Hemoglobin, though not an enzyme, is the canonical example of an allosteric protein molecule - and one of the earliest to have its crystal structure solved (by Max Perutz).
Max Roach | Max Martin | Mad Max | Max Ernst | Max Bygraves | Max Weber | Max Bruch | Max McLean | Max | Max Factor | Max Beckmann | Max Baucus | Max von Sydow | Max Reger | Max Beerbohm | Max Ophüls | Max Müller | Max Headroom | Max Bill | Peter Max | Max Reinhardt | Max Planck Society | Max Azria | Max Payne | Max Mosley | Max Mirnyi | Max Mallowan | Max Liebermann | Max Eastman | Max Born |