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Swapna GVT, Dube N, Roth MJ, Montelione GT. Modeling Alternative Conformational States of Pseudo-Symmetric Solute Carrier Transporters using Methods from Machine Learning. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.15.603529. [PMID: 39071413 PMCID: PMC11275918 DOI: 10.1101/2024.07.15.603529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
The Solute Carrier (SLC) superfamily of integral membrane proteins function to transport a wide array of solutes across the plasma and organelle membranes. SLC proteins also function as important drug transporters and as viral receptors. Despite being classified as a single superfamily, SLC proteins do not share a single common fold classification; however, most belong to multi-pass transmembrane helical protein fold families. SLC proteins populate different conformational states during the solute transport process, including outward open, intermediate (occluded), and inward open conformational states. For some SLC fold families this structural "flipping" corresponds to swapping between conformations of their N-terminal and C-terminal symmetry-related sub-structures. Conventional AlphaFold2 or Evolutionary Scale Modeling methods typically generate models for only one of these multiple conformational states of SLC proteins. Here we describe a fast and simple approach for modeling multiple conformational states of SLC proteins using a combined ESM - AF2 process. The resulting multi-state models are validated by comparison with sequence-based evolutionary co-variance data (ECs) that encode information about contacts present in the various conformational states adopted by the protein. We also explored the impact of mutations on conformational distributions of SLC proteins modeled by AlphaFold2 using both conventional and enhanced sampling methods. This approach for modeling conformational landscapes of pseudo-symmetric SLC proteins is demonstrated for several integral membrane protein transporters, including SLC35F2 the receptor of a feline leukemia virus envelope protein required for viral entry into eukaryotic cells.
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Affiliation(s)
- G V T Swapna
- Dept. of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, Troy, New York, 12180 USA
- Department of Pharmacology, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway NJ 08854 USA
| | - Namita Dube
- Dept. of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, Troy, New York, 12180 USA
| | - Monica J Roth
- Department of Pharmacology, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, Piscataway NJ 08854 USA
| | - Gaetano T Montelione
- Dept. of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Sciences, Rensselaer Polytechnic Institute, Troy, New York, 12180 USA
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2
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Beckstein O, Naughton F. General principles of secondary active transporter function. BIOPHYSICS REVIEWS 2022; 3:011307. [PMID: 35434715 PMCID: PMC8984959 DOI: 10.1063/5.0047967] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 02/23/2022] [Indexed: 04/13/2023]
Abstract
Transport of ions and small molecules across the cell membrane against electrochemical gradients is catalyzed by integral membrane proteins that use a source of free energy to drive the energetically uphill flux of the transported substrate. Secondary active transporters couple the spontaneous influx of a "driving" ion such as Na+ or H+ to the flux of the substrate. The thermodynamics of such cyclical non-equilibrium systems are well understood, and recent work has focused on the molecular mechanism of secondary active transport. The fact that these transporters change their conformation between an inward-facing and outward-facing conformation in a cyclical fashion, called the alternating access model, is broadly recognized as the molecular framework in which to describe transporter function. However, only with the advent of high resolution crystal structures and detailed computer simulations, it has become possible to recognize common molecular-level principles between disparate transporter families. Inverted repeat symmetry in secondary active transporters has shed light onto how protein structures can encode a bi-stable two-state system. Based on structural data, three broad classes of alternating access transitions have been described as rocker-switch, rocking-bundle, and elevator mechanisms. More detailed analysis indicates that transporters can be understood as gated pores with at least two coupled gates. These gates are not just a convenient cartoon element to illustrate a putative mechanism but map to distinct parts of the transporter protein. Enumerating all distinct gate states naturally includes occluded states in the alternating access picture and also suggests what kind of protein conformations might be observable. By connecting the possible conformational states and ion/substrate bound states in a kinetic model, a unified picture emerges in which the symporter, antiporter, and uniporter functions are extremes in a continuum of functionality. As usual with biological systems, few principles and rules are absolute and exceptions are discussed as well as how biological complexity may be integrated in quantitative kinetic models that may provide a bridge from the structure to function.
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Affiliation(s)
- Oliver Beckstein
- Department of Physics, Arizona State University, Tempe, Arizona 85287, USA
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3
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Masrati G, Mondal R, Rimon A, Kessel A, Padan E, Lindahl E, Ben-Tal N. An angular motion of a conserved four-helix bundle facilitates alternating access transport in the TtNapA and EcNhaA transporters. Proc Natl Acad Sci U S A 2020; 117:31850-31860. [PMID: 33257549 PMCID: PMC7749304 DOI: 10.1073/pnas.2002710117] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
There is ongoing debate regarding the mechanism through which cation/proton antiporters (CPAs), like Thermus thermophilus NapA (TtNapA) and Escherichia coli NapA (EcNhaA), alternate between their outward- and inward-facing conformations in the membrane. CPAs comprise two domains, and it is unclear whether the transition is driven by their rocking-bundle or elevator motion with respect to each other. Here we address this question using metadynamics simulations of TtNapA, where we bias conformational sampling along two axes characterizing the two proposed mechanisms: angular and translational motions, respectively. By applying the bias potential for the two axes simultaneously, as well as to the angular, but not the translational, axis alone, we manage to reproduce each of the two known states of TtNapA when starting from the opposite state, in support of the rocking-bundle mechanism as the driver of conformational change. Next, starting from the inward-facing conformation of EcNhaA, we sample what could be its long-sought-after outward-facing conformation and verify it using cross-linking experiments.
