PDB Method Taxonomy Organism Name Reference_pub Resolution Stage  Contents   Ligands 
7MKJ EM Prokaryote Escherichia coli, Escherichia phage T7 Cryo-EM structure of Escherichia coli RNA polymerase bound to T7A1 promoter DNA 34599106 2.90Å RNAP RNAP,RNA polymerase sigma factor RpoD 1N7[CHAPSO],ZN,MG