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Updated: May 5, 2026

Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
Published on: October 9, 2021
The frequency-domain method reveals the dimeric structure of Na,K-ATPase
E Amler1, R Staffolani, A Kotyk
1Institute of Physiology, Czech Academy of Sciences, Vídeňská 1083, 142 20, Prague 4, Czech Republic.
Abstract:
Lucifer yellow and lissamine rhodamine sulfonyl hydrazine were used as the donor and the receptor, respectively, for Förster energy transfer measurements to determine the location of the β subunit in the native Na,K-ATPase from pig kidney. It was found that (1) the β subunits are located in one functional complex, i.e., the dimer (αβ)2 appears to be the functional complex of Na,K-ATPase, and (2) the β subunits in the functional enzyme complex in the membrane are not located next to each other but are rather well separated. The distance between fluorophores covalently attached to the β subunits was found to be 5.3 nm.
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