Caught in the act: 3D structure of an RNA-modifying protein determined in action

RNA-modifying protein
Structure of the RNA-modifying protein RlmN, shown in a ribbon-diagram. The RlmN (blue ribbon) is trapped in the middle of its reaction while it is bound to transfer RNA (shown in grey, stick format). Iron and sulfur atoms are shown as orange and yellow spheres. Selected amino acids, cofactors, and nucleobases are shown in stick format and are colored by atom type. Image: Penn State University