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Affiliation(s)
- Gal Masrati
- Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel
| | - Ramakanta Mondal
- Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Abraham Rimon
- Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Amit Kessel
- Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel
| | - Etana Padan
- Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Erik Lindahl
- Science for Life Laboratory, Stockholm University & KTH Royal Institute of Technology, 171 65 Solna, Sweden
| | - Nir Ben-Tal
- Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel;
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4
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Dwivedi M. Site-directed mutations reflecting functional and structural properties of Ec-NhaA. Biochimie 2020; 180:79-89. [PMID: 33129932 DOI: 10.1016/j.biochi.2020.10.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 10/21/2020] [Accepted: 10/27/2020] [Indexed: 11/20/2022]
Abstract
NhaA antiporters are secondary integral membrane protein critical for maintaining the Na+/H+ cell homeostasis, as a result, they regulate fundamental processes like cell volume and intracellular pH. Exploration of the structural and functional properties can assist to make them effective human drug targets and mechanisms of salt-resistance in plants. NhaA proteins are integrated into cytoplasmic and intracellular membranes, transport 2H+/Na + across the membrane by the canonical alternating access mechanism. There are mutagenesis studies have done on Ec-NhaA predicting residues crucial for function and structure. The unique NhaA structural fold is formed in the middle of the membrane by two transmembrane segments (TMs), TM IV and XI which cross each other creating a delicate electrostatically balanced environment for the binding of Na+/H+. Previously, Asp164, Asp163 and Asp133 residues have been proposed as crucial for Na+/Li + binding on the based on crystal structure and mutation-based studies. However, the pathway and the binding sites for the two protons are still elusive and debatable. This review will provide comprehensive details on various mutations constructed in Ec-NhaA by different research groups using site-directed or random mutagenesis techniques. The selected residues for mutations are located on the sites which are more suspected to have a crucial role in function and structure on NhaA. This information on the single platform would accelerate further studies on the structure-function relationship on NhaA as well as will facilitate to predict the role of Na+/H+ antiporters in human diseases.
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Affiliation(s)
- Manish Dwivedi
- Amity Institute of Biotechnology, Amity University Uttar Pradesh, Gomtinagar Ext., Lucknow, 226028, India.
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5
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Abboud A, Bédoucha P, Byška J, Arnesen T, Reuter N. Dynamics-function relationship in the catalytic domains of N-terminal acetyltransferases. Comput Struct Biotechnol J 2020; 18:532-547. [PMID: 32206212 PMCID: PMC7078549 DOI: 10.1016/j.csbj.2020.02.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 02/14/2020] [Accepted: 02/25/2020] [Indexed: 12/15/2022] Open
Abstract
N-terminal acetyltransferases (NATs) belong to the superfamily of acetyltransferases. They are enzymes catalysing the transfer of an acetyl group from acetyl coenzyme A to the N-terminus of polypeptide chains. N-terminal acetylation is one of the most common protein modifications. To date, not much is known on the molecular basis for the exclusive substrate specificity of NATs. All NATs share a common fold called GNAT. A characteristic of NATs is the β6β7 hairpin loop covering the active site and forming with the α1α2 loop a narrow tunnel surrounding the catalytic site in which cofactor and polypeptide meet and exchange an acetyl group. We investigated the dynamics-function relationships of all available structures of NATs covering the three domains of Life. Using an elastic network model and normal mode analysis, we found a common dynamics pattern conserved through the GNAT fold; a rigid V-shaped groove formed by the β4 and β5 strands and splitting the fold in two dynamical subdomains. Loops α1α2, β3β4 and β6β7 all show clear displacements in the low frequency normal modes. We characterized the mobility of the loops and show that even limited conformational changes of the loops along the low-frequency modes are able to significantly change the size and shape of the ligand binding sites. Based on the fact that these movements are present in most low-frequency modes, and common to all NATs, we suggest that the α1α2 and β6β7 loops may regulate ligand uptake and the release of the acetylated polypeptide.
