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. 2019 Aug 8;47(17):9259–9270. doi: 10.1093/nar/gkz676

Figure 4.

Figure 4.

Plasmid immunity assays of Mtb Csm in heterologous host Escherichia coli. (A) C43 harbouring pCsm1–6 and pCRISPR are transformed with pRAT (control plasmid) or with pRAT-target (plasmid with pUC19 MCS target). Target transcription was arabinose-inducible. In the absence of arabinose, the transformation efficiency was independent of the presence or absence of target; whereas when target transcription was induced, a 2-log reduction of transformation efficiency was observed for the target plasmid compared to the control plasmid. *** P-value (Welch two sample test, two tailed) < 1e-05; significance threshold at < 0.05. (B) C43 harbouring pCsm1–6 or indicated mutants and pCRISPR_TetR (target tetracycline resistance gene, constitutively expressed) were transformed with pRAT. Vector control (Ctrl): backbone vectors without inserts; WT Csm, Csm1–5 only (ΔCsm6, C6), Csm3 D35A (C3), Csm1 (Cas10) D630A/D631A (cyclase mutant, Cy), Cas10 H18A/D19A (HD mutant, HD).