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. 2021 Mar 21;49(7):3826–3840. doi: 10.1093/nar/gkab183

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© The Author(s) 2021. Published by Oxford University Press on behalf of Nucleic Acids Research.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Genetic map of Csp231I R-M system (not to scale), comprising its: regulator (C gene and its promoter P_C), REase (and its two promoters: major P_R1 and minor P_R2; 8nt apart) and MTase (and its P_M). The promoters are designated by arrows. The C-box (C binding site) consists of a pair of inverted repeats CTAAG-n5-CTTAG, marked as black bars. Production of C protein results in occupation of the left part of the C-box and subsequently the left and right part as a tetramer at higher C concentrations. The C protein provides an autoregulatory negative feed-back loop for its own transcription and also, to a lesser extent, for REase transcription due to bicistronic mRNA initiated from P_C.