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Affiliation(s)
- Angèle Abboud
- Department of Informatics, University of Bergen, Bergen, Norway
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
| | - Pierre Bédoucha
- Department of Informatics, University of Bergen, Bergen, Norway
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
| | - Jan Byška
- Department of Informatics, University of Bergen, Bergen, Norway
- Faculty of Informatics, Masaryk University, Brno, Czech Republic
| | - Thomas Arnesen
- Department of Biological Sciences, University of Bergen, Bergen, Norway
- Department of Biomedicine, University of Bergen, Bergen, Norway
- Department of Surgery, Haukeland University Hospital, Bergen, Norway
| | - Nathalie Reuter
- Computational Biology Unit, Department of Informatics, University of Bergen, Bergen, Norway
- Department of Chemistry, University of Bergen, Bergen, Norway
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6
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Yang Z, Meng Y, Zhao Q, Cheng B, Xu P, Yang C. Critical Functions of Region 1-67 and Helix XIII in Retaining the Active Structure of NhaD Antiporter in Halomonas sp. Y2. Front Microbiol 2018; 9:831. [PMID: 29770128 PMCID: PMC5942162 DOI: 10.3389/fmicb.2018.00831] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 04/11/2018] [Indexed: 11/13/2022] Open
Abstract
NhaD-type antiporters are mainly distributed in various Proteobacteria, especially in marine microorganisms and human pathogens. This distribution as well as the pathogenic properties of these strains suggest that these antiporters contribute to the regulation of high osmoregulation and are potential drug targets. Two NhaD homologs, NhaD1 and NhaD2, from the halotolerant and alkaliphilic Halomonas sp. Y2 exhibits similar, high in vitro activity, but remarkably different in vivo functions. To search for critical domains or residues involved in these differences of physiological functions, various chimeras composed of NhaD1 and NhaD2 segments were generated. Two regions at residues 1–67 and 464–492 were found to be responsible for the robust in vivo function of NhaD2, and region 464–492 is also crucial to the pH response of the antiporter. In particular, the completely abolished activity of KNabc/N463r, highly recovered activity while very weakly recovered ion resistance of the KNabc/N463r-C7 chimera, suggested that transmembrane helix (TM) XIII is crucial for the robust ion resistance of NhaD2. Using site-directed mutagenesis, seven hydrophobic residues in TM XIII were identified as key residues for the ion translocation of NhaD2. Compared with the fluorescence resonance energy transfer (FRET) profile in the wild-type NhaD2, the reduced FRET efficiency of N463r chimeras provided solid evidence for conformational changes in the N463r fusion protein and consequently verified the structural functions of TM XIII in the pH activation and physiological functions of NhaD2.
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Affiliation(s)
- Zhou Yang
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Jinan, China
| | - Yiwei Meng
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Jinan, China
| | - Qi Zhao
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Jinan, China
| | - Bin Cheng
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Jinan, China
| | - Ping Xu
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Jinan, China
| | - Chunyu Yang
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Jinan, China
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7
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Ligand-induced conformational dynamics of the Escherichia coli Na +/H + antiporter NhaA revealed by hydrogen/deuterium exchange mass spectrometry. Proc Natl Acad Sci U S A 2017; 114:11691-11696. [PMID: 29078272 DOI: 10.1073/pnas.1703422114] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Na+/H+ antiporters comprise a family of membrane proteins evolutionarily conserved in all kingdoms of life and play an essential role in cellular ion homeostasis. The NhaA crystal structure of Escherichia coli has become the paradigm for this class of secondary active transporters. However, structural data are only available at low pH, where NhaA is inactive. Here, we adapted hydrogen/deuterium-exchange mass spectrometry (HDX-MS) to analyze conformational changes in NhaA upon Li+ binding at physiological pH. Our analysis revealed a global conformational change in NhaA with two sets of movements around an immobile binding site. Based on these results, we propose a model for the ion translocation mechanism that explains previously controversial data for this antiporter. Furthermore, these findings contribute to our understanding of related human transporters that have been linked to various diseases.
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8
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Mulligan C, Mindell JA. Pinning Down the Mechanism of Transport: Probing the Structure and Function of Transporters Using Cysteine Cross-Linking and Site-Specific Labeling. Methods Enzymol 2017; 594:165-202. [PMID: 28779840 DOI: 10.1016/bs.mie.2017.05.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Transporters are crucial in a number of cellular functions, including nutrient uptake, cell signaling, and toxin removal. As such, transporters are important drug targets and their malfunction is related to several disease states. Treating transporter-related diseases and developing pharmaceuticals targeting transporters require an understanding of their mechanism. Achieving a detailed understanding of transporter mechanism depends on an integrative approach involving structural and computational approaches as well as biochemical and biophysical methodologies. Many of the elements of this toolkit exploit the unique and useful chemistry of the amino acid cysteine. Cysteine offers researchers a specific molecular handle with which to precisely modify the protein, which enables the introduction of biophysical probes to assess ligand binding and the conformational ensemble of the transporter, to topologically map transporters and validate structural models, and to assess essential conformational changes. Here, we summarize several uses for cysteine-based labeling and cross-linking in the pursuit of understanding transporter mechanism, the common cysteine-reactive reagents used to probe transporter mechanism, and strategies that can be used to confirm cysteine cross-link formation. In addition, we provide methodological considerations for each approach and a detailed procedure for the cross-linking of introduced cysteines, and a simple screening method to assess cross-link formation.
