Dynamical properties of the loop 320s of substrate-free and substrate-bound muscle creatine kinase by NMR: evidence for independent subunits.

Gwladys Rivière, Maggy Hologne, Olivier Marcillat, Jean-Marc Lancelin

Institut des Sciences Analytiques, Université de Lyon, Université Claude Bernard Lyon 1, Villeurbanne, France.

The FEBS journal 2012 Aug

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Muscle creatine kinase (MCK; EC2.7.3.2) is a 86 kDa homodimer that belongs to the family of guanidino kinases. MCK has been intensively studied for several decades, but it is still not known why it is a dimer because this quaternary structure does not translate into obvious structural or functional advantages over the homologous monomeric arginine kinase. In particular, it remains to be demonstrated whether MCK subunits are independent. Here, we describe NMR chemical-shift perturbation and relaxation experiments designed to study the active site 320s flexible loop of this enzyme. The analysis was performed with the enzyme in its ligand-free and MgADP-complexed forms, as well as with the transition-state analogue abortive complex (MCK-Mg-ADP-creatine-nitrate ion). Our data indicate that each subunit can bind substrates independently. © 2012 The Authors Journal compilation © 2012 FEBS.

Citation

Gwladys Rivière, Maggy Hologne, Olivier Marcillat, Jean-Marc Lancelin. Dynamical properties of the loop 320s of substrate-free and substrate-bound muscle creatine kinase by NMR: evidence for independent subunits. The FEBS journal. 2012 Aug;279(16):2863-75