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Kuhn BT, Zöller J, Zimmermann I, Gemeinhardt T, Özkul DH, Langer JD, Seeger MA, Geertsma ER. Interdomain-linkers control conformational transitions in the SLC23 elevator transporter UraA. Nat Commun 2024; 15:7518. [PMID: 39209842 PMCID: PMC11362169 DOI: 10.1038/s41467-024-51814-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 08/16/2024] [Indexed: 09/04/2024] Open
Abstract
Uptake of nucleobases and ascorbate is an essential process in all living organisms mediated by SLC23 transport proteins. These transmembrane carriers operate via the elevator alternating-access mechanism, and are composed of two rigid domains whose relative motion drives transport. The lack of large conformational changes within these domains suggests that the interdomain-linkers act as flexible tethers. Here, we show that interdomain-linkers are not mere tethers, but have a key regulatory role in dictating the conformational space of the transporter and defining the rotation axis of the mobile transport domain. By resolving a wide inward-open conformation of the SLC23 elevator transporter UraA and combining biochemical studies using a synthetic nanobody as conformational probe with hydrogen-deuterium exchange mass spectrometry, we demonstrate that interdomain-linkers control the function of transport proteins by influencing substrate affinity and transport rate. These findings open the possibility to allosterically modulate the activity of elevator proteins by targeting their linkers.
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Affiliation(s)
- Benedikt T Kuhn
- Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt am Main, Germany
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - Jonathan Zöller
- Proteomics, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
| | - Iwan Zimmermann
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Tim Gemeinhardt
- Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Dogukan H Özkul
- Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Julian D Langer
- Proteomics, Max Planck Institute of Biophysics, Frankfurt am Main, Germany
- Proteomics, Max Planck Institute for Brain Research, Frankfurt am Main, Germany
| | - Markus A Seeger
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Eric R Geertsma
- Institute of Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt am Main, Germany.
- Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany.
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2
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Lee KJ, Lee YM, Yang SB, Lee JH, Kim HR, Lim JH, Park J. A novel chemically engineered multifunctional statin conjugate as self-assembled nanoparticles inhibiting bile acid transporters. J Control Release 2024; 372:885-900. [PMID: 38971425 DOI: 10.1016/j.jconrel.2024.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 07/01/2024] [Accepted: 07/03/2024] [Indexed: 07/08/2024]
Abstract
Statins are widely used to treat hyperlipidemia; however, their mechanism-inhibiting cholesterol production without promoting its utilization-causes problems, such as inducing diabetes. In our research, we develop, for the first time, a chemically engineered statin conjugate that not only inhibits cholesterol production but also enhances its consumption through its multifunctional properties. The novel rosuvastatin (RO) and ursodeoxycholic acid (UDCA) conjugate (ROUA) is designed to bind to and inhibit the core of the apical sodium-dependent bile acid transporter (ASBT), effectively blocking ASBT's function in the small intestine, maintaining the effect of rosuvastatin. Consequently, ROUA not only preserves the cholesterol-lowering function of statins but also prevents the reabsorption of bile acids, thereby increasing cholesterol consumption. Additionally, ROUA's ability to self-assemble into nanoparticles in saline-attributable to its multiple hydroxyl groups and hydrophobic nature-suggests its potential for a prolonged presence in the body. The oral administration of ROUA nanoparticles in animal models using a high-fat or high-fat/high-fructose diet shows remarkable therapeutic efficacy in fatty liver, with low systemic toxicity. This innovative self-assembling multifunctional molecule design approach, which boosts a variety of therapeutic effects while minimizing toxicity, offers a significant contribution to the advancement of drug development.
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Affiliation(s)
- Kyeong-Ju Lee
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju 27478, Republic of Korea
| | - Yoon-Mi Lee
- Department of Biomedical Chemistry, College of Biomedical & Health Science, Konkuk University, Chungju 27478, Republic of Korea
| | - Seong-Bin Yang
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju 27478, Republic of Korea
| | - Jun-Hyuck Lee
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju 27478, Republic of Korea
| | - Ha Rin Kim
- School of Medicine, Stanford University, Stanford, CA 94305, United States
| | - Ji-Hong Lim
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju 27478, Republic of Korea; Department of Biomedical Chemistry, College of Biomedical & Health Science, Konkuk University, Chungju 27478, Republic of Korea.
| | - Jooho Park
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju 27478, Republic of Korea; Department of Biomedical Chemistry, College of Biomedical & Health Science, Konkuk University, Chungju 27478, Republic of Korea.
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3
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Huang R, Dai M, Jiang S, Guo Z, Shi H. Chloroplast-localized PvBASS2 regulates salt tolerance in the C4 plant seashore paspalum. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024. [PMID: 39058753 DOI: 10.1111/tpj.16949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Revised: 07/03/2024] [Accepted: 07/16/2024] [Indexed: 07/28/2024]
Abstract
BILE ACID SODIUM SYMPORTER FAMILY PROTEIN 2 (BASS2) is localized within chloroplast membranes, facilitating the translocation of pyruvate and Na+ from the cytosol to the plastid, where pyruvate supports isopentenyl diphosphate (IPP) synthesis via the methylerythritol phosphate pathway in C3 plants. Nevertheless, the biological function of BASS2 in C4 plants has not been well defined. This study unveils a previously unidentified role of PvBASS2 in Na+ and pyruvate transport in seashore paspalum (Paspalum vaginatum), a halophytic C4 grass, indicating a specific cellular function within this plant species. Data showed that overexpression of PvBASS2 in seashore paspalum attenuated salt tolerance, whereas its RNAi lines exhibited enhanced salt resistance compared to wild-type plants, suggesting a negative regulatory role of PvBASS2 in seashore paspalum salt tolerance. The constitutive overexpression of PvBASS2 was also found to reduce salt tolerance in Arabidopsis. Further study revealed that PvBASS2 negatively regulates seashore paspalum salt tolerance, possibly due to elevated Na+/K+ ratio, disrupted chloroplast structure, and reduced photosynthetic efficiency following exposure to salinity. Importantly, our subsequent investigations revealed that modulation of PvBASS2 expression in seashore paspalum influenced carbon dioxide assimilation, intermediary metabolites of the tricarboxylic acid cycle, and enzymatic activities under salinity treatment, which in turn led to alterations in free amino acid concentrations. Thus, this study reveals a role for BASS2 in the C4 plant seashore paspalum and enhances our comprehension of salt stress responses in C4 plants.
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Affiliation(s)
- Risheng Huang
- Key Laboratory of State Forestry and Grassland Administration on Grass Germplasm Resources Innovation and Utilization in the Middle and Lower Reaches of the Yangtze River, College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Mengtong Dai
- Key Laboratory of State Forestry and Grassland Administration on Grass Germplasm Resources Innovation and Utilization in the Middle and Lower Reaches of the Yangtze River, College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Shouzhen Jiang
- Key Laboratory of State Forestry and Grassland Administration on Grass Germplasm Resources Innovation and Utilization in the Middle and Lower Reaches of the Yangtze River, College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Zhenfei Guo
- Key Laboratory of State Forestry and Grassland Administration on Grass Germplasm Resources Innovation and Utilization in the Middle and Lower Reaches of the Yangtze River, College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Haifan Shi
- Key Laboratory of State Forestry and Grassland Administration on Grass Germplasm Resources Innovation and Utilization in the Middle and Lower Reaches of the Yangtze River, College of Grassland Science, Nanjing Agricultural University, Nanjing, 210095, China
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4
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Sutton H, Sokol RJ, Kamath BM. IBAT inhibitors in pediatric cholestatic liver diseases: Transformation on the horizon? Hepatology 2024:01515467-990000000-00979. [PMID: 39052914 DOI: 10.1097/hep.0000000000001032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 07/08/2024] [Indexed: 07/27/2024]
Abstract
Historically, the therapeutic options available to hepatologists managing cholestasis have been limited. Apart from bile acid--binding resins and the choleretic ursodeoxycholic acid, the medical management of cholestasis in children has been predominately focused on managing the complications of cholestasis, namely pruritus, malnutrition, fat-soluble vitamin deficiencies, and portal hypertension. As such, invasive surgical procedures such as biliary diversion and liver transplantation may become the only options for progressive and unremitting cases of cholestasis. Particularly in the pediatric population, where debilitating pruritus is a common indication for a liver transplant, effective anti-cholestatic medications have the potential to prolong native liver survival without the need for biliary diversion. Ileal bile acid transporter (IBAT) inhibitors are a relatively new class of drugs which that target the ileal re-uptake of bile acids, thus interrupting the enterohepatic circulation and reducing the total bile acid pool size and exposure of the liver. Oral, minimally absorbed IBAT inhibitors have been demonstrated to reduce serum bile acid levels and pruritus with a minimal side effect profile in clinical trials in Alagille Ssyndrome and progressive familial intrahepatic cholestasis, leading to FDA and EMA approval. The indications for IBAT inhibitors will likely expand in the coming years as clinical trials in other adult and pediatric cholestatic conditions are ongoing. This review will summarize the published clinical and pre-clinical data on IBAT inhibitors and offer providers guidance on their practical use.
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Affiliation(s)
- Harry Sutton
- Division of Gastroenterology, Hepatology and Nutrition, The Hospital for Sick Children and the University of Toronto, Toronto, Ontario, Canada
| | - Ronald J Sokol
- Department of Pediatrics, Section of Pediatric Gastroenterology, Hepatology and Nutrition, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, Colorado, USA
| | - Binita M Kamath
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Children's Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
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5
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Lee DN, Yang SB, Kweon S, Lee JH, Lee KJ, Ryu Y, Shin DW, Kim YJ, Lee YK, Park J. Design and development of novel self-assembled catechol-modified bile acid conjugates as pH-responsive apical sodium-dependent bile acid transporter targeting nanoparticles. Biomaterials 2024; 308:122539. [PMID: 38552366 DOI: 10.1016/j.biomaterials.2024.122539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 02/21/2024] [Accepted: 03/18/2024] [Indexed: 05/03/2024]
Abstract
Catechol-based biomaterials demonstrate biocompatibility, making them suitable for a wide range of therapeutic applications when integrated into various molecular frameworks. However, the development of orally available catechol-based biomaterials has been hindered by significant pH variations and complex interactions in the gastrointestinal (GI) tract. In this study, we introduce a novel catechol-modified bile acid (CMBA), which is synthesized by anchoring the FDA-approved drug, ursodeoxycholic acid to the neurotransmitter dopamine. This modification could form a new apical sodium-dependent bile acid transporter (ASBT) inhibitor (ASBTi) due to the bile acid moiety. The computational analysis using the TRAnsient Pockets in Proteins (TRAPP) module, coupled with MD simulations, revealed that CMBA exhibits a strong binding affinity at residues 51-55 of ASBT with a low inhibitory constant (Ki) value. Notably, in slightly alkaline biological conditions, CMBA molecules self-assemble into carrier-free nanoparticles with an average size of 240.2 ± 44.2 nm, while maintaining their ability to bind with ASBT. When administered orally, CMBA accumulates in the ileum and liver over 24 h, exhibiting significant therapeutic effects on bile acid (BA) metabolism in a high-fat diet (HFD)-fed mouse model. This study underscores the therapeutic potential of the newly developed catechol-based, pH-responsive ASBT-inhibiting nanoparticles presenting a promising avenue for advancing therapy.
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Affiliation(s)
- Dong-Nyeong Lee
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Seong-Bin Yang
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Seho Kweon
- Department of Molecular Medicine and Biopharmaceutical Science, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, 08826, Republic of Korea; College of Pharmacy, Research Institute of Pharmaceutical Sciences, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Jun-Hyuck Lee
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Kyeong-Ju Lee
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Yeonsu Ryu
- Department of Biomedical Chemistry, College of Biomedical and Health Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Dong Wook Shin
- College of Biomedical and Health Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Young Jun Kim
- Department of Biomedical Chemistry, College of Biomedical and Health Science, Konkuk University, Chungju, 27478, Republic of Korea
| | - Yong-Kyu Lee
- Department of Green Bio Engineering, Graduate School, Korea National University of Transportation, Chungju, 27469, Republic of Korea.
| | - Jooho Park
- BK21 Program, Department of Applied Life Science, Konkuk University, Chungju, 27478, Republic of Korea; Department of Biomedical Chemistry, College of Biomedical and Health Science, Konkuk University, Chungju, 27478, Republic of Korea.
