Revision as of 12:23, 1 November 2017

Rop protein - SynORI Inducible global copy number regulator(All groups)

This device is a fully functional inducible global copy number regulator that works with SynORI framework and other systems based on ColE1 origin of replication. It consists of rhamnose promoter and ROP protein.

With this device plasmid copy number can be lowered globally (device affects every plasmid group of SynORI system) by increasing rhamnose concentration and therefor increasing ROP protein expression

See how this part fits into the whole SynORI framework by pressing here!

Sequence and Features

Introduction

Biology

ColE1 plasmid replication overview

Figure 1. Main principles of ColE1 plasmid family replication. (Citation needed)

ColE1-type plasmid replication begins with the synthesis of plasmid encoded RNA II (also called primer transcript) by RNA polymerase which initiates transcription at a site 555bp upstream of origin of replication. The RNA transcript forms a RNA - DNA hybrid with template DNA near the origin of replication. Hybridized RNA is then cleaved at the replication origin by RNAse H and serves as a primer for DNA synthesis by DNA polymerase I (Figure 1. A).

Initiation of replication can be inhibited by plasmid encoded small RNA, called RNA I . Synthesis of RNA I starts 445 bp upstream of the replication origin and proceeds in the direction opposite to that of RNA