5XJ0:
reference: A Thermus phage protein inhibits host RNA polymerase by preventing template DNA strand loading during open promoter complex formation., Ooi WY, Murayama Y, Mekler V, Minakhin L, Severinov K, Yokoyama S, Sekine SI, Nucleic Acids Res. 2017 Nov 20. pii: 4641909. doi: 10.1093/nar/gkx1162. PMID: 29165680

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