NMR paper in Nature Structural & Molecular Biology
L.A. Freiburger, O.M. Baettig, T. Sprules, A.M. Berghuis, K. Auclair, A.K. Mittermaier, "Competing allosteric mechanisms modulate substrate binding in a dimeric enzyme," Nature Structural & Molecular Biology (2011) online. http://dx.doi.org/10.1038/nsmb.1978