1
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Novischi SYP, Karoly-Lakatos A, Chok K, Bonifer C, Becker-Baldus J, Glaubitz C. Probing the allosteric NBD-TMD crosstalk in the ABC transporter MsbA by solid-state NMR. Commun Biol 2024; 7:43. [PMID: 38182790 PMCID: PMC10770068 DOI: 10.1038/s42003-023-05617-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 11/21/2023] [Indexed: 01/07/2024] Open
Abstract
The ABC transporter MsbA plays a critical role in Gram-negative bacteria in the regulation of the outer membrane by translocating core-LPS across the inner membrane. Additionally, a broad substrate specificity for lipophilic drugs has been shown. The allosteric interplay between substrate binding in the transmembrane domains and ATP binding and turnover in the nucleotide-binding domains must be mediated via the NBD/TMD interface. Previous studies suggested the involvement of two intracellular loops called coupling helix 1 and 2 (CH1, CH2). Here, we demonstrate by solid-state NMR spectroscopy that substantial chemical shift changes within both CH1 and CH2 occur upon substrate binding, in the ATP hydrolysis transition state, and upon inhibitor binding. CH2 is domain-swapped within the MsbA structure, and it is noteworthy that substrate binding induces a larger response in CH2 compared to CH1. Our data demonstrate that CH1 and CH2 undergo structural changes as part of the TMD-NBD cross-talk.
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Affiliation(s)
- S Y Phoebe Novischi
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max von Laue Str. 9, 60438, Frankfurt, Germany
| | - Andrea Karoly-Lakatos
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max von Laue Str. 9, 60438, Frankfurt, Germany
| | - Kerby Chok
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max von Laue Str. 9, 60438, Frankfurt, Germany
| | - Christian Bonifer
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max von Laue Str. 9, 60438, Frankfurt, Germany
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max von Laue Str. 9, 60438, Frankfurt, Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max von Laue Str. 9, 60438, Frankfurt, Germany.
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2
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Becker-Baldus J, Yeliseev A, Joseph TT, Sigurdsson ST, Zoubak L, Hines K, Iyer MR, van den Berg A, Stepnowski S, Zmuda J, Gawrisch K, Glaubitz C. Probing the Conformational Space of the Cannabinoid Receptor 2 and a Systematic Investigation of DNP-Enhanced MAS NMR Spectroscopy of Proteins in Detergent Micelles. ACS Omega 2023; 8:32963-32976. [PMID: 37720784 PMCID: PMC10500644 DOI: 10.1021/acsomega.3c04681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 08/09/2023] [Indexed: 09/19/2023]
Abstract
Tremendous progress has been made in determining the structures of G-protein coupled receptors (GPCR) and their complexes in recent years. However, understanding activation and signaling in GPCRs is still challenging due to the role of protein dynamics in these processes. Here, we show how dynamic nuclear polarization (DNP)-enhanced magic angle spinning nuclear magnetic resonance in combination with a unique pair labeling approach can be used to study the conformational ensemble at specific sites of the cannabinoid receptor 2. To improve the signal-to-noise, we carefully optimized the DNP sample conditions and utilized the recently introduced AsymPol-POK as a polarizing agent. We could show qualitatively that the conformational space available to the protein backbone is different in different parts of the receptor and that a site in TM7 is sensitive to the nature of the ligand, whereas a site in ICL3 always showed large conformational freedom.
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Affiliation(s)
- Johanna Becker-Baldus
- Institute
of Biophysical Chemistry and Centre of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Alexei Yeliseev
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Thomas T. Joseph
- Department
of Anesthesiology and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Snorri Th. Sigurdsson
- Department
of Chemistry, Science Institute, University
of Iceland, Dunhaga 3, 107 Reykjavik, Iceland
| | - Lioudmila Zoubak
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Kirk Hines
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Malliga R. Iyer
- Section
on Medicinal Chemistry, National Institute
on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, Maryland 20852, United States
| | - Arjen van den Berg
- ThermoFisher
Scientific, 7335 Executive
Way, Frederick, Maryland 21704, United States
| | - Sam Stepnowski
- ThermoFisher
Scientific, 7335 Executive
Way, Frederick, Maryland 21704, United States
| | - Jon Zmuda
- ThermoFisher
Scientific, 7335 Executive
Way, Frederick, Maryland 21704, United States
| | - Klaus Gawrisch
- National
Institute on Alcohol Abuse and Alcoholism, National Institutes of
Health, Bethesda, Maryland 20852, United States
| | - Clemens Glaubitz
- Institute
of Biophysical Chemistry and Centre of Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
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3
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Kriebel CN, Asido M, Kaur J, Orth J, Braun P, Becker-Baldus J, Wachtveitl J, Glaubitz C. Structural and functional consequences of the H180A mutation of the light-driven sodium pump KR2. Biophys J 2023; 122:1003-1017. [PMID: 36528791 PMCID: PMC10111219 DOI: 10.1016/j.bpj.2022.12.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 12/04/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022] Open
Abstract
Krokinobacter eikastus rhodopsin 2 (KR2) is a light-driven pentameric sodium pump. Its ability to translocate cations other than protons and to create an electrochemical potential makes it an attractive optogenetic tool. Tailoring its ion-pumping characteristics by mutations is therefore of great interest. In addition, understanding the functional and structural consequences of certain mutations helps to derive a functional mechanism of ion selectivity and transfer of KR2. Based on solid-state NMR spectroscopy, we report an extensive chemical shift resonance assignment of KR2 within lipid bilayers. This data set was then used to probe site-resolved allosteric effects of sodium binding, which revealed multiple responsive sites including the Schiff base nitrogen and the NDQ motif. Based on this data set, the consequences of the H180A mutation are probed. The mutant is silenced in the presence of sodium while in its absence proton pumping is observed. Our data reveal specific long-range effects along the sodium transfer pathway. These experiments are complemented by time-resolved optical spectroscopy. Our data suggest a model in which sodium uptake by the mutant can still take place, while sodium release and backflow control are disturbed.
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Affiliation(s)
- Clara Nassrin Kriebel
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Marvin Asido
- Institute for Physical and Theoretical Chemistry, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Jagdeep Kaur
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Jennifer Orth
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Philipp Braun
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Josef Wachtveitl
- Institute for Physical and Theoretical Chemistry, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Frankfurt am Main, Germany.
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4
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Abstract
Microbial rhodopsins represent the most abundant phototrophic systems known today. A similar molecular architecture with seven transmembrane helices and a retinal cofactor linked to a lysine in helix 7 enables a wide range of functions including ion pumping, light-controlled ion channel gating, or sensing. Deciphering their molecular mechanisms therefore requires a combined consideration of structural, functional, and spectroscopic data in order to identify key factors determining their function. Important insight can be gained by solid-state NMR spectroscopy by which the large homo-oligomeric rhodopsin complexes can be studied directly within lipid bilayers. This chapter describes the methodological background and the necessary sample preparation requirements for the study of photointermediates, for the analysis of protonation states, H-bonding and chromophore conformations, for 3D structure determination, and for probing oligomer interfaces of microbial rhodopsins. The use of data extracted from these NMR experiments is discussed in the context of complementary biophysical methods.
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Affiliation(s)
- Clara Nassrin Kriebel
- Institute of Biophysical Chemistry, Goethe University Frankfurt, Frankfurt am Main, Germany
- Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry, Goethe University Frankfurt, Frankfurt am Main, Germany
- Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt am Main, Germany
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry, Goethe University Frankfurt, Frankfurt am Main, Germany.
- Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt am Main, Germany.
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5
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Becker-Baldus J, Leeder A, Brown LJ, Brown RCD, Bamann C, Glaubitz C. The Desensitized Channelrhodopsin-2 Photointermediate Contains 13 -cis, 15 -syn Retinal Schiff Base. Angew Chem Int Ed Engl 2021; 60:16442-16447. [PMID: 33973334 PMCID: PMC8362212 DOI: 10.1002/anie.202015797] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 03/18/2021] [Indexed: 11/13/2022]
Abstract
Channelrhodopsin‐2 (ChR2) is a light‐gated cation channel and was used to lay the foundations of optogenetics. Its dark state X‐ray structure has been determined in 2017 for the wild‐type, which is the prototype for all other ChR variants. However, the mechanistic understanding of the channel function is still incomplete in terms of structural changes after photon absorption by the retinal chromophore and in the framework of functional models. Hence, detailed information needs to be collected on the dark state as well as on the different photointermediates. For ChR2 detailed knowledge on the chromophore configuration in the different states is still missing and a consensus has not been achieved. Using DNP‐enhanced solid‐state MAS NMR spectroscopy on proteoliposome samples, we unambiguously determined the chromophore configuration in the desensitized state, and we show that this state occurs towards the end of the photocycle.
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Affiliation(s)
- Johanna Becker-Baldus
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438, Frankfurt, Germany
| | - Alexander Leeder
- Department of Chemistry, University of Southampton, Southampton, SO17 1BJ, UK
| | - Lynda J Brown
- Department of Chemistry, University of Southampton, Southampton, SO17 1BJ, UK
| | - Richard C D Brown
- Department of Chemistry, University of Southampton, Southampton, SO17 1BJ, UK
| | - Christian Bamann
- Max-Planck-Institute of Biophysics, Max-von-Laue-Str. 3, 60438, Frankfurt, Germany
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438, Frankfurt, Germany
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6
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Doroudgar M, Morstein J, Becker-Baldus J, Trauner D, Glaubitz C. How Photoswitchable Lipids Affect the Order and Dynamics of Lipid Bilayers and Embedded Proteins. J Am Chem Soc 2021; 143:9515-9528. [PMID: 34133158 DOI: 10.1021/jacs.1c03524] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Altering the properties of phospholipid membranes by light is an attractive option for the noninvasive manipulation of membrane proteins and cellular functions. Lipids with an azobenzene group within their acyl chains such as AzoPC are suitable tools for manipulating lipid order and dynamics through a light-induced trans-to-cis isomerization. However, the action of these photoswitchable lipids at the atomic level is still poorly understood. Here, liposomes containing AzoPC, POPE, and POPG have been characterized by solid-state NMR through chemical shift and dipolar CH order parameter measurements. Upon UV-light illumination, an efficient trans-to-cis conversion can be achieved resulting in a localized reduction of the CH order parameter within the bulk lipid acyl chains. This effect is even more pronounced in liposomes containing the integral membrane protein E. coli diacylglycerol kinase. The protein responds to the light-induced trans-to-cis isomerization by a site-specific increase in the molecular dynamics as observed by altered cross peak intensities in NCA spectra. This study represents a proof-of-concept demonstration for the use of photoswitchable lipids to modulate membrane properties by light for inducing dynamic changes within an embedded membrane protein.
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Affiliation(s)
- Mahmoudreza Doroudgar
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, 60438 Frankfurt, Germany
| | - Johannes Morstein
- Department of Chemistry, New York University, 31 Washington Place, New York, New York 10003, United States
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, 60438 Frankfurt, Germany
| | - Dirk Trauner
- Department of Chemistry, New York University, 31 Washington Place, New York, New York 10003, United States
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, 60438 Frankfurt, Germany
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7
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Jakdetchai O, Eberhardt P, Asido M, Kaur J, Kriebel CN, Mao J, Leeder AJ, Brown LJ, Brown RCD, Becker-Baldus J, Bamann C, Wachtveitl J, Glaubitz C. Probing the photointermediates of light-driven sodium ion pump KR2 by DNP-enhanced solid-state NMR. Sci Adv 2021; 7:7/11/eabf4213. [PMID: 33712469 PMCID: PMC7954446 DOI: 10.1126/sciadv.abf4213] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 01/29/2021] [Indexed: 06/10/2023]
Abstract
The functional mechanism of the light-driven sodium pump Krokinobacter eikastus rhodopsin 2 (KR2) raises fundamental questions since the transfer of cations must differ from the better-known principles of rhodopsin-based proton pumps. Addressing these questions must involve a better understanding of its photointermediates. Here, dynamic nuclear polarization-enhanced solid-state nuclear magnetic resonance spectroscopy on cryo-trapped photointermediates shows that the K-state with 13-cis retinal directly interconverts into the subsequent L-state with distinct retinal carbon chemical shift differences and an increased out-of-plane twist around the C14-C15 bond. The retinal converts back into an all-trans conformation in the O-intermediate, which is the key state for sodium transport. However, retinal carbon and Schiff base nitrogen chemical shifts differ from those observed in the KR2 dark state all-trans conformation, indicating a perturbation through the nearby bound sodium ion. Our findings are supplemented by optical and infrared spectroscopy and are discussed in the context of known three-dimensional structures.
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Affiliation(s)
- Orawan Jakdetchai
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Strasse 9, 60438 Frankfurt am Main, Germany
| | - Peter Eberhardt
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt am Main, Germany
| | - Marvin Asido
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt am Main, Germany
| | - Jagdeep Kaur
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Strasse 9, 60438 Frankfurt am Main, Germany
| | - Clara Nassrin Kriebel
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Strasse 9, 60438 Frankfurt am Main, Germany
| | - Jiafei Mao
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Strasse 9, 60438 Frankfurt am Main, Germany
| | - Alexander J Leeder
- Department of Chemistry, University of Southampton, Southampton SO17 1BJ, Great Britain
| | - Lynda J Brown
- Department of Chemistry, University of Southampton, Southampton SO17 1BJ, Great Britain
| | - Richard C D Brown
- Department of Chemistry, University of Southampton, Southampton SO17 1BJ, Great Britain
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Strasse 9, 60438 Frankfurt am Main, Germany
| | - Christian Bamann
- Max Planck Institute of Biophysics, Max von Laue Strasse 3, 60438 Frankfurt am Main, Germany
| | - Josef Wachtveitl
- Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max von Laue Strasse 7, 60438 Frankfurt am Main, Germany.
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance (BMRZ), Goethe University Frankfurt, Max von Laue Strasse 9, 60438 Frankfurt am Main, Germany.
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8
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de Mos J, Jakob A, Becker-Baldus J, Heckel A, Glaubitz C. Light-Induced Uncaging for Time-Resolved Observations of Biochemical Reactions by MAS NMR Spectroscopy. Chemistry 2020; 26:6789-6792. [PMID: 32240561 PMCID: PMC7317521 DOI: 10.1002/chem.202000770] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Indexed: 12/23/2022]
Abstract
Light‐induced activation of biomolecules by uncaging of photolabile protection groups has found many applications for triggering biochemical reactions with minimal perturbations directly within cells. Such an approach might also offer unique advantages for solid‐state NMR experiments on membrane proteins for initiating reactions within or at the membrane directly within the closed MAS rotor. Herein, we demonstrate that the integral membrane protein E. coli diacylglycerol kinase (DgkA), which catalyzes the phosphorylation of diacylglycerol, can be controlled by light under MAS‐NMR conditions. Uncaging of NPE‐ATP or of lipid substrate NPE‐DOG by in situ illumination triggers its enzymatic activity, which can be monitored by real‐time 31P‐MAS NMR. This proof‐of‐concept illustrates that combining MAS‐NMR with uncaging strategies and illumination methods offers new possibilities for controlling biochemical reactions at or within lipid bilayers.
