title: Amylolytic activity of IgM and IgG antibodies from patients with multiple sclerosis.
abstract: IgG and IgM antibodies from the sera of patients with multiple sclerosis (MS) were found to possess amylolytic activity hydrolyzing alpha-(1-->4)-glucosyl linkages of maltooligosaccharides, glycogen, and several artificial substrates. Individual IgM fractions isolated from 54 analyzed patients with the clinically definite diagnoses of MS had approximately three orders of magnitude higher specific amylolytic activity than that for healthy donors, whereas IgG from only a few patients had high amylolytic activity. Strict criteria were used to prove that the amylolytic activity of IgMs and IgGs is their intrinsic property and is not due to any enzyme contamination. Fab fragments produced from IgM and IgG fractions of the MS patients displayed the same amylolytic activity. IgMs from various patients demonstrated different modes of action in hydrolyzing maltooligosaccharides.
authors.affiliation: Biophysics Department, St Petersburg Technical University, St Petersburg, Russia.
authors.forename: Andrew N
authors.initials: AN
authors.lastname: Saveliev
authors.forename: Dina R
authors.initials: DR
authors.lastname: Ivanen
authors.forename: Anna A
authors.initials: AA
authors.lastname: Kulminskaya
authors.forename: Nadezhda A
authors.initials: NA
authors.lastname: Ershova
authors.forename: Tat'yana G
authors.initials: TG
authors.lastname: Kanyshkova
authors.forename: Valentina N
authors.initials: VN
authors.lastname: Buneva
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Mogelnitskii
authors.forename: Boris M
authors.initials: BM
authors.lastname: Doronin
authors.forename: Olga O
authors.initials: OO
authors.lastname: Favorova
authors.forename: Georgy A
authors.initials: GA
authors.lastname: Nevinsky
authors.forename: Kirill N
authors.initials: KN
authors.lastname: Neustroev
mesh_terms: D000328:Adult; D000681:Amylases / Q000378:metabolism; D017151:Antibodies, Catalytic / Q000097:blood / Q000737:chemistry / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D006868:Hydrolysis; D007074:Immunoglobulin G / Q000097:blood / Q000737:chemistry / Q000378:metabolism*; D007075:Immunoglobulin M / Q000097:blood / Q000737:chemistry / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000097:blood / Q000201:enzymology* / Q000276:immunology*; D009844:Oligosaccharides / Q000378:metabolism
chemical_list: D017151:Antibodies, Catalytic; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D009844:Oligosaccharides; C021705:maltooligosaccharides; D000681:Amylases