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6
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Hammes UZ, Pedersen BP. Structure and Function of Auxin Transporters. ANNUAL REVIEW OF PLANT BIOLOGY 2024; 75:185-209. [PMID: 38211951 DOI: 10.1146/annurev-arplant-070523-034109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Auxins, a group of central hormones in plant growth and development, are transported by a diverse range of transporters with distinct biochemical and structural properties. This review summarizes the current knowledge on all known auxin transporters with respect to their biochemical and biophysical properties and the methods used to characterize them. In particular, we focus on the recent advances that were made concerning the PIN-FORMED family of auxin exporters. Insights derived from solving their structures have improved our understanding of the auxin export process, and we discuss the current state of the art on PIN-mediated auxin transport, including the use of biophysical methods to examine their properties. Understanding the mechanisms of auxin transport is crucial for understanding plant growth and development, as well as for the development of more effective strategies for crop production and plant biotechnology.
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Affiliation(s)
- Ulrich Z Hammes
- School of Life Sciences, Plant Systems Biology, Technical University of Munich, Freising, Germany;
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7
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Ji Z, Wang R, Zhang M, Chen L, Wang Y, Hui J, Hao S, Lv B, Jiang Q, Cao Y. Genome-Wide Identification and Expression Analysis of BrBASS Genes in Brassica rapa Reveals Their Potential Roles in Abiotic Stress Tolerance. Curr Issues Mol Biol 2024; 46:6646-6664. [PMID: 39057038 PMCID: PMC11275500 DOI: 10.3390/cimb46070396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2024] [Revised: 06/15/2024] [Accepted: 06/25/2024] [Indexed: 07/28/2024] Open
Abstract
The bile acid sodium symporter (BASS) family plays an important role in transporting substances and coordinating plants' salt tolerance. However, the function of BASS in Brassica rapa has not yet been elucidated. In this study, eight BrBASS genes distributed on five chromosomes were identified that belonged to four subfamilies. Expression profile analysis showed that BrBASS7 was highly expressed in roots, whereas BrBASS4 was highly expressed in flowers. The promoter element analysis also identified several typical homeopathic elements involved in abiotic stress tolerance and stress-related hormonal responses. Notably, under salt stress, the expression of BrBASS2 was significantly upregulated; under osmotic stress, that of BrBASS4 increased and then decreased; and under cold stress, that of BrBASS7 generally declined. The protein-protein interaction analysis revealed that the BrBASS2 homologous gene AtBASS2 interacted with Nhd1 (N-mediated heading date-1) to alleviate salt stress in plants, while the BrBASS4 homologous gene AtBASS3 interacted with BLOS1 (biogenesis of lysosome-related organelles complex 1 subunit 1) via co-regulation with SNX1 (sorting nexin 1) to mitigate an unfavorable growing environment for roots. Further, Bra-miR396 (Bra-microRNA396) targeting BrBASS4 and BrBASS7 played a role in the plant response to osmotic and cold stress conditions, respectively. This research demonstrates that BrBASS2, BrBASS4, and BrBASS7 harbor great potential for regulating abiotic stresses. The findings will help advance the study of the functions of the BrBASS gene family.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Yunyun Cao
- College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271018, China; (Z.J.)
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8
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Lu X, Huang J. Molecular mechanisms of Na +-driven bile acid transport in human NTCP. Biophys J 2024; 123:1195-1210. [PMID: 38544409 PMCID: PMC11140467 DOI: 10.1016/j.bpj.2024.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 02/17/2024] [Accepted: 03/25/2024] [Indexed: 04/12/2024] Open
Abstract
Human Na+ taurocholate co-transporting protein (hNTCP) is a key bile salt transporter to maintain enterohepatic circulation and is responsible for the recognition of hepatitis B and D viruses. Despite landmark cryoelectron microscopy studies revealing open-pore and inward-facing states of hNTCP stabilized by antibodies, the transport mechanism remains largely unknown. To address this knowledge gap, we used molecular dynamics and enhanced sampling metadynamics simulations to elucidate the intrinsic mechanism of hNTCP-mediated taurocholate acid (TCA) transport driven by Na+ binding. We uncovered three TCA-binding modes, including one that closely matched the limited cryoelectron microscopy density observed in the open-pore hNTCP. We also captured several key hNTCP conformations in the substrate transport cycle, particularly including an outward-facing, substrate-bound state. Furthermore, we provided thermodynamic evidence supporting that changes in the Na+-binding state drive the TCA transport by exploiting the amphiphilic nature of the substrate and modulating the protein environment, thereby enabling the TCA molecule to flip through. Understanding these mechanistic details of Na+-driven bile acid transport may aid in the development of hNTCP-targeted therapies for liver diseases.
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Affiliation(s)
- Xiaoli Lu
- Westlake AI Therapeutics Laboratory, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang, China; Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, Zhejiang, China
| | - Jing Huang
- Westlake AI Therapeutics Laboratory, Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang, China; Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou, Zhejiang, China.
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9
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Yadav A, Kumar D, Dwivedi M. Site-directed mutagenesis at the Glu78 in Ec-NhaA transporter impacting ion exchange: a biophysical study. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2024; 53:193-203. [PMID: 38647543 DOI: 10.1007/s00249-024-01709-9] [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: 12/14/2023] [Revised: 03/24/2024] [Accepted: 03/27/2024] [Indexed: 04/25/2024]
Abstract
Na+/H+ antiporters facilitate the exchange of Na+ for H+ across the cytoplasmic membrane in prokaryotic and eukaryotic cells. These transporters are crucial to maintain the homeostasis of sodium ions, consequently pH, and volume of the cells. Therefore, sodium/proton antiporters are considered promising therapeutic targets in humans. The Na+/H+ antiporter in Escherichia coli (Ec-NhaA), a prototype of cation-proton antiporter (CPA) family, transports two protons and one sodium (or Li+) in opposite direction. Previous mutagenesis experiments on Ec-NhaA have proposed Asp164, Asp163, and Asp133 amino acids with the significant implication in functional and structural integrity and create site for ion-binding. However, the mechanism and the sites for the binding of the two protons remain unknown and controversial which could be critical for pH regulation. In this study, we have explored the role of Glu78 in the regulation of pH by Ec-NhaA. Although we have created various mutants, E78C has shown a considerable effect on the stoichiometry of NhaA and presented comparable phenotypes. The ITC experiment has shown the binding of ~ 5 protons in response to the transport of one lithium ion. The phenotype analysis on selective medium showed a significant expression compared to WT Ec-NhaA. This represents the importance of Glu78 in transporting the H+ across the membrane where a single mutation with Cys amino acid alters the number of H+ significantly maintaining the activity of the protein.
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Affiliation(s)
- Anuradha Yadav
- Amity Institute of Biotechnology, Amity University Uttar Pradesh, Lucknow, 226028, India
| | - Dinesh Kumar
- Center of Biomedical Research, SGPGIMS Campus, Lucknow, 226014, India
| | - Manish Dwivedi
- Amity Institute of Biotechnology, Amity University Uttar Pradesh, Lucknow, 226028, India.
- Research Cell, Amity University Uttar Pradesh, Lucknow, 226028, India.
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10
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Rimon A, Amartely H, Padan E. The crossing of two unwound transmembrane regions that is the hallmark of the NhaA structural fold is critical for antiporter activity. Sci Rep 2024; 14:5915. [PMID: 38467695 PMCID: PMC10928194 DOI: 10.1038/s41598-024-56425-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 03/06/2024] [Indexed: 03/13/2024] Open
Abstract
Cell pH and Na+ homeostasis requires Na+/H+ antiporters. The crystal structure of NhaA, the main Escherichia coli Na+/H+ antiporter, revealed a unique NhaA structural fold shared by prokaryotic and eukaryotic membrane proteins. Out of the 12 NhaA transmembrane segments (TMs), TMs III-V and X-XII are topologically inverted repeats with unwound TMs IV and XI forming the X shape characterizing the NhaA fold. We show that intramolecular cross-linking under oxidizing conditions of a NhaA mutant with two Cys replacements across the crossing (D133C-T340C) inhibits antiporter activity and impairs NhaA-dependent cell growth in high-salts. The affinity purified D133C-T340C protein binds Li+ (the Na+ surrogate substrate of NhaA) under reducing conditions. The cross-linking traps the antiporter in an outward-facing conformation, blocking the antiport cycle. As many secondary transporters are found to share the NhaA fold, including some involved in human diseases, our data have importance for both basic and clinical research.
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Affiliation(s)
- Abraham Rimon
- Department of Biological Chemistry, Alexander Silberman Institute of Life Sciences, Jerusalem, Israel
- The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, 91904, Jerusalem, Israel
| | - Hadar Amartely
- Wolfson Center for Applied Structural Biology, Jerusalem, Israel
- The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, 91904, Jerusalem, Israel
| | - Etana Padan
- Department of Biological Chemistry, Alexander Silberman Institute of Life Sciences, Jerusalem, Israel.
- The Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, 91904, Jerusalem, Israel.
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11
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Dong Y, Yu Z, Li Y, Huang B, Bai Q, Gao Y, Chen Q, Li N, He L, Zhao Y. Structural insight into the allosteric inhibition of human sodium-calcium exchanger NCX1 by XIP and SEA0400. EMBO J 2024; 43:14-31. [PMID: 38177313 PMCID: PMC10897212 DOI: 10.1038/s44318-023-00013-0] [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: 02/16/2023] [Revised: 11/10/2023] [Accepted: 11/15/2023] [Indexed: 01/06/2024] Open
Abstract
Sodium-calcium exchanger proteins influence calcium homeostasis in many cell types and participate in a wide range of physiological and pathological processes. Here, we elucidate the cryo-EM structure of the human Na+/Ca2+ exchanger NCX1.3 in the presence of a specific inhibitor, SEA0400. Conserved ion-coordinating residues are exposed on the cytoplasmic face of NCX1.3, indicating that the observed structure is stabilized in an inward-facing conformation. We show how regulatory calcium-binding domains (CBDs) assemble with the ion-translocation transmembrane domain (TMD). The exchanger-inhibitory peptide (XIP) is trapped within a groove between the TMD and CBD2 and predicted to clash with gating helices TMs1/6 at the outward-facing state, thus hindering conformational transition and promoting inactivation of the transporter. A bound SEA0400 molecule stiffens helix TM2ab and affects conformational rearrangements of TM2ab that are associated with the ion-exchange reaction, thus allosterically attenuating Ca2+-uptake activity of NCX1.3.
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Affiliation(s)
- Yanli Dong
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Zhuoya Yu
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yue Li
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Bo Huang
- Beijing StoneWise Technology Co Ltd., 15 Haidian street, Haidian district, Beijing, China
| | - Qinru Bai
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yiwei Gao
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qihao Chen
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Na Li
- Heart Center and Beijing Key Laboratory of Hypertension, Beijing Chaoyang Hospital, Capital Medical University, Beijing, 100020, China
| | - Lingli He
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yan Zhao
- Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China.
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
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12
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Ung KL, Schulz L, Kleine-Vehn J, Pedersen BP, Hammes UZ. Auxin transport at the endoplasmic reticulum: roles and structural similarity of PIN-FORMED and PIN-LIKES. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:6893-6903. [PMID: 37279330 DOI: 10.1093/jxb/erad192] [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: 03/02/2023] [Accepted: 06/02/2023] [Indexed: 06/08/2023]
Abstract
Auxin is a crucial plant hormone that controls a multitude of developmental processes. The directional movement of auxin between cells is largely facilitated by canonical PIN-FORMED proteins in the plasma membrane. In contrast, non-canonical PIN-FORMED proteins and PIN-LIKES proteins appear to reside mainly in the endoplasmic reticulum. Despite recent progress in identifying the roles of the endoplasmic reticulum in cellular auxin responses, the transport dynamics of auxin at the endoplasmic reticulum are not well understood. PIN-LIKES are structurally related to PIN-FORMED proteins, and recently published structures of these transporters have provided new insights into PIN-FORMED proteins and PIN-LIKES function. In this review, we summarize current knowledge on PIN-FORMED proteins and PIN-LIKES in intracellular auxin transport. We discuss the physiological properties of the endoplasmic reticulum and the consequences for transport processes across the ER membrane. Finally, we highlight the emerging role of the endoplasmic reticulum in the dynamics of cellular auxin signalling and its impact on plant development.