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Affiliation(s)
- Julian de Mos
- Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438, Frankfurt am Main, Germany
| | - Andreas Jakob
- Institute for Organic Chemistry and Chemical Biology, Goethe University Frankfurt, Max-von-Laue-Str. 7, 60438, Frankfurt am Main, Germany
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438, Frankfurt am Main, Germany
| | - Alexander Heckel
- Institute for Organic Chemistry and Chemical Biology, Goethe University Frankfurt, Max-von-Laue-Str. 7, 60438, Frankfurt am Main, Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Max-von-Laue-Str. 9, 60438, Frankfurt am Main, Germany
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9
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Price DJ, Nair A, Becker-Baldus J, Glaubitz C, Kuentz M, Dressman J, Saal C. Incorporation of HPMCAS during loading of glibenclamide onto mesoporous silica improves dissolution and inhibits precipitation. Eur J Pharm Sci 2019; 141:105113. [PMID: 31655207 DOI: 10.1016/j.ejps.2019.105113] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 10/16/2019] [Accepted: 10/18/2019] [Indexed: 10/25/2022]
Abstract
Mesoporous silica has emerged as an enabling formulation for poorly soluble active pharmaceutical ingredients (APIs). Unlike other formulations, mesoporous silica typically does not inhibit precipitation of supersaturated API therefore, a suitable precipitation inhibitor (PI) should be added to increase absorption from the gastrointestinal (GI) tract. However, there is limited research about optimal processes for combining PIs with silica formulations. Typically, the PI is added by simply blending the API-loaded silica mechanically with the selected PI. This has the drawback of an additional blending step and may also not be optimal with regard to release of drug and PI. By contrast, loading PI simultaneously with the API onto mesoporous silica, i.e. co-incorporation, is attractive from both a performance and practical perspective. The aim of this study was to demonstrate the utility of a co-incorporation approach for combining PIs with silica formulations, and to develop a mechanistic rationale for improvement of the performance of silica formulations using the co-incorporation approach. The results indicate that co-incorporating HPMCAS with glibenclamide onto silica significantly improved the extent and duration of drug supersaturation in single-medium and transfer dissolution experiments. Extensive spectroscopic characterization of the formulation revealed that the improved performance was related to the formation of drug-polymer interactions already in the solid state; the immobilization of API-loaded silica on HPMCAS plates, which prevents premature release and precipitation of API; and drug-polymer proximity on disintegration of the formulation, allowing for rapid onset of precipitation inhibition. The data suggests that co-incorporating the PI with the API is appealing for silica formulations from both a practical and formulation performance perspective.
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Affiliation(s)
- Daniel J Price
- Merck KGaA, Darmstadt, Germany; Institute of Pharmaceutical Technology, Goethe University, Frankfurt, Germany.
| | | | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe University, Frankfurt, Germany
| | - Martin Kuentz
- University of Arts and Applied Sciences Northwestern Switzerland, Basel, Switzerland
| | - Jennifer Dressman
- Institute of Pharmaceutical Technology, Goethe University, Frankfurt, Germany
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10
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Kaur J, Kriebel CN, Eberhardt P, Jakdetchai O, Leeder AJ, Weber I, Brown LJ, Brown RC, Becker-Baldus J, Bamann C, Wachtveitl J, Glaubitz C. Solid-state NMR analysis of the sodium pump Krokinobacter rhodopsin 2 and its H30A mutant. J Struct Biol 2019; 206:55-65. [DOI: 10.1016/j.jsb.2018.06.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 05/05/2018] [Accepted: 06/02/2018] [Indexed: 12/26/2022]
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11
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Ntountaniotis D, Andreadelis I, Kellici TF, Karageorgos V, Leonis G, Christodoulou E, Kiriakidi S, Becker-Baldus J, Stylos EK, Chatziathanasiadou MV, Chatzigiannis CM, Damalas DE, Aksoydan B, Javornik U, Valsami G, Glaubitz C, Durdagi S, Thomaidis NS, Kolocouris A, Plavec J, Tzakos AG, Liapakis G, Mavromoustakos T. Host-Guest Interactions between Candesartan and Its Prodrug Candesartan Cilexetil in Complex with 2-Hydroxypropyl-β-cyclodextrin: On the Biological Potency for Angiotensin II Antagonism. Mol Pharm 2019; 16:1255-1271. [PMID: 30681344 DOI: 10.1021/acs.molpharmaceut.8b01212] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Renin-angiotensin aldosterone system inhibitors are for a long time extensively used for the treatment of cardiovascular and renal diseases. AT1 receptor blockers (ARBs or sartans) act as antihypertensive drugs by blocking the octapeptide hormone Angiotensin II to stimulate AT1 receptors. The antihypertensive drug candesartan (CAN) is the active metabolite of candesartan cilexetil (Atacand, CC). Complexes of candesartan and candesartan cilexetil with 2-hydroxylpropyl-β-cyclodextrin (2-HP-β-CD) were characterized using high-resolution electrospray ionization mass spectrometry and solid state 13C cross-polarization/magic angle spinning nuclear magnetic resonance (CP/MAS NMR) spectroscopy. The 13C CP/MAS results showed broad peaks especially in the aromatic region, thus confirming the strong interactions between cyclodextrin and drugs. This experimental evidence was in accordance with molecular dynamics simulations and quantum mechanical calculations. The synthesized and characterized complexes were evaluated biologically in vitro. It was shown that as a result of CAN's complexation, CAN exerts higher antagonistic activity than CC. Therefore, a formulation of CC with 2-HP-β-CD is not indicated, while the formulation with CAN is promising and needs further investigation. This intriguing result is justified by the binding free energy calculations, which predicted efficient CC binding to 2-HP-β-CD, and thus, the molecule's availability for release and action on the target is diminished. In contrast, CAN binding was not favored, and this may allow easy release for the drug to exert its bioactivity.
