Siderophore Rearranging Itself for New pH (IMAGE) Washington University in St. Louis Caption As the pH of its surroundings rises, the siderophore pre-actinobactin (top) rearranges itself structurally to form the molecule actinobactin (bottom) that functions better at the new pH. Two copies of the molecules join to grasp an iron atom. Credit Tim Wencewicz Usage Restrictions Please credit 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.