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Zhang Y, Zhai Y, Wei X, Yang X, Deng C, Li Q, Wang W, Hao R. Effects of grape seed procyanidins on the lipid metabolism of growing-finishing pigs based on transcriptomics and metabolomics analyses. Meat Sci 2024; 213:109504. [PMID: 38555738 DOI: 10.1016/j.meatsci.2024.109504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 03/23/2024] [Accepted: 03/27/2024] [Indexed: 04/02/2024]
Abstract
This study investigated how lipid metabolism in the longissimus thoracis is influenced by the diet supplemented with grape seed procyanidins (GSPs) in growing-finishing pigs. Forty-eight crossbred pigs were randomly assigned to four groups, each receiving a basal diet, or basal diet added with 150, 200, and 250 mg/kg GSPs. Transcriptomics and metabolomics were employed to explore differential gene and metabolite regulation. The expression of key lipid metabolism-related genes was tested via qRT-PCR, and the lipid and fatty acid composition of the longissimus thoracis were determined. Dietary GSPs at different concentrations upregulated lipoprotein lipase (LPL), which is involved in lipolysis, and significantly increased the mRNA expression levels of carnitine palmitoyltransferase-1B (CPT1B) and cluster of differentiation 36 (CD36), implicated in transmembrane transport of fatty acids. Dietary supplementation of GSPs at 200 or 250 mg/kg markedly reduced total cholesterol and triglyceride content in longissimus thoracis. Dietary GSPs significantly decreased the contents of low-density lipoprotein cholesterol and saturated fatty acids, while increasing unsaturated fatty acids. In conclusion, GSPs may regulate lipid metabolism, reducing cholesterol level, and improving fatty acid composition in the longissimus thoracis of growing-finishing pigs. Our findings provide evidence for the beneficial effects of GSPs as pig feed additives for improving lipid composition.
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Affiliation(s)
- Yue Zhang
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Yan Zhai
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Xinxin Wei
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Xu Yang
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Chao Deng
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Qinghong Li
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Weiwei Wang
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China
| | - Ruirong Hao
- College of Animal Science, Shanxi Agricultural University, Taigu 030801, China; Key Laboratory of Farm Animal Genetic Resources Exploration and Breeding of Shanxi Province, Taigu 030801, China.
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2
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Shobade SO, Zabotina OA, Nilsen-Hamilton M. Plant root associated chitinases: structures and functions. FRONTIERS IN PLANT SCIENCE 2024; 15:1344142. [PMID: 38362446 PMCID: PMC10867124 DOI: 10.3389/fpls.2024.1344142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Accepted: 01/05/2024] [Indexed: 02/17/2024]
Abstract
Chitinases degrade chitin, a linear homopolymer of β-1,4-linked N-acetyl-D-glucosamine (GlcNAc) residues found in the cell walls of fungi and the exoskeletons of arthropods. They are secreted by the roots into the rhizosphere, a complex and dynamic environment where intense nutrient exchange occurs between plants and microbes. Here we modeled, expressed, purified, and characterized Zea mays and Oryza sativa root chitinases, and the chitinase of a symbiotic bacterium, Chitinophaga oryzae 1303 for their activities with chitin, di-, tri-, and tetra-saccharides and Aspergillus niger, with the goal of determining their role(s) in the rhizosphere and better understanding the molecular mechanisms underlying plant-microbe interactions. We show that Zea mays basic endochitinase (ZmChi19A) and Oryza sativa chitinase (OsChi19A) are from the GH19 chitinase family. The Chitinophaga oryzae 1303 chitinase (CspCh18A) belongs to the GH18 family. The three enzymes have similar apparent K M values of (20-40 µM) for the substrate 4-MU-GlcNAc3. They vary in their pH and temperature optima with OsChi19A activity optimal between pH 5-7 and 30-40°C while ZmChi19A and CspCh18A activities were optimal at pH 7-9 and 50-60°C. Modeling and site-directed mutation of ZmChi19A identified the catalytic cleft and the active residues E147 and E169 strategically positioned at ~8.6Å from each other in the folded protein. Cleavage of 4-MU-GlcNAc3 was unaffected by the absence of the CBD but diminished in the absence of the flexible C-terminal domain. However, unlike for the soluble substrate, the CBD and the newly identified flexible C-terminal domain were vital for inhibiting Aspergillus niger growth. The results are consistent with the involvement of the plant chitinases in defense against pathogens like fungi that have chitin exoskeletons. In summary, we have characterized the functional features and structural domains necessary for the activity of two plant root chitinases that are believed to be involved in plant defense and a bacterial chitinase that, along with the plant chitinases, may participate in nutrient recycling in the rhizosphere.
