6JQ4:
reference: Conformational changes of antitoxin HigA from Escherichia coli str. K-12 upon binding of its cognate toxin HigB reveal a new regulation mechanism in toxin-antitoxin systems., Xu BS, Liu M, Zhou K, Geng Z, Gao ZQ, Dong YH, She Z, Liu QS, Biochem Biophys Res Commun. 2019 Apr 20. pii: S0006-291X(19)30689-8. doi:, 10.1016/j.bbrc.2019.04.061. PMID: 31014676

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