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Affiliation(s)
- Kien Lam Ung
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Lukas Schulz
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
| | - Jürgen Kleine-Vehn
- Institute of Biology II, Department of Molecular Plant Physiology (MoPP), University of Freiburg, 79104 Freiburg, Germany
- Center for Integrative Biological Signalling Studies (CIBSS), University of Freiburg, 79104 Freiburg, Germany
| | | | - Ulrich Z Hammes
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
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13
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Zhang W, Yao Z, Guo R, Cao J, Li W, Hao C, Zhang X. Identification of novel homozygous nonsense SLC10A7 variant causing short stature, amelogenesis imperfecta, and skeletal dysplasia with scoliosis and surgical management of spine. Orphanet J Rare Dis 2023; 18:371. [PMID: 38037133 PMCID: PMC10691085 DOI: 10.1186/s13023-023-02975-0] [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: 12/13/2022] [Accepted: 11/18/2023] [Indexed: 12/02/2023] Open
Abstract
BACKGROUND Short stature, amelogenesis imperfecta, and skeletal dysplasia with scoliosis is a rare, autosomal recessive, skeletal disorder first described in 2018. This syndrome starts with pre- and postnatal developmental delay, and gradually presents with variable facial dysmorphisms, a short stature, amelogenesis imperfecta, and progressive skeletal dysplasia affecting the limbs, joints, hands, feet, and spine. CASE PRESENTATION We identified a homozygous novel nonsense mutation in exon 1 of SLC10A7 (NM_001300842.2: c.100G > T / p.Gly34*) segregating with the typical disease phenotype in a Han Chinese family. We reviewed the 12-year surgical treatment history with seven interventions on spine. CONCLUSION To date, only 12 cases of the SLC10A7 mutation have been reported, mainly from consanguineous families. Our patient showed a relatively severe and broad clinical phenotype compared with previously reported cases. In this patient, annual check-ups and timely surgeries led to a good outcome.
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Affiliation(s)
- Wenyan Zhang
- Beijing Key Laboratory for Genetics of Birth Defects, MOE Key Laboratory of Major Diseases in Children, Beijing Children's Hospital, Beijing Pediatric Research Institute, Capital Medical University, National Center for Children's Health, Beijing, China
| | - Ziming Yao
- Department of Orthopedics, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China
| | - Ruolan Guo
- Beijing Key Laboratory for Genetics of Birth Defects, MOE Key Laboratory of Major Diseases in Children, Beijing Children's Hospital, Beijing Pediatric Research Institute, Capital Medical University, National Center for Children's Health, Beijing, China
- Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China
| | - Jun Cao
- Department of Orthopedics, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China
| | - Wei Li
- Beijing Key Laboratory for Genetics of Birth Defects, MOE Key Laboratory of Major Diseases in Children, Beijing Children's Hospital, Beijing Pediatric Research Institute, Capital Medical University, National Center for Children's Health, Beijing, China
- Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China
| | - Chanjuan Hao
- Beijing Key Laboratory for Genetics of Birth Defects, MOE Key Laboratory of Major Diseases in Children, Beijing Children's Hospital, Beijing Pediatric Research Institute, Capital Medical University, National Center for Children's Health, Beijing, China.
- Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China.
| | - Xuejun Zhang
- Department of Orthopedics, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.
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14
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Becker P, Naughton F, Brotherton D, Pacheco-Gomez R, Beckstein O, Cameron AD. Mechanism of substrate binding and transport in BASS transporters. eLife 2023; 12:RP89167. [PMID: 37963091 PMCID: PMC10645422 DOI: 10.7554/elife.89167] [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] [Indexed: 11/16/2023] Open
Abstract
The bile acid sodium symporter (BASS) family transports a wide array of molecules across membranes, including bile acids in humans, and small metabolites in plants. These transporters, many of which are sodium-coupled, have been shown to use an elevator mechanism of transport, but exactly how substrate binding is coupled to sodium ion binding and transport is not clear. Here, we solve the crystal structure at 2.3 Å of a transporter from Neisseria meningitidis (ASBTNM) in complex with pantoate, a potential substrate of ASBTNM. The BASS family is characterised by two helices that cross-over in the centre of the protein in an arrangement that is intricately held together by two sodium ions. We observe that the pantoate binds, specifically, between the N-termini of two of the opposing helices in this cross-over region. During molecular dynamics simulations the pantoate remains in this position when sodium ions are present but is more mobile in their absence. Comparison of structures in the presence and absence of pantoate demonstrates that pantoate elicits a conformational change in one of the cross-over helices. This modifies the interface between the two domains that move relative to one another to elicit the elevator mechanism. These results have implications, not only for ASBTNM but for the BASS family as a whole and indeed other transporters that work through the elevator mechanism.
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Affiliation(s)
- Patrick Becker
- School of Life Sciences, University of WarwickCoventryUnited Kingdom
| | - Fiona Naughton
- Department of Physics, Arizona State UniversityTempeUnited States
| | | | | | - Oliver Beckstein
- Department of Physics, Arizona State UniversityTempeUnited States
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15
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Ung KL, Schulz L, Stokes DL, Hammes UZ, Pedersen BP. Substrate recognition and transport mechanism of the PIN-FORMED auxin exporters. Trends Biochem Sci 2023; 48:937-948. [PMID: 37574372 PMCID: PMC10592131 DOI: 10.1016/j.tibs.2023.07.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/30/2023] [Accepted: 07/17/2023] [Indexed: 08/15/2023]
Abstract
Auxins are pivotal plant hormones that regulate plant growth and transmembrane polar auxin transport (PAT) direct patterns of development. The PIN-FORMED (PIN) family of membrane transporters mediate auxin export from the plant cell and play crucial roles in PAT. Here we describe the recently solved structures of PIN transporters, PIN1, PIN3, and PIN8, and also their mechanisms of substrate recognition and transport of auxin. We compare structures of PINs in both inward- and outward-facing conformations, as well as PINs with different binding configurations for auxin. By this comparative analysis, a model emerges for an elevator transport mechanism. Central structural elements necessary for function are identified, and we show that these are shared with other distantly related protein families.
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Affiliation(s)
- Kien Lam Ung
- Department of Molecular Biology and Genetics, Aarhus University, 8000 Aarhus C, Denmark
| | - Lukas Schulz
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
| | - David L Stokes
- Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, NY 10016, USA
| | - Ulrich Z Hammes
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, 85354 Freising, Germany
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16
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Becker P, Naughton FB, Brotherton DH, Pacheco-Gomez R, Beckstein O, Cameron AD. Mechanism of substrate binding and transport in BASS transporters. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.02.543391. [PMID: 37645971 PMCID: PMC10461908 DOI: 10.1101/2023.06.02.543391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
The Bile Acid Sodium Symporter (BASS) family transports a wide array of molecules across membranes, including bile acids in humans, and small metabolites in plants. These transporters, many of which are sodium-coupled, have been shown to use an elevator mechanism of transport, but exactly how substrate binding is coupled to sodium ion binding and transport is not clear. Here we solve the crystal structure at 2.3 Å of a transporter from Neisseria Meningitidis (ASBTNM) in complex with pantoate, a potential substrate of ASBTNM. The BASS family is characterised by two helices that cross-over in the centre of the protein in an arrangement that is intricately held together by two sodium ions. We observe that the pantoate binds, specifically, between the N-termini of two of the opposing helices in this cross-over region. During molecular dynamics simulations the pantoate remains in this position when sodium ions are present but is more mobile in their absence. Comparison of structures in the presence and absence of pantoate demonstrates that pantoate elicits a conformational change in one of the cross-over helices. This modifies the interface between the two domains that move relative to one another to elicit the elevator mechanism. These results have implications, not only for ASBTNM but for the BASS family as a whole and indeed other transporters that work through the elevator mechanism.
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Affiliation(s)
- Patrick Becker
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, U.K
| | | | - Deborah H. Brotherton
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, U.K
| | | | - Oliver Beckstein
- Department of Physics, Arizona State University, Tempe, AZ 85287
| | - Alexander D. Cameron
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, U.K
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17
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Thiyagarajah K, Basic M, Hildt E. Cellular Factors Involved in the Hepatitis D Virus Life Cycle. Viruses 2023; 15:1687. [PMID: 37632029 PMCID: PMC10459925 DOI: 10.3390/v15081687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/30/2023] [Accepted: 08/01/2023] [Indexed: 08/27/2023] Open
Abstract
Hepatitis D virus (HDV) is a defective RNA virus with a negative-strand RNA genome encompassing less than 1700 nucleotides. The HDV genome encodes only for one protein, the hepatitis delta antigen (HDAg), which exists in two forms acting as nucleoproteins. HDV depends on the envelope proteins of the hepatitis B virus as a helper virus for packaging its ribonucleoprotein complex (RNP). HDV is considered the causative agent for the most severe form of viral hepatitis leading to liver fibrosis/cirrhosis and hepatocellular carcinoma. Many steps of the life cycle of HDV are still enigmatic. This review gives an overview of the complete life cycle of HDV and identifies gaps in knowledge. The focus is on the description of cellular factors being involved in the life cycle of HDV and the deregulation of cellular pathways by HDV with respect to their relevance for viral replication, morphogenesis and HDV-associated pathogenesis. Moreover, recent progress in antiviral strategies targeting cellular structures is summarized in this article.
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Affiliation(s)
| | | | - Eberhard Hildt
- Paul-Ehrlich-Institute, Department of Virology, D-63225 Langen, Germany; (K.T.); (M.B.)
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18
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Legrand D, Herbaut M, Durin Z, Brysbaert G, Bardor M, Lensink MF, Foulquier F. New insights into the pathogenicity of TMEM165 variants using structural modeling based on AlphaFold 2 predictions. Comput Struct Biotechnol J 2023; 21:3424-3436. [PMID: 37416081 PMCID: PMC10319644 DOI: 10.1016/j.csbj.2023.06.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/15/2023] [Accepted: 06/15/2023] [Indexed: 07/08/2023] Open
Abstract
TMEM165 is a Golgi protein playing a crucial role in Mn2+ transport, and whose mutations in patients are known to cause Congenital Disorders of Glycosylation. Some of those mutations affect the highly-conserved consensus motifs E-φ-G-D-[KR]-[TS] characterizing the CaCA2/UPF0016 family, presumably important for the transport of Mn2+ which is essential for the function of many Golgi glycosylation enzymes. Others, like the G>R304 mutation, are far away from these motifs in the sequence. Until recently, the classical membrane protein topology prediction methods were unable to provide a clear picture of the organization of TMEM165 inside the cell membrane, or to explain in a convincing manner the impact of patient and experimentally-generated mutations on the transporter function of TMEM165. In this study, AlphaFold 2 was used to build a TMEM165 model that was then refined by molecular dynamics simulation with membrane lipids and water. This model provides a realistic picture of the 3D protein scaffold formed from a two-fold repeat of three transmembrane helices/domains where the consensus motifs face each other to form a putative acidic cation-binding site at the cytosolic side of the protein. It sheds new light on the impact of mutations on the transporter function of TMEM165, found in patients and studied experimentally in vitro, formerly and within this study. More particularly and very interestingly, this model explains the impact of the G>R304 mutation on TMEM165's function. These findings provide great confidence in the predicted TMEM165 model whose structural features are discussed in the study and compared to other structural and functional TMEM165 homologs from the CaCA2/UPF0016 family and the LysE superfamily.
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Affiliation(s)
- Dominique Legrand
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Mélissandre Herbaut
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Zoé Durin
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Guillaume Brysbaert
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Muriel Bardor
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
- Université de Rouen Normandie, Laboratoire GlycoMEV UR 4358, SFR Normandie Végétal FED 4277, Innovation Chimie Carnot, F-76000 Rouen, France
| | - Marc F. Lensink
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - François Foulquier
- Univ. Lille, CNRS, UMR 8576 – UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
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19
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Wannowius M, Karakus E, Aktürk Z, Breuer J, Geyer J. Role of the Sodium-Dependent Organic Anion Transporter (SOAT/SLC10A6) in Physiology and Pathophysiology. Int J Mol Sci 2023; 24:9926. [PMID: 37373074 DOI: 10.3390/ijms24129926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/02/2023] [Accepted: 06/03/2023] [Indexed: 06/29/2023] Open
Abstract
The sodium-dependent organic anion transporter (SOAT, gene symbol SLC10A6) specifically transports 3'- and 17'-monosulfated steroid hormones, such as estrone sulfate and dehydroepiandrosterone sulfate, into specific target cells. These biologically inactive sulfo-conjugated steroids occur in high concentrations in the blood circulation and serve as precursors for the intracrine formation of active estrogens and androgens that contribute to the overall regulation of steroids in many peripheral tissues. Although SOAT expression has been detected in several hormone-responsive peripheral tissues, its quantitative contribution to steroid sulfate uptake in different organs is still not completely clear. Given this fact, the present review provides a comprehensive overview of the current knowledge about the SOAT by summarizing all experimental findings obtained since its first cloning in 2004 and by processing SOAT/SLC10A6-related data from genome-wide protein and mRNA expression databases. In conclusion, despite a significantly increased understanding of the function and physiological significance of the SOAT over the past 20 years, further studies are needed to finally establish it as a potential drug target for endocrine-based therapy of steroid-responsive diseases such as hormone-dependent breast cancer.
