of Microbiology of the Czech Academy of Sciences, Třeboň, 379 81, Czech Republic
- Faculty of Science, University of South Bohemia, České Budějovice, 370 05, Czech Republic
| | - Jens Georg
- Genetics & Experimental Bioinformatics, Faculty of Biology, University of Freiburg, D-79104 Freiburg, Germany
| | - Philip J Jackson
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom
- ChELSI Institute, Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - Mark J Dickman
- ChELSI Institute, Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom
| | - C Neil Hunter
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom
| | - Matthias E Futschik
- School of Biomedical Sciences, Institute of Translational and Stratified Medicine (ITSMed), Faculty of Medicine and Dentistry, University of Plymouth, Plymouth PL6 8BU, United Kingdom
- Systems Biology and Bioinformatics Laboratory (SysBioLab), Centre of Marine Sciences (CCMAR), University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Wolfgang R Hess
- Genetics & Experimental Bioinformatics, Faculty of Biology, University of Freiburg, D-79104 Freiburg, Germany
- Freiburg Institute for Advanced Studies, University of Freiburg, Albertstrße 19, D-79104 Freiburg, Germany
| | - Josef Komenda
- Centre Algatech, Institute of Microbiology of the Czech Academy of Sciences, Třeboň, 379 81, Czech Republic
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13
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Tian W, Naveed H, Lin M, Liang J. GeTFEP: A general transfer free energy profile of transmembrane proteins. Protein Sci 2019; 29:469-479. [PMID: 31658402 DOI: 10.1002/pro.3763] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 10/20/2019] [Accepted: 10/23/2019] [Indexed: 01/06/2023]
Abstract
Free energy of transferring amino acid side-chains from aqueous environment into lipid bilayers, known as transfer free energy (TFE), provides important information on the thermodynamic stability of membrane proteins. In this study, we derived a TFE profile named General Transfer Free Energy Profile (GeTFEP) based on computation of the TFEs of 58 β-barrel membrane proteins (βMPs). The GeTFEP agrees well with experimentally measured and computationally derived TFEs. Analysis based on the GeTFEP shows that residues in different regions of the transmembrane (TM) segments of βMPs have different roles during the membrane insertion process. Results further reveal the importance of the sequence pattern of TM strands in stabilizing βMPs in the membrane environment. In addition, we show that GeTFEP can be used to predict the positioning and the orientation of βMPs in the membrane. We also show that GeTFEP can be used to identify structurally or functionally important amino acid residue sites of βMPs. Furthermore, the TM segments of α-helical membrane proteins can be accurately predicted with GeTFEP, suggesting that the GeTFEP is of general applicability in studying membrane protein.
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Affiliation(s)
- Wei Tian
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
| | - Hammad Naveed
- Department of Computer Science, National University of Computer and Emerging Sciences (NUCES-FAST), Islamabad, Islamabad Capital Territory, Pakistan
| | - Meishan Lin
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
| | - Jie Liang
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
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14
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Wang Z, Jumper JM, Freed KF, Sosnick TR. On the Interpretation of Force-Induced Unfolding Studies of Membrane Proteins Using Fast Simulations. Biophys J 2019; 117:1429-1441. [PMID: 31587831 DOI: 10.1016/j.bpj.2019.09.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 08/25/2019] [Accepted: 09/12/2019] [Indexed: 11/25/2022] Open
Abstract
Single-molecule force spectroscopy has proven extremely beneficial in elucidating folding pathways for membrane proteins. Here, we simulate these measurements, conducting hundreds of unfolding trajectories using our fast Upside algorithm for slow enough speeds to reproduce key experimental features that may be missed using all-atom methods. The speed also enables us to determine the logarithmic dependence of pulling velocities on the rupture levels to better compare to experimental values. For simulations of atomic force microscope measurements in which force is applied vertically to the C-terminus of bacteriorhodopsin, we reproduce the major experimental features including even the back-and-forth unfolding of single helical turns. When pulling laterally on GlpG to mimic the experiment, we observe quite different behavior depending on the stiffness of the spring. With a soft spring, as used in the experimental studies with magnetic tweezers, the force remains nearly constant after the initial unfolding event, and a few pathways and a high degree of cooperativity are observed in both the experiment and simulation. With a stiff spring, however, the force drops to near zero after each major unfolding event, and numerous intermediates are observed along a wide variety of pathways. Hence, the mode of force application significantly alters the perception of the folding landscape, including the number of intermediates and the degree of folding cooperativity, important issues that should be considered when designing experiments and interpreting unfolding data.
