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Your search keyword '"Salla I. Virtanen"' showing total 3 results
Start Over Author "Salla I. Virtanen" Topic biochemistry
3 results on '"Salla I. Virtanen"'

1. Inverse Conformational Selection in Lipid–Protein Binding

Author

Matti Javanainen, Salla I. Virtanen, Fernando Favela-Rosales, Chris Papadopoulos, Antonio Peón, Amélie Bacle, Anne M. Kiirikki, Patrick F.J. Fuchs, O. H. Samuli Ollila, Pavel Buslaev, Ángel Piñeiro, Rebeca García-Fandiño, Paula Milán Rodríguez, Tiago Mendes Ferreira, Markus S. Miettinen, Jesper J. Madsen, Josef Melcr, Ivan Gushchin, Thomas J. Piggot, Lipotoxicity and Channelopathies - ConicMeds (LitCh), Signalisation et Transports Ioniques Membranaires (STIM), Université de Poitiers-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Nanoscience Center [Jyväskylä Univ] (NSC@JYU), University of Jyväskylä (JYU), Moscow Institute of Physics and Technology [Moscow] (MIPT), Centro de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS ), Universidade de Santiago de Compostela [Spain] (USC ), Universidade do Porto = University of Porto, Tecnológico Nacional de México (TecNM), Martin-Luther-University Halle-Wittenberg, Laboratoire des biomolécules (LBM UMR 7203), Chimie Moléculaire de Paris Centre (FR 2769), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département de Chimie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), UFR Sciences du Vivant [Sciences] - Université Paris Cité (UFR SDV UPCité), Université Paris Cité (UPCité), Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences (IOCB / CAS), Czech Academy of Sciences [Prague] (CAS), HiLIFE - Institute of Biotechnology [Helsinki] (BI), Helsinki Institute of Life Science (HiLIFE), Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, University of Chicago, University of South Florida [Tampa] (USF), Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen [Groningen], Max Planck Institute of Colloids and Interfaces, Max-Planck-Gesellschaft, Institut de Biologie Intégrative de la Cellule (I2BC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), University of Southampton, Molecular Dynamics, Institute of Biotechnology, Biophysical chemistry, Gestionnaire, Hal Sorbonne Université, Université Paris Cité - UFR Sciences du Vivant [Sciences] (UPCité - UFR SDV), Université de Poitiers-Université de Tours-Centre National de la Recherche Scientifique (CNRS)-Université de Poitiers-Université de Tours-Centre National de la Recherche Scientifique (CNRS), Universidade do Porto, Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Département de Chimie - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Chimie Moléculaire de Paris Centre (FR 2769), Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Paris - UFR Sciences du Vivant [Sciences] (UP - UFR SDV), Université de Paris (UP), University of Helsinki-University of Helsinki, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), and Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
DYNAMICS, ELECTRIC CHARGE, BILAYERS, PHOSPHATIDYLCHOLINE HEADGROUP, Membrane lipids, DEUTERIUM, Plasma protein binding, Molecular Dynamics Simulation, lipidit, 010402 general chemistry, 01 natural sciences, Biochemistry, biomolekyylit, Catalysis, 03 medical and health sciences, Molecular dynamics, kemialliset sidokset, Colloid and Surface Chemistry, Protein structure, PHOSPHOLIPID-BINDING, MAGNETIC-RESONANCE, [SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology, SEGMENTAL ORDER, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Conformational ensembles, Nuclear Magnetic Resonance, Biomolecular, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, Chemistry, Biomolecule, MEMBRANE-LIPIDS, Proteins, Phosphatidylglycerols, General Chemistry, computer.file_format, Protein Data Bank, Lipids, 0104 chemical sciences, Biophysics, Phospholipid Binding, Phosphatidylcholines, MAS NMR, 1182 Biochemistry, cell and molecular biology, lipids (amino acids, peptides, and proteins), proteiinit, computer, Protein Binding
Abstract

