[DNA-dependent ATPase] Dda (short for DNA-dependent ATPase; also known as Dda helicase and Dda DNA helicase) is the 439-amino acid 49,897-atomic mass unit protein coded by the Dda gene of the bacteriophage T4 phage, a virus that infects enterobacteria. == Biochemistry == Dda is a molecular motor, specifically a helicase that moves in the 5`... Found on http://en.wikipedia.org/wiki/Dda_(DNA-dependent_ATPase)