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Affiliation(s)
- Samuel O. Shobade
- Ames National Laboratory, U. S. Department of Energy, Ames, IA, United States
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, United States
| | - Olga A. Zabotina
- Ames National Laboratory, U. S. Department of Energy, Ames, IA, United States
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, United States
| | - Marit Nilsen-Hamilton
- Ames National Laboratory, U. S. Department of Energy, Ames, IA, United States
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA, United States
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3
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A Study on Multiple Facets of Apolipoprotein A1 Milano. Appl Biochem Biotechnol 2023:10.1007/s12010-023-04330-2. [PMID: 36689166 DOI: 10.1007/s12010-023-04330-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/10/2023] [Indexed: 01/24/2023]
Abstract
For several strategies formulated to prevent atherosclerosis, Apolipoprotein A1 Milano (ApoA1M) remains a prime target. ApoA1M has been reported to have greater efficiency in reducing the incidence of coronary artery diseases. Furthermore, recombinant ApoA1M based mimetic peptide exhibits comparatively greater atheroprotective potential, offers a hope in reducing the burden of atherosclerosis in in vivo model system. The aim of this review is to emphasize on some of the observed ApoA1M structural and functional effects that are clinically and therapeutically meaningful that might converge on the basic role of ApoA1M in reducing the chances of glycation assisted ailments in diabetes. We also hypothesize that the nonenzymatic glycation prone arginine amino acid of ApoA1 gets replaced with cysteine residue and the rate of ApoA1 glycation may decrease due to change substitution of amino acid. Therefore, to circumvent the effect of ApoA1M glycation, the related mechanism should be explored at the cellular and functional levels, especially in respective experimental disease model in vivo.
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4
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B Uribe K, Benito-Vicente A, Martin C, Blanco-Vaca F, Rotllan N. (r)HDL in theranostics: how do we apply HDL's biology for precision medicine in atherosclerosis management? Biomater Sci 2021; 9:3185-3208. [PMID: 33949389 DOI: 10.1039/d0bm01838d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
High-density lipoproteins (HDL) are key players in cholesterol metabolism homeostasis since they are responsible for transporting excess cholesterol from peripheral tissues to the liver. Imbalance in this process, due to either excessive accumulation or impaired clearance, results in net cholesterol accumulation and increases the risk of cardiovascular disease (CVD). Therefore, significant effort has been focused on the development of therapeutic tools capable of either directly or indirectly enhancing HDL-guided reverse cholesterol transport (RCT). More recently, in light of the emergence of precision nanomedicine, there has been renewed research interest in attempting to take advantage of the development of advanced recombinant HDL (rHDL) for both therapeutic and diagnostic purposes. In this review, we provide an update on the different approaches that have been developed using rHDL, focusing on the rHDL production methodology and rHDL applications in theranostics. We also compile a series of examples highlighting potential future perspectives in the field.
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Affiliation(s)
- Kepa B Uribe
- Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA), Paseo de Miramon 182, 20014, Donostia San Sebastián, Spain.
| | - Asier Benito-Vicente
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, Apdo.644, 48080 Bilbao, Spain.
| | - Cesar Martin
- Instituto Biofisika (UPV/EHU, CSIC) and Departamento de Bioquímica, Universidad del País Vasco, Apdo.644, 48080 Bilbao, Spain.
| | - Francisco Blanco-Vaca
- Servei de Bioquímica, Hospital Santa Creu i Sant Pau-Institut d'Investigacions Biomèdiques (IIB) Sant Pau, 08041 Barcelona, Spain. and CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Barcelona, Spain and Departament de Bioquímica i Biología Molecular, Universitat Autònoma de Barcelona, Spain and Institut de Recerca de l'Hospital Santa Creu i Sant Pau-Institut d'Investigacions Biomèdiques (IIB) Sant Pau, 08025 Barcelona, Spain.
| | - Noemi Rotllan
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Barcelona, Spain and Institut de Recerca de l'Hospital Santa Creu i Sant Pau-Institut d'Investigacions Biomèdiques (IIB) Sant Pau, 08025 Barcelona, Spain.