International audience; Interest in lipid interactions with proteins and other biomolecules is emerging not only in fundamental biochemistry but also in the field of nanobiotechnology where lipids are commonly used, for example, in carriers of mRNA vaccines. The outward-facing components of cellular membranes and lipid nanoparticles, the lipid headgroups, regulate membrane interactions with approaching substances, such as proteins, drugs, RNA, or viruses. Because lipid headgroup conformational ensembles have not been experimentally determined in physiologically relevant conditions, an essential question about their interactions with other biomolecules remains unanswered: Do headgroups exchange between a few rigid structures, or fluctuate freely across a practically continuous spectrum of conformations? Here, we combine solid-state NMR experiments and molecular dynamics simulations from the NMRlipids Project to resolve the conformational ensembles of headgroups of four key lipid types in various biologically relevant conditions. We find that lipid headgroups sample a wide range of overlapping conformations in both neutral and charged cellular membranes, and that differences in the headgroup chemistry manifest only in probability distributions of conformations. Furthermore, the analysis of 894 protein-bound lipid structures from the Protein Data Bank suggests that lipids can bind to proteins in a wide range of conformations, which are not limited by the headgroup chemistry. We propose that lipids can select a suitable headgroup conformation from the wide range available to them to fit the various binding sites in proteins. The proposed inverse conformational selection model will extend also to lipid binding to targets other than proteins, such as drugs, RNA, and viruses.

Published
2021

2. Efficient virtual screening using multiple protein conformations described as negative images of the ligand-binding site

Author

Olli T. Pentikäinen and Salla I. Virtanen

Subjects
Models, Molecular, Virtual screening, Binding Sites, Chemistry, Protein Conformation, General Chemical Engineering, Drug Evaluation, Preclinical, Proteins, Hydrogen Bonding, General Chemistry, Computational biology, Library and Information Sciences, Ligands, Computer Science Applications, User-Computer Interface, Protein structure, Biochemistry, ROC Curve, Docking (molecular), Computer Graphics, Binding site, Databases, Protein, Software, Protein Binding
Abstract

The protein structure-based virtual screening is typically accomplished using a molecular docking procedure. However, docking is a fairly slow process that is limited by the available scoring functions that cannot reliably distinguish between active and inactive ligands. In contrast, the ligand-based screening methods that are based on shape similarity identify the active ligands with high accuracy. Here, we show that the usage of negative images of the ligand-binding site, together with shape comparison tools, which are typically used in ligand-based virtual screening, improve the discrimination of active molecules from inactives. In contrast to ligand-based shape comparison, the negative image of the binding site allows identification of compounds whose shape complements the shape of the ligand-binding cavity as closely as possible. Furthermore, the use of several target protein conformations allows the identification of active ligands whose shape is not optimal for crystallized protein conformation. Accordingly, the presented virtual screening method improves the identification of novel lead molecules by concentrating on the optimally shaped molecules for the flexible ligand binding site.

Published
2010

3. Sphingomyelin induces structural alteration in canine parvovirus capsid

Author

Jenni Karttunen, Kirsi I. Pakkanen, Matti Vuento, and Salla I. Virtanen

Subjects
Cancer Research, Circular dichroism, Parvovirus, Canine, Endosome, animal diseases, viruses, Phosphatidylserines, Capsid, Dogs, Virology, Animals, chemistry.chemical_classification, Phospholipase A, biology, Vesicle, technology, industry, and agriculture, Canine parvovirus, biology.organism_classification, Sphingomyelins, Phospholipases A2, Infectious Diseases, Enzyme, chemistry, Biochemistry, lipids (amino acids, peptides, and proteins), Capsid Proteins, Sphingomyelin
Abstract

One of the essential steps in canine parvovirus (CPV) infection, the release from endosomal vesicles, is dominated by interactions between the virus capsid and the endosomal membranes. In this study, the effect of sphingomyelin and phosphatidyl serine on canine parvovirus capsid and on the phospholipase A(2) (PLA(2)) activity of CPV VP1 unique N-terminus was analyzed. Accordingly, a significant (P< or =0.05) shift of tryptophan fluorescence emission peak was detected at pH 5.5 in the presence of sphingomyelin, whereas at pH 7.4 a similar but minor shift was observed. This effect may relate to the exposure of VP1 N-terminus in acidic pH as well as to interactions between sphingomyelin and CPV. When the phenomenon was further characterized using circular dichroism spectroscopy, differences in CPV capsid CD spectra with and without sphingomyelin and phosphatidyl serine were detected, corresponding to data obtained with tryptophan fluorescence. However, when the enzymatic activity of CPV PLA(2) was tested in the presence of sphingomyelin, no significant effect in the function of the enzyme was detected. Thus, the structural changes observed with spectroscopic techniques appear not to manipulate the activity of CPV PLA(2), and may therefore implicate alternative interactions between CPV capsid and sphingomyelin.

Published
2007

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