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Bernardo-Seisdedos G, Schedlbauer A, Pereira-Ortuzar T, Mato JM, Millet O. Protoporphyrin IX Binds to Iron(II)-Loaded and to Zinc-Loaded Human Frataxin. Life (Basel) 2023; 13:life13010222. [PMID: 36676171 PMCID: PMC9866752 DOI: 10.3390/life13010222] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/14/2023]
Abstract
(1) Background: Human frataxin is an iron binding protein that participates in the biogenesis of iron sulfur clusters and enhances ferrochelatase activity. While frataxin association to other proteins has been extensively characterized up to the structural level, much less is known about the putative capacity of frataxin to interact with functionally related metabolites. In turn, current knowledge about frataxin's capacity to coordinate metal ions is limited to iron (II and III); (2) Methods: here, we used NMR spectroscopy, Molecular Dynamics, and Docking approaches to demonstrate new roles of frataxin; (3) Results: We demonstrate that frataxin also binds Zn2+ in a structurally similar way to Fe2+, but with lower affinity. In turn, both Fe2+-loaded and Zn2+-loaded frataxins specifically associate to protoporphyrin IX with micromolar affinity, while apo-frataxin does not bind to the porphyrin. Protoporphyrin IX association to metal-loaded frataxin shares the binding epitope with ferrochelatase; and (4) Conclusions: these findings expand the plethora of relevant molecular targets for frataxin and may help to elucidate the yet unknown different roles that this protein exerts in iron regulation and metabolism.
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Affiliation(s)
- Ganeko Bernardo-Seisdedos
- ATLAS Molecular Pharma, Bizkaia Science and Technology Park, 48160 Derio, Spain
- Precision Medicine and Metabolism Laboratory, CIC bioGUNE, Basque Research and Technology Alliance (BRTA), Bizkaia Science and Technology Park, 48160 Derio, Spain
| | - Andreas Schedlbauer
- Precision Medicine and Metabolism Laboratory, CIC bioGUNE, Basque Research and Technology Alliance (BRTA), Bizkaia Science and Technology Park, 48160 Derio, Spain
| | - Tania Pereira-Ortuzar
- Precision Medicine and Metabolism Laboratory, CIC bioGUNE, Basque Research and Technology Alliance (BRTA), Bizkaia Science and Technology Park, 48160 Derio, Spain
| | - José M. Mato
- Precision Medicine and Metabolism Laboratory, CIC bioGUNE, Basque Research and Technology Alliance (BRTA), Bizkaia Science and Technology Park, 48160 Derio, Spain
- Biomedical Research Network on Hepatic and Digestive Diseases (CIBEREHD), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Oscar Millet
- ATLAS Molecular Pharma, Bizkaia Science and Technology Park, 48160 Derio, Spain
- Precision Medicine and Metabolism Laboratory, CIC bioGUNE, Basque Research and Technology Alliance (BRTA), Bizkaia Science and Technology Park, 48160 Derio, Spain
- Biomedical Research Network on Hepatic and Digestive Diseases (CIBEREHD), Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence:
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Gabius HJ, Cudic M, Diercks T, Kaltner H, Kopitz J, Mayo KH, Murphy PV, Oscarson S, Roy R, Schedlbauer A, Toegel S, Romero A. What is the Sugar Code? Chembiochem 2021; 23:e202100327. [PMID: 34496130 PMCID: PMC8901795 DOI: 10.1002/cbic.202100327] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [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: 07/02/2021] [Revised: 09/07/2021] [Indexed: 12/18/2022]
Abstract
A code is defined by the nature of the symbols, which are used to generate information‐storing combinations (e. g. oligo‐ and polymers). Like nucleic acids and proteins, oligo‐ and polysaccharides are ubiquitous, and they are a biochemical platform for establishing molecular messages. Of note, the letters of the sugar code system (third alphabet of life) excel in coding capacity by making an unsurpassed versatility for isomer (code word) formation possible by variability in anomery and linkage position of the glycosidic bond, ring size and branching. The enzymatic machinery for glycan biosynthesis (writers) realizes this enormous potential for building a large vocabulary. It includes possibilities for dynamic editing/erasing as known from nucleic acids and proteins. Matching the glycome diversity, a large panel of sugar receptors (lectins) has developed based on more than a dozen folds. Lectins ‘read’ the glycan‐encoded information. Hydrogen/coordination bonding and ionic pairing together with stacking and C−H/π‐interactions as well as modes of spatial glycan presentation underlie the selectivity and specificity of glycan‐lectin recognition. Modular design of lectins together with glycan display and the nature of the cognate glycoconjugate account for the large number of post‐binding events. They give an entry to the glycan vocabulary its functional, often context‐dependent meaning(s), hereby building the dictionary of the sugar code.
