RHYS LEWIS, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Hydrogen peroxide enzymatic decomposition. Animation of the human catalase enzyme speeding up the decomposition of the inorganic chemical hydrogen peroxide. The animation starts with a molecular protein model of the enzyme, with the heme groups highlighted. These groups contain Fe2+ iron ions (labelled). A molecule of hydrogen peroxide (H2O2) binds to the heme group. Hydrogen peroxide consists of two atoms of oxygen (red) and two atoms of hydrogen (white). The animation shows bonds breaking and forming with the iron. For each hydrogen peroxide molecule, one water molecule forms. The removed oxygen is left forming an iron-oxygen complex, which breaks up to form an oxygen molecule (O2), leaving the enzyme unchanged. The catalase is not used up, and acts as a catalyst and increases the reaction rate which is slow at room temperature. For the animation without labels, see clip K005/4861.
Model release not required. Property release not required.