Adenylate kinase (EC 2.7.4.3) (also known as ADK or myokinase) is a phosphotransferase enzyme that catalyzes the interconversion of adenine nucleotides, and plays an important role in cellular energy homeostasis.http://www.creative-enzymes.com/product/Native-Bacillus-Stearothermophilus-Myokinase_1306.html