Blar i Faculty of Medicine på forfatter "Raasakka, Arne"
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Antagonistic Functions of MBP and CNP Establish Cytosolic Channels in CNS Myelin
Snaidero, Nicolas; Velte, Caroline; Myllykoski, Matti; Raasakka, Arne; Ignatev, Alexander; Werner, Hauke B.; Erwig, Michelle S.; Möbius, Wiebke; Kursula, Petri; Nave, Klaus-Armin; Simons, Mikael (Peer reviewed; Journal article, 2017-01)The myelin sheath is a multilamellar plasma membrane extension of highly specialized glial cells laid down in regularly spaced segments along axons. Recent studies indicate that myelin is metabolically active and capable ... -
The Characterization of Disordered Membrane-Binding Proteins of Myelin. A Biophysical Approach
Raasakka, Arne (Doctoral thesis, 2019-04-12)Myelin is a multilayered lipid-rich structure that surrounds selected axonal segments in the central and peripheral nervous systems (CNS and PNS, respectively). Myelin insulates axons, which increases nerve conduction ... -
Cryo-EM, X-ray diffraction, and atomistic simulations reveal determinants for the formation of a supramolecular myelin-like proteolipid lattice
Ruskamo, Salla; Krokengen, Oda Caspara; Kowal, Julia; Nieminen, Tuomo; Lehtimäki, Mari; Raasakka, Arne; Dandey, Venkata P; Vattulainen, Ilpo; Stahlberg, Henning; Kursula, Petri (Journal article; Peer reviewed, 2020)Myelin protein P2 is a peripheral membrane protein of the fatty acid–binding protein family that functions in the formation and maintenance of the peripheral nerve myelin sheath. Several P2 gene mutations cause human ... -
Determinants of ligand binding and catalytic activity in the myelin enzyme 2′,3′-cyclic nucleotide 3′-phosphodiesterase
Raasakka, Arne; Myllykoski, Matti; Laulumaa, Saara; Lehtimäki, Mari; Härtlein, Michael; Moulin, Martine; Kursula, Inari; Kursula, Petri (Peer reviewed; Journal article, 2015-11-13)2′,3′-cyclic nucleotide 3′-phosphodiesterase (CNPase) is an enzyme highly abundant in the central nervous system myelin of terrestrial vertebrates. The catalytic domain of CNPase belongs to the 2H phosphoesterase superfamily ... -
Direct Binding of the Flexible C-Terminal Segment of Periaxin to β4 Integrin Suggests a Molecular Basis for CMT4F
Raasakka, Arne; Linxweiler, Helen; Brophy, Peter J; Sherman, Diane L; Kursula, Petri (Peer reviewed; Journal article, 2019-04-09)The process of myelination in the nervous system requires a coordinated formation of both transient and stable supramolecular complexes. Myelin-specific proteins play key roles in these assemblies, which may link membranes ... -
Flexible Players within the Sheaths: The Intrinsically Disordered Proteins of Myelin in Health and Disease
Raasakka, Arne; Kursula, Petri (Journal article; Peer reviewed, 2020)Myelin ensheathes selected axonal segments within the nervous system, resulting primarily in nerve impulse acceleration, as well as mechanical and trophic support for neurons. In the central and peripheral nervous systems, ... -
High-affinity anti-Arc nanobodies provide tools for structural and functional studies
Markusson, Sigurbjörn; Hallin, Erik Ingmar; Bustad, Helene J.; Raasakka, Arne; Xu, Ju; Muruganandam, Gopinath; Loris, Remy; Martinez, Aurora; Bramham, Clive Raymond Evjen; Kursula, Petri (Journal article; Peer reviewed, 2022)Activity-regulated cytoskeleton-associated protein (Arc) is a multidomain protein of retroviral origin with a vital role in the regulation of synaptic plasticity and memory formation in mammals. However, the mechanistic ... -
How Does Protein Zero Assemble Compact Myelin?