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Affiliation(s)
- Dimitrios Ntountaniotis
- Department of Chemistry, Laboratory of Organic Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Ioannis Andreadelis
- Department of Chemistry, Laboratory of Organic Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Tahsin F Kellici
- Department of Chemistry, Laboratory of Organic Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Vlasios Karageorgos
- Department of Pharmacology, School of Medicine , University of Crete , Heraklion, Crete 70013 , Greece
| | - Georgios Leonis
- Department of Chemistry, Laboratory of Organic Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Eirini Christodoulou
- Department of Pharmacy, Laboratory of Pharmaceutical Technology , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Sofia Kiriakidi
- Department of Chemistry, Laboratory of Organic Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry , Goethe University Frankfurt , Max-von-Laue-Str. 9 , 60438 Frankfurt , Germany
| | - Evgenios K Stylos
- Department of Chemistry, Section of Organic Chemistry and Biochemistry , University of Ioannina , Ioannina 45110 , Greece.,Department of Biological Applications and Technology, Biotechnology Laboratory , University of Ioannina , Ioannina 45110 , Greece
| | - Maria V Chatziathanasiadou
- Department of Chemistry, Section of Organic Chemistry and Biochemistry , University of Ioannina , Ioannina 45110 , Greece
| | - Christos M Chatzigiannis
- Department of Chemistry, Section of Organic Chemistry and Biochemistry , University of Ioannina , Ioannina 45110 , Greece
| | - Dimitrios E Damalas
- Department of Chemistry, Laboratory of Analytical Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Busecan Aksoydan
- Department of Biophysics, Computational Biology and Molecular Simulations Laboratory , Bahcesehir University , Istanbul 34349 , Turkey
| | - Uroš Javornik
- National Institute of Chemistry, Slovenian NMR Centre , SI-1001 Ljubljana , Slovenia
| | - Georgia Valsami
- Department of Pharmacy, Laboratory of Pharmaceutical Technology , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry , Goethe University Frankfurt , Max-von-Laue-Str. 9 , 60438 Frankfurt , Germany
| | - Serdar Durdagi
- Department of Biophysics, Computational Biology and Molecular Simulations Laboratory , Bahcesehir University , Istanbul 34349 , Turkey
| | - Nikolaos S Thomaidis
- Department of Chemistry, Laboratory of Analytical Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
| | - Antonios Kolocouris
- Department of Pharmacy, Section of Pharmaceutical Chemistry , National and Kapodistrian University of Athens , Athens 15771 , Greece
| | - Janez Plavec
- National Institute of Chemistry, Slovenian NMR Centre , SI-1001 Ljubljana , Slovenia
| | - Andreas G Tzakos
- Department of Chemistry, Section of Organic Chemistry and Biochemistry , University of Ioannina , Ioannina 45110 , Greece
| | - George Liapakis
- Department of Pharmacology, School of Medicine , University of Crete , Heraklion, Crete 70013 , Greece
| | - Thomas Mavromoustakos
- Department of Chemistry, Laboratory of Organic Chemistry , National and Kapodistrian University of Athens , Panepistimioupolis, Zografou 15771 , Greece
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12
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Tošner Z, Sarkar R, Becker-Baldus J, Glaubitz C, Wegner S, Engelke F, Glaser SJ, Reif B. Overcoming Volume Selectivity of Dipolar Recoupling in Biological Solid-State NMR Spectroscopy. Angew Chem Int Ed Engl 2018; 57:14514-14518. [DOI: 10.1002/anie.201805002] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/19/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Zdeněk Tošner
- Munich Center for Integrated Protein Science (CIPS-M) at, Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
- Dept. of Chemistry; Faculty of Science; Charles University; Hlavova 8 CZ-12842 Prague 2 Czech Republic
| | - Riddhiman Sarkar
- Munich Center for Integrated Protein Science (CIPS-M) at, Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
- Helmholtz-Zentrum München (HMGU); Deutsches Forschungszentrum für Gesundheit und Umwelt; Ingolstädter Landstr. 1 85764 Neuherberg Germany
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry & Center for, Biomolecular Magnetic Resonance; Goethe-University Frankfurt; Frankfurt 60438 Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry & Center for, Biomolecular Magnetic Resonance; Goethe-University Frankfurt; Frankfurt 60438 Germany
| | | | - Frank Engelke
- Bruker Biospin; Silberstreifen 4 76278 Rheinstetten Germany
| | - Steffen J. Glaser
- Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
| | - Bernd Reif
- Munich Center for Integrated Protein Science (CIPS-M) at, Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
- Helmholtz-Zentrum München (HMGU); Deutsches Forschungszentrum für Gesundheit und Umwelt; Ingolstädter Landstr. 1 85764 Neuherberg Germany
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13
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Tošner Z, Sarkar R, Becker-Baldus J, Glaubitz C, Wegner S, Engelke F, Glaser SJ, Reif B. Overcoming Volume Selectivity of Dipolar Recoupling in Biological Solid-State NMR Spectroscopy. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zdeněk Tošner
- Munich Center for Integrated Protein Science (CIPS-M) at, Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
- Dept. of Chemistry; Faculty of Science; Charles University; Hlavova 8 CZ-12842 Prague 2 Czech Republic
| | - Riddhiman Sarkar
- Munich Center for Integrated Protein Science (CIPS-M) at, Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
- Helmholtz-Zentrum München (HMGU); Deutsches Forschungszentrum für Gesundheit und Umwelt; Ingolstädter Landstr. 1 85764 Neuherberg Germany
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry & Center for, Biomolecular Magnetic Resonance; Goethe-University Frankfurt; Frankfurt 60438 Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry & Center for, Biomolecular Magnetic Resonance; Goethe-University Frankfurt; Frankfurt 60438 Germany
| | | | - Frank Engelke
- Bruker Biospin; Silberstreifen 4 76278 Rheinstetten Germany
| | - Steffen J. Glaser
- Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
| | - Bernd Reif
- Munich Center for Integrated Protein Science (CIPS-M) at, Department Chemie; Technische Universität München (TUM); Lichtenbergstr. 4 85747 Garching Germany
- Helmholtz-Zentrum München (HMGU); Deutsches Forschungszentrum für Gesundheit und Umwelt; Ingolstädter Landstr. 1 85764 Neuherberg Germany
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14
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Leeder AJ, Brown LJ, Becker-Baldus J, Mehler M, Glaubitz C, Brown RCD. Synthesis of isotopically labeled all-trans retinals for DNP-enhanced solid-state NMR studies of retinylidene proteins. J Labelled Comp Radiopharm 2018; 61:922-933. [PMID: 29080288 DOI: 10.1002/jlcr.3576] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 10/17/2017] [Indexed: 12/28/2022]
Abstract
Three all-trans retinals containing multiple 13 C labels have been synthesized to enable dynamic nuclear polarization enhanced solid-state magic angle spinning NMR studies of novel microbial retinylidene membrane proteins including proteorhodpsin and channelrhodopsin. The synthetic approaches allowed specific introduction of 13 C labels in ring substituents and at different positions in the polyene chain to probe structural features such as ring orientation and interaction of the chromophore with the protein in the ground state and in photointermediates. [10-18-13 C9 ]-All-trans-retinal (1b), [12,15-13 C2 ]-all-trans-retinal (1c), and [14,15-13 C2 ]-all-trans-retinal (1d) were synthesized in in 12, 8, and 7 linear steps from ethyl 2-oxocyclohexanecarboxylate (5) or β-ionone (4), respectively.