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Affiliation(s)
| | - Joseph A Mindell
- Membrane Transport Biophysics Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, United States
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9
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Călinescu O, Dwivedi M, Patiño-Ruiz M, Padan E, Fendler K. Lysine 300 is essential for stability but not for electrogenic transport of the Escherichia coli NhaA Na +/H + antiporter. J Biol Chem 2017; 292:7932-7941. [PMID: 28330875 PMCID: PMC5427271 DOI: 10.1074/jbc.m117.778175] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 03/09/2017] [Indexed: 11/06/2022] Open
Abstract
Na+/H+ antiporters are located in the cytoplasmic and intracellular membranes and play crucial roles in regulating intracellular pH, Na+, and volume. The NhaA antiporter of Escherichia coli is the best studied member of the Na+/H+ exchanger family and a model system for all related Na+/H+ exchangers, including eukaryotic representatives. Several amino acid residues are important for the transport activity of NhaA, including Lys-300, a residue that has recently been proposed to carry one of the two H+ ions that NhaA exchanges for one Na+ ion during one transport cycle. Here, we sought to characterize the effects of mutating Lys-300 of NhaA to amino acid residues containing side chains of different polarity and length (i.e. Ala, Arg, Cys, His, Glu, and Leu) on transporter stability and function. Salt resistance assays, acridine-orange fluorescence dequenching, solid supported membrane-based electrophysiology, and differential scanning fluorometry were used to characterize Na+ and H+ transport, charge translocation, and thermal stability of the different variants. These studies revealed that NhaA could still perform electrogenic Na+/H+ exchange even in the absence of a protonatable residue at the Lys-300 position. However, all mutants displayed lower thermal stability and reduced ion transport activity compared with the wild-type enzyme, indicating the critical importance of Lys-300 for optimal NhaA structural stability and function. On the basis of these experimental data, we propose a tentative mechanism integrating the functional and structural role of Lys-300.
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Affiliation(s)
- Octavian Călinescu
- From the Max-Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany
- the "Carol Davila" University of Medicine and Pharmacy, 050474 Bucharest, Romania, and
| | - Manish Dwivedi
- the Institute of Life Sciences, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Miyer Patiño-Ruiz
- From the Max-Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany
| | - Etana Padan
- the Institute of Life Sciences, Hebrew University of Jerusalem, 91904 Jerusalem, Israel
| | - Klaus Fendler
- From the Max-Planck Institute of Biophysics, 60438 Frankfurt am Main, Germany,
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10
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The bacterial dicarboxylate transporter VcINDY uses a two-domain elevator-type mechanism. Nat Struct Mol Biol 2016; 23:256-63. [PMID: 26828963 PMCID: PMC5215794 DOI: 10.1038/nsmb.3166] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 12/30/2015] [Indexed: 11/11/2022]
Abstract
Secondary transporters use alternating access mechanisms to couple uphill substrate movement to downhill ion flux. Most known transporters utilize a “rocking bundle” motion, where the protein moves around an immobile substrate binding site. However, the glutamate transporter homolog, GltPh, translocates its substrate binding site vertically across the membrane, an “elevator” mechanism. Here, we used the “repeat swap” approach to computationally predict the outward-facing state of the Na+/succinate transporter VcINDY, from Vibrio cholerae. Our model predicts a substantial “elevator”-like movement of vcINDY’s substrate binding site, with a vertical translation of ~15 Å and a rotation of ~43°; multiple disulfide crosslinks which completely inhibit transport provide experimental confirmation and demonstrate that such movement is essential. In contrast, crosslinks across the VcINDY dimer interface preserve transport, revealing an absence of large scale coupling between protomers.
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11
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Abstract
Symmetry is a common feature among natural systems, including protein structures. A strong propensity toward symmetric architectures has long been recognized for water-soluble proteins, and this propensity has been rationalized from an evolutionary standpoint. Proteins residing in cellular membranes, however, have traditionally been less amenable to structural studies, and thus the prevalence and significance of symmetry in this important class of molecules is not as well understood. In the past two decades, researchers have made great strides in this area, and these advances have provided exciting insights into the range of architectures adopted by membrane proteins. These structural studies have revealed a similarly strong bias toward symmetric arrangements, which were often unexpected and which occurred despite the restrictions imposed by the membrane environment on the possible symmetry groups. Moreover, membrane proteins disproportionately contain internal structural repeats resulting from duplication and fusion of smaller segments. This article discusses the types and origins of symmetry in membrane proteins and the implications of symmetry for protein function.
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Affiliation(s)
- Lucy R Forrest
- Computational Structural Biology Group, Porter Neuroscience Center, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20852;
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12
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Sodium-Proton (Na+/H+) Antiporters: Properties and Roles in Health and Disease. Met Ions Life Sci 2016; 16:391-458. [DOI: 10.1007/978-3-319-21756-7_12] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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13
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14
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NhaA antiporter functions using 10 helices, and an additional 2 contribute to assembly/stability. Proc Natl Acad Sci U S A 2015; 112:E5575-82. [PMID: 26417087 DOI: 10.1073/pnas.1510964112] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The Escherichia coli Na(+)/H(+) antiporter (Ec-NhaA) is the best-characterized of all pH-regulated Na(+)/H(+) exchangers that control cellular Na(+) and H(+) homeostasis. Ec-NhaA has 12 helices, 2 of which (VI and VII) are absent from other antiporters that share the Ec-NhaA structural fold. This α-hairpin is located in the dimer interface of the Ec-NhaA homodimer together with a β-sheet. Here we examine computationally and experimentally the role of the α-hairpin in the stability, dimerization, transport, and pH regulation of Ec-NhaA. Evolutionary analysis (ConSurf) indicates that the VI-VII helical hairpin is much less conserved than the remaining transmembrane region. Moreover, normal mode analysis also shows that intact NhaA and a variant, deleted of the α-hairpin, share similar dynamics, suggesting that the structure may be dispensable. Thus, two truncated Ec-NhaA mutants were constructed, one deleted of the α-hairpin and another also lacking the β-sheet. The mutants were studied at physiological pH in the membrane and in detergent micelles. The findings demonstrate that the truncated mutants retain significant activity and regulatory properties but are defective in the assembly/stability of the Ec-NhaA dimer.