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Affiliation(s)
- Marie Wannowius
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Biomedical Research Center Seltersberg (BFS), Justus Liebig University of Giessen, Schubertstr. 81, 35392 Giessen, Germany
| | - Emre Karakus
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Biomedical Research Center Seltersberg (BFS), Justus Liebig University of Giessen, Schubertstr. 81, 35392 Giessen, Germany
| | - Zekeriya Aktürk
- General Practice, Faculty of Medicine, University of Augsburg, 86159 Augsburg, Germany
| | - Janina Breuer
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Biomedical Research Center Seltersberg (BFS), Justus Liebig University of Giessen, Schubertstr. 81, 35392 Giessen, Germany
| | - Joachim Geyer
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Biomedical Research Center Seltersberg (BFS), Justus Liebig University of Giessen, Schubertstr. 81, 35392 Giessen, Germany
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20
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Mizio K, Wawrzycka D, Staszewski J, Wysocki R, Maciaszczyk-Dziubinska E. Identification of amino acid substitutions that toggle substrate selectivity of the yeast arsenite transporter Acr3. JOURNAL OF HAZARDOUS MATERIALS 2023; 456:131653. [PMID: 37224717 DOI: 10.1016/j.jhazmat.2023.131653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/03/2023] [Accepted: 05/15/2023] [Indexed: 05/26/2023]
Abstract
The Acr3 protein family plays a crucial role in metalloid detoxification and includes members from bacteria to higher plants. Most of the Acr3 transporters studied so far are specific for arsenite, whereas Acr3 from budding yeast also shows some capacity to transport antimonite. However, the molecular basis of Acr3 substrate specificity remains poorly understood. By analyzing randomly generated and rationally designed yeast Acr3 variants, critical residues determining substrate specificity were identified for the first time. Replacement of Val173 with Ala abolished antimonite transport without affecting arsenite extrusion. In contrast, substitution of Glu353 with Asp resulted in a loss of arsenite transport activity and a concomitant increase in antimonite translocation capacity. Importantly, Val173 is located close to the hypothetical substrate binding site, whereas Glu353 has been proposed to participate in substrate binding. Identification of key residues conferring substrate selectivity provides a valuable starting point for further studies of the Acr3 family and may have implications for the development of biotechnological applications in metalloid remediation. Moreover, our data contribute to understanding why members of the Acr3 family evolved as arsenite-specific transporters in an environment of ubiquitously present arsenic and trace amounts of antimony.
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Affiliation(s)
- Katarzyna Mizio
- Department of Genetics and Cell Physiology, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland
| | - Donata Wawrzycka
- Department of Genetics and Cell Physiology, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland
| | - Jacek Staszewski
- Department of Genetics and Cell Physiology, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland
| | - Robert Wysocki
- Department of Genetics and Cell Physiology, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland
| | - Ewa Maciaszczyk-Dziubinska
- Department of Genetics and Cell Physiology, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland.
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21
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Kaipa JM, Krasnoselska G, Owens RJ, van den Heuvel J. Screening of Membrane Protein Production by Comparison of Transient Expression in Insect and Mammalian Cells. Biomolecules 2023; 13:biom13050817. [PMID: 37238687 DOI: 10.3390/biom13050817] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 05/04/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023] Open
Abstract
Membrane proteins are difficult biomolecules to express and purify. In this paper, we compare the small-scale production of six selected eukaryotic integral membrane proteins in insect and mammalian cell expression systems using different techniques for gene delivery. The target proteins were C terminally fused to the green fluorescent marker protein GFP to enable sensitive monitoring. We show that the choice of expression systems makes a considerable difference to the yield and quality of the six selected membrane proteins. Virus-free transient gene expression (TGE) in insect High Five cells combined with solubilization in dodecylmaltoside plus cholesteryl hemisuccinate generated the most homogeneous samples for all six targets. Further, the affinity purification of the solubilized proteins using the Twin-Strep® tag improved protein quality in terms of yield and homogeneity compared to His-tag purification. TGE in High Five insect cells offers a fast and economically attractive alternative to the established methods that require either baculovirus construction and the infection of the insect cells or relatively expensive transient gene expression in mammalian cells for the production of integral membrane proteins.
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Affiliation(s)
| | - Ganna Krasnoselska
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, 18.5, 42, 2200 Copenhagen, Denmark
| | - Raymond J Owens
- Structural Biology Division, Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK
- Rosalind Franklin Institute, Harwell Campus, Didcot OX11 0QX, UK
| | - Joop van den Heuvel
- Helmholtz Center for Infection Research, Department of Structure and Function of Proteins, Inhoffenstrasse 7, 38124 Braunschweig, Germany
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22
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Sharma S, Rawal P, Kaur S, Puria R. Liver organoids as a primary human model to study HBV-mediated Hepatocellular carcinoma. A review. Exp Cell Res 2023; 428:113618. [PMID: 37142202 DOI: 10.1016/j.yexcr.2023.113618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 04/21/2023] [Accepted: 04/26/2023] [Indexed: 05/06/2023]
Abstract
Hepatitis B Virus (HBV) is the prevailing cause of chronic liver disease, which progresses to Hepatocellular carcinoma (HCC) in 75% of cases. It represents a serious health concern being the fourth leading cause of cancer-related mortality worldwide. Treatments available to date fail to provide a complete cure with high chances of recurrence and related side effects. The lack of reliable, reproducible, and scalable in vitro modeling systems that could recapitulate the viral life cycle and represent virus-host interactions has hindered the development of effective treatments so far. The present review provides insights into the current in-vivo and in-vitro models used for studying HBV and their major limitations. We highlight the use of three-dimensional liver organoids as a novel and suitable platform for modeling HBV infection and HBV-mediated HCC. HBV organoids can be expanded, genetically altered, patient-derived, tested for drug discovery, and biobanked. This review also provides the general guidelines for culturing HBV organoids and highlights their several prospects for HBV drug discovery and screening.
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Affiliation(s)
- Simran Sharma
- School of Biotechnology, Gautam Buddha University, Greater Noida, India
| | - Preety Rawal
- School of Biotechnology, Gautam Buddha University, Greater Noida, India
| | - Savneet Kaur
- Institute of Liver and Biliary Sciences, Delhi, India.
| | - Rekha Puria
- School of Biotechnology, Gautam Buddha University, Greater Noida, India.
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23
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Zakrzewicz D, Geyer J. Interactions of Na +/taurocholate cotransporting polypeptide with host cellular proteins upon hepatitis B and D virus infection: novel potential targets for antiviral therapy. Biol Chem 2023:hsz-2022-0345. [PMID: 37103224 DOI: 10.1515/hsz-2022-0345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Accepted: 04/13/2023] [Indexed: 04/28/2023]
Abstract
Na+/taurocholate cotransporting polypeptide (NTCP) is a member of the solute carrier (SLC) family 10 transporters (gene symbol SLC10A1) and is responsible for the sodium-dependent uptake of bile salts across the basolateral membrane of hepatocytes. In addition to its primary transporter function, NTCP is the high-affinity hepatic receptor for hepatitis B (HBV) and hepatitis D (HDV) viruses and, therefore, is a prerequisite for HBV/HDV virus entry into hepatocytes. The inhibition of HBV/HDV binding to NTCP and internalization of the virus/NTCP receptor complex has become a major concept in the development of new antiviral drugs called HBV/HDV entry inhibitors. Hence, NTCP has emerged as a promising target for therapeutic interventions against HBV/HDV infections in the last decade. In this review, recent findings on protein-protein interactions (PPIs) between NTCP and cofactors relevant for entry of the virus/NTCP receptor complex are summarized. In addition, strategies aiming to block PPIs with NTCP to dampen virus tropism and HBV/HDV infection rates are discussed. Finally, this article suggests novel directions for future investigations evaluating the functional contribution of NTCP-mediated PPIs in the development and progression of HBV/HDV infection and subsequent chronic liver disorders.
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Affiliation(s)
- Dariusz Zakrzewicz
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus-Liebig-University Giessen, Schubertstr. 81, D-35392 Giessen, Germany
| | - Joachim Geyer
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus-Liebig-University Giessen, Schubertstr. 81, D-35392 Giessen, Germany
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24
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Andersen CG, Bavnhøj L, Pedersen BP. May the proton motive force be with you: A plant transporter review. Curr Opin Struct Biol 2023; 79:102535. [PMID: 36796226 DOI: 10.1016/j.sbi.2023.102535] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/28/2022] [Accepted: 01/03/2023] [Indexed: 02/16/2023]
Abstract
As our ecosystems experience challenges associated with climate change, an improved understanding of the fundamental biochemical processes governing plant physiology is needed. Strikingly, current structural information on plant membrane transporters is severely limited compared to other kingdoms of life, with only 18 unique structures in total. To advance future breakthroughs and insight in plant cell molecular biology, structural knowledge of membrane transporters is indispensable. This review summarizes the current status of structural knowledge in the plant membrane transporter field. Plants utilize the proton motive force (PMF) to drive secondary active transport. We discuss the PMF, how it relates to secondary active transport and provide a classification of PMF driven secondary active transport, discussing recently published structures of symporters, antiporters, and uniporters from plants.
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Affiliation(s)
| | - Laust Bavnhøj
- Department of Molecular Biology and Genetics, Aarhus University, 8000, Aarhus C, Denmark. https://twitter.com/laustbavnhoej
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25
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Deng F, Bae YH. Effect of modification of polystyrene nanoparticles with different bile acids on their oral transport. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2023; 48:102629. [PMID: 36410698 PMCID: PMC9918699 DOI: 10.1016/j.nano.2022.102629] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/25/2022] [Accepted: 11/11/2022] [Indexed: 11/23/2022]
Abstract
Bile acid-modified nanomedicine is a promising strategy to improve oral bioavailability. However, the efficiencies of different bile acids have not been clarified. To clarify this issue, deoxycholic acid (DCA) and cholic acid (CA) and glycocholic acid (GCA) were conjugated to carboxylated polystyrene nanoparticle (CPN). The endocytosis, intracellular and transcellular transport among the NPs were compared in Caco-2 cells, and their oral pharmacokinetics profiles were studied in C57BL/6 J mice. It was found that DCPN demonstrated higher uptake and transcytosis rate. With modification by different bile acids, the transport pathways of the NPs were altered. In mice, GCPN showed the highest absorption speed and oral bioavailability. It was found that the synergic effect of hydrophobicity and ASBT affinity might lead to the difference between in vitro and in vivo transport. This study will build a basis for the rational design of bile acid-modified nanomedicines.
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Affiliation(s)
- Feiyang Deng
- Department of Pharmaceutics and Pharmaceutical Chemistry, College of Pharmacy, University of Utah, 30 S 2000 E, Salt Lake City, UT 84112, USA
| | - You Han Bae
- Department of Pharmaceutics and Pharmaceutical Chemistry, College of Pharmacy, University of Utah, 30 S 2000 E, Salt Lake City, UT 84112, USA.
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26
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Zhang Y, Jiang Y, Gao K, Sui D, Yu P, Su M, Wei GW, Hu J. Structural insights into the elevator-type transport mechanism of a bacterial ZIP metal transporter. Nat Commun 2023; 14:385. [PMID: 36693843 PMCID: PMC9873690 DOI: 10.1038/s41467-023-36048-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 01/13/2023] [Indexed: 01/26/2023] Open
Abstract
The Zrt-/Irt-like protein (ZIP) family consists of ubiquitously expressed divalent metal transporters critically involved in maintaining systemic and cellular homeostasis of zinc, iron, and manganese. Here, we present a study on a prokaryotic ZIP from Bordetella bronchiseptica (BbZIP) by combining structural biology, evolutionary covariance, computational modeling, and a variety of biochemical assays to tackle the issue of the transport mechanism which has not been established for the ZIP family. The apo state structure in an inward-facing conformation revealed a disassembled transport site, altered inter-helical interactions, and importantly, a rigid body movement of a 4-transmembrane helix (TM) bundle relative to the other TMs. The computationally generated and biochemically validated outward-facing conformation model revealed a slide of the 4-TM bundle, which carries the transport site(s), by approximately 8 Å toward the extracellular side against the static TMs which mediate dimerization. These findings allow us to conclude that BbZIP is an elevator-type transporter.
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Affiliation(s)
- Yao Zhang
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | - Yuhan Jiang
- Department of Chemistry, Michigan State University, East Lansing, MI, USA
| | - Kaifu Gao
- Department of Mathematics, Michigan State University, East Lansing, MI, USA
| | - Dexin Sui
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | - Peixuan Yu
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
| | - Min Su
- Life Sciences Institute, University of Michigan, Ann Arbor, MI, USA
| | - Guo-Wei Wei
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA
- Department of Mathematics, Michigan State University, East Lansing, MI, USA
| | - Jian Hu
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, USA.
- Department of Chemistry, Michigan State University, East Lansing, MI, USA.