Raasakka, Arne; Kursula, Petri (Journal article; Peer reviewed, 2020-08)Myelin protein zero (P0), a type I transmembrane protein, is the most abundant protein in peripheral nervous system (PNS) myelin—the lipid-rich, periodic structure of membrane pairs that concentrically encloses long axonal ... -
Human myelin proteolipid protein structure and lipid bilayer stacking
Ruskamo, Salla; Raasakka, Arne; Pedersen, Jan Skov; Martel, Anne; Škubník, Karel; Darwish, Tamim; Porcar, Lionel; Kursula, Petri (Journal article; Peer reviewed, 2022)The myelin sheath is an essential, multilayered membrane structure that insulates axons, enabling the rapid transmission of nerve impulses. The tetraspan myelin proteolipid protein (PLP) is the most abundant protein of ... -
The intrinsically disordered protein glue of the myelin major dense line: Linking AlphaFold2 predictions to experimental data
Krokengen, Oda Caspara; Raasakka, Arne; Kursula, Petri Tapani (Journal article; Peer reviewed, 2023)Numerous human proteins are classified as intrinsically disordered proteins (IDPs). Due to their physicochemical properties, high-resolution structural information about IDPs is generally lacking. On the other hand, IDPs ... -
Ionic strength and calcium regulate membrane interactions of myelin basic protein and the cytoplasmic domain of myelin protein zero
Raasakka, Arne; Jones, Nykola C; Hoffmann, Søren V; Kursula, Petri (Peer reviewed; Journal article, 2019)The formation of a mature myelin sheath in the vertebrate nervous system requires specific protein-membrane interactions. Several myelin-specific proteins are involved in stacking lipid membranes into multilayered structures ... -
Membrane Association Landscape of Myelin Basic Protein Portrays Formation of the Myelin Major Dense Line
Raasakka, Arne; Ruskamo, Salla; Kowal, Julia; Barker, Robert; Baumann, Anne; Martel, Anne; Tuusa, Jussi; Myllykoski, Matti; Bürck, Jochen; Ulrich, Anne S.; Stahlberg, Henning; Kursula, Petri (Peer reviewed; Journal article, 2017-07-10)Compact myelin comprises most of the dry weight of myelin, and its insulative nature is the basis for saltatory conduction of nerve impulses. The major dense line (MDL) is a 3-nm compartment between two cytoplasmic leaflets ... -
Molecular structure and function of myelin protein P0 in membrane stacking
Raasakka, Arne; Ruskamo, Salla; Kowal, Julia; Han, Huijong; Baumann, Anne; Myllykoski, Matti; Fasano, Anna; Rossano, Rocco; Riccio, Paolo; Bürck, Jochen; Ulrich, Anne S.; Stahlberg, Henning; Kursula, Petri (Peer reviewed; Journal article, 2019)Compact myelin forms the basis of nerve insulation essential for higher vertebrates. Dozens of myelin membrane bilayers undergo tight stacking, and in the peripheral nervous system, this is partially enabled by myelin ... -
Myelin-derived and putative molecular mimic peptides share structural properties in aqueous and membrane-like environments
Tuusa, Jussi; Raasakka, Arne; Ruskamo, Salla; Kursula, Petri (Peer reviewed; Journal article, 2017-03-24)Background: Despite intense research, the causes of various neurological diseases remain enigmatic to date. A role for viral or bacterial infection and associated molecular mimicry has frequently been suggested in the ... -
Neuropathy-related mutations alter the membrane binding properties of the human myelin protein P0 cytoplasmic tail
Raasakka, Arne; Ruskamo, Salla; Barker, Robert; Krokengen, Oda Caspara; Vatne, Guro Helén; Kristiansen, Cecilie Katrin; Hallin, Erik Ingmar; Skoda, Maximilian W. A.; Bergmann, Ulrich; Wacklin-Knecht, Hanna; Jones, Nykola C; Hoffmann, Søren V; Kursula, Petri (Peer reviewed; Journal article, 2019-06-07)Schwann cells myelinate selected axons in the peripheral nervous system (PNS) and contribute to fast saltatory conduction via the formation of compact myelin, in which water is excluded from between tightly adhered lipid ... -
Stability and flexibility of full-length human oligodendrocytic QKI6
Raasakka, Arne; Kursula, Petri (Peer reviewed; Journal article, 2019-09-23)Objective: Oligodendrocytes account for myelination in the central nervous system. During myelin compaction, key proteins are translated in the vicinity of the myelin membrane, requiring targeted mRNA transport. Quaking ... -
Structural and biophysical characterization of transcription factor HNF-1A as a tool to study MODY3 diabetes variants
Kind, Laura; Raasakka, Arne; Molnes, Janne; Aukrust, Ingvild; Bjørkhaug, Lise; Njølstad, Pål Rasmus; Kursula, Petri; Arnesen, Thomas (Journal article; Peer reviewed, 2022)Hepatocyte nuclear factor 1A (HNF-1A) is a transcription factor expressed in several embryonic and adult tissues, modulating the expression of numerous target genes. Pathogenic variants in the HNF1A gene are known to cause ... -
Structural insights into Charcot–Marie–Tooth disease-linked mutations in human GDAP1
Sutinen, Aleksi; Nguyen, Giang Thi Tuyet; Raasakka, Arne; Muruganandam, Gopinath; Loris, Remy; Ylikallio, Emil; Tyynismaa, Henna; Bartesaghi, Luca; Ruskamo, Salla; Kursula, Petri (Journal article; Peer reviewed, 2022)Charcot–Marie–Tooth disease (CMT) is the most common inherited peripheral polyneuropathy in humans, and its different subtypes are linked to mutations in dozens of different genes. Mutations in ganglioside-induced ... -
Structural properties of the HNF-1A transactivation domain
Kind, Laura; Driver, Mark; Raasakka, Arne; Onck, Patrick R.; Njølstad, Pål Rasmus; Arnesen, Thomas; Kursula, Petri Tapani (Journal article; Peer reviewed, 2023)Hepatocyte nuclear factor 1α (HNF-1A) is a transcription factor with important gene regulatory roles in pancreatic β-cells. HNF1A gene variants are associated with a monogenic form of diabetes (HNF1A-MODY) or an increased ... -
Structural similarities and functional differences clarify evolutionary relationships between tRNA healing enzymes and the myelin enzyme CNPase
Muruganandam, Gopinath; Raasakka, Arne; Myllykoski, Matti; Kursula, Inari; Kursula, Petri (Peer reviewed; Journal article, 2017-05-16)Background: Eukaryotic tRNA splicing is an essential process in the transformation of a primary tRNA transcript into a mature functional tRNA molecule. 5′-phosphate ligation involves two steps: a healing reaction catalyzed ...