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Affiliation(s)
- Hans-Joachim Gabius
- Institute of Physiological Chemistry, Faculty of Veterinary Medicine, Ludwig-Maximilians-University Munich, Veterinärstr. 13, 80539, Munich, Germany
| | - Maré Cudic
- Department of Chemistry and Biochemistry, Charles E. Schmidt College of Science, Florida Atlantic University, 777 Glades Road, Boca Raton, Florida, 33431, USA
| | - Tammo Diercks
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801 A, 48160, Derio, Bizkaia, Spain
| | - Herbert Kaltner
- Institute of Physiological Chemistry, Faculty of Veterinary Medicine, Ludwig-Maximilians-University Munich, Veterinärstr. 13, 80539, Munich, Germany
| | - Jürgen Kopitz
- Institute of Pathology, Department of Applied Tumor Biology, Faculty of Medicine, Ruprecht-Karls-University Heidelberg, Im Neuenheimer Feld 224, 69120, Heidelberg, Germany
| | - Kevin H Mayo
- Department of Biochemistry, Molecular Biology & Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Paul V Murphy
- CÚRAM - SFI Research Centre for Medical Devices and the, School of Chemistry, National University of Ireland Galway, University Road, Galway, H91 TK33, Ireland
| | - Stefan Oscarson
- Centre for Synthesis and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - René Roy
- Département de Chimie et Biochimie, Université du Québec à Montréal, Case Postale 888, Succ. Centre-Ville Montréal, Québec, H3C 3P8, Canada
| | - Andreas Schedlbauer
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801 A, 48160, Derio, Bizkaia, Spain
| | - Stefan Toegel
- Karl Chiari Lab for Orthopaedic Biology, Department of Orthopedics and Trauma Surgery, Medical University of Vienna, Vienna, Austria
| | - Antonio Romero
- Department of Structural and Chemical Biology, CIB Margarita Salas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
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Schedlbauer A, Iturrioz I, Ochoa-Lizarralde B, Diercks T, López-Alonso JP, Lavin JL, Kaminishi T, Çapuni R, Dhimole N, de Astigarraga E, Gil-Carton D, Fucini P, Connell SR. A conserved rRNA switch is central to decoding site maturation on the small ribosomal subunit. Sci Adv 2021; 7:7/23/eabf7547. [PMID: 34088665 PMCID: PMC8177701 DOI: 10.1126/sciadv.abf7547] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 04/20/2021] [Indexed: 05/03/2023]
Abstract
While a structural description of the molecular mechanisms guiding ribosome assembly in eukaryotic systems is emerging, bacteria use an unrelated core set of assembly factors for which high-resolution structural information is still missing. To address this, we used single-particle cryo-electron microscopy to visualize the effects of bacterial ribosome assembly factors RimP, RbfA, RsmA, and RsgA on the conformational landscape of the 30S ribosomal subunit and obtained eight snapshots representing late steps in the folding of the decoding center. Analysis of these structures identifies a conserved secondary structure switch in the 16S ribosomal RNA central to decoding site maturation and suggests both a sequential order of action and molecular mechanisms for the assembly factors in coordinating and controlling this switch. Structural and mechanistic parallels between bacterial and eukaryotic systems indicate common folding features inherent to all ribosomes.
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Affiliation(s)
- Andreas Schedlbauer
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Idoia Iturrioz
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Borja Ochoa-Lizarralde
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Tammo Diercks
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Jorge Pedro López-Alonso
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | | | - Tatsuya Kaminishi
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
- Department of Genetics, Graduate School of Medicine, Osaka University, Japan
| | - Retina Çapuni
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Neha Dhimole
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Elisa de Astigarraga
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - David Gil-Carton
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain
| | - Paola Fucini
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain.
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
| | - Sean R Connell
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160 Derio, Spain.
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
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4
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Schedlbauer A, Ochoa-Lizarralde B, Iturrioz I, Çapuni R, Diercks T, de Astigarraga E, Fucini P, Connell SR. Backbone and sidechain NMR assignments for the ribosome maturation factor RimP from Escherichia coli. Biomol NMR Assign 2020; 14:189-193. [PMID: 32303998 DOI: 10.1007/s12104-020-09943-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
Ribosome biogenesis is an energetically expensive and complex cellular process that involves the coordinated folding of the ribosomal RNA and dozens of ribosomal proteins. It proceeds along multiple parallel pathways and is guided by trans-acting factors called ribosome assembly factors. Although this process has been studied for decades, there are still many open questions regarding the role of the ribosome assembly factors in directing the folding of ribosome biogenesis intermediates. RimP is one of the early acting factors and guides the assembly of the small 30S ribosomal subunit by facilitating the binding of ribosomal proteins uS5 and uS12. Here we report the virtually complete 1H, 15N, and 13C chemical shift assignment of RimP from Escherichia coli. The NMR chemical shift data, deposited in the BMRB data bank under Accession No. 28014, indicates a widely folded protein composed of three alpha helices and eight beta strands.