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Affiliation(s)
- Zongan Wang
- Department of Chemistry, James Franck Institute, The University of Chicago, Chicago, Illinois; Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, Illinois
| | - John M Jumper
- Department of Chemistry, James Franck Institute, The University of Chicago, Chicago, Illinois; Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, Illinois
| | - Karl F Freed
- Department of Chemistry, James Franck Institute, The University of Chicago, Chicago, Illinois.
| | - Tobin R Sosnick
- Department of Biochemistry and Molecular Biology, The University of Chicago, Chicago, Illinois; Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois.
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15
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Marinko J, Huang H, Penn WD, Capra JA, Schlebach JP, Sanders CR. Folding and Misfolding of Human Membrane Proteins in Health and Disease: From Single Molecules to Cellular Proteostasis. Chem Rev 2019; 119:5537-5606. [PMID: 30608666 PMCID: PMC6506414 DOI: 10.1021/acs.chemrev.8b00532] [Citation(s) in RCA: 153] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Indexed: 12/13/2022]
Abstract
Advances over the past 25 years have revealed much about how the structural properties of membranes and associated proteins are linked to the thermodynamics and kinetics of membrane protein (MP) folding. At the same time biochemical progress has outlined how cellular proteostasis networks mediate MP folding and manage misfolding in the cell. When combined with results from genomic sequencing, these studies have established paradigms for how MP folding and misfolding are linked to the molecular etiologies of a variety of diseases. This emerging framework has paved the way for the development of a new class of small molecule "pharmacological chaperones" that bind to and stabilize misfolded MP variants, some of which are now in clinical use. In this review, we comprehensively outline current perspectives on the folding and misfolding of integral MPs as well as the mechanisms of cellular MP quality control. Based on these perspectives, we highlight new opportunities for innovations that bridge our molecular understanding of the energetics of MP folding with the nuanced complexity of biological systems. Given the many linkages between MP misfolding and human disease, we also examine some of the exciting opportunities to leverage these advances to address emerging challenges in the development of therapeutics and precision medicine.
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Affiliation(s)
- Justin
T. Marinko
- Department
of Biochemistry, Vanderbilt University, Nashville, Tennessee 37240, United States
- Center
for Structural Biology, Vanderbilt University, Nashville, Tennessee 37240, United States
| | - Hui Huang
- Department
of Biochemistry, Vanderbilt University, Nashville, Tennessee 37240, United States
- Center
for Structural Biology, Vanderbilt University, Nashville, Tennessee 37240, United States
| | - Wesley D. Penn
- Department
of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - John A. Capra
- Center
for Structural Biology, Vanderbilt University, Nashville, Tennessee 37240, United States
- Department
of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37245, United States
| | - Jonathan P. Schlebach
- Department
of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Charles R. Sanders
- Department
of Biochemistry, Vanderbilt University, Nashville, Tennessee 37240, United States
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16
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Yang Y, Gunasekara M, Muhammednazaar S, Li Z, Hong H. Proteolysis mediated by the membrane-integrated ATP-dependent protease FtsH has a unique nonlinear dependence on ATP hydrolysis rates. Protein Sci 2019; 28:1262-1275. [PMID: 31008538 DOI: 10.1002/pro.3629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 04/17/2019] [Indexed: 12/16/2022]
Abstract
ATPases associated with diverse cellular activities (AAA+) proteases utilize ATP hydrolysis to actively unfold native or misfolded proteins and translocate them into a protease chamber for degradation. This basic mechanism yields diverse cellular consequences, including the removal of misfolded proteins, control of regulatory circuits, and remodeling of protein conformation. Among various bacterial AAA+ proteases, FtsH is only membrane-integrated and plays a key role in membrane protein quality control. Previously, we have shown that FtsH has substantial unfoldase activity for degrading membrane proteins overcoming a dual energetic burden of substrate unfolding and membrane dislocation. Here, we asked how efficiently FtsH utilizes ATP hydrolysis to degrade membrane proteins. To answer this question, we measured degradation rates of the model membrane substrate GlpG at various ATP hydrolysis rates in the lipid bilayers. We find that the dependence of degradation rates on ATP hydrolysis rates is highly nonlinear: (i) FtsH cannot degrade GlpG until it reaches a threshold ATP hydrolysis rate; (ii) after exceeding the threshold, the degradation rates steeply increase and saturate at the ATP hydrolysis rates far below the maxima. During the steep increase, FtsH efficiently utilizes ATP hydrolysis for degradation, consuming only 40-60% of the total ATP cost measured at the maximal ATP hydrolysis rates. This behavior does not fundamentally change against water-soluble substrates as well as upon addition of the macromolecular crowding agent Ficoll 70. The Hill analysis shows that the nonlinearity stems from coupling of three to five ATP hydrolysis events to degradation, which represents unique cooperativity compared to other AAA+ proteases including ClpXP, HslUV, Lon, and proteasomes.