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15
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Vergara-Jaque A, Fenollar-Ferrer C, Kaufmann D, Forrest LR. Repeat-swap homology modeling of secondary active transporters: updated protocol and prediction of elevator-type mechanisms. Front Pharmacol 2015; 6:183. [PMID: 26388773 PMCID: PMC4560100 DOI: 10.3389/fphar.2015.00183] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 08/13/2015] [Indexed: 12/04/2022] Open
Abstract
Secondary active transporters are critical for neurotransmitter clearance and recycling during synaptic transmission and uptake of nutrients. These proteins mediate the movement of solutes against their concentration gradients, by using the energy released in the movement of ions down pre-existing concentration gradients. To achieve this, transporters conform to the so-called alternating-access hypothesis, whereby the protein adopts at least two conformations in which the substrate binding sites are exposed to one or other side of the membrane, but not both simultaneously. Structures of a bacterial homolog of neuronal glutamate transporters, GltPh, in several different conformational states have revealed that the protein structure is asymmetric in the outward- and inward-open states, and that the conformational change connecting them involves a elevator-like movement of a substrate binding domain across the membrane. The structural asymmetry is created by inverted-topology repeats, i.e., structural repeats with similar overall folds whose transmembrane topologies are related to each other by two-fold pseudo-symmetry around an axis parallel to the membrane plane. Inverted repeats have been found in around three-quarters of secondary transporter folds. Moreover, the (a)symmetry of these systems has been successfully used as a bioinformatic tool, called “repeat-swap modeling” to predict structural models of a transporter in one conformation using the known structure of the transporter in the complementary conformation as a template. Here, we describe an updated repeat-swap homology modeling protocol, and calibrate the accuracy of the method using GltPh, for which both inward- and outward-facing conformations are known. We then apply this repeat-swap homology modeling procedure to a concentrative nucleoside transporter, VcCNT, which has a three-dimensional arrangement related to that of GltPh. The repeat-swapped model of VcCNT predicts that nucleoside transport also occurs via an elevator-like mechanism.
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Affiliation(s)
- Ariela Vergara-Jaque
- Computational Structural Biology Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke - National Institutes of Health, Bethesda, MD USA
| | - Cristina Fenollar-Ferrer
- Computational Structural Biology Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke - National Institutes of Health, Bethesda, MD USA
| | - Desirée Kaufmann
- Computational Structural Biology Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke - National Institutes of Health, Bethesda, MD USA
| | - Lucy R Forrest
- Computational Structural Biology Section, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke - National Institutes of Health, Bethesda, MD USA
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16
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Kinclova-Zimmermannova O, Falson P, Cmunt D, Sychrova H. A Hydrophobic Filter Confers the Cation Selectivity of Zygosaccharomyces rouxii Plasma-Membrane Na+/H+ Antiporter. J Mol Biol 2015; 427:1681-94. [DOI: 10.1016/j.jmb.2015.02.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 02/10/2015] [Accepted: 02/11/2015] [Indexed: 10/24/2022]
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17
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Fowler PW, Orwick-Rydmark M, Radestock S, Solcan N, Dijkman PM, Lyons JA, Kwok J, Caffrey M, Watts A, Forrest LR, Newstead S. Gating topology of the proton-coupled oligopeptide symporters. Structure 2015; 23:290-301. [PMID: 25651061 PMCID: PMC4321885 DOI: 10.1016/j.str.2014.12.012] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 11/21/2014] [Accepted: 12/03/2014] [Indexed: 01/10/2023]
Abstract
Proton-coupled oligopeptide transporters belong to the major facilitator superfamily (MFS) of membrane transporters. Recent crystal structures suggest the MFS fold facilitates transport through rearrangement of their two six-helix bundles around a central ligand binding site; how this is achieved, however, is poorly understood. Using modeling, molecular dynamics, crystallography, functional assays, and site-directed spin labeling combined with double electron-electron resonance (DEER) spectroscopy, we present a detailed study of the transport dynamics of two bacterial oligopeptide transporters, PepTSo and PepTSt. Our results identify several salt bridges that stabilize outward-facing conformations and we show that, for all the current structures of MFS transporters, the first two helices of each of the four inverted-topology repeat units form half of either the periplasmic or cytoplasmic gate and that these function cooperatively in a scissor-like motion to control access to the peptide binding site during transport.