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Affiliation(s)
- Andreas Schedlbauer
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Borja Ochoa-Lizarralde
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Idoia Iturrioz
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Retina Çapuni
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Tammo Diercks
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Elisa de Astigarraga
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Paola Fucini
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain.
- Basque Foundation for Science, IKERBASQUE, 48011, Bilbao, Spain.
| | - Sean R Connell
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain.
- Basque Foundation for Science, IKERBASQUE, 48011, Bilbao, Spain.
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Schedlbauer A, Iturrioz I, Ochoa-Lizarralde B, Çapuni R, Han X, de Astigarraga E, Diercks T, Fucini P, Connell SR. Backbone and sidechain NMR assignments for the ribosome maturation factor RbfA from Escherichia coli. Biomol NMR Assign 2020; 14:317-321. [PMID: 32671633 DOI: 10.1007/s12104-020-09969-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
RbfA (ribosome binding factor A; 15.2 kDa) is a protein involved in ribosome biogenesis and has been shown to be important for growth at low temperatures and to act as a suppressor for a cold-sensitive mutation (C23U) in the ribosomal RNA of the small 30S ribosomal subunit. The 3D structure of isolated RbfA has been determined from several organisms showing that RbfA has type-II KH-domain fold topology similar to the KH domain of another assembly factor, Era, whose overexpression can compensate for the deletion of rbfA, suppressing both the cold sensitivity and abnormal accumulation of 17S rRNA in rbfA knockout stains. Interestingly, a RbfAΔ25 variant used in previous NMR studies, truncated at the C-terminal domain to remove 25 unstructured residues causing aggregation at room temperature, was biologically active in the sense that it could complement a knock-out of wildtype RbfA, although it did not act as a suppressor for a 16S cold-sensitive mutation (C23U), nor did it interact stably with the 30S subunit. To complement this work, we report the 1H, 13C, and 15 N backbone and sidechain NMR resonance assignments of full length RbfA from Escherichia coli measured under physiological conditions (pH 7.6). This construct contains seven additional C-terminal residues from the cloning (i.e. one alanine and six residues from the HRV 3C cleavage site) and no aggregation issues were observed over a 1-week period at 293 K. The assignment data has been deposited in the BMRB data bank under Accession No. 27857.
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Affiliation(s)
- Andreas Schedlbauer
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Idoia Iturrioz
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Borja Ochoa-Lizarralde
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Retina Çapuni
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Xu Han
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Elisa de Astigarraga
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Tammo Diercks
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain
| | - Paola Fucini
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain.
- Basque Foundation for Science, IKERBASQUE, 48011, Bilbao, Spain.
| | - Sean R Connell
- Center for Cooperative Research in Biosciences (CIC bioGUNE), Basque Research and Technology Alliance (BRTA), Bizkaia Technology Park, Building 801A, 48160, Derio, Bizkaia, Spain.
- Basque Foundation for Science, IKERBASQUE, 48011, Bilbao, Spain.
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Schedlbauer A, Tamma G, Rodighiero S, Civello DA, Tamplenizza M, Ledolter K, Nofziger C, Patsch W, Konrat R, Paulmichl M, Dossena S. Author Correction: Binding of the protein ICln to α-integrin contributes to the activation of IClswell current. Sci Rep 2019; 9:17107. [PMID: 31728022 PMCID: PMC6856531 DOI: 10.1038/s41598-019-53690-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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7
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López-Alonso JP, Kaminishi T, Kikuchi T, Hirata Y, Iturrioz I, Dhimole N, Schedlbauer A, Hase Y, Goto S, Kurita D, Muto A, Zhou S, Naoe C, Mills DJ, Gil-Carton D, Takemoto C, Himeno H, Fucini P, Connell SR. RsgA couples the maturation state of the 30S ribosomal decoding center to activation of its GTPase pocket. Nucleic Acids Res 2017; 45:6945-6959. [PMID: 28482099 PMCID: PMC5499641 DOI: 10.1093/nar/gkx324] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Accepted: 04/19/2017] [Indexed: 01/18/2023] Open
Abstract
During 30S ribosomal subunit biogenesis, assembly factors are believed to prevent accumulation of misfolded intermediate states of low free energy that slowly convert into mature 30S subunits, namely, kinetically trapped particles. Among the assembly factors, the circularly permuted GTPase, RsgA, plays a crucial role in the maturation of the 30S decoding center. Here, directed hydroxyl radical probing and single particle cryo-EM are employed to elucidate RsgA΄s mechanism of action. Our results show that RsgA destabilizes the 30S structure, including late binding r-proteins, providing a structural basis for avoiding kinetically trapped assembly intermediates. Moreover, RsgA exploits its distinct GTPase pocket and specific interactions with the 30S to coordinate GTPase activation with the maturation state of the 30S subunit. This coordination validates the architecture of the decoding center and facilitates the timely release of RsgA to control the progression of 30S biogenesis.