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Affiliation(s)
- Yiqing Yang
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824
| | - Mihiravi Gunasekara
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824
| | | | - Zhen Li
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824
| | - Heedeok Hong
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824.,Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan, 48824
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17
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Energy landscape underlying spontaneous insertion and folding of an alpha-helical transmembrane protein into a bilayer. Nat Commun 2018; 9:4949. [PMID: 30470737 PMCID: PMC6251876 DOI: 10.1038/s41467-018-07320-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 10/18/2018] [Indexed: 11/08/2022] Open
Abstract
Membrane protein folding mechanisms and rates are notoriously hard to determine. A recent force spectroscopy study of the folding of an α-helical membrane protein, GlpG, showed that the folded state has a very high kinetic stability and a relatively low thermodynamic stability. Here, we simulate the spontaneous insertion and folding of GlpG into a bilayer. An energy landscape analysis of the simulations suggests that GlpG folds via sequential insertion of helical hairpins. The rate-limiting step involves simultaneous insertion and folding of the final helical hairpin. The striking features of GlpG's experimentally measured landscape can therefore be explained by a partially inserted metastable state, which leads us to a reinterpretation of the rates measured by force spectroscopy. Our results are consistent with the helical hairpin hypothesis but call into question the two-stage model of membrane protein folding as a general description of folding mechanisms in the presence of bilayers.
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18
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ATPase and Protease Domain Movements in the Bacterial AAA+ Protease FtsH Are Driven by Thermal Fluctuations. J Mol Biol 2018; 430:4592-4602. [PMID: 30044948 DOI: 10.1016/j.jmb.2018.07.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 07/10/2018] [Accepted: 07/17/2018] [Indexed: 01/27/2023]
Abstract
AAA+ proteases are essential players in cellular pathways of protein degradation. Elucidating their conformational behavior is key for understanding their reaction mechanism and, importantly, for elaborating our understanding of mutation-induced protease deficiencies. Here, we study the structural dynamics of the Thermotoga maritima AAA+ hexameric ring metalloprotease FtsH (TmFtsH). Using a single-molecule Förster resonance energy transfer approach to monitor ATPase and protease inter-domain conformational changes in real time, we show that TmFtsH-even in the absence of nucleotide-is a highly dynamic protease undergoing sequential transitions between five states on the second timescale. Addition of ATP does not influence the number of states or change the timescale of domain motions but affects the state occupancy distribution leading to an inter-domain compaction. These findings suggest that thermal energy, but not chemical energy, provides the major driving force for conformational switching, while ATP, through a state reequilibration, introduces directionality into this process. The TmFtsH A359V mutation, a homolog of the human pathogenic A510V mutation of paraplegin (SPG7) causing hereditary spastic paraplegia, does not affect the dynamic behavior of the protease but impairs the ATP-coupled domain compaction and, thus, may account for protease malfunctioning and pathogenesis in hereditary spastic paraplegia.
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