2017  0,977
2016  0,799
2015  0,662
2014  0,740
2013  0,739
2012  0,637
2011  0,658
2010  0,654
2009  0,570
2008  0,849
2007  0,805
2006  0,330
2005  0,435
2004  0,623
2003  0,567
2002  0,641
2001  0,490
2000  0,477
1999  0,762
1998  0,785
1997  0,507
1996  0,518
1995  0,502
Vol 52(2018) N 1 p. 42-51; DOI 10.1134/S0026893318010089 Full Text

N.S. Katina, E.I. Grigorashvili, M.Yu. Suvorina, N.B. Ilyina, N.A. Ryabova, O.M. Selivanova, A.K. Surin*

Amyloid Core Wild-Type Apomyoglobin and Its Mutant Variants Is Formed by Different Regions of the Polypeptide Chain

Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290 Russia

Received - 2017-06-05; Accepted - 2017-07-14

As has been recently shown, the toxicity of protein aggregates is determined by their structure. Therefore, special attention has been focused on the search for factors that specify the structural features of formed amyloid fibrils. The effect of amino acid substitutions in apomyoglobin on the structural characteristics of its amyloid aggregates has been analyzed. The morphology and secondary structure of amyloids of the wild-type protein and its mutant variants Val10Ala, Val10Phe, and Trp14Phe have been compared, and the regions involved in intermolecular interactions in fibrils have been determined using limited proteolysis and mass spectrometry. No considerable differences have been found in the morphology (shape, length, or diameter) or the content (percentage) of the cross-β structure of apomyoglobin amyloids and its mutant variants. Amyloid cores of wild-type apomyoglobin and variants with Val10Phe and Trp14Phe substitutions have been formed by different regions of the polypeptide chain. The case study of apomyoglobin demonstrates that the location of amyloidogenic regions in the polypeptide chain of wild-type protein and its mutant forms can differ. Thus, possible structural changes in amyloids resulting from amino acid substitutions should be taken into account when studying phenotype aggregation.

amyloids, apomyoglobin, limited proteolysis, polymorphism of amyloids, mass spectrometry