Atomic coordinates are deposited in the Research Collaboratory for Structural Bioinformatics Protein Data Bank (RCSB PDB) under the following accession codes: PDB 9I0K (MsmIMPDH E-XMP* intermediate, compressed), PDB 9I0L (MsmIMPDH E-XMP* intermediate, extended), and PDB 9I0M (MsmIMPDH ATP + IMP, extended). Cryo-EM maps are deposited in the Electron Microscopy Data Bank (EMDB) under the following accession codes: EMD–52559 (MsmIMPDH E-XMP* intermediate, compressed), EMD–52560 (MsmIMPDH E-XMP* intermediate, extended), and EMD–52561 (MsmIMPDH ATP + IMP, extended).

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