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Affiliation(s)
- Jorge Pedro López-Alonso
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Tatsuya Kaminishi
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Takeshi Kikuchi
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Yuya Hirata
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Idoia Iturrioz
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Neha Dhimole
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Andreas Schedlbauer
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Yoichi Hase
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Simon Goto
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Daisuke Kurita
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Akira Muto
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Shu Zhou
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Chieko Naoe
- Division of Structural and Synthetic Biology, RIKEN Center for Life Science Technology, 1-7-22 Suehiro-cho, Tsurumi, Yokohama 230-0045, Japan
| | - Deryck J Mills
- Max Planck Institute of Biophysics, Department of Structural Biology, Max-von-Laue-Straße 3, D-60438 Frankfurt am Main, Germany
| | - David Gil-Carton
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain
| | - Chie Takemoto
- Division of Structural and Synthetic Biology, RIKEN Center for Life Science Technology, 1-7-22 Suehiro-cho, Tsurumi, Yokohama 230-0045, Japan
| | - Hyouta Himeno
- Department of Biochemistry and Molecular Biology, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Paola Fucini
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain.,IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
| | - Sean R Connell
- Molecular Recognition and Host-Pathogen Interactions, CIC bioGUNE, Bizkaia Technology Park, 48160 Derio, Spain.,IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
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Heidrich CG, Mitova S, Schedlbauer A, Connell SR, Fucini P, Steenbergen JN, Berens C. The Novel Aminomethylcycline Omadacycline Has High Specificity for the Primary Tetracycline-Binding Site on the Bacterial Ribosome. Antibiotics (Basel) 2016; 5:antibiotics5040032. [PMID: 27669321 PMCID: PMC5187513 DOI: 10.3390/antibiotics5040032] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [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: 03/27/2016] [Revised: 09/01/2016] [Accepted: 09/12/2016] [Indexed: 01/02/2023] Open
Abstract
Omadacycline is an aminomethylcycline antibiotic with potent activity against many Gram-positive and Gram-negative pathogens, including strains carrying the major efflux and ribosome protection resistance determinants. This makes it a promising candidate for therapy of severe infectious diseases. Omadacycline inhibits bacterial protein biosynthesis and competes with tetracycline for binding to the ribosome. Its interactions with the 70S ribosome were, therefore, analyzed in great detail and compared with tigecycline and tetracycline. All three antibiotics are inhibited by mutations in the 16S rRNA that mediate resistance to tetracycline in Brachyspira hyodysenteriae, Helicobacter pylori, Mycoplasma hominis, and Propionibacterium acnes. Chemical probing with dimethyl sulfate and Fenton cleavage with iron(II)-complexes of the tetracycline derivatives revealed that each antibiotic interacts in an idiosyncratic manner with the ribosome. X-ray crystallography had previously revealed one primary binding site for tetracycline on the ribosome and up to five secondary sites. All tetracyclines analyzed here interact with the primary site and tetracycline also with two secondary sites. In addition, each derivative displays a unique set of non-specific interactions with the 16S rRNA.
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Affiliation(s)
- Corina G Heidrich
- Microbiology, Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
| | - Sanya Mitova
- Microbiology, Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
| | | | - Sean R Connell
- Structural Biology Unit, CIC bioGUNE, 48160 Derio, Bizkaia, Spain.
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain.
| | - Paola Fucini
- Structural Biology Unit, CIC bioGUNE, 48160 Derio, Bizkaia, Spain.
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain.
| | | | - Christian Berens
- Microbiology, Department of Biology, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.
- Institute of Molecular Pathogenesis, Friedrich-Loeffler-Institut, 07743 Jena, Germany.