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Affiliation(s)
| | - Lynda J Brown
- Department of Chemistry, University of Southampton, Southampton, UK
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry, Goethe University Frankfurt, Frankfurt, Germany.,Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt, Germany
| | - Michaela Mehler
- Institute of Biophysical Chemistry, Goethe University Frankfurt, Frankfurt, Germany.,Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt, Germany
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry, Goethe University Frankfurt, Frankfurt, Germany.,Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt, Frankfurt, Germany
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15
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Mehler M, Eckert CE, Leeder AJ, Kaur J, Fischer T, Kubatova N, Brown LJ, Brown RCD, Becker-Baldus J, Wachtveitl J, Glaubitz C. Chromophore Distortions in Photointermediates of Proteorhodopsin Visualized by Dynamic Nuclear Polarization-Enhanced Solid-State NMR. J Am Chem Soc 2017; 139:16143-16153. [PMID: 29027800 DOI: 10.1021/jacs.7b05061] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Proteorhodopsin (PR) is the most abundant retinal protein on earth and functions as a light-driven proton pump. Despite extensive efforts, structural data for PR photointermediate states have not been obtained. On the basis of dynamic nuclear polarization (DNP)-enhanced solid-state NMR, we were able to analyze the retinal polyene chain between positions C10 and C15 as well as the Schiff base nitrogen in the ground state in comparison to light-induced, cryotrapped K- and M-states. A high M-state population could be achieved by preventing reprotonation of the Schiff base through a mutation of the primary proton donor (E108Q). Our data reveal unexpected large and alternating 13C chemical shift changes in the K-state propagating away from the Schiff base along the polyene chain. Furthermore, two different M-states have been observed reflecting the Schiff base reorientation after the deprotonation step. Our study provides novel insight into the photocycle of PR and also demonstrates the power of DNP-enhanced solid-state NMR to bridge the gap between functional and structural data and models.
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Affiliation(s)
- Michaela Mehler
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Carl Elias Eckert
- Institute for Physical and Theoretical Chemistry, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Alexander J Leeder
- Department of Chemistry, University of Southampton , Southampton SO17 1BJ, United Kingdom
| | - Jagdeep Kaur
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Tobias Fischer
- Institute for Physical and Theoretical Chemistry, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Nina Kubatova
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Lynda J Brown
- Department of Chemistry, University of Southampton , Southampton SO17 1BJ, United Kingdom
| | - Richard C D Brown
- Department of Chemistry, University of Southampton , Southampton SO17 1BJ, United Kingdom
| | - Johanna Becker-Baldus
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Josef Wachtveitl
- Institute for Physical and Theoretical Chemistry, Goethe-University Frankfurt , Frankfurt 60438, Germany
| | - Clemens Glaubitz
- Institute for Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt , Frankfurt 60438, Germany
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16
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Liossi ΑS, Ntountaniotis D, Kellici TF, Chatziathanasiadou MV, Megariotis G, Mania M, Becker-Baldus J, Kriechbaum M, Krajnc A, Christodoulou E, Glaubitz C, Rappolt M, Amenitsch H, Mali G, Theodorou DN, Valsami G, Pitsikalis M, Iatrou H, Tzakos AG, Mavromoustakos T. Exploring the interactions of irbesartan and irbesartan-2-hydroxypropyl-β-cyclodextrin complex with model membranes. Biochim Biophys Acta Biomembr 2017; 1859:1089-1098. [PMID: 28274845 DOI: 10.1016/j.bbamem.2017.03.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 02/15/2017] [Accepted: 03/03/2017] [Indexed: 10/20/2022]
Abstract
The interactions of irbesartan (IRB) and irbesartan-2-hydroxypropyl-β-cyclodextrin (HP-β-CD) complex with dipalmitoyl phosphatidylcholine (DPPC) bilayers have been explored utilizing an array of biophysical techniques ranging from differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), ESI mass spectrometry (ESI-MS) and solid state nuclear magnetic resonance (ssNMR). Molecular dynamics (MD) calculations have been also conducted to complement the experimental results. Irbesartan was found to be embedded in the lipid membrane core and to affect the phase transition properties of the DPPC bilayers. SAXS studies revealed that irbesartan alone does not display perfect solvation since some coexisting irbesartan crystallites are present. In its complexed form IRB gets fully solvated in the membranes showing that encapsulation of IRB in HP-β-CD may have beneficial effects in the ADME properties of this drug. MD experiments revealed the topological and orientational integration of irbesartan into the phospholipid bilayer being placed at about 1nm from the membrane centre.
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Affiliation(s)
- Αdamantia S Liossi
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Dimitrios Ntountaniotis
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Tahsin F Kellici
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece; Department of Chemistry, University of Ioannina, GR-45110, Greece
| | | | - Grigorios Megariotis
- School of Chemical Engineering, National Technical University of Athens, Athens, Greece
| | - Maria Mania
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece; Department of Chemistry, University of Patras, Rio 26510, Greece
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Manfred Kriechbaum
- Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9/5, A-8010 Graz, Austria
| | - Andraž Krajnc
- National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Eirini Christodoulou
- Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Michael Rappolt
- School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, UK
| | - Heinz Amenitsch
- Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9/5, A-8010 Graz, Austria
| | - Gregor Mali
- National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia
| | - Doros N Theodorou
- School of Chemical Engineering, National Technical University of Athens, Athens, Greece
| | - Georgia Valsami
- Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Marinos Pitsikalis
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Hermis Iatrou
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Andreas G Tzakos
- Department of Chemistry, University of Ioannina, GR-45110, Greece
| | - Thomas Mavromoustakos
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece; Department of Chemistry, York College and the Graduate Center of the City University of New York, 94-20 Guy R. Brewer Blvd., Jamaica, New York, 11451, United States.
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17
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Kaur H, Lakatos A, Spadaccini R, Vogel R, Hoffmann C, Becker-Baldus J, Ouari O, Tordo P, Mchaourab H, Glaubitz C. The ABC exporter MsbA probed by solid state NMR – challenges and opportunities. Biol Chem 2016; 396:1135-49. [PMID: 25849794 DOI: 10.1515/hsz-2015-0119] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 03/26/2015] [Indexed: 01/20/2023]
Abstract
ATP binding cassette (ABC) transporters form a superfamily of integral membrane proteins involved in translocation of substrates across the membrane driven by ATP hydrolysis. Despite available crystal structures and extensive biochemical data, many open questions regarding their transport mechanisms remain. Therefore, there is a need to explore spectroscopic techniques such as solid state NMR in order to bridge the gap between structural and mechanistic data. In this study, we investigate the feasibility of using Escherichia coli MsbA as a model ABC transporter for solid state NMR studies. We show that optimised solubilisation and reconstitution procedures enable preparing stable and homogenous protein samples. Depending on the duration of solubilisation, MsbA can be obtained in either an apo- or in a native lipid A bound form. Building onto these optimisations, the first promising MAS-NMR spectra with narrow lines have been recorded. However, further sensitivity improvements are required so that complex NMR experiments can be recorded within a reasonable amount of time. We therefore demonstrate the usability of paramagnetic doping for rapid data acquisition and explore dynamic nuclear polarisation as a method for general signal enhancement. Our results demonstrate that solid state NMR provides an opportunity to address important biological questions related to complex mechanisms of ABC transporters.
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18
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Mehler M, Eckert CE, Busche A, Kulhei J, Michaelis J, Becker-Baldus J, Wachtveitl J, Dötsch V, Glaubitz C. Assembling a Correctly Folded and Functional Heptahelical Membrane Protein by Protein Trans-splicing. J Biol Chem 2015; 290:27712-22. [PMID: 26405032 DOI: 10.1074/jbc.m115.681205] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Indexed: 01/27/2023] Open
Abstract
Protein trans-splicing using split inteins is well established as a useful tool for protein engineering. Here we show, for the first time, that this method can be applied to a membrane protein under native conditions. We provide compelling evidence that the heptahelical proteorhodopsin can be assembled from two separate fragments consisting of helical bundles A and B and C, D, E, F, and G via a splicing site located in the BC loop. The procedure presented here is on the basis of dual expression and ligation in vivo. Global fold, stability, and photodynamics were analyzed in detergent by CD, stationary, as well as time-resolved optical spectroscopy. The fold within lipid bilayers has been probed by high field and dynamic nuclear polarization-enhanced solid-state NMR utilizing a (13)C-labeled retinal cofactor and extensively (13)C-(15)N-labeled protein. Our data show unambiguously that the ligation product is identical to its non-ligated counterpart. Furthermore, our data highlight the effects of BC loop modifications onto the photocycle kinetics of proteorhodopsin. Our data demonstrate that a correctly folded and functionally intact protein can be produced in this artificial way. Our findings are of high relevance for a general understanding of the assembly of membrane proteins for elucidating intramolecular interactions, and they offer the possibility of developing novel labeling schemes for spectroscopic applications.