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Affiliation(s)
- Philip W Fowler
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
| | | | - Sebastian Radestock
- Max Planck Institute of Biophysics, Max-von-Laue-Straße 3, Frankfurt am Main, Germany
| | - Nicolae Solcan
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Patricia M Dijkman
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Joseph A Lyons
- School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland
| | - Jane Kwok
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Martin Caffrey
- School of Biochemistry and Immunology, Trinity College Dublin, Dublin 2, Ireland
| | - Anthony Watts
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Lucy R Forrest
- Max Planck Institute of Biophysics, Max-von-Laue-Straße 3, Frankfurt am Main, Germany
| | - Simon Newstead
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
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18
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Wöhlert D, Kühlbrandt W, Yildiz O. Structure and substrate ion binding in the sodium/proton antiporter PaNhaP. eLife 2014; 3:e03579. [PMID: 25426802 PMCID: PMC4381880 DOI: 10.7554/elife.03579] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 11/25/2014] [Indexed: 11/29/2022] Open
Abstract
Sodium/proton antiporters maintain intracellular pH and sodium levels. Detailed
structures of antiporters with bound substrate ions are essential for understanding
how they work. We have resolved the substrate ion in the dimeric, electroneutral
sodium/proton antiporter PaNhaP from Pyrococcus abyssi at 3.2
Å, and have determined its structure in two different conformations at pH 8 and
pH 4. The ion is coordinated by three acidic sidechains, a water molecule, a serine
and a main-chain carbonyl in the unwound stretch of trans-membrane helix 5 at the
deepest point of a negatively charged cytoplasmic funnel. A second narrow polar
channel may facilitate proton uptake from the cytoplasm. Transport activity of PaNhaP
is cooperative at pH 6 but not at pH 5. Cooperativity is due to pH-dependent
allosteric coupling of protomers through two histidines at the dimer interface.
Combined with comprehensive transport studies, the structures of PaNhaP offer unique
new insights into the transport mechanism of sodium/proton antiporters. DOI:http://dx.doi.org/10.7554/eLife.03579.001 Although the membrane that surrounds a cell is effective at separating the inside of
a cell from the outside environment, certain molecules must enter or leave the cell
for it to work correctly. One way this transport can occur is via proteins embedded
in the cell membrane, called transporters. Transporters that are found in all organisms include the sodium/proton antiporters,
which exchange protons from inside the cell with sodium ions from outside. However,
exactly how the antiporter works was unknown. Previous work suggested that the structure and activity of the sodium/proton
antiporter changes as the acidity of its environment changes, but the precise details
of how this occurs were unclear. Wöhlert et al. have now crystallised a
sodium/proton antiporter from a single-celled organism called Pyrococcus
abyssi, a species of archaea that has been found living in hydrothermal
vents deep in the Pacific Ocean. The structures the protein takes on in different
functional states were then deduced from these crystals using a technique called
X-ray crystallography. Using heavy thallium ions instead of sodium ions, which are
less visible to X-rays, Wöhlert et al. found the site in the antiporter where
the transported ion binds as it moves through the membrane. The antiporter has a funnel-shaped cavity that faces inwards (into the cell) in both
acidic and alkaline conditions, although a second narrow channel that is open in
alkaline conditions is blocked in acidic conditions by small protein rearrangements.
Wöhlert et al. suggest that the differences between both structures explain how
the antiporter tunes its ability to bind to the ions it transports. Wöhlert et al. further measured the activity of the antiporter and observed that
the transport of ions was most rapid under slightly acidic conditions. In more acidic
conditions, the sodium ion cannot bind to the antiporter, and in an alkaline
environment, the sodium ions bind too strongly to the antiporter; in both cases, the
ions cannot be transported. Comparing the findings presented here with separate work that uncovers the structure
of the sodium/proton antiporter in a different species of archaea revealed very
similar structures. Related transporters are also found in mammals, and defects in
these transporters can lead to problems with the heart and kidneys. A better
understanding of the sodium/proton antiporter structure could therefore help to
develop new treatments for these conditions. DOI:http://dx.doi.org/10.7554/eLife.03579.002
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Affiliation(s)
- David Wöhlert
- Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Werner Kühlbrandt
- Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Ozkan Yildiz
- Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
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19
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Abstract
We examined substrate-induced conformational changes in MjNhaP1, an archaeal electroneutral Na(+)/H(+)-antiporter resembling the human antiporter NHE1, by electron crystallography of 2D crystals in a range of physiological pH and Na(+) conditions. In the absence of sodium, changes in pH had no major effect. By contrast, changes in Na(+) concentration caused a marked conformational change that was largely pH-independent. Crystallographically determined, apparent dissociation constants indicated ∼10-fold stronger Na(+) binding at pH 8 than at pH 4, consistent with substrate competition for a common ion-binding site. Projection difference maps indicated helix movements by about 2 Å in the 6-helix bundle region of MjNhaP1 that is thought to contain the ion translocation site. We propose that these movements convert the antiporter from the proton-bound, outward-open state to the Na(+)-bound, inward-open state. Oscillation between the two states would result in rapid Na(+)/H(+) antiport. DOI: http://dx.doi.org/10.7554/eLife.01412.001.