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9
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Kaminishi T, Schedlbauer A, Fabbretti A, Brandi L, Ochoa-Lizarralde B, He CG, Milón P, Connell SR, Gualerzi CO, Fucini P. Crystallographic characterization of the ribosomal binding site and molecular mechanism of action of Hygromycin A. Nucleic Acids Res 2015; 43:10015-25. [PMID: 26464437 PMCID: PMC4787777 DOI: 10.1093/nar/gkv975] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 08/20/2015] [Accepted: 08/22/2015] [Indexed: 11/13/2022] Open
Abstract
Hygromycin A (HygA) binds to the large ribosomal subunit and inhibits its peptidyl transferase (PT) activity. The presented structural and biochemical data indicate that HygA does not interfere with the initial binding of aminoacyl-tRNA to the A site, but prevents its subsequent adjustment such that it fails to act as a substrate in the PT reaction. Structurally we demonstrate that HygA binds within the peptidyl transferase center (PTC) and induces a unique conformation. Specifically in its ribosomal binding site HygA would overlap and clash with aminoacyl-A76 ribose moiety and, therefore, its primary mode of action involves sterically restricting access of the incoming aminoacyl-tRNA to the PTC.
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MESH Headings
- Binding Sites
- Cinnamates/chemistry
- Cinnamates/metabolism
- Cinnamates/pharmacology
- Crystallography, X-Ray
- Hygromycin B/analogs & derivatives
- Hygromycin B/chemistry
- Hygromycin B/metabolism
- Hygromycin B/pharmacology
- Models, Molecular
- Peptidyl Transferases/chemistry
- Peptidyl Transferases/drug effects
- Protein Synthesis Inhibitors/chemistry
- Protein Synthesis Inhibitors/metabolism
- Protein Synthesis Inhibitors/pharmacology
- RNA, Transfer, Amino Acyl/metabolism
- Ribosome Subunits, Large, Bacterial/chemistry
- Ribosome Subunits, Large, Bacterial/drug effects
- Ribosome Subunits, Large, Bacterial/enzymology
- Ribosome Subunits, Large, Bacterial/metabolism
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Affiliation(s)
- Tatsuya Kaminishi
- Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Andreas Schedlbauer
- Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Attilio Fabbretti
- Laboratory of Genetics, Department of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy
| | - Letizia Brandi
- Laboratory of Genetics, Department of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy
| | - Borja Ochoa-Lizarralde
- Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, 48160 Derio, Bizkaia, Spain
| | - Cheng-Guang He
- Laboratory of Genetics, Department of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy
| | - Pohl Milón
- School of Medicine, Faculty of Health Sciences, Universidad Peruana de Ciencias Aplicadas - UPC, Lima, L-33, Perú
| | - Sean R Connell
- Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, 48160 Derio, Bizkaia, Spain IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
| | - Claudio O Gualerzi
- Laboratory of Genetics, Department of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy
| | - Paola Fucini
- Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, 48160 Derio, Bizkaia, Spain IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
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10
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Gelis I, Vitzthum V, Dhimole N, Caporini MA, Schedlbauer A, Carnevale D, Connell SR, Fucini P, Bodenhausen G. Solid-state NMR enhanced by dynamic nuclear polarization as a novel tool for ribosome structural biology. J Biomol NMR 2013; 56:85-93. [PMID: 23689811 DOI: 10.1007/s10858-013-9721-2] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 03/07/2013] [Indexed: 06/02/2023]
Abstract
The impact of Nuclear Magnetic Resonance (NMR) on studies of large macromolecular complexes hinges on improvements in sensitivity and resolution. Dynamic nuclear polarization (DNP) in the solid state can offer improved sensitivity, provided sample preparation is optimized to preserve spectral resolution. For a few nanomoles of intact ribosomes and an 800 kDa ribosomal complex we demonstrate that the combination of DNP and magic-angle spinning NMR (MAS-NMR) allows one to overcome current sensitivity limitations so that homo- and heteronuclear (13)C and (15)N NMR correlation spectra can be recorded. Ribosome particles, directly pelleted and frozen into an NMR rotor, yield DNP signal enhancements on the order of ~25-fold and spectra that exhibit narrow linewidths, suitable for obtaining site-specific information. We anticipate that the same approach is applicable to other high molecular weight complexes.
