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. 2011 May;77(9):2916–2925. doi: 10.1128/AEM.02554-10

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Copyright © 2011, American Society for Microbiology

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Fig. 4. — Phylogeny of the Shiga toxin antiterminator Q regulators in E. coli O157:H7. The prototypical SO strain EC4115 carries three distinct transcription antiterminators regulating toxin production in the stx₂-, stx_2c-, and potentially stx₁-converting prophages. The antiterminator antQ colocalizing with stx₁ (stx₁-antQ) and antiterminator stx₂-antQ of strain EC4115 (ECH74115_3220, ECH74115_3538, 144 aa) share 95.4% nucleotide identity, featuring 23 SNPs, and 97.2% protein identity, while stx₁-antQ and stx₂-antQ show no identity with stx_2c-antQ′ (EC74115_2910, 163 aa) at the nucleotide sequence level and only weak protein identities of 22.8% and 23.4%, respectively (81).