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Affiliation(s)
- Cristina Paulino
- Department of Structural Biology, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
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20
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Hendus-Altenburger R, Kragelund BB, Pedersen SF. Structural dynamics and regulation of the mammalian SLC9A family of Na⁺/H⁺ exchangers. CURRENT TOPICS IN MEMBRANES 2014; 73:69-148. [PMID: 24745981 DOI: 10.1016/b978-0-12-800223-0.00002-5] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Mammalian Na⁺/H⁺ exchangers of the SLC9A family are widely expressed and involved in numerous essential physiological processes. Their primary function is to mediate the 1:1 exchange of Na⁺ for H⁺ across the membrane in which they reside, and they play central roles in regulation of body, cellular, and organellar pH. Their function is tightly regulated through mechanisms involving interactions with multiple protein and lipid-binding partners, phosphorylations, and other posttranslational modifications. Biochemical and mutational analyses indicate that the SLC9As have a short intracellular N-terminus, 12 transmembrane (TM) helices necessary and sufficient for ion transport, and a C-terminal cytoplasmic tail region with essential regulatory roles. No high-resolution structures of the SLC9As exist; however, models based on crystal structures of the bacterial NhaAs support the 12 TM organization and suggest that TMIV and XI may form a central part of the ion-translocation pathway, whereas pH sensing may involve TMII, TMIX, and several intracellular loops. Similar to most ion transporters studied, SLC9As likely exist as coupled dimers in the membrane, and this appears to be important for the well-studied cooperativity of H⁺ binding. The aim of this work is to summarize and critically discuss the currently available evidence on the structural dynamics, regulation, and binding partner interactions of SLC9As, focusing in particular on the most widely studied isoform, SLC9A1/NHE1. Further, novel bioinformatic and structural analyses are provided that to some extent challenge the existing paradigm on how ions are transported by mammalian SLC9As.
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Affiliation(s)
- Ruth Hendus-Altenburger
- Section for Biomolecular Sciences, Department of Biology, University of Copenhagen, Copenhagen, Denmark; Section for Cell and Developmental Biology, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Birthe B Kragelund
- Section for Biomolecular Sciences, Department of Biology, University of Copenhagen, Copenhagen, Denmark
| | - Stine Falsig Pedersen
- Section for Cell and Developmental Biology, Department of Biology, University of Copenhagen, Copenhagen, Denmark.
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21
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Functional and structural dynamics of NhaA, a prototype for Na(+) and H(+) antiporters, which are responsible for Na(+) and H(+) homeostasis in cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2013; 1837:1047-62. [PMID: 24361841 DOI: 10.1016/j.bbabio.2013.12.007] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 12/09/2013] [Accepted: 12/13/2013] [Indexed: 01/14/2023]
Abstract
The crystal structure of down-regulated NhaA crystallized at acidic pH4 [21] has provided the first structural insights into the antiport mechanism and pH regulation of a Na(+)/H(+) antiporter [22]. On the basis of the NhaA crystal structure [21] and experimental data (reviewed in [2,22,38] we have suggested that NhaA is organized into two functional regions: (i) a cluster of amino acids responsible for pH regulation (ii) a catalytic region at the middle of the TM IV/XI assembly, with its unique antiparallel unfolded regions that cross each other forming a delicate electrostatic balance in the middle of the membrane. This unique structure contributes to the cation binding site and allows the rapid conformational changes expected for NhaA. Extended chains interrupting helices appear now a common feature for ion binding in transporters. However the NhaA fold is unique and shared by ASBTNM [30] and NapA [29]. Computation [13], electrophysiology [69] combined with biochemistry [33,47] have provided intriguing models for the mechanism of NhaA. However, the conformational changes and the residues involved have not yet been fully identified. Another issue which is still enigma is how energy is transduced "in this 'nano-machine.'" We expect that an integrative approach will reveal the residues that are crucial for NhaA activity and regulation, as well as elucidate the pHand ligand-induced conformational changes and their dynamics. Ultimately, integrative results will shed light on the mechanism of activity and pH regulation of NhaA, a prototype of the CPA2 family of transporters. This article is part of a Special Issue entitled: 18th European Bioenergetic Conference.
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22
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Lee C, Kang HJ, von Ballmoos C, Newstead S, Uzdavinys P, Dotson DL, Iwata S, Beckstein O, Cameron AD, Drew D. A two-domain elevator mechanism for sodium/proton antiport. Nature 2013; 501:573-7. [PMID: 23995679 PMCID: PMC3914025 DOI: 10.1038/nature12484] [Citation(s) in RCA: 180] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 07/17/2013] [Indexed: 12/11/2022]
Abstract
Sodium/proton (Na+/H+) antiporters, located at the plasma membrane in every cell, are vital for cell homeostasis1. In humans, their dysfunction has been linked to diseases, such as, hypertension, heart failure and epilepsy and they are well-established drug targets2. The best understood model system for Na+/H+ antiport is NhaA from Escherichia coli1,3, where both EM and crystal structures are available4-6. NhaA is made up of two distinct domains, a Core domain and a Dimerisation domain. In the NhaA crystal structure a cavity is located between the two domains providing access to the ion-binding site from the inward-facing surface of the protein1,4. Like many Na+/H+ antiporters, the activity of NhaA is regulated by pH, only becoming active above pH 6.5, where a conformational change is thought to occur7. To date, the only reported NhaA crystal structure is of the low pH inactivated form4. Here, we describe the active-state structure of a Na+/H+ antiporter, NapA from Thermus thermophilus at 3 Å resolution, solved from crystals grown at pH 7.8. In the NapA structure, the Core and Dimerisation domains are in different positions to those seen in NhaA and a negatively charged cavity has now opened to the outside. The extracellular cavity allows access to a strictly conserved aspartate residue thought to directly coordinate ion-binding1,8,9, a role supported here by molecular dynamics simulations. To alternate access to this ion-binding site, however, requires a surprisingly large rotation of the Core domain, some 20° against the Dimerisation interface. We conclude that despite their fast transport rates of up to 1500 ions/sec3, Na+/H+ antiporters operate by a two-domain rocking bundle model, revealing themes relevant to secondary-active transporters in general.