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5
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Waldie S, Sebastiani F, Moulin M, Del Giudice R, Paracini N, Roosen-Runge F, Gerelli Y, Prevost S, Voss JC, Darwish TA, Yepuri N, Pichler H, Maric S, Forsyth VT, Haertlein M, Cárdenas M. ApoE and ApoE Nascent-Like HDL Particles at Model Cellular Membranes: Effect of Protein Isoform and Membrane Composition. Front Chem 2021; 9:630152. [PMID: 33996741 PMCID: PMC8117676 DOI: 10.3389/fchem.2021.630152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 03/30/2021] [Indexed: 11/13/2022] Open
Abstract
Apolipoprotein E (ApoE), an important mediator of lipid transportation in plasma and the nervous system, plays a large role in diseases such as atherosclerosis and Alzheimer's. The major allele variants ApoE3 and ApoE4 differ only by one amino acid. However, this difference has major consequences for the physiological behaviour of each variant. In this paper, we follow (i) the initial interaction of lipid-free ApoE variants with model membranes as a function of lipid saturation, (ii) the formation of reconstituted High-Density Lipoprotein-like particles (rHDL) and their structural characterisation, and (iii) the rHDL ability to exchange lipids with model membranes made of saturated lipids in the presence and absence of cholesterol [1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) or 1-palmitoyl-2-oleoyl-glycero-3-phosphocholine (POPC) with and without 20 mol% cholesterol]. Our neutron reflection results demonstrate that the protein variants interact differently with the model membranes, adopting different protein conformations. Moreover, the ApoE3 structure at the model membrane is sensitive to the level of lipid unsaturation. Small-angle neutron scattering shows that the ApoE containing lipid particles form elliptical disc-like structures, similar in shape but larger than nascent or discoidal HDL based on Apolipoprotein A1 (ApoA1). Neutron reflection shows that ApoE-rHDL do not remove cholesterol but rather exchange saturated lipids, as occurs in the brain. In contrast, ApoA1-containing particles remove and exchange lipids to a greater extent as occurs elsewhere in the body.
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Affiliation(s)
- Sarah Waldie
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden.,Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Federica Sebastiani
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Martine Moulin
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Rita Del Giudice
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Nicolò Paracini
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Felix Roosen-Runge
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Yuri Gerelli
- Institut Laue-Langevin, Grenoble, France.,Department of Life and Environmental Sciences, Marche Polytechnic University, Ancona, Italy
| | | | - John C Voss
- Department of Biochemistry and Molecular Medicine, University of California, Davis, Davis, CA, United States
| | - Tamim A Darwish
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Nageshwar Yepuri
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Harald Pichler
- Austrian Centre of Industrial Biotechnology, Graz, Austria.,Graz University of Technology, Institute of Molecular Biotechnology, NAWI Graz, BioTechMed Graz, Graz, Austria
| | | | - V Trevor Forsyth
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France.,Faculty of Natural Sciences, Keele University, Staffordshire, United Kingdom
| | - Michael Haertlein
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Marité Cárdenas
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
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Nilsson O, Lindvall M, Obici L, Ekström S, Lagerstedt JO, Del Giudice R. Structure dynamics of ApoA-I amyloidogenic variants in small HDL increase their ability to mediate cholesterol efflux. J Lipid Res 2020; 62:100004. [PMID: 33410751 PMCID: PMC7890215 DOI: 10.1194/jlr.ra120000920] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 11/04/2020] [Accepted: 11/17/2020] [Indexed: 01/17/2023] Open
Abstract
Apolipoprotein A-I (ApoA-I) of high density lipoproteins (HDLs) is essential for the transportation of cholesterol between peripheral tissues and the liver. However, specific mutations in ApoA-I of HDLs are responsible for a late-onset systemic amyloidosis, the pathological accumulation of protein fibrils in tissues and organs. Carriers of these mutations do not exhibit increased cardiovascular disease risk despite displaying reduced levels of ApoA-I/HDL cholesterol. To explain this paradox, we show that the HDL particle profiles of patients carrying either L75P or L174S ApoA-I amyloidogenic variants show a higher relative abundance of the 8.4-nm versus 9.6-nm particles and that serum from patients, as well as reconstituted 8.4- and 9.6-nm HDL particles (rHDL), possess increased capacity to catalyze cholesterol efflux from macrophages. Synchrotron radiation circular dichroism and hydrogen-deuterium exchange revealed that the variants in 8.4-nm rHDL have altered secondary structure composition and display a more flexible binding to lipids than their native counterpart. The reduced HDL cholesterol levels of patients carrying ApoA-I amyloidogenic variants are thus balanced by higher proportion of small, dense HDL particles, and better cholesterol efflux due to altered, region-specific protein structure dynamics.