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Affiliation(s)
- Michaela Mehler
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
| | - Carl Elias Eckert
- Institute for Physical and Theoretical Chemistry, Goethe University Frankfurt, 60438 Frankfurt, Germany
| | - Alena Busche
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
| | - Jennifer Kulhei
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
| | - Jonas Michaelis
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
| | - Johanna Becker-Baldus
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
| | - Josef Wachtveitl
- Institute for Physical and Theoretical Chemistry, Goethe University Frankfurt, 60438 Frankfurt, Germany
| | - Volker Dötsch
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
| | - Clemens Glaubitz
- From the Institute for Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance and
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19
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Maciejko J, Mehler M, Kaur J, Lieblein T, Morgner N, Ouari O, Tordo P, Becker-Baldus J, Glaubitz C. Visualizing Specific Cross-Protomer Interactions in the Homo-Oligomeric Membrane Protein Proteorhodopsin by Dynamic-Nuclear-Polarization-Enhanced Solid-State NMR. J Am Chem Soc 2015; 137:9032-43. [DOI: 10.1021/jacs.5b03606] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | | | | | | | | | - Olivier Ouari
- Aix-Marseille Université,
CNRS, ICR, UMR 7273, 13013 Marseille, France
| | - Paul Tordo
- Aix-Marseille Université,
CNRS, ICR, UMR 7273, 13013 Marseille, France
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20
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Kellici TF, Ntountaniotis D, Leonis G, Chatziathanasiadou M, Chatzikonstantinou AV, Becker-Baldus J, Glaubitz C, Tzakos AG, Viras K, Chatzigeorgiou P, Tzimas S, Kefala E, Valsami G, Archontaki H, Papadopoulos MG, Mavromoustakos T. Investigation of the Interactions of Silibinin with 2-Hydroxypropyl-β-cyclodextrin through Biophysical Techniques and Computational Methods. Mol Pharm 2015; 12:954-65. [DOI: 10.1021/mp5008053] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Tahsin F. Kellici
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
- Department
of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Dimitrios Ntountaniotis
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
| | - Georgios Leonis
- Institute
of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | | | | | - Johanna Becker-Baldus
- Institute
of Biophysical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str.
9, 60438 Frankfurt, Germany
| | - Clemens Glaubitz
- Institute
of Biophysical Chemistry, Goethe University Frankfurt, Max-von-Laue-Str.
9, 60438 Frankfurt, Germany
| | - Andreas G. Tzakos
- Department
of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - Kyriakos Viras
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
| | - Petros Chatzigeorgiou
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
| | - Stavros Tzimas
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
| | - Evangelia Kefala
- Department
of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Georgia Valsami
- Department
of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou 15771, Greece
| | - Helen Archontaki
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
| | - Manthos G. Papadopoulos
- Institute
of Biology, Medicinal Chemistry and Biotechnology, National Hellenic Research Foundation, 48 Vas. Constantinou Avenue, 11635 Athens, Greece
| | - Thomas Mavromoustakos
- Department
of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou 15771, Greece
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21
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Mao J, Do NN, Scholz F, Reggie L, Mehler M, Lakatos A, Ong YS, Ullrich SJ, Brown LJ, Brown RCD, Becker-Baldus J, Wachtveitl J, Glaubitz C. Structural basis of the green-blue color switching in proteorhodopsin as determined by NMR spectroscopy. J Am Chem Soc 2014; 136:17578-90. [PMID: 25415762 DOI: 10.1021/ja5097946] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Proteorhodopsins (PRs) found in marine microbes are the most abundant retinal-based photoreceptors on this planet. PR variants show high levels of environmental adaptation, as their colors are tuned to the optimal wavelength of available light. The two major green and blue subfamilies can be interconverted through a L/Q point mutation at position 105. Here we reveal the structural basis behind this intriguing color-tuning effect. High-field solid-state NMR spectroscopy was used to visualize structural changes within green PR directly within the lipid bilayer upon introduction of the green-blue L105Q mutation. The observed effects are localized within the binding pocket and close to retinal carbons C14 and C15. Subsequently, magic-angle spinning (MAS) NMR spectroscopy with sensitivity enhancement by dynamic nuclear polarization (DNP) was applied to determine precisely the retinal structure around C14-C15. Upon mutation, a significantly stretched C14-C15 bond, deshielding of C15, and a slight alteration of the retinal chain's out-of-plane twist was observed. The L105Q blue switch therefore acts locally on the retinal itself and induces a conjugation defect between the isomerization region and the imine linkage. Consequently, the S0-S1 energy gap increases, resulting in the observed blue shift. The distortion of the chromophore structure also offers an explanation for the elongated primary reaction detected by pump-probe spectroscopy, while chemical shift perturbations within the protein can be linked to the elongation of late-photocycle intermediates studied by flash photolysis. Besides resolving a long-standing problem, this study also demonstrates that the combination of data obtained from high-field and DNP-enhanced MAS NMR spectroscopy together with time-resolved optical spectroscopy enables powerful synergies for in-depth functional studies of membrane proteins.
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Affiliation(s)
- Jiafei Mao
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe University Frankfurt , 60438 Frankfurt am Main, Germany
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22
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Jakdetchai O, Denysenkov V, Becker-Baldus J, Dutagaci B, Prisner TF, Glaubitz C. Dynamic nuclear polarization-enhanced NMR on aligned lipid bilayers at ambient temperature. J Am Chem Soc 2014; 136:15533-6. [PMID: 25333422 DOI: 10.1021/ja509799s] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Dynamic nuclear polarization (DNP)-enhanced solid-state NMR spectroscopy has been shown to hold great potential for functional studies of membrane proteins at low temperatures due to its great sensitivity improvement. There are, however, numerous applications for which experiments at ambient temperature are desirable and which would also benefit from DNP signal enhancement. Here, we demonstrate as a proof of concept that a significant signal increase for lipid bilayers under room-temperature conditions can be achieved by utilizing the Overhauser effect. Experiments were carried out on aligned bilayers at 400 MHz/263 GHz using a stripline structure combined with a Fabry-Perot microwave resonator. A signal enhancement of protons of up to -10 was observed. Our results demonstrate that Overhauser DNP at high field provides efficient polarization transfer within insoluble samples, which is driven by fast local molecular fluctuations. Furthermore, our experimental setup offers an attractive option for DNP-enhanced solid-state NMR on ordered membranes and provides a general perspective toward DNP at ambient temperatures.