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Affiliation(s)
- Ioannis Gelis
- Buchmann Institute for Molecular Life Sciences, Institute of Organic Chemistry and Chemical Biology, Goethe University Frankfurt, Max-von-Laue-Str. 15, 60438 Frankfurt am Main, Germany
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11
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Schedlbauer A, Gandini R, Kontaxis G, Paulmichl M, Furst J, Konrat R. The C-terminus of ICln is natively disordered but displays local structural preformation. Cell Physiol Biochem 2011; 28:1203-10. [PMID: 22179008 DOI: 10.1159/000335852] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2011] [Indexed: 11/19/2022] Open
Abstract
ICln is a vital, ubiquitously expressed protein with roles in cell volume regulation, angiogenesis, cell morphology, activation of platelets and RNA processing. In previous work we have determined the 3D structure of the N-terminus of ICln (residues 1-159), which folds into a PH-like domain followed by an unstructured region (residues H134 - Q159) containing protein-protein interaction sites. Here we present sequence-specific resonance assignments of the C-terminus (residues Q159 - H235) of ICln by NMR, and show that this region of the protein is intrinsically unstructured. By applying (13)Cα- (13)Cβ secondary chemical shifts to detect possible preferences for secondary structure elements we show that the C-terminus of ICln adopts a preferred α-helical organization between residues E170 and E187, and exists preferentially in extended conformations (β-strands) between residues D161 to Y168 and E217 to T223.
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12
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Platzer G, Schedlbauer A, Chemelli A, Ozdowy P, Coudevylle N, Auer R, Kontaxis G, Hartl M, Miles AJ, Wallace BA, Glatter O, Bister K, Konrat R. The metastasis-associated extracellular matrix protein osteopontin forms transient structure in ligand interaction sites. Biochemistry 2011; 50:6113-24. [PMID: 21609000 DOI: 10.1021/bi200291e] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Osteopontin (OPN) is an acidic hydrophilic glycophosphoprotein that was first identified as a major sialoprotein in bones. It functions as a cell attachment protein displaying a RGD cell adhesion sequence and as a cytokine that signals through integrin and CD44 cell adhesion molecules. OPN is also implicated in human tumor progression and cell invasion. OPN has intrinsic transforming activity, and elevated OPN levels promote metastasis. OPN gene expression is also strongly activated in avian fibroblasts simultaneously transformed by the v-myc and v-mil(raf) oncogenes. Here we have investigated the solution structure of a 220-amino acid recombinant OPN protein by an integrated structural biology approach employing bioinformatic sequence analysis, multidimensional nuclear magnetic resonance spectroscopy, synchrotron radiation circular dichroism spectroscopy, and small-angle X-ray scattering. These studies suggest that OPN is an intrinsically unstructured protein in solution. Although OPN does not fold into a single defined structure, its conformational flexibility significantly deviates from random coil-like behavior. OPN comprises distinct local secondary structure elements with reduced conformational flexibility and substantially populates a compact subspace displaying distinct tertiary contacts. These compacted regions of OPN encompass the binding sites for α(V)β(III) integrin and heparin. The conformational flexibility combined with the modular architecture of OPN may represent an important structural prerequisite for its functional diversity.
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Affiliation(s)
- Gerald Platzer
- Department of Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter Campus 5, A-1030 Vienna, Austria
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13
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Schedlbauer A, Coudevylle N, Auer R, Kloiber K, Tollinger M, Konrat R. Autocorrelation analysis of NOESY data provides residue compactness for folded and unfolded proteins. J Am Chem Soc 2009; 131:6038-9. [PMID: 19364097 DOI: 10.1021/ja8074067] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A novel spectral entropy interpretation for protein NOESY data is presented for the investigation of the spatial distribution of residues in protein structures without the requirement of NOE cross peak assignments. In this approach individual traces S(i)(omega) from a 3D (15)N NOESY-HSQC taken at frequency positions corresponding to different amide groups (residue position i) are subjected to a self-convolution procedure thus leading to the autocorrelation function C(i)(omega) of the NOESY-trace for a particular backbone residue position. The characteristic spatial surrounding of a particular residue position is reflected in the corresponding autocorrelation function and can be quantified by taking the (spectral) entropy S(nu) as an information measure. The feasibility of this novel approach is demonstrated with applications to the proteins Cyclophilin D and Osteopontin and the protein complex between the lipocalin Q83 and the bacterial siderophore Enterobactin. Typically, large entropy values were found for residues located in structurally loosely defined regions, whereas small entropy values were found for residues in hydrophobic core regions of the protein with tightly interacting side chains and distinct chemical shift patterns. The applications to the unfolded Osteopontin and the Q83/Enterobactin protein complex indicated that both local compaction of the polypeptide chain due to transiently formed structural elements and subtle changes in side-chain packing can be efficiently probed by this novel approach.
