Allosteric effect of ATP on Na+,K+-ATPase conformational kinetics

Cite This

Files in this item

Checksum: MD5:3263e04f7a92d89c1d4b2409795d0389

CLARKE, Ronald J., Hans-Jürgen APELL, Benjamin Y. KONG, 2007. Allosteric effect of ATP on Na+,K+-ATPase conformational kinetics. In: Biochemistry. 46(23), pp. 7034-7044. ISSN 0006-2960. eISSN 1520-4995. Available under: doi: 10.1021/bi700619s

@article{Clarke2007Allos-8354, title={Allosteric effect of ATP on Na+,K+-ATPase conformational kinetics}, year={2007}, doi={10.1021/bi700619s}, number={23}, volume={46}, issn={0006-2960}, journal={Biochemistry}, pages={7034--7044}, author={Clarke, Ronald J. and Apell, Hans-Jürgen and Kong, Benjamin Y.} }

2011-03-24T17:42:54Z Apell, Hans-Jürgen Clarke, Ronald J. 2007 Allosteric effect of ATP on Na+,K+-ATPase conformational kinetics terms-of-use Clarke, Ronald J. First publ. in: Biochemistry 46 (2007), pp. 7034-7044 The kinetics of the E2 -> E1 conformational change of unphosphorylated Na+,K+-ATPase was investigated via the stopped-flow technique using the fluorescent label RH421 (pH 7.4, 24 C). The enzyme was pre-equilibrated in a solution containing 25 mM histidine and 0.1 mM EDTA to stabilize the E2 conformation. When rabbit enzyme was mixed with 130 mM NaCl alone or with 130 mM NaCl and varying concentrations of Na2ATP simultaneously, a fluorescence decrease was observed. In the absence of ATP, the fluorescence decrease followed a biexponential time course, but at ATP concentrations after mixing of 50 M, the fluorescence transient could be adequately fitted by a single exponential. On the basis of the agreement between theoretical simulations and experimental traces, we propose that in the absence of bound ATP the conformational transition occurs as a two step reversible process within a protein dimer, E2:E2 -> E2:E1 -> E1:E1. In the presence of 130 mM NaCl, the sum of the forward and backward rate constants for the E2:E2 -> E2:E1 and E2:E1 -> E1:E1 transitions were found to be 10.4 (±1.0) and 0.49 (±0.02) s-1, respectively. At saturating concentrations of ATP, however, the transition occurs in a single reversible step with the sum of its forward and backward rate constants equal to 35.2 (±0.3) s-1. It was found that ATP acting at a high affinity site (Kd 0.25 M), stimulated the reverse reaction, E1ATP -> E2ATP, in addition to its known allosteric low affinity (Kd 71 M) stimulation of the forward reaction, E2ATP -> E1ATP. application/pdf Kong, Benjamin Y. eng Apell, Hans-Jürgen Kong, Benjamin Y.

Downloads since Oct 1, 2014 (Information about access statistics)

Allosteric_effect_of_ATP_on.pdf 231

This item appears in the following Collection(s)

terms-of-use Except where otherwise noted, this item's license is described as terms-of-use

Search KOPS


My Account