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27
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Gyimesi G, Hediger MA. Transporter-Mediated Drug Delivery. Molecules 2023; 28:molecules28031151. [PMID: 36770817 PMCID: PMC9919865 DOI: 10.3390/molecules28031151] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/12/2023] [Accepted: 01/18/2023] [Indexed: 01/27/2023] Open
Abstract
Transmembrane transport of small organic and inorganic molecules is one of the cornerstones of cellular metabolism. Among transmembrane transporters, solute carrier (SLC) proteins form the largest, albeit very diverse, superfamily with over 400 members. It was recognized early on that xenobiotics can directly interact with SLCs and that this interaction can fundamentally determine their efficacy, including bioavailability and intertissue distribution. Apart from the well-established prodrug strategy, the chemical ligation of transporter substrates to nanoparticles of various chemical compositions has recently been used as a means to enhance their targeting and absorption. In this review, we summarize efforts in drug design exploiting interactions with specific SLC transporters to optimize their therapeutic effects. Furthermore, we describe current and future challenges as well as new directions for the advanced development of therapeutics that target SLC transporters.
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28
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Terakado Kimura K, Watashi K. [Structural insights into Hepatitis B and D virus entry receptors]. Uirusu 2023; 73:89-94. [PMID: 39343532 DOI: 10.2222/jsv.73.89] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2024]
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29
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Choi E, Huh A, Hwang J. Novel rRNA transcriptional activity of NhaR revealed by its growth recovery for the bipA-deleted Escherichia coli at low temperature. Front Mol Biosci 2023; 10:1175889. [PMID: 37152896 PMCID: PMC10157491 DOI: 10.3389/fmolb.2023.1175889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/12/2023] [Indexed: 05/09/2023] Open
Abstract
The BipA protein is a universally conserved GTPase in bacterial species and is structurally similar to translational GTPases. Despite its wide distribution, BipA is dispensable for growth under optimal growth conditions but is required under stress conditions. In particular, bipA-deleted cells (ESC19) have been shown to display a variety of phenotypic changes in ribosome assembly, capsule production, lipopolysaccharide (LPS) synthesis, biofilm formation, and motility at low temperature, suggesting its global regulatory roles in cold adaptation. Here, through genomic library screening, we found a suppressor clone containing nhaR, which encodes a Na+-responsive LysR-type transcriptional regulator and whose gene product partially restored the growth of strain ESC19 at 20°C. The suppressed cells showed slightly reduced capsule production and improved biofilm-forming ability at 20°C, whereas the defects in the LPS core and swimming motility were not restored but aggravated by overexpression of nhaR. Notably, the overexpression partially alleviated the defects in 50S ribosomal subunit assembly and rRNA processing of ESC19 cells by enhancing the overall transcription of rRNA. Electrophoretic mobility shift assay revealed the association of NhaR with the promoter of seven rrn operons, suggesting that NhaR directly regulates rRNA transcription in ESC19 at 20°C. The suppressive effects of NhaR on ribosomes, capsules, and LPS were dependent on its DNA-binding activity, implying that NhaR might be a transcriptional factor involved in regulating these genes at 20°C. Furthermore, we found that BipA may be involved in adaptation to salt stress, designating BipA as a global stress-responsive regulator, as the deletion of bipA led to growth defects at 37°C and high Na+ concentrations without ribosomal defects.
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Affiliation(s)
- Eunsil Choi
- Department of Microbiology, Pusan National University, Busan, Republic of Korea
- Microbiological Resource Research Institute, Pusan National University, Busan, Republic of Korea
| | - Ahhyun Huh
- Department of Microbiology, Pusan National University, Busan, Republic of Korea
| | - Jihwan Hwang
- Department of Microbiology, Pusan National University, Busan, Republic of Korea
- Microbiological Resource Research Institute, Pusan National University, Busan, Republic of Korea
- *Correspondence: Jihwan Hwang,
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30
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Metry M, Dirda ND, Raufman JP, Polli JE, Kao JPY. Novel nitroxide-bile acid conjugates inform substrate requirements for human bile acid transporters. Eur J Pharm Sci 2023; 180:106335. [PMID: 36402308 PMCID: PMC9908032 DOI: 10.1016/j.ejps.2022.106335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 11/10/2022] [Accepted: 11/15/2022] [Indexed: 11/18/2022]
Abstract
Transport of bile acids within the enterohepatic circulation from the liver to the intestines via the gallbladder and back to the liver via the portal vein plays a critical role in bile acid regulation and homeostasis. Deficiency of fibroblast growth factor 19 (FGF19), a hormone whose role is to suppress de novo hepatic bile acid synthesis to maintain homeostatic levels, results in bile acid diarrhea (BAD). FGF19 also modulates gallbladder motility so that bile acids are concentrated in the gallbladder until postprandial contraction. To assess bile acid transport and diagnose ailments like BAD that are associated with altered bile acid synthesis and transport, we created bile acid conjugates with nitroxide radicals. Because nitroxides are paramagnetic and can promote proton relaxation, we reasoned that these paramagnetic conjugates should act as contrast agents in in vivo magnetic resonance imaging (MRI). We tested substrate capability by assessing the inhibitory potential of these novel agents against taurocholate uptake by the apical sodium dependent bile acid transporter (ASBT) and the Na+/taurocholate cotransporting polypeptide (NTCP). Surprisingly, neither the paramagnetic compounds CA-Px-1 and CA-Px-2, nor their reduced forms, CA-Px-1H and CA-Px-2H, inhibited hASBT- or hNTCP-mediated taurocholate uptake. Therefore, the new conjugates cannot serve as contrast agents for MRI in vivo. However, our findings identify important structural constraints of transportable bile acid conjugates and suggest potential modifications to overcome these limitations.
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Affiliation(s)
- Melissa Metry
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 Penn Street, N623, Baltimore, MD 21201, United States
| | - Nathaniel D.A. Dirda
- Center for Biomedical Engineering and Technology, and Department of Physiology, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Jean-Pierre Raufman
- VA Maryland Healthcare System, Department of Medicine, Division of Gastroenterology & Hepatology, Department of Biochemistry and Molecular Biology, and the Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - James E. Polli
- Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, 20 Penn Street, N623, Baltimore, MD 21201, United States,Corresponding author: (J.E. Polli)
| | - Joseph P. Y. Kao
- Center for Biomedical Engineering and Technology, and Department of Physiology, University of Maryland School of Medicine, Baltimore, MD 21201, United States
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31
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Lv P, Shang Y, Zhang Y, Wang W, Liu Y, Su D, Wang W, Li C, Ma C, Yang C. Structural basis for the arsenite binding and translocation of Acr3 antiporter with NhaA folding pattern. FASEB J 2022; 36:e22659. [PMID: 36394534 DOI: 10.1096/fj.202201280r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 10/05/2022] [Accepted: 11/07/2022] [Indexed: 11/18/2022]
Abstract
The arsenical resistance-3 (ACR3) family constitutes the most common pathway that confers high-level resistance to toxic metalloids in various microorganisms and lower plants. Based on the structural model constructed by AlphaFold2, the Acr3 antiporter from Bacillus subtilis (Acr3Bs ) exhibits a typical NhaA structure fold, with two discontinuous helices of transmembrane (TM) segments, TM4 and TM9, interacting with each other and forming an X-shaped structure. As the structural information available for these important arsenite-efflux pumps is limited, we investigated the evolutionary conservation among 300 homolog sequences and identified three conserved motifs in both the discontinuous helices and TM5. Through site-directed mutagenesis, microscale thermophoresis (MST), and fluorescence resonance energy transfer (FRET) analyses, the identified Motif C in TM9 was found to be a critical element for substrate binding, in which N292 and E295 are involved in substrate coordination, while R118 in TM4 and E322 in TM10 is responsible for structural stabilization. In addition, the highly conserved residues on Motif B of TM5 are potentially key factors in the protonation/deprotonation process. These consensus motifs and residues are essential for metalloid compound translocation of Acr3 antiporters, by framing the core domain and the typical X-shaped of NhaA fold.
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Affiliation(s)
- Peiwen Lv
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Yan Shang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Ye Zhang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Wenkai Wang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Yuanxiang Liu
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Dandan Su
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Wei Wang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Chunfang Li
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Cuiqing Ma
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
| | - Chunyu Yang
- State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, P.R. China
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32
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Forster ER, Yang X, Tai AK, Hang HC, Shen A. Identification of a Bile Acid-Binding Transcription Factor in Clostridioides difficile Using Chemical Proteomics. ACS Chem Biol 2022; 17:3086-3099. [PMID: 36279369 PMCID: PMC10518218 DOI: 10.1021/acschembio.2c00463] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Clostridioides difficile is a Gram-positive anaerobic bacterium that is the leading cause of hospital-acquired gastroenteritis in the US. In the gut milieu, C. difficile encounters microbiota-derived, growth-inhibiting bile acids that are thought to be a significant mechanism of colonization resistance. While the levels of certain bile acids in the gut correlate with susceptibility to C. difficile infection, their molecular targets in C. difficile remain unknown. In this study, we sought to use chemical proteomics to identify bile acid-interacting proteins in C. difficile. Using photoaffinity bile acid probes and chemical proteomics, we identified a previously uncharacterized MerR family protein, CD3583 (now BapR), as a putative bile acid-sensing transcription regulator. Our data indicate that BapR specifically binds to and is stabilized by lithocholic acid (LCA) in C. difficile. Although loss of BapR did not affect C. difficile's sensitivity to LCA, ΔbapR cells elongated more in the presence of LCA compared to wild-type cells. Transcriptomics revealed that BapR regulates several gene clusters, with the expression of the mdeA-cd3573 locus being specifically de-repressed in the presence of LCA in a BapR-dependent manner. Electrophoretic mobility shift assays revealed that BapR directly binds to the mdeA promoter region. Because mdeA is involved in amino acid-related sulfur metabolism and the mdeA-cd3573 locus encodes putative transporters, we propose that BapR senses a gastrointestinal tract-specific small molecule, LCA, as an environmental cue for metabolic adaptation.
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Affiliation(s)
- Emily R Forster
- Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts 02111, United States
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111, United States
| | - Xinglin Yang
- Department of Immunology and Microbiology, Scripps Research, La Jolla, California 92037, United States
| | - Albert K Tai
- Department of Immunology, Tufts University School of Medicine, Boston, Massachusetts 02111, United States
- Data Intensive Studies Center, Tufts University, Medford, Massachusetts 02155, United States
| | - Howard C Hang
- Department of Immunology and Microbiology, Scripps Research, La Jolla, California 92037, United States
- Department of Chemistry, Scripps Research, La Jolla, California 92037, United States
| | - Aimee Shen
- Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111, United States
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33
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Structure-based virtual screening and molecular dynamics of potential inhibitors targeting sodium-bile acid co-transporter of carcinogenic liver fluke Clonorchis sinensis. PLoS Negl Trop Dis 2022; 16:e0010909. [DOI: 10.1371/journal.pntd.0010909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 10/25/2022] [Indexed: 11/11/2022] Open
Abstract
Background
Clonorchis sinensis requires bile acid transporters as this fluke inhabits bile juice-filled biliary ducts, which provide an extreme environment. Clonorchis sinensis sodium-bile acid co-transporter (CsSBAT) is indispensable for the fluke’s survival in the final host, as it circulates taurocholate and prevents bile toxicity in the fluke; hence, it is recognized as a useful drug target.
Methodology and principal findings
In the present study, using structure-based virtual screening approach, we presented inhibitor candidates targeting a bile acid-binding pocket of CsSBAT. CsSBAT models were built using tertiary structure modeling based on a bile acid transporter template (PDB ID: 3zuy and 4n7x) and were applied into AutoDock Vina for competitive docking simulation. First, potential compounds were identified from PubChem (holding more than 100,000 compounds) by applying three criteria: i) interacting more favorably with CsSBAT than with a human homolog, ii) intimate interaction to the inward- and outward-facing conformational states, iii) binding with CsSBAT preferably to natural bile acids. Second, two compounds were identified following the Lipinski’s rule of five. Third, other two compounds of molecular weight higher than 500 Da (Mr > 500 Da) were presumed to efficiently block the transporter via a feasible rational screening strategy. Of these candidates, compound 9806452 exhibited the least hepatotoxicity that may enhance drug-likeness properties.
Conclusions
It is proposed that compound 9806452 act as a potential inhibitor toward CsSBAT and further studies are warranted for drug development process against clonorchiasis.