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Affiliation(s)
- Oktawia Nilsson
- Department of Experimental Medical Science, Lund University, Lund, Sweden
| | - Mikaela Lindvall
- Department of Experimental Medical Science, Lund University, Lund, Sweden
| | - Laura Obici
- Amyloidosis Research & Treatment Centre, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Simon Ekström
- BioMS - Swedish National Infrastructure for Biological Mass Spectrometry, Lund University, Lund, Sweden
| | - Jens O Lagerstedt
- Department of Experimental Medical Science, Lund University, Lund, Sweden; Lund Institute of Advanced Neutron and X-ray Science (LINXS), Lund, Sweden.
| | - Rita Del Giudice
- Department of Experimental Medical Science, Lund University, Lund, Sweden.
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7
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Lau S, Middleton DA. Sensitive Morphological Characterization of Oriented High‐Density Lipoprotein Nanoparticles Using
31
P NMR Spectroscopy. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sophie Lau
- Department of Chemistry Lancaster University Lancaster LA1 4YB UK
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8
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Lau S, Middleton DA. Sensitive Morphological Characterization of Oriented High-Density Lipoprotein Nanoparticles Using 31 P NMR Spectroscopy. Angew Chem Int Ed Engl 2020; 59:18126-18130. [PMID: 32542937 PMCID: PMC7589421 DOI: 10.1002/anie.202004130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/10/2020] [Indexed: 12/20/2022]
Abstract
The biological function of high-density lipoprotein (HDL) nanoparticles, the so-called good cholesterol that is associated with a low risk of heart disease, depends on their composition, morphology, and size. The morphology of HDL particles composed of apolipoproteins, lipids and cholesterol is routinely visualised by transmission electron microscopy (TEM), but higher-resolution tools are needed to observe more subtle structural differences between particles of different composition. Here, reconstituted HDL formulations are oriented on glass substrates and solid-state 31 P NMR spectroscopy is shown to be highly sensitive to the surface curvature of the lipid headgroups. The spectra report potentially functionally important differences in the morphology of different HDL preparations that are not detected by TEM. This method provides new morphological insights into HDL comprising a naturally occurring apolipoprotein A-I mutant, which may be linked to its atheroprotective properties, and holds promise as a future research tool in the clinical analysis of plasma HDL.