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Affiliation(s)
- Andreas Schedlbauer
- Institute of Biomolecular Structural Chemistry, Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
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14
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Schedlbauer A, Auer R, Ledolter K, Tollinger M, Kloiber K, Lichtenecker R, Ruedisser S, Hommel U, Schmid W, Konrat R, Kontaxis G. Direct methods and residue type specific isotope labeling in NMR structure determination and model-driven sequential assignment. J Biomol NMR 2008; 42:111-127. [PMID: 18762865 DOI: 10.1007/s10858-008-9268-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2008] [Revised: 08/08/2008] [Accepted: 08/13/2008] [Indexed: 05/26/2023]
Abstract
Direct methods in NMR based structure determination start from an unassigned ensemble of unconnected gaseous hydrogen atoms. Under favorable conditions they can produce low resolution structures of proteins. Usually a prohibitively large number of NOEs is required, to solve a protein structure ab-initio, but even with a much smaller set of distance restraints low resolution models can be obtained which resemble a protein fold. One problem is that at such low resolution and in the absence of a force field it is impossible to distinguish the correct protein fold from its mirror image. In a hybrid approach these ambiguous models have the potential to aid in the process of sequential backbone chemical shift assignment when (13)C(beta) and (13)C' shifts are not available for sensitivity reasons. Regardless of the overall fold they enhance the information content of the NOE spectra. These, combined with residue specific labeling and minimal triple-resonance data using (13)C(alpha) connectivity can provide almost complete sequential assignment. Strategies for residue type specific labeling with customized isotope labeling patterns are of great advantage in this context. Furthermore, this approach is to some extent error-tolerant with respect to data incompleteness, limited precision of the peak picking, and structural errors caused by misassignment of NOEs.
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Affiliation(s)
- Andreas Schedlbauer
- Institute of Biomolecular Structural Chemistry, Max F. Perutz Laboratories, University of Vienna, Campus Vienna Biocenter 5/1, Vienna, Austria
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15
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Schedlbauer A, Ozdowy P, Kontaxis G, Hartl M, Bister K, Konrat R. Backbone assignment of osteopontin, a cytokine and cell attachment protein implicated in tumorigenesis. Biomol NMR Assign 2008; 2:29-31. [PMID: 19636917 DOI: 10.1007/s12104-007-9076-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2007] [Accepted: 12/11/2007] [Indexed: 05/28/2023]
Abstract
OPN is an RGD-containing protein overexpressed in cells transformed by v-myc and v-mil(raf) oncogenes. Here we report the resonance assignment of recombinant quail OPN and provide NMR evidence that quail OPN is an intrinsically unstructured protein in solution.
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Affiliation(s)
- Andreas Schedlbauer
- Department of Biomolecular Structural Chemistry, Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter Campus 5, 1030 Vienna, Austria
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16
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Abstract
OBJECTIVE Poor patient adherence to lipid-lowering medication is a major contributory factor in the lack of success in treating hyperlipidaemia. The objective of this review was to assess the effect of adherence-enhancing interventions for lipid-lowering medication. DESIGN Systematic review of randomized controlled trials (RCTs). DATA SOURCES Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, PsycInfo and CINAHL for all-language publications in November 2005. Direct contact with authors of included RCTs. METHODS Two reviewers extracted data independently and assessed studies according to criteria outlined by the Cochrane Reviewers' Handbook. RESULTS Nine RCTs were included in the review. Substantial between-study heterogeneity made pooling of data inappropriate. Four out of nine RCTs reported significantly improved adherence rates. The interventions associated with improved adherence were simplification of drug regimen (absolute increase 11%), patient information and education (13%) and intensified patient care (8.6% and 24%). Duration of follow-up was short, ranging from 2 to 24 months. No clear pattern emerged with regard to different classes of lipid-lowering drugs and adherence levels. CONCLUSIONS Intensified patient care appears to be the most promising intervention in terms of improved adherence to lipid-lowering drugs. Numbers of trials are low and evidence is sparse. Important aspects to be addressed in future studies are long-term follow-up, effect of improved adherence on serum lipid levels and concurrent, economic evaluation of adherence-enhancing strategies.
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Affiliation(s)
- A Schedlbauer
- Division of Primary Care, School of Community Health Sciences, 13th Floor, Tower Building, University of Nottingham, Nottingham NG7 2RD.