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34
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Verrier ÉR. [Hepatitis B virus receptor: Structure and clinical implications]. Med Sci (Paris) 2022; 38:867-869. [PMID: 36448889 DOI: 10.1051/medsci/2022136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Affiliation(s)
- Éloi R Verrier
- Université de Strasbourg, Inserm, Institut de recherche sur les maladies virales et hépatiques, UMRS 1110, Strasbourg, France
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35
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A structure and evolutionary-based classification of solute carriers. iScience 2022; 25:105096. [PMID: 36164651 PMCID: PMC9508557 DOI: 10.1016/j.isci.2022.105096] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 07/22/2022] [Accepted: 09/04/2022] [Indexed: 11/22/2022] Open
Abstract
Solute carriers are an operationally defined diverse family of membrane proteins involved in the transport of nutrients, metabolites, xenobiotics, and drugs. Here, we provide an integrative classification of solute carriers by combining evolutionary information with proteome-wide structure models recently made available through the AlphaFold resource. Analyses of orthologous relations among 455 protein-coding genes currently classified as human solute carriers, over the fully sequenced genomes of 2,100 species, suggest no more than approximately 180 independent evolutionary origins. Structural comparative analyses provided further insight revealing a total of 24 structurally distinct transmembrane folds, increasing by approximately 40% the number of previously described SLC structural folds. In addition, a structural comparative analysis identified a new human solute carrier member and revealed details of noncanonical ones. Our analyses uncover new ancestral relations between solute carrier genes, provide insights into the evolution of remote homologs and a platform to test hypotheses of functional deorphanization.
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36
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Chen S, Zhang L, Chen Y, Fu L. Inhibiting Sodium Taurocholate Cotransporting Polypeptide in HBV-Related Diseases: From Biological Function to Therapeutic Potential. J Med Chem 2022; 65:12546-12561. [DOI: 10.1021/acs.jmedchem.2c01097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Siwei Chen
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Lan Zhang
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Yi Chen
- Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Leilei Fu
- Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
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37
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Prokaryotic Na+/H+ Exchangers—Transport Mechanism and Essential Residues. Int J Mol Sci 2022; 23:ijms23169156. [PMID: 36012428 PMCID: PMC9408914 DOI: 10.3390/ijms23169156] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/09/2022] [Accepted: 08/13/2022] [Indexed: 11/16/2022] Open
Abstract
Na+/H+ exchangers are essential for Na+ and pH homeostasis in all organisms. Human Na+/H+ exchangers are of high medical interest, and insights into their structure and function are aided by the investigation of prokaryotic homologues. Most prokaryotic Na+/H+ exchangers belong to either the Cation/Proton Antiporter (CPA) superfamily, the Ion Transport (IT) superfamily, or the Na+-translocating Mrp transporter superfamily. Several structures have been solved so far for CPA and Mrp members, but none for the IT members. NhaA from E. coli has served as the prototype of Na+/H+ exchangers due to the high amount of structural and functional data available. Recent structures from other CPA exchangers, together with diverse functional information, have allowed elucidation of some common working principles shared by Na+/H+ exchangers from different families, such as the type of residues involved in the substrate binding and even a simple mechanism sufficient to explain the pH regulation in the CPA and IT superfamilies. Here, we review several aspects of prokaryotic Na+/H+ exchanger structure and function, discussing the similarities and differences between different transporters, with a focus on the CPA and IT exchangers. We also discuss the proposed transport mechanisms for Na+/H+ exchangers that explain their highly pH-regulated activity profile.
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38
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Yang Z, Xia J, Hong J, Zhang C, Wei H, Ying W, Sun C, Sun L, Mao Y, Gao Y, Tan S, Friml J, Li D, Liu X, Sun L. Structural insights into auxin recognition and efflux by Arabidopsis PIN1. Nature 2022; 609:611-615. [PMID: 35917925 PMCID: PMC9477737 DOI: 10.1038/s41586-022-05143-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 07/25/2022] [Indexed: 11/09/2022]
Abstract
Polar auxin transport is unique to plants and coordinates their growth and development1,2. The PIN-FORMED (PIN) auxin transporters exhibit highly asymmetrical localizations at the plasma membrane and drive polar auxin transport3,4; however, their structures and transport mechanisms remain largely unknown. Here, we report three inward-facing conformation structures of Arabidopsis thaliana PIN1: the apo state, bound to the natural auxin indole-3-acetic acid (IAA), and in complex with the polar auxin transport inhibitor N-1-naphthylphthalamic acid (NPA). The transmembrane domain of PIN1 shares a conserved NhaA fold5. In the substrate-bound structure, IAA is coordinated by both hydrophobic stacking and hydrogen bonding. NPA competes with IAA for the same site at the intracellular pocket, but with a much higher affinity. These findings inform our understanding of the substrate recognition and transport mechanisms of PINs and set up a framework for future research on directional auxin transport, one of the most crucial processes underlying plant development. Structures of the Arabidopsis thaliana auxin exporter PIN1 in the apo state, bound to the natural auxin or bound to an inhibitor provide insights into the polar auxin transport mechanisms mediated by PIN family transporters.
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Affiliation(s)
- Zhisen Yang
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Jing Xia
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Jingjing Hong
- CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, University of CAS, Chinese Academy of Sciences (CAS), Shanghai, China
| | - Chenxi Zhang
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Hong Wei
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Wei Ying
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Chunqiao Sun
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Lianghanxiao Sun
- MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Yanbo Mao
- MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Yongxiang Gao
- Cryo-EM Center, Core Facility Center for Life Sciences, University of Science and Technology of China, Hefei, China
| | - Shutang Tan
- MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China
| | - Jiří Friml
- Institute of Science and Technology Austria (IST Austria), Am Campus 1, Klosterneuburg, Austria
| | - Dianfan Li
- CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, University of CAS, Chinese Academy of Sciences (CAS), Shanghai, China
| | - Xin Liu
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China. .,Biomedical Sciences and Health Laboratory of Anhui Province, University of Science and Technology of China, Hefei, China.
| | - Linfeng Sun
- The First Affiliated Hospital of USTC, MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, China. .,Biomedical Sciences and Health Laboratory of Anhui Province, University of Science and Technology of China, Hefei, China.
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Su N, Zhu A, Tao X, Ding ZJ, Chang S, Ye F, Zhang Y, Zhao C, Chen Q, Wang J, Zhou CY, Guo Y, Jiao S, Zhang S, Wen H, Ma L, Ye S, Zheng SJ, Yang F, Wu S, Guo J. Structures and mechanisms of the Arabidopsis auxin transporter PIN3. Nature 2022; 609:616-621. [PMID: 35917926 DOI: 10.1038/s41586-022-05142-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 07/25/2022] [Indexed: 11/09/2022]
Abstract
The PIN-FORMED (PIN) protein family of auxin transporters mediates the polar auxin transport and plays crucial roles in plant growth and development1,2. Here we present cryo-EM structures of PIN3 from Arabidopsis thaliana (AtPIN3) in the apo state and in complex with its substrate indole-3-acetic acid (IAA) and the inhibitor N-1-naphthylphthalamic acid (NPA) at 2.6-3.0 Å resolution. AtPIN3 exists as a homodimer, with the transmembrane helices (TMs) 1, 2, and 7 in the scaffold domain involved in dimerization. The dimeric AtPIN3 forms a large, joint extracellular-facing cavity at the dimer interface while each subunit adopts an inward-facing conformation. The structural and functional analyses, along with computational studies, reveal the structural basis for the recognition of IAA and NPA and elucidate the molecular mechanism of NPA inhibition on the PIN-mediated auxin transport. The AtPIN3 structures support an elevator-like model for the transport of auxin, whereby the transport domains undergo up-down rigid-body motions and the dimerized scaffold domains remain static.
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Affiliation(s)
- Nannan Su
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Aiqin Zhu
- Department of Biophysics and Kidney Disease Center, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Xin Tao
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei, China
| | - Zhong Jie Ding
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Shenghai Chang
- Center of Cryo-Electron Microscopy, Zhejiang University School of Medicine, Hangzhou, China
| | - Fan Ye
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Yan Zhang
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Cheng Zhao
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Qian Chen
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Jiangqin Wang
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Chen Yu Zhou
- Center of Cryo-Electron Microscopy, Zhejiang University School of Medicine, Hangzhou, China
| | - Yirong Guo
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, China
| | - Shasha Jiao
- Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou, China
| | - Sufen Zhang
- College of agriculture and biotechnology, Zhejiang University, Hangzhou, China
| | - Han Wen
- DP Technology, Beijing, China
| | - Lixin Ma
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei, China
| | - Sheng Ye
- Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures, School of Life Sciences, Tianjin University, Tianjin, China
| | - Shao Jian Zheng
- Center of Cryo-Electron Microscopy, Zhejiang University School of Medicine, Hangzhou, China
| | - Fan Yang
- Department of Biophysics and Kidney Disease Center, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China. .,Alibaba-Zhejiang University Joint Research Center of Future Digital Healthcare, Hangzhou, Zhejiang, China. .,NHC and CAMS Key Laboratory of Medical Neurobiology, MOE Frontier Science Center for Brain Science and Brain-machine Integration, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang, China.
| | - Shan Wu
- State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan, Hubei, China.
| | - Jiangtao Guo
- Department of Biophysics, and Department of Neurology of the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China. .,Center of Cryo-Electron Microscopy, Zhejiang University School of Medicine, Hangzhou, China. .,NHC and CAMS Key Laboratory of Medical Neurobiology, MOE Frontier Science Center for Brain Science and Brain-machine Integration, School of Brain Science and Brain Medicine, Zhejiang University, Hangzhou, Zhejiang, China. .,Department of Cardiology, Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China. .,Cancer Center, Zhejiang University, Hangzhou, Zhejiang, China. .,Liangzhu Laboratory, Zhejiang University Medical Center, Hangzhou, Zhejiang, China.
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40
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Liu H, Irobalieva RN, Bang-Sørensen R, Nosol K, Mukherjee S, Agrawal P, Stieger B, Kossiakoff AA, Locher KP. Structure of human NTCP reveals the basis of recognition and sodium-driven transport of bile salts into the liver. Cell Res 2022; 32:773-776. [PMID: 35726088 PMCID: PMC9343345 DOI: 10.1038/s41422-022-00680-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 05/30/2022] [Indexed: 12/16/2022] Open
Affiliation(s)
- Hongtao Liu
- Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland
| | | | - Rose Bang-Sørensen
- Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland
| | - Kamil Nosol
- Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland
| | - Somnath Mukherjee
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA
| | - Parth Agrawal
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA
| | - Bruno Stieger
- Department of Clinical Pharmacology and Toxicology, University Hospital Zürich, University of Zürich, Zürich, Switzerland
| | - Anthony A Kossiakoff
- Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA
| | - Kaspar P Locher
- Institute of Molecular Biology and Biophysics, ETH Zürich, Zürich, Switzerland.
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41
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Tremmel R, Nies AT, van Eijck BAC, Handin N, Haag M, Winter S, Büttner FA, Kölz C, Klein F, Mazzola P, Hofmann U, Klein K, Hoffmann P, Nöthen MM, Gaugaz FZ, Artursson P, Schwab M, Schaeffeler E. Hepatic Expression of the Na+-Taurocholate Cotransporting Polypeptide Is Independent from Genetic Variation. Int J Mol Sci 2022; 23:ijms23137468. [PMID: 35806468 PMCID: PMC9267852 DOI: 10.3390/ijms23137468] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 06/29/2022] [Accepted: 06/29/2022] [Indexed: 11/16/2022] Open
Abstract
The hepatic Na+-taurocholate cotransporting polypeptide NTCP/SLC10A1 is important for the uptake of bile salts and selected drugs. Its inhibition results in increased systemic bile salt concentrations. NTCP is also the entry receptor for the hepatitis B/D virus. We investigated interindividual hepatic SLC10A1/NTCP expression using various omics technologies. SLC10A1/NTCP mRNA expression/protein abundance was quantified in well-characterized 143 human livers by real-time PCR and LC-MS/MS-based targeted proteomics. Genome-wide SNP arrays and SLC10A1 next-generation sequencing were used for genomic analyses. SLC10A1 DNA methylation was assessed through MALDI-TOF MS. Transcriptomics and untargeted metabolomics (UHPLC-Q-TOF-MS) were correlated to identify NTCP-related metabolic pathways. SLC10A1 mRNA and NTCP protein levels varied 44-fold and 10.4-fold, respectively. Non-genetic factors (e.g., smoking, alcohol consumption) influenced significantly NTCP expression. Genetic variants in SLC10A1 or other genes do not explain expression variability which was validated in livers (n = 50) from The Cancer Genome Atlas. The identified two missense SLC10A1 variants did not impair transport function in transfectants. Specific CpG sites in SLC10A1 as well as single metabolic alterations and pathways (e.g., peroxisomal and bile acid synthesis) were significantly associated with expression. Inter-individual variability of NTCP expression is multifactorial with the contribution of clinical factors, DNA methylation, transcriptional regulation as well as hepatic metabolism, but not genetic variation.