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Affiliation(s)
- Sophie Lau
- Department of ChemistryLancaster UniversityLancasterLA1 4YBUK
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9
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10
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Del Giudice R, Lagerstedt JO. High-efficient bacterial production of human ApoA-I amyloidogenic variants. Protein Sci 2018; 27:2101-2109. [PMID: 30291643 PMCID: PMC6237697 DOI: 10.1002/pro.3522] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 09/26/2018] [Accepted: 10/01/2018] [Indexed: 12/17/2022]
Abstract
Apolipoprotein A-I (ApoA-I)-related amyloidosis is a rare disease caused by missense mutations in the APOA1 gene. These mutations lead to protein aggregation and abnormal accumulation of ApoA-I amyloid fibrils in heart, liver, kidneys, skin, nerves, ovaries, or testes. Consequently, the carriers are at risk of single- or multi-organ failure and of need of organ transplantation. Understanding the basic molecular structure and function of ApoA-I amyloidogenic variants, as well as their biological effects, is, therefore, of great interest. However, the intrinsic low stability of this type of proteins makes their overexpression and purification difficult. To overcome this barrier, we here describe an optimized production and purification procedure for human ApoA-I amyloidogenic proteins that efficiently provides between 46 mg and 91 mg (depending on the protein variant) of pure protein per liter of Escherichia coli culture. Structural integrity of the amyloidogenic and native ApoA-I proteins were verified by circular dichroism spectroscopy and intrinsic fluorescence analysis, and preserved functionality was demonstrated by use of a lipid clearance assay as well as by reconstitution of high-density lipoprotein (HDL) particles. In conclusion, the use of the described high-yield protein production system to obtain amyloidogenic ApoA-I proteins, and their native counterpart, will enable molecular and cellular experimental studies aimed to explain the molecular basis for this rare disease.
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Affiliation(s)
- Rita Del Giudice
- Department of Experimental Medical ScienceLund UniversityS‐221 84LundSweden
| | - Jens O. Lagerstedt
- Department of Experimental Medical ScienceLund UniversityS‐221 84LundSweden
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11
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Domingo-Espín J, Nilsson O, Bernfur K, Del Giudice R, Lagerstedt JO. Site-specific glycations of apolipoprotein A-I lead to differentiated functional effects on lipid-binding and on glucose metabolism. Biochim Biophys Acta Mol Basis Dis 2018; 1864:2822-2834. [PMID: 29802959 DOI: 10.1016/j.bbadis.2018.05.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 05/17/2018] [Accepted: 05/22/2018] [Indexed: 02/06/2023]
Abstract
Prolonged hyperglycemia in poorly controlled diabetes leads to an increase in reactive glucose metabolites that covalently modify proteins by non-enzymatic glycation reactions. Apolipoprotein A-I (apoA-I) of high-density lipoprotein (HDL) is one of the proteins that becomes glycated in hyperglycemia. The impact of glycation on apoA-I protein structure and function in lipid and glucose metabolism were investigated. ApoA-I was chemically glycated by two different glucose metabolites (methylglyoxal and glycolaldehyde). Synchrotron radiation and conventional circular dichroism spectroscopy were used to study apoA-I structure and stability. The ability to bind lipids was measured by lipid-clearance assay and native gel analysis, and cholesterol efflux was measured by using lipid-laden J774 macrophages. Diet induced obese mice with established insulin resistance, L6 rat and C2C12 mouse myocytes, as well as INS-1E rat insulinoma cells, were used to determine in vivo and in vitro glucose uptake and insulin secretion. Site-specific, covalent modifications of apoA-I (lysines or arginines) led to altered protein structure, reduced lipid binding capability and a reduced ability to catalyze cholesterol efflux from macrophages, partly in a modification-specific manner. The stimulatory effects of apoA-I on the in vivo glucose clearance were negatively affected when apoA-I was modified with methylglyoxal, but not with glycolaldehyde. The in vitro data showed that both glucose uptake in muscle cells and insulin secretion from beta cells were affected. Taken together, glycation modifications impair the apoA-I protein functionality in lipid and glucose metabolism, which is expected to have implications for diabetes patients with poorly controlled blood glucose.
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Affiliation(s)
- Joan Domingo-Espín
- Department of Experimental Medical Science, Lund University, S-221 84 Lund, Sweden
| | - Oktawia Nilsson
- Department of Experimental Medical Science, Lund University, S-221 84 Lund, Sweden
| | - Katja Bernfur
- Department of Biochemistry and Structural Biology, Lund University, S-221 84 Lund, Sweden
| | - Rita Del Giudice
- Department of Experimental Medical Science, Lund University, S-221 84 Lund, Sweden
| | - Jens O Lagerstedt
- Department of Experimental Medical Science, Lund University, S-221 84 Lund, Sweden.
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