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17
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Schedlbauer A, Hoffmann B, Kontaxis G, Rüdisser S, Hommel U, Konrat R. Automated backbone and side-chain assignment of mitochondrial matrix cyclophilin D. J Biomol NMR 2007; 38:267. [PMID: 17530183 DOI: 10.1007/s10858-006-9135-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Accepted: 11/23/2006] [Indexed: 05/15/2023]
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18
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Fürst J, Schedlbauer A, Gandini R, Garavaglia ML, Saino S, Gschwentner M, Sarg B, Lindner H, Jakab M, Ritter M, Bazzini C, Botta G, Meyer G, Kontaxis G, Tilly BC, Konrat R, Paulmichl M. ICln159 folds into a pleckstrin homology domain-like structure. Interaction with kinases and the splicing factor LSm4. J Biol Chem 2005; 280:31276-82. [PMID: 15905169 DOI: 10.1074/jbc.m500541200] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
ICln is a multifunctional protein involved in regulatory mechanisms as different as membrane ion transport and RNA splicing. The protein is water-soluble, and during regulatory volume decrease after cell swelling, it is able to migrate from the cytosol to the cell membrane. Purified, water-soluble ICln is able to insert into lipid bilayers to form ion channels. Here, we show that ICln159, a truncated ICln mutant, which is also able to form ion channels in lipid bilayers, belongs to the pleckstrin homology (PH) domain superfold family of proteins. The ICln PH domain shows unusual properties as it lacks the electrostatic surface polarization seen in classical PH domains. However, similar to many classical PH domain-containing proteins, ICln interacts with protein kinase C, and in addition, interacts with cAMP-dependent protein kinase and cGMP-dependent protein kinase type II but not cGMP-dependent protein kinase type Ibeta. A major phosphorylation site for all three kinases is Ser-45 within the ICln PH domain. Furthermore, ICln159 interacts with LSm4, a protein involved in splicing and mRNA degradation, suggesting that the ICln159 PH domain may serve as a protein-protein interaction platform.
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Affiliation(s)
- Johannes Fürst
- Department of Physiology and Medical Physics, Innsbruck Medical University, Fritz-Pregl Strasse 3, A-6020 Innsbruck, Austria
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Abstract
BACKGROUND Lipid lowering drugs are still widely underused, despite compelling evidence about their effectiveness in the treatment and prevention of cardiovascular disease. Poor patient adherence to medication regimen is a major factor in the lack of success in treating hyperlipidaemia. In this review we focus on interventions, which encourage patients at risk of heart disease or stroke to take lipid lowering medication regularly. OBJECTIVES To assess the effect of interventions aiming at improved adherence to lipid lowering drugs, focusing on measures of adherence and clinical outcomes. SEARCH STRATEGY We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, PsycInfo and CINAHL. Date of most recent search was in February 2003. No language restrictions were applied. SELECTION CRITERIA Randomised controlled trials of adherence-enhancing interventions to lipid lowering medication in adults for both primary and secondary prevention of cardiovascular disease in an ambulatory setting. DATA COLLECTION AND ANALYSIS Two reviewers extracted data independently and assessed studies according to criteria outlined by the Cochrane Reviewers' Handbook. MAIN RESULTS The eight studies found contained data on 5943 patients. Interventions could be stratified into four categories : 1. simplification of drug regimen, 2. patient information/education, 3. intensified patient care such as reminding and 4. complex behavioural interventions such as group sessions. Change in adherence ranged from -3% to 25% (decrease in adherence by 3% to increase in adherence by 25%). Three studies reported significantly improved adherence through simplification of drug regimen (category 1), improved patient information/education (category 2) and reminding (category 3). The fact that the successful interventions were evenly spread across the categories, does not suggest any advantage of one particular type of intervention. The methodological and analytical quality was generally low and results have to be considered with caution. Combining data was not appropriate due to the substantial heterogeneity between included randomised controlled trials (RCTs). REVIEWERS' CONCLUSIONS At this stage, no specific intervention aimed at improving adherence to lipid lowering drugs can be recommended. The lack of a gold standard method of measuring adherence is one major barrier in adherence research. More reliable data might be achieved by newer methods of measurement, more consistency in adherence assessment and longer duration of follow-up. Increased patient-centredness with emphasis on the patient's perspective and shared-decision-making might lead to more conclusive answers when searching for tools to encourage patients to take lipid lowering medication.
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Affiliation(s)
- A Schedlbauer
- Academic Unit of Primary Health Care, Department of Community Based Medicine, University of Bristol, Cotham House, Cotham Hill, Bristol, UK, BS6 6JL.
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Schedlbauer A, Kontaxis G, König M, Fürst J, Jakab M, Ritter M, Garavaglia L, Bottà G, Meyer G, Paulmichl M, Konrat R. Sequence-specific resonance assignments of ICln, an ion channel cloned from epithelial cells. J Biomol NMR 2003; 27:399-400. [PMID: 14512740 DOI: 10.1023/a:1025809828637] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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21
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Schedlbauer A, Schroeder K. Interventions to improve adherence to lipid lowering medication. THE COCHRANE DATABASE OF SYSTEMATIC REVIEWS 2003. [DOI: 10.1002/14651858.cd004371] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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