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Tolmacheva AS, Blinova EA, Ermakov EA, Buneva VN, Vasilenko NL, Nevinsky GA. IgG abzymes with peroxidase and oxidoreductase activities from the sera of healthy humans. J Mol Recognit 2015; 28:565-80. [PMID: 25946706 DOI: 10.1002/jmr.2474] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 02/15/2015] [Indexed: 11/07/2022]
Abstract
We present the evidence showing that small fractions of electrophoretically homogeneous immunoglobulin G (IgGs) from the sera of healthy humans and their Fab and F(ab)2 fragments oxidize 3,3'-diaminobenzidine through a peroxidase activity in the presence of H2 O2 and through an oxidoreductase activity in the absence of H2 O2 . During purification on protein G-Sepharose and gel filtration, the polyclonal IgGs partially lose the Me(2+) ions. After extensive dialysis of purified Abs against agents chelating metal ions, the relative peroxidase activity decreased dependently of IgG analyzed from 100 to ~10-85%, while oxidoreductase activity from 100 to 14-83%. Addition of external metal ions to dialyzed and non-dialyzed IgGs leads to a significant increase in their activity. Chromatography of the IgGs on Chelex non-charged with Cu(2+) ions results in the adsorption of a small IgG fraction bound with metal ions (~5%), while Chelex charged with Cu(2+) ions bind additionally ~38% of the total IgGs. Separation of Abs on both sorbents results in IgG separation to many different subfractions demonstrating various affinities to the chelating resin and different levels of the specific oxidoreductase and peroxidase activities. In the presence of external Cu(2+) ions, the specific peroxidase activity of several IgG subfractions achieves 20-27 % as compared with horseradish peroxidase (HRP, taken for 100%). The oxidoreductase activity of these fractions is ~4-6-fold higher than that for HRP. Antioxidant enzymes such as superoxide dismutases, catalases, and glutathione peroxidases are known to represent critical defence mechanisms for preventing oxidative modifications of DNA, proteins, and lipids. Peroxidase and oxidoreductase activities of human IgGs could also play an important role in the protection of organisms from oxidative stress and toxic compounds.
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Affiliation(s)
- Anna S Tolmacheva
- Siberian Division of Russian Academy of Sciences, Institute of Cytology and Genetics, Lavrentiev Ave., 10, Novosibirsk, Russia
| | - Elena A Blinova
- Siberian Division of Russian Academy of Sciences, Institute of Chemical Biology and Fundamental Medicine, Lavrentiev Ave., 8, Novosibirsk, 630090, Russia
| | - Evgeny A Ermakov
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
| | - Valentina N Buneva
- Siberian Division of Russian Academy of Sciences, Institute of Chemical Biology and Fundamental Medicine, Lavrentiev Ave., 8, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
| | - Nataliya L Vasilenko
- Siberian Division of Russian Academy of Sciences, Institute of Cytology and Genetics, Lavrentiev Ave., 10, Novosibirsk, Russia
| | - Georgy A Nevinsky
- Siberian Division of Russian Academy of Sciences, Institute of Chemical Biology and Fundamental Medicine, Lavrentiev Ave., 8, Novosibirsk, 630090, Russia.,Novosibirsk State University, 2 Pirogova St., Novosibirsk, 630090, Russia
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Zvereva VV, Trunova VA. Determination of the elemental composition of tissues of the cardiovascular system by atomic spectrometry, mass spectrometry and X-ray spectrometry methods. JOURNAL OF ANALYTICAL CHEMISTRY 2012. [DOI: 10.1134/s1061934812070064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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