TY - JOUR

T1 - Sup35NMp Morphology Evaluation on Au, Si, Formvar and Mica Surfaces Using AFM, SEM and TEM

AU - Sokolov, P. A.

AU - Bondarev, S. A.

AU - Belousov, M. V.

AU - Zhouravleva, G. A.

AU - Kasyanenko, N.A.

PY - 2018/1

Y1 - 2018/1

N2 - Prion and some other incurable human neurodegenerative diseases are associated with misfolding of specific proteins, followed by the formation of amyloids. Despite the widespread usage of the transmission electron and of the atomic force microscopy for studing such amyloids, many related methodological issues still have not been studied until now. Here, we consider one of the first amyloids found in Saccharomyces cerevisiae yeast, i.e. Sup35NMp, to study the adsorption of monomeric protein and its fibrils on the surface of mica, silica, gold and on formvar film. Comparison of linear characteristics of these units calculated by processing of images obtained by the atomic force, transmission and scanning electron microscopy was carried out. The minimal number of measurements of fibril diameters to obtain the values in a given confidence interval were determined. We investigated the film formed by monomeric protein on mica surface, which veiled some morphology features of fibrils. Besides, we revealed that parts of the Sup35NMp excluded from the fibril core can form a wide “coat”. The length of the protein forming the core of the fibrils was estimated.

AB - Prion and some other incurable human neurodegenerative diseases are associated with misfolding of specific proteins, followed by the formation of amyloids. Despite the widespread usage of the transmission electron and of the atomic force microscopy for studing such amyloids, many related methodological issues still have not been studied until now. Here, we consider one of the first amyloids found in Saccharomyces cerevisiae yeast, i.e. Sup35NMp, to study the adsorption of monomeric protein and its fibrils on the surface of mica, silica, gold and on formvar film. Comparison of linear characteristics of these units calculated by processing of images obtained by the atomic force, transmission and scanning electron microscopy was carried out. The minimal number of measurements of fibril diameters to obtain the values in a given confidence interval were determined. We investigated the film formed by monomeric protein on mica surface, which veiled some morphology features of fibrils. Besides, we revealed that parts of the Sup35NMp excluded from the fibril core can form a wide “coat”. The length of the protein forming the core of the fibrils was estimated.

KW - Amyloid

KW - Fibril

KW - Microscopy

KW - Prion

KW - Structure

KW - Yeasts

KW - AMYLOID FIBERS

KW - DOMAIN

KW - DETERMINANT

KW - YEAST SUP35

KW - SACCHAROMYCES-CEREVISIAE

KW - SYNUCLEIN STRAINS

KW - ATOMIC-FORCE MICROSCOPY

KW - PRION VARIANTS

KW - BETA-SHEET STRUCTURE

KW - DIVERSITY

UR - http://www.scopus.com/inward/record.url?scp=85032590565&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/sup35nmp-morphology-evaluation-au-si-formvar-mica-surfaces-using-afm-sem-tem

U2 - 10.1016/j.jsb.2017.10.006

DO - 10.1016/j.jsb.2017.10.006

M3 - Article

VL - 201

SP - 5

EP - 14

JO - Journal of Structural Biology

JF - Journal of Structural Biology

SN - 1047-8477

IS - 1

ER -