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Integrator has critical roles in noncoding RNA 3'-end processing as well as transcription attenuation of selected mRNAs. IntS11 is the endonuclease for RNA cleavage, as a part of the IntS4-IntS9-IntS11 complex (Integrator cleavage module, ICM). Our structure of the Drosophila ICM, determined by cryo-electron microscopy at 2.74 A resolution, unexpectedly revealed the stable association of an inositol hexakisphosphate (IP6) molecule. The binding site is located in a highly electropositive pocketdoi:10.1101/2021.09.14.460315 fatcat:nt34ncjh65abrdt7znoevmxqom