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Affiliation(s)
- Chiara Lee
- Division of Molecular Biosciences, Imperial College London, London SW7 2AZ, UK
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23
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Affiliation(s)
- Lucy R Forrest
- Computational Structural Biology Group, Max Planck Institute of Biophysics, Max-von-Laue-Strasse 3, 60438 Frankfurt am Main, Germany.
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24
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Rimon A, Kozachkov-Magrisso L, Padan E. The Unwound Portion Dividing Helix IV of NhaA Undergoes a Conformational Change at Physiological pH and Lines the Cation Passage. Biochemistry 2012; 51:9560-9. [DOI: 10.1021/bi301030x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Abraham Rimon
- Department
of Biological Chemistry, Alexander Silberman
Institute of Life Sciences, Hebrew University, 91904 Jerusalem, Israel
| | - Lena Kozachkov-Magrisso
- Department
of Biological Chemistry, Alexander Silberman
Institute of Life Sciences, Hebrew University, 91904 Jerusalem, Israel
| | - Etana Padan
- Department
of Biological Chemistry, Alexander Silberman
Institute of Life Sciences, Hebrew University, 91904 Jerusalem, Israel
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25
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Maes M, Rimon A, Kozachkov-Magrisso L, Friedler A, Padan E. Revealing the ligand binding site of NhaA Na+/H+ antiporter and its pH dependence. J Biol Chem 2012; 287:38150-7. [PMID: 22915592 DOI: 10.1074/jbc.m112.391128] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
pH and Na(+) homeostasis in all cells requires Na(+)/H(+) antiporters. In most cases, their activity is tightly pH-regulated. NhaA, the main antiporter of Escherichia coli, has homologues in all biological kingdoms. The crystal structure of NhaA provided insights into the mechanism of action and pH regulation of an antiporter. However, the active site of NhaA remained elusive because neither Na(+) nor Li(+), the NhaA ligands, were observed in the structure. Using isothermal titration calorimetry, we show that purified NhaA binds Li(+) in detergent micelles. This interaction is driven by an increase in enthalpy (ΔH of -8000 ± 300 cal/mol and ΔS of -15.2 cal/mol/degree at 283 K), involves a single binding site per NhaA molecule, and is highly specific and drastically dependent on pH; Li(+) binding was observed only at pH 8.5. Combining mutational analysis with the isothermal titration calorimetry measurements revealed that Asp-163, Asp-164, Thr-132, and Asp-133 form the Li(+) binding site, whereas Lys-300 plays an important role in pH regulation of the antiporter.
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Affiliation(s)
- Michal Maes
- Institute of Chemistry, Alexander Silberman Institute of Life Sciences, Faculty of Sciences, Hebrew University of Jerusalem, Safra Campus, Givat Ram, Jerusalem 91904, Israel
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26
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Islam ST, Fieldhouse RJ, Anderson EM, Taylor VL, Keates RAB, Ford RC, Lam JS. A cationic lumen in the Wzx flippase mediates anionic O-antigen subunit translocation in Pseudomonas aeruginosa PAO1. Mol Microbiol 2012; 84:1165-76. [PMID: 22554073 PMCID: PMC3412221 DOI: 10.1111/j.1365-2958.2012.08084.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Heteropolymeric B-band O-antigen (O-Ag) biosynthesis in Pseudomonas aeruginosa PAO1 follows the Wzy-dependent pathway, beginning with translocation of undecaprenyl pyrophosphate-linked anionic O-Ag subunits (O units) from the inner to the outer leaflets of the inner membrane (IM). This translocation is mediated by the integral IM flippase Wzx. Through experimentally based and unbiased topological mapping, our group previously observed that Wzx possesses many charged and aromatic amino acid residues within its 12 transmembrane segments (TMS). Herein, site-directed mutagenesis targeting 102 residues was carried out on the TMS and loops of Wzx, followed by assessment of each construct's ability to restore B-band O-Ag production, identifying eight residues important for flippase function. The importance of various charged and aromatic residues was highlighted, predominantly within the TMS of the protein, revealing functional ‘hotspots’ within the flippase, particularly within TMS2 and TMS8. Construction of a tertiary structure homology model for Wzx indicated that TMS2 and TMS8 line a central cationic lumen. This is the first report to describe a charged flippase lumen for mediating anionic O-unit translocation across the hydrophobic IM.
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Affiliation(s)
- Salim T Islam
- Department of Molecular and Cellular Biology Biophysics Interdepartmental Group, University of Guelph, Guelph, ON N1G 2W1, Canada
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