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Rop protein - global copy number inhibitor (SynORI framework)

Rop (also known as repressor of primer) is a small protein responsible for keeping the copy number of ColE1 and related bacterial plasmids low in E. coli. Inhibits plasmid replication of all SynORI framework plasmid groups non-specifically, also other ColE1 replicon plasmids.

Sequence and Features

Figure 1. Structure of the ColE1 Rop protein, at 1.7 angstroms resolution.^[1]

Introduction

Biology

Repressor of primer (ROP) is a small dimeric protein that participates in ColE1 plasmid family copy number control, by increasing affinity between two complementary RNAs - RNA I (Replication inhibitor) and RNA II (Replication activator). ^[2] By increasing affinity of the two RNA molecules Rop decreases the rate of of plasmid replication initiation events.

Rop dimer is a bundle of four tightly packed alpha helices that are held by hydrophobic interactions (Fig. 1).

Usage with SynORI (Framework for multi-plasmid systems)

Characterization of Rop protein (Vilnius-Lithuania 2017)

References

1. ↑ Banner DW, Kokkinidis M, Tsernoglou D. Structure of the ColE1 Rop protein at 1.7 Å resolution. J Mol Biol. 1987 m.;196(3):657–75.
2. ↑ Castagnoli L, Scarpa M, Kokkinidis M, Banner DW, Tsernoglou D, Cesareni G. Genetic and structural analysis of the ColE1 Rop (Rom) protein. The EMBO Journal. 1989;8(2):621-629.