Myosin Binding Protein-C Forms Amyloid-Like Aggregates In Vitro

• Published in: International journal of molecular sciences 2021-01, Vol.22 (2), p.731
• Main Authors: Bobyleva, Liya G, Shumeyko, Sergey A, Yakupova, Elmira I, Surin, Alexey K, Galzitskaya, Oxana V, Kihara, Hiroshi, Timchenko, Alexander A, Timchenko, Maria A, Penkov, Nikita V, Nikulin, Alexey D, Suvorina, Mariya Yu, Molochkov, Nikolay V, Lobanov, Mikhail Yu, Fadeev, Roman S, Vikhlyantsev, Ivan M, Bobylev, Alexander G
• Format: Article
• Language: English
• Subjects: Aggregates; Amino Acid Sequence; Amyloid - chemistry; Amyloid - metabolism; Amyloid - ultrastructure; Atomic force microscopy; Biocompatibility; Carrier Proteins - chemistry; Carrier Proteins - metabolism; Cell culture; Chromatography, High Pressure Liquid; Circular Dichroism; Dichroism; Dynamic Light Scattering; Filaments; Immunoglobulins; In Vitro Techniques; Kinases; Kinetics; Light scattering; Mass Spectrometry; Microscopy; Models, Molecular; Molecular weight; Musculoskeletal system; Myosin; Photon correlation spectroscopy; Protein Aggregates; Protein Aggregation, Pathological; Protein Conformation; Protein structure; Proteins; Quaternary structure; Secondary structure; Small angle X ray scattering; Structure-Activity Relationship; Toxicity; Transmission electron microscopy; X-Ray Diffraction; X-ray scattering
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms22020731

This work investigated in vitro aggregation and amyloid properties of skeletal myosin binding protein-C (sMyBP-C) interacting in vivo with proteins of thick and thin filaments in the sarcomeric A-disc. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) found a rapid (5-10 min) formation of large (>2 μm) aggregates. sMyBP-C oligomers formed both at the initial 5-10 min and after 16 h of aggregation. Small angle X-ray scattering (SAXS) and DLS revealed sMyBP-C oligomers to consist of 7-10 monomers. TEM and atomic force microscopy (AFM) showed sMyBP-C to form amorphous aggregates (and, to a lesser degree, fibrillar structures) exhibiting no toxicity on cell culture. X-ray diffraction of sMyBP-C aggregates registered reflections attributed to a cross-β quaternary structure. Circular dichroism (CD) showed the formation of the amyloid-like structure to occur without changes in the sMyBP-C secondary structure. The obtained results indicating a high in vitro aggregability of sMyBP-C are, apparently, a consequence of structural features of the domain organization of proteins of this family. Formation of pathological amyloid or amyloid-like sMyBP-C aggregates in vivo is little probable due to amino-acid sequence low identity (