Biosynthesis of Taxadien (image) Technical University of Munich (TUM) Share Print E-Mail 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 Share Print E-Mail 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.