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Transition kinetics of the conversion of blue to purple bacteriorhodopsin upon magnesium binding
Institution:Max-Planck-Institut für Ernährungsphysiologie, D-4600 Dortmund, FRG
Abstract:Magnesium binding to cation-depleted blue bacteriorhodopsin (b-bR) was studied spectrophotometrically as well as by following stopped-flow kinetics. There exist three kinetically different steps in the binding process, yielding purple bacteriorhodopsin (p-bR). Since only the firtst step is dependent on the concentration of the reactants, the reaction scheme
></figure> can be proposed as the simplest model, with MgbR being the first intermediate and ΣI denoting a set of successive intermediates. According to this model <em>k</em><sub>1</sub>, <em>k</em><sub>−1</sub> and <em>k</em><sub>2</sub> are calculated to be 2.8 × 10<sup>4</sup> M<sup>−1</sup> · s<sup>−1</sup>, 5.0 × 10 s<sup>−1</sup> and 1 × 10<sup>−2</sup> s<sup>−1</sup>, respectively.</td>
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