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Affiliation(s)
- Orawan Jakdetchai
- Institute of Biophysical Chemistry and ‡Institute of Physical and Theoretical Chemistry, Center for Biomolecular Magnetic Resonance Frankfurt, Goethe University Frankfurt , 60438 Frankfurt am Main, Germany
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Ntountaniotis D, Kellici T, Tzakos A, Kolokotroni P, Tselios T, Becker-Baldus J, Glaubitz C, Lin S, Makriyannis A, Mavromoustakos T. The application of solid-state NMR spectroscopy to study candesartan cilexetil (TCV-116) membrane interactions. Comparative study with the AT1R antagonist drug olmesartan. Biochim Biophys Acta 2014; 1838:2439-50. [PMID: 24946142 DOI: 10.1016/j.bbamem.2014.06.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 06/05/2014] [Accepted: 06/09/2014] [Indexed: 10/25/2022]
Abstract
ΑΤ1 receptor (AT1R) antagonists exert their antihypertensive effects by preventing the vasoconstrictive hormone AngII to bind to the AT1 receptor. It has been proposed that these biological effects are mediated through a two-step mechanism reaction. In the first step, they are incorporated in the core of the lipid bilayers and in the second step they reach the active site of the receptor through lateral diffusion. In this model, drug/membrane interactions are key elements for the drugs achieving inhibition at the AT1 receptor. In this work, the interactions of the prodrug candesartan cilexetil (TCV-116) with lipid bilayers are studied at molecular detail. Solid-state (13)C-CP/MAS, 2D (1)H-(1)H NOESY NMR spectroscopy and in silico calculations are used. TCV-116 and olmesartan, another drug which acts as an AT1R antagonist are compared for their dynamic effects in lipid bilayers using solid-state (2)H-NMR. We find a similar localization of TCV-116 compared to other AT1 antagonists in the intermediate polar region. In addition, we can identify specific local interactions. These interactions may be associated in part with the discrete pharmacological profiles observed for different antagonists.
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Affiliation(s)
- Dimitrios Ntountaniotis
- National and Kapodistrian University of Athens, Department of Chemistry, Panepistimioupolis Zografou 15771, Athens, Greece.
| | - Tahsin Kellici
- National and Kapodistrian University of Athens, Department of Chemistry, Panepistimioupolis Zografou 15771, Athens, Greece; University of Ioannina, Department of Chemistry, 45110 Ioannina, Greece
| | - Andreas Tzakos
- University of Ioannina, Department of Chemistry, 45110 Ioannina, Greece
| | | | - Theodore Tselios
- University of Patras, Department of Chemistry, Patras 26500, Greece
| | - Johanna Becker-Baldus
- Goethe University Frankfurt, Institute of Biophysical Chemistry, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Clemens Glaubitz
- Goethe University Frankfurt, Institute of Biophysical Chemistry, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Sonyan Lin
- University of Connecticut, School of Pharmacy, Storrs, CT 06269, USA
| | | | - Thomas Mavromoustakos
- National and Kapodistrian University of Athens, Department of Chemistry, Panepistimioupolis Zografou 15771, Athens, Greece.
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Dutagaci B, Becker-Baldus J, Faraldo-Gómez JD, Glaubitz C. Ceramide-lipid interactions studied by MD simulations and solid-state NMR. Biochim Biophys Acta 2014; 1838:2511-9. [PMID: 24882733 DOI: 10.1016/j.bbamem.2014.05.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 05/20/2014] [Accepted: 05/21/2014] [Indexed: 01/08/2023]
Abstract
Ceramides play a key modulatory role in many cellular processes, which results from their effect on the structure and dynamics of biological membranes. In this study, we investigate the influence of C16-ceramide (C16) on the biophysical properties of DMPC lipid bilayers using solid-state NMR and atomistic molecular dynamics (MD) simulations. MD simulations and NMR measurements were carried out for a pure DMPC bilayer and for a 20% DMPC-C16 mixture. Calculated key structural properties, namely area per lipid, chain order parameters, and mass density profiles, indicate that C16 has an ordering effect on the DMPC bilayer. Furthermore, the simulations predict that specific hydrogen-bonds form between DMPC and C16 molecules. Multi-nuclear solid-state NMR was used to verify these theoretical predictions. Chain order parameters extracted from (13)C(1)H dipole couplings were measured for both lipid and ceramide and follow the trend suggested by the MD simulations. Furthermore, (1)H-MAS NMR experiments showed a direct contact between ceramide and lipids.
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Affiliation(s)
- Bercem Dutagaci
- Institute of Biophysical Chemistry, J.W. Goethe-University, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - Johanna Becker-Baldus
- Institute of Biophysical Chemistry, J.W. Goethe-University, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
| | - José D Faraldo-Gómez
- Theoretical Molecular Biophysics Section, National Heart, Lung & Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Clemens Glaubitz
- Institute of Biophysical Chemistry, J.W. Goethe-University, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany.
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25
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Mehler M, Scholz F, Ullrich SJ, Mao J, Braun M, Brown LJ, Brown RCD, Fiedler SA, Becker-Baldus J, Wachtveitl J, Glaubitz C. The EF loop in green proteorhodopsin affects conformation and photocycle dynamics. Biophys J 2014; 105:385-97. [PMID: 23870260 DOI: 10.1016/j.bpj.2013.06.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 06/10/2013] [Accepted: 06/11/2013] [Indexed: 11/20/2022] Open
Abstract
The proteorhodopsin family consists of retinal proteins of marine bacterial origin with optical properties adjusted to their local environments. For green proteorhodopsin, a highly specific mutation in the EF loop, A178R, has been found to cause a surprisingly large redshift of 20 nm despite its distance from the chromophore. Here, we analyze structural and functional consequences of this EF loop mutation by time-resolved optical spectroscopy and solid-state NMR. We found that the primary photoreaction and the formation of the K-like photo intermediate is almost pH-independent and slower compared to the wild-type, whereas the decay of the K-intermediate is accelerated, suggesting structural changes within the counterion complex upon mutation. The photocycle is significantly elongated mainly due to an enlarged lifetime of late photo intermediates. Multidimensional MAS-NMR reveals mutation-induced chemical shift changes propagating from the EF loop to the chromophore binding pocket, whereas dynamic nuclear polarization-enhanced (13)C-double quantum MAS-NMR has been used to probe directly the retinylidene conformation. Our data show a modified interaction network between chromophore, Schiff base, and counterion complex explaining the altered optical and kinetic properties. In particular, the mutation-induced distorted structure in the EF loop weakens interactions, which help reorienting helix F during the reprotonation step explaining the slower photocycle. These data lead to the conclusion that the EF loop plays an important role in proton uptake from the cytoplasm but our data also reveal a clear interaction pathway between the EF loop and retinal binding pocket, which might be an evolutionary conserved communication pathway in retinal proteins.
