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Flexibility of Na,K-ATPase secondary structure upon drug-protein interaction

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Abstract

The enzyme Na+, K+-ATPase is an integral membrane protein which transports sodium and potassium cations against an electrochemical gradient. The transport of Na+ and K+ ions is connected to an oscillation of the enzyme between the two conformational states, the E1 (Na+) and the E2 (K+) conformations. The enzymatic activity of ATPase is largley affected by different ligands complexation. This review reports the effects of several drugs such as AZT (anti-AIDS), cis-Pt (antitumor), aspirin (anti-inflammatory) and vitamin C (antioxidant) on the stability and secondary structure of Na,K-ATPase in vitro. Drug-enzyme binding is mainly through H-bonding to the polypeptide C=O and C-N groups with two binding constants K1(AZT) = 5.30 × 105 M−1 and K2(AZT) = 9.80 × 103 M−1 for AZT and one binding constant for Kcis-Pt = 1.93 × 104 M−1, Kaspirin = 6.45 × 103 M−1 and Kascorbate = 1.04 × 104 M−1 for cis-Pt, aspirin and ascorbic acid. The enzyme secondary structure was altered from that of α-helix 19.8% (free protein) to almost 22–26% and the β-sheet from 25.6% to 18–22%, upon drug complexation with the order of induced stability AZT > cis-Pt > ascorbate > aspirin.

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  1. Department of Chemistry-Biology, University of Québec at Trois-Rivières, C.P. 500, TR (Québec), Canada, G9A 5H7

    H. A. Tajmir-Riahi

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  1. H. A. Tajmir-Riahi
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Tajmir-Riahi, H.A. Flexibility of Na,K-ATPase secondary structure upon drug-protein interaction. JICS 4, 256–263 (2007). https://doi.org/10.1007/BF03245974

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