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Affiliation(s)
- Roman Tremmel
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Anne T. Nies
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
- iFIT Cluster of Excellence (EXC2180) “Image Guided and Functionally Instructed Tumor Therapies”, University of Tuebingen, 72076 Tuebingen, Germany
| | - Barbara A. C. van Eijck
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Niklas Handin
- Department of Pharmacy, Uppsala University, 75123 Uppsala, Sweden; (N.H.); (F.Z.G.); (P.A.)
| | - Mathias Haag
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Stefan Winter
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Florian A. Büttner
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Charlotte Kölz
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Franziska Klein
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Pascale Mazzola
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Ute Hofmann
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Kathrin Klein
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
| | - Per Hoffmann
- Institute of Human Genetics, University of Bonn, 53127 Bonn, Germany; (P.H.); (M.M.N.)
- Division of Medical Genetics, Department of Biomedicine, University of Basel, 4001 Basel, Switzerland
| | - Markus M. Nöthen
- Institute of Human Genetics, University of Bonn, 53127 Bonn, Germany; (P.H.); (M.M.N.)
- Department of Genomics, Life & Brain Center, University of Bonn, 53127 Bonn, Germany
| | - Fabienne Z. Gaugaz
- Department of Pharmacy, Uppsala University, 75123 Uppsala, Sweden; (N.H.); (F.Z.G.); (P.A.)
| | - Per Artursson
- Department of Pharmacy, Uppsala University, 75123 Uppsala, Sweden; (N.H.); (F.Z.G.); (P.A.)
| | - Matthias Schwab
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
- iFIT Cluster of Excellence (EXC2180) “Image Guided and Functionally Instructed Tumor Therapies”, University of Tuebingen, 72076 Tuebingen, Germany
- Departments of Clinical Pharmacology, and of Pharmacy and Biochemistry, University of Tuebingen, 72076 Tuebingen, Germany
- Correspondence: ; Tel.: +49-711-8101-3700
| | - Elke Schaeffeler
- Dr. Margarete Fischer-Bosch Institute of Clinical Pharmacology, 70376 Stuttgart, Germany; (R.T.); (A.T.N.); (B.A.C.v.E.); (M.H.); (S.W.); (F.A.B.); (C.K.); (F.K.); (P.M.); (U.H.); (K.K.); (E.S.)
- University of Tuebingen, 72076 Tuebingen, Germany
- iFIT Cluster of Excellence (EXC2180) “Image Guided and Functionally Instructed Tumor Therapies”, University of Tuebingen, 72076 Tuebingen, Germany
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42
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Deng F, Kim KS, Moon J, Bae YH. Bile Acid Conjugation on Solid Nanoparticles Enhances ASBT-Mediated Endocytosis and Chylomicron Pathway but Weakens the Transcytosis by Inducing Transport Flow in a Cellular Negative Feedback Loop. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2201414. [PMID: 35652273 PMCID: PMC9313510 DOI: 10.1002/advs.202201414] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Indexed: 05/20/2023]
Abstract
Bile acid-modified nanoparticles provide a convenient strategy to improve oral bioavailability of poorly permeable drugs by exploiting specific interactions with bile acid transporters. However, the underlying mechanisms are unknown, especially considering the different absorption sites of free bile acids (ileum) and digested fat molecules from bile acid-emulsified fat droplets (duodenum). Here, glycocholic acid (GCA)-conjugated polystyrene nanoparticles (GCPNs) are synthesized and their transport in Caco-2 cell models is studied. GCA conjugation enhances the uptake by interactions with apical sodium-dependent bile acid transporter (ASBT). A new pathway correlated with both ASBT and chylomicron pathways is identified. Meanwhile, the higher uptake of GCPNs does not lead to higher transcytosis to the same degree compared with unmodified nanoparticles (CPNs). The pharmacological and genomics study confirm that GCA conjugation changes the endocytosis mechanisms and downregulates the cellular response to the transport at gene levels, which works as a negative feedback loop and explains the higher cellular retention of GCPNs. These findings offer a solid foundation in the bile acid-based nanomedicine design, with utilizing advantages of the ASBT-mediated uptake, as well as inspiration to take comprehensive consideration of the cellular response with more developed technologies.
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Affiliation(s)
- Feiyang Deng
- Department of Pharmaceutics and Pharmaceutical ChemistryCollege of PharmacyUniversity of Utah30 S 2000 ESalt Lake CityUT84112USA
| | - Kyoung Sub Kim
- Department of Pharmaceutics and Pharmaceutical ChemistryCollege of PharmacyUniversity of Utah30 S 2000 ESalt Lake CityUT84112USA
| | - Jiyoung Moon
- Department of Pharmaceutics and Pharmaceutical ChemistryCollege of PharmacyUniversity of Utah30 S 2000 ESalt Lake CityUT84112USA
| | - You Han Bae
- Department of Pharmaceutics and Pharmaceutical ChemistryCollege of PharmacyUniversity of Utah30 S 2000 ESalt Lake CityUT84112USA
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43
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Ung KL, Winkler M, Schulz L, Kolb M, Janacek DP, Dedic E, Stokes DL, Hammes UZ, Pedersen BP. Structures and mechanism of the plant PIN-FORMED auxin transporter. Nature 2022; 609:605-610. [PMID: 35768502 PMCID: PMC9477730 DOI: 10.1038/s41586-022-04883-y] [Citation(s) in RCA: 48] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 05/19/2022] [Indexed: 11/15/2022]
Abstract
Auxins are hormones that have central roles and control nearly all aspects of growth and development in plants1–3. The proteins in the PIN-FORMED (PIN) family (also known as the auxin efflux carrier family) are key participants in this process and control auxin export from the cytosol to the extracellular space4–9. Owing to a lack of structural and biochemical data, the molecular mechanism of PIN-mediated auxin transport is not understood. Here we present biophysical analysis together with three structures of Arabidopsis thaliana PIN8: two outward-facing conformations with and without auxin, and one inward-facing conformation bound to the herbicide naphthylphthalamic acid. The structure forms a homodimer, with each monomer divided into a transport and scaffold domain with a clearly defined auxin binding site. Next to the binding site, a proline–proline crossover is a pivot point for structural changes associated with transport, which we show to be independent of proton and ion gradients and probably driven by the negative charge of the auxin. The structures and biochemical data reveal an elevator-type transport mechanism reminiscent of bile acid/sodium symporters, bicarbonate/sodium symporters and sodium/proton antiporters. Our results provide a comprehensive molecular model for auxin recognition and transport by PINs, link and expand on a well-known conceptual framework for transport, and explain a central mechanism of polar auxin transport, a core feature of plant physiology, growth and development. Structural and biophysical analysis of the Arabidopsis thaliana auxin transporter PIN8 reveal that PIN transporters export auxin using an elevator mechanism.
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Affiliation(s)
- Kien Lam Ung
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Mikael Winkler
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Lukas Schulz
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Martina Kolb
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Dorina P Janacek
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany
| | - Emil Dedic
- Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - David L Stokes
- Skirball Institute of Biomolecular Medicine, Department of Cell Biology, New York University School of Medicine, New York, NY, USA
| | - Ulrich Z Hammes
- Plant Systems Biology, School of Life Sciences Weihenstephan, Technical University of Munich, Freising, Germany.
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Zakrzewicz D, Leidolf R, Kunz S, Müller SF, Neubauer A, Leiting S, Goldmann N, Lehmann F, Glebe D, Geyer J. Tyrosine 146 of the Human Na +/Taurocholate Cotransporting Polypeptide (NTCP) Is Essential for Its Hepatitis B Virus (HBV) Receptor Function and HBV Entry into Hepatocytes. Viruses 2022; 14:v14061259. [PMID: 35746730 PMCID: PMC9230856 DOI: 10.3390/v14061259] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 12/10/2022] Open
Abstract
Na+/taurocholate cotransporting polypeptide (NTCP, gene symbol SLC10A1) is a hepatic bile acid uptake carrier participating in the enterohepatic circulation of bile acids. Apart from its transporter function, NTCP acts as the high-affinity liver-specific receptor for the hepatitis B virus (HBV), which attaches via its preS1-peptide domain of the large surface protein to NTCP, subsequently leading to endocytosis of the virus/NTCP-receptor complex. Although the process of NTCP-dependent HBV infection of hepatocytes has received much attention over the last decade, the precise molecular sites of the virus/NTCP interaction have not been fully identified. Inspection of the primary protein sequence of human NTCP revealed 139YIYSRGIY146 as a highly conserved tyrosine-rich motif. To study the role of Y139, Y141 and Y146 amino acids in NTCP biology, the aforementioned residues were substituted with alanine, phenylalanine or glutamate (mimicking phosphorylation) using site-directed mutagenesis. Similar to wt NTCP, the Y139A, Y141A, Y146A, Y141F, Y146F, and Y146E mutants were expressed at the plasma membrane of HEK293 cells and exhibited intact bile acid transport function. Y146A, Y146E, and Y146F demonstrated transport kinetics comparable to wild-type NTCP with Km values of 57.3–112.4 µM and Vmax values of 6683–7579 pmol/mg protein/min. Only Y141E was transport deficient, most likely due to an intracellular accumulation of the mutant protein. Most importantly, Y146A and Y146E mutation completely abrogated binding of the viral preS1-peptide to NTCP, while the Y146F mutant of NTCP showed some residual binding competence for preS1. Consequently, the NTCP mutants Y146A and Y146E, when expressed in HepG2 hepatoma cells, showed complete loss of susceptibility for in vitro HBV infection. In conclusion, tyrosine 146, and to some extent tyrosine 141, both belonging to the tyrosine-rich motif 139YIYSRGIY146 of human NTCP, are newly identified amino acid residues that play an essential role in the interaction of HBV with its receptor NTCP and, thus, in the process of virus entry into hepatocytes.
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Affiliation(s)
- Dariusz Zakrzewicz
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
- Correspondence: ; Tel.: +49-641-99-38412
| | - Regina Leidolf
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
| | - Sebastian Kunz
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
| | - Simon Franz Müller
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
| | - Anita Neubauer
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
| | - Silke Leiting
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
| | - Nora Goldmann
- Institute of Medical Virology, National Reference Centre for Hepatitis B Viruses and Hepatitis D Viruses, German Center for Infection Research (DZIF, Partner Site Giessen-Marburg-Langen), Justus Liebig University Giessen, 35392 Giessen, Germany; (N.G.); (F.L.); (D.G.)
| | - Felix Lehmann
- Institute of Medical Virology, National Reference Centre for Hepatitis B Viruses and Hepatitis D Viruses, German Center for Infection Research (DZIF, Partner Site Giessen-Marburg-Langen), Justus Liebig University Giessen, 35392 Giessen, Germany; (N.G.); (F.L.); (D.G.)
| | - Dieter Glebe
- Institute of Medical Virology, National Reference Centre for Hepatitis B Viruses and Hepatitis D Viruses, German Center for Infection Research (DZIF, Partner Site Giessen-Marburg-Langen), Justus Liebig University Giessen, 35392 Giessen, Germany; (N.G.); (F.L.); (D.G.)
| | - Joachim Geyer
- Institute of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, 35392 Giessen, Germany; (R.L.); (S.K.); (S.F.M.); (A.N.); (S.L.); (J.G.)
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45
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Park JH, Iwamoto M, Yun JH, Uchikubo-Kamo T, Son D, Jin Z, Yoshida H, Ohki M, Ishimoto N, Mizutani K, Oshima M, Muramatsu M, Wakita T, Shirouzu M, Liu K, Uemura T, Nomura N, Iwata S, Watashi K, Tame JRH, Nishizawa T, Lee W, Park SY. Structural insights into the HBV receptor and bile acid transporter NTCP. Nature 2022; 606:1027-1031. [PMID: 35580630 PMCID: PMC9242859 DOI: 10.1038/s41586-022-04857-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 05/11/2022] [Indexed: 01/05/2023]
Abstract
Around 250 million people are infected with hepatitis B virus (HBV) worldwide1, and 15 million may also carry the satellite virus hepatitis D virus (HDV), which confers even greater risk of severe liver disease2. The HBV receptor has been identified as sodium taurocholate co-transporting polypeptide (NTCP), which interacts directly with the first 48 amino acid residues of the N-myristoylated N-terminal preS1 domain of the viral large protein3. Despite the pressing need for therapeutic agents to counter HBV, the structure of NTCP remains unsolved. This 349-residue protein is closely related to human apical sodium-dependent bile acid transporter (ASBT), another member of the solute carrier family SLC10. Crystal structures have been reported of similar bile acid transporters from bacteria4,5, and these models are believed to resemble closely both NTCP and ASBT. Here we have used cryo-electron microscopy to solve the structure of NTCP bound to an antibody, clearly showing that the transporter has no equivalent of the first transmembrane helix found in other SLC10 proteins, and that the N terminus is exposed on the extracellular face. Comparison of our structure with those of related proteins indicates a common mechanism of bile acid transport, but the NTCP structure displays an additional pocket formed by residues that are known to interact with preS1, presenting new opportunities for structure-based drug design. Cryo-electron structures of the hepatitis B virus receptor NTCP show a distinct membrane topology compared with other SLC10 proteins, but a common bile acid transport mechanism that is shared with related mammalian and bacterial proteins.
