Biosynthesis of Taxadien (IMAGE) Technical University of Munich (TUM) Caption Taxadien synthase with the substrate geranylgeranyldiphosphat in the active center of the enzyme. The green dots mark the catalytically relevant Mg2+-ions, which are involved in the initial hydrolysis of the phosphate residue. Credit Max Hirte / TUM Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.