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Affiliation(s)
- Michaela Mehler
- Institute of Biophysical Chemistry and Centre for Biomolecular Magnetic Resonance, Goethe-University Frankfurt, Germany
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26
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Ong YS, Lakatos A, Becker-Baldus J, Pos KM, Glaubitz C. Detecting substrates bound to the secondary multidrug efflux pump EmrE by DNP-enhanced solid-state NMR. J Am Chem Soc 2013; 135:15754-62. [PMID: 24047229 DOI: 10.1021/ja402605s] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Escherichia coli EmrE, a homodimeric multidrug antiporter, has been suggested to offer a convenient paradigm for secondary transporters due to its small size. It contains four transmembrane helices and forms a functional dimer. We have probed the specific binding of substrates TPP(+) and MTP(+) to EmrE reconstituted into 1,2-dimyristoyl-sn-glycero-3-phosphocholine liposomes by (31)P MAS NMR. Our NMR data show that both substrates occupy the same binding pocket but also indicate some degree of heterogeneity of the bound ligand population, reflecting the promiscuous nature of ligand binding by multidrug efflux pumps. Direct interaction between (13)C-labeled TPP(+) and key residues within the EmrE dimer has been probed by through-space (13)C-(13)C correlation spectroscopy. This was made possible by the use of solid-state NMR enhanced by dynamic nuclear polarization (DNP) through which a 19-fold signal enhancement was achieved. Our data provide clear evidence for the long assumed direct interaction between substrates such as TPP(+) and the essential residue E14 in transmembrane helix 1. Our work also demonstrates the power of DNP-enhanced solid-state NMR at low temperatures for the study for secondary transporters, which are highly challenging for conventional NMR detection.
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Affiliation(s)
- Yean Sin Ong
- Institute of Biophysical Chemistry & Centre for Biomolecular Magnetic Resonance and ‡Institute of Biochemistry, Goethe University Frankfurt , Max-von-Laue-Str. 9, 60438 Frankfurt am Main, Germany
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27
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Janke C, Scholz F, Becker-Baldus J, Glaubitz C, Wood PG, Bamberg E, Wachtveitl J, Bamann C. Photocycle and vectorial proton transfer in a rhodopsin from the eukaryote Oxyrrhis marina. Biochemistry 2013; 52:2750-63. [PMID: 23586665 DOI: 10.1021/bi301412n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Retinylidene photoreceptors are ubiquitously present in marine protists as first documented by the identification of green proteorhodopsin (GPR). We present a detailed investigation of a rhodopsin from the protist Oxyrrhis marina (OR1) with respect to its spectroscopic properties and to its vectorial proton transport. Despite its homology to GPR, OR1's features differ markedly in its pH dependence. Protonation of the proton acceptor starts at pH below 4 and is sensitive to the ionic conditions. The mutation of a conserved histidine H62 did not influence the pK(a) value in a similar manner as in other proteorhodopsins where the charged histidine interacts with the proton acceptor forming the so-called His-Asp cluster. Mutational and pH-induced effects were further reflected in the temporal behavior upon light excitation ranging from femtoseconds to seconds. The primary photodynamics exhibits a high sensitivity to the environment of the proton acceptor D100 that are correlated to the different initial states. The mutation of the H62 does not affect photoisomerization at neutral pH. This is in agreement with NMR data indicating the absence of the His-Asp cluster. The subsequent steps in the photocycle revealed protonation reactions at the Schiff base coupled to proton pumping even at low pH. The main electrogenic steps are associated with the reprotonation of the Schiff base and internal proton donor. Hence, OR1 shows a different theme of the His-Asp organization where the low pK(a) of the proton acceptor is not dominated by this interaction, but by other electrostatic factors.
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Affiliation(s)
- Christian Janke
- Max-Planck-Institut für Biophysik, Max-von-Laue Strasse 3, 60438 Frankfurt am Main, Germany
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28
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Antzutkin ON, Iuga D, Filippov AV, Kelly RT, Becker-Baldus J, Brown SP, Dupree R. Hydrogen Bonding in Alzheimer’s Amyloid-β Fibrils Probed by15N{17O} REAPDOR Solid-State NMR Spectroscopy. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Antzutkin ON, Iuga D, Filippov AV, Kelly RT, Becker-Baldus J, Brown SP, Dupree R. Hydrogen Bonding in Alzheimer’s Amyloid-β Fibrils Probed by15N{17O} REAPDOR Solid-State NMR Spectroscopy. Angew Chem Int Ed Engl 2012; 51:10289-92. [DOI: 10.1002/anie.201203595] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Indexed: 02/06/2023]
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30
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Tillmann J, Meyer-Wegner F, Nadj A, Becker-Baldus J, Sinke T, Bolte M, Holthausen MC, Wagner M, Lerner HW. Unexpected Disproportionation of Tetramethylethylenediamine-Supported Perchlorodisilane Cl3SiSiCl3. Inorg Chem 2012; 51:8599-606. [DOI: 10.1021/ic301283m] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan Tillmann
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Frank Meyer-Wegner
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Andor Nadj
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Johanna Becker-Baldus
- Institut für Biophysikalische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 9, 60438 Frankfurt am Main, Germany
| | - Tanja Sinke
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Michael Bolte
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Max C. Holthausen
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Matthias Wagner
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
| | - Hans-Wolfram Lerner
- Institut für
Anorganische
Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Straße 7, 60438 Frankfurt am Main, Germany
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31
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Becker-Baldus J, Kemp TF, Past J, Reinhold A, Samoson A, Brown SP. Longer-range distances by spinning-angle-encoding solid-state NMR spectroscopy. Phys Chem Chem Phys 2011; 13:4514-8. [DOI: 10.1039/c0cp02364g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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32
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Lange V, Becker-Baldus J, Kunert B, van Rossum BJ, Casagrande F, Engel A, Roske Y, Scheffel FM, Schneider E, Oschkinat H. A MAS NMR study of the bacterial ABC transporter ArtMP. Chembiochem 2010; 11:547-55. [PMID: 20099290 DOI: 10.1002/cbic.200900472] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
ATP-binding cassette (ABC) transport systems facilitate the translocation of substances, like amino acids, across cell membranes energised by ATP hydrolysis. This work describes first structural studies on the ABC transporter ArtMP from Geobacillus stearothermophilus in native lipid environment by magic-angle spinning NMR spectroscopy. The 2D crystals of ArtMP and 3D crystals of isolated ArtP were prepared in different nucleotide-bound or -unbound states. From selectively (13)C,(15)N-labelled ArtP, several sequence-specific assignments were obtained, most of which could be transferred to spectra of ArtMP. Residues Tyr133 and Pro134 protrude directly into the ATP-binding pocket at the interface of the ArtP subunits, and hence, are sensitive monitors for structural changes during nucleotide binding and hydrolysis. Distinct sets of NMR shifts were obtained for ArtP with different phosphorylation states of the ligand. Indications were found for an asymmetric or inhomogeneous state of the ArtP dimer bound with triphosphorylated nucleotides. With this investigation, a model system was established for screening all functional states occurring in one ABC transporter in native lipid environment.
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Affiliation(s)
- Vivien Lange
- NMR-Supported Structural Biology, Leibniz-Institut für Molekulare Pharmakologie, R.-Rössle-Strasse 10, 13125 Berlin, Germany
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33
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Hung I, Uldry AC, Becker-Baldus J, Webber AL, Wong A, Smith ME, Joyce SA, Yates JR, Pickard CJ, Dupree R, Brown SP. Probing Heteronuclear 15N−17O and 13C−17O Connectivities and Proximities by Solid-State NMR Spectroscopy. J Am Chem Soc 2009; 131:1820-34. [DOI: 10.1021/ja805898d] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ivan Hung
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Anne-Christine Uldry
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Johanna Becker-Baldus
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Amy L. Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Alan Wong
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Mark E. Smith
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Siân A. Joyce
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Jonathan R. Yates
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Chris J. Pickard
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Ray Dupree
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
| | - Steven P. Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K., School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, U.K., Tyndall National Institute, Lee Maltings, Prospect Row, Cork, Ireland, and TCM Group, Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 OHE, U.K
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