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Affiliation(s)
- Jae-Hyun Park
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Masashi Iwamoto
- Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Ji-Hye Yun
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea.,PCG-Biotech, Seoul, South Korea
| | - Tomomi Uchikubo-Kamo
- Laboratory for Protein Functional and Structural Biology, RIKEN Center for Biosystems Dynamics Research, Yokohama, Japan
| | - Donghwan Son
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Zeyu Jin
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan.,Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Hisashi Yoshida
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Mio Ohki
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Naito Ishimoto
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Kenji Mizutani
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Mizuki Oshima
- Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan.,Department of Biological Sciences, Tokyo University of Science, Noda, Japan
| | - Masamichi Muramatsu
- Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takaji Wakita
- Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
| | - Mikako Shirouzu
- Laboratory for Protein Functional and Structural Biology, RIKEN Center for Biosystems Dynamics Research, Yokohama, Japan
| | - Kehong Liu
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tomoko Uemura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Norimichi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,RIKEN SPring-8 Center, Sayo-gun, Japan
| | - Koichi Watashi
- Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan.,Department of Biological Sciences, Tokyo University of Science, Noda, Japan.,Research Center for Drug and Vaccine Development, Tokyo, Japan
| | - Jeremy R H Tame
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Tomohiro Nishizawa
- Laboratory of Biomembrane Dynamics, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Weontae Lee
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea. .,PCG-Biotech, Seoul, South Korea.
| | - Sam-Yong Park
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan.
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46
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Asami J, Kimura KT, Fujita-Fujiharu Y, Ishida H, Zhang Z, Nomura Y, Liu K, Uemura T, Sato Y, Ono M, Yamamoto M, Noda T, Shigematsu H, Drew D, Iwata S, Shimizu T, Nomura N, Ohto U. Structure of the bile acid transporter and HBV receptor NTCP. Nature 2022; 606:1021-1026. [PMID: 35580629 DOI: 10.1038/s41586-022-04845-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 05/09/2022] [Indexed: 12/16/2022]
Abstract
Chronic infection with hepatitis B virus (HBV) affects more than 290 million people worldwide, is a major cause of cirrhosis and hepatocellular carcinoma, and results in an estimated 820,000 deaths annually1,2. For HBV infection to be established, a molecular interaction is required between the large glycoproteins of the virus envelope (known as LHBs) and the host entry receptor sodium taurocholate co-transporting polypeptide (NTCP), a sodium-dependent bile acid transporter from the blood to hepatocytes3. However, the molecular basis for the virus-transporter interaction is poorly understood. Here we report the cryo-electron microscopy structures of human, bovine and rat NTCPs in the apo state, which reveal the presence of a tunnel across the membrane and a possible transport route for the substrate. Moreover, the cryo-electron microscopy structure of human NTCP in the presence of the myristoylated preS1 domain of LHBs, together with mutation and transport assays, suggest a binding mode in which preS1 and the substrate compete for the extracellular opening of the tunnel in NTCP. Our preS1 domain interaction analysis enables a mechanistic interpretation of naturally occurring HBV-insusceptible mutations in human NTCP. Together, our findings provide a structural framework for HBV recognition and a mechanistic understanding of sodium-dependent bile acid translocation by mammalian NTCPs.
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Affiliation(s)
- Jinta Asami
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | | | - Yoko Fujita-Fujiharu
- Laboratory of Ultrastructural Virology, Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan.,Laboratory of Ultrastructural Virology, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.,CREST, Japan Science and Technology Agency, Kawaguchi, Japan
| | - Hanako Ishida
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Zhikuan Zhang
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yayoi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kehong Liu
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Tomoko Uemura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yumi Sato
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Masatsugu Ono
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | | | - Takeshi Noda
- Laboratory of Ultrastructural Virology, Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan.,Laboratory of Ultrastructural Virology, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.,CREST, Japan Science and Technology Agency, Kawaguchi, Japan
| | | | - David Drew
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - So Iwata
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,RIKEN SPring-8 Center, Sayo-gun, Japan
| | - Toshiyuki Shimizu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Norimichi Nomura
- Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
| | - Umeharu Ohto
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
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47
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Goutam K, Ielasi FS, Pardon E, Steyaert J, Reyes N. Structural basis of sodium-dependent bile salt uptake into the liver. Nature 2022; 606:1015-1020. [PMID: 35545671 PMCID: PMC9242856 DOI: 10.1038/s41586-022-04723-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 04/04/2022] [Indexed: 02/08/2023]
Abstract
The liver takes up bile salts from blood to generate bile, enabling absorption of lipophilic nutrients and excretion of metabolites and drugs1. Human Na+–taurocholate co-transporting polypeptide (NTCP) is the main bile salt uptake system in liver. NTCP is also the cellular entry receptor of human hepatitis B and D viruses2,3 (HBV/HDV), and has emerged as an important target for antiviral drugs4. However, the molecular mechanisms underlying NTCP transport and viral receptor functions remain incompletely understood. Here we present cryo-electron microscopy structures of human NTCP in complexes with nanobodies, revealing key conformations of its transport cycle. NTCP undergoes a conformational transition opening a wide transmembrane pore that serves as the transport pathway for bile salts, and exposes key determinant residues for HBV/HDV binding to the outside of the cell. A nanobody that stabilizes pore closure and inward-facing states impairs recognition of the HBV/HDV receptor-binding domain preS1, demonstrating binding selectivity of the viruses for open-to-outside over inward-facing conformations of the NTCP transport cycle. These results provide molecular insights into NTCP ‘gated-pore’ transport and HBV/HDV receptor recognition mechanisms, and are expected to help with development of liver disease therapies targeting NTCP. Structural studies of human Na+–taurocholate co-transporting polypeptide in complex with nanobodies reveal mechanisms for bile salts transport and HBV recognition involving an open-pore intermediate state.
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Affiliation(s)
- Kapil Goutam
- Membrane Protein Mechanisms Group, European Institute of Chemistry and Biology, University of Bordeaux, CNRS-UMR5234, Pessac, France.,Membrane Protein Mechanisms Unit, Institut Pasteur, Paris, France
| | | | - Els Pardon
- Structural Biology Brussels, Vrije Universiteit Brussel, VUB, Brussels, Belgium.,VIB-VUB Center for Structural Biology, VIB, Brussels, Belgium
| | - Jan Steyaert
- Structural Biology Brussels, Vrije Universiteit Brussel, VUB, Brussels, Belgium.,VIB-VUB Center for Structural Biology, VIB, Brussels, Belgium
| | - Nicolas Reyes
- Membrane Protein Mechanisms Group, European Institute of Chemistry and Biology, University of Bordeaux, CNRS-UMR5234, Pessac, France. .,Membrane Protein Mechanisms Unit, Institut Pasteur, Paris, France.
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48
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Durník R, Šindlerová L, Babica P, Jurček O. Bile Acids Transporters of Enterohepatic Circulation for Targeted Drug Delivery. Molecules 2022; 27:molecules27092961. [PMID: 35566302 PMCID: PMC9103499 DOI: 10.3390/molecules27092961] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 04/24/2022] [Accepted: 05/02/2022] [Indexed: 12/29/2022] Open
Abstract
Bile acids (BAs) are important steroidal molecules with a rapidly growing span of applications across a variety of fields such as supramolecular chemistry, pharmacy, and biomedicine. This work provides a systematic review on their transport processes within the enterohepatic circulation and related processes. The focus is laid on the description of specific or less-specific BA transport proteins and their localization. Initially, the reader is provided with essential information about BAs′ properties, their systemic flow, metabolism, and functions. Later, the transport processes are described in detail and schematically illustrated, moving step by step from the liver via bile ducts to the gallbladder, small intestine, and colon; this description is accompanied by descriptions of major proteins known to be involved in BA transport. Spillage of BAs into systemic circulation and urine excretion are also discussed. Finally, the review also points out some of the less-studied areas of the enterohepatic circulation, which can be crucial for the development of BA-related drugs, prodrugs, and drug carrier systems.
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Affiliation(s)
- Robin Durník
- Department of Biochemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic;
| | - Lenka Šindlerová
- Department of Biophysics of Immune System, Institute of Biophysics, Czech Academy of Sciences, Královopolská 135, 61265 Brno, Czech Republic;
| | - Pavel Babica
- RECETOX, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Czech Republic;
| | - Ondřej Jurček
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
- CEITEC—Central European Institute of Technology, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
- Department of Natural Drugs, Faculty of Pharmacy, Masaryk University, Palackého 1946/1, 61200 Brno, Czech Republic
- Correspondence:
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49
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Li Y, Zhou J, Li T. Regulation of the HBV Entry Receptor NTCP and its Potential in Hepatitis B Treatment. Front Mol Biosci 2022; 9:879817. [PMID: 35495620 PMCID: PMC9039015 DOI: 10.3389/fmolb.2022.879817] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
Hepatitis B virus (HBV) is a globally prevalent human DNA virus responsible for more than 250 million cases of chronic liver infection, a condition that can lead to liver inflammation, cirrhosis, and hepatocellular carcinoma. Sodium taurocholate co-transporting polypeptide (NTCP), a transmembrane protein highly expressed in human hepatocytes and a mediator of bile acid transport, has been identified as the receptor responsible for the cellular entry of both HBV and its satellite, hepatitis delta virus (HDV). This has led to significant advances in our understanding of the HBV life cycle, especially the early steps of infection. HepG2-NTCP cells and human NTCP-expressing transgenic mice have been employed as the primary cell culture and animal models, respectively, for the study of HBV, and represent valuable approaches for investigating its basic biology and developing treatments for infection. However, the mechanisms involved in the regulation of NTCP transcription, translation, post-translational modification, and transport are still largely elusive. Improvements in our understanding of NTCP biology would likely facilitate the design of new therapeutic drugs for the prevention of the de novo infection of naïve hepatocytes. In this review, we provide critical findings regarding NTCP biology and discuss important questions that remain unanswered.
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Affiliation(s)
- Yan Li
- *Correspondence: Yan Li, ; Tianliang Li,
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50
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Ruggiero MJ, Malhotra S, Fenton AW, Swint-Kruse L, Karanicolas J, Hagenbuch B. Structural Plasticity Is a Feature of Rheostat Positions in the Human Na +/Taurocholate Cotransporting Polypeptide (NTCP). Int J Mol Sci 2022; 23:ijms23063211. [PMID: 35328632 PMCID: PMC8954283 DOI: 10.3390/ijms23063211] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/11/2022] [Accepted: 03/15/2022] [Indexed: 02/05/2023] Open
Abstract
In the Na+/taurocholate cotransporting polypeptide (NTCP), the clinically relevant S267F polymorphism occurs at a "rheostat position". That is, amino acid substitutions at this position ("S267X") lead to a wide range of functional outcomes. This result was particularly striking because molecular models predicted the S267X side chains are buried, and thus, usually expected to be less tolerant of substitutions. To assess whether structural tolerance to buried substitutions is widespread in NTCP, here we used Rosetta to model all 19 potential substitutions at another 13 buried positions. Again, only subtle changes in the calculated stabilities and structures were predicted. Calculations were experimentally validated for 19 variants at codon 271 ("N271X"). Results showed near wildtype expression and rheostatic modulation of substrate transport, implicating N271 as a rheostat position. Notably, each N271X substitution showed a similar effect on the transport of three different substrates and thus did not alter substrate specificity. This differs from S267X, which altered both transport kinetics and specificity. As both transport and specificity may change during protein evolution, the recognition of such rheostat positions may be important for evolutionary studies. We further propose that the presence of rheostat positions is facilitated by local plasticity within the protein structure. Finally, we note that identifying rheostat positions may advance efforts to predict new biomedically relevant missense variants in NTCP and other membrane transport proteins.
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Affiliation(s)
- Melissa J. Ruggiero
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS 66160, USA;
| | - Shipra Malhotra
- Program in Molecular Therapeutics, Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (S.M.); (J.K.)
| | - Aron W. Fenton
- Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center, Kansas City, KS 66160, USA; (A.W.F.); (L.S.-K.)
| | - Liskin Swint-Kruse
- Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center, Kansas City, KS 66160, USA; (A.W.F.); (L.S.-K.)
| | - John Karanicolas
- Program in Molecular Therapeutics, Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (S.M.); (J.K.)
| | - Bruno Hagenbuch
- Department of Pharmacology, Toxicology and Therapeutics, The University of Kansas Medical Center, Kansas City, KS 66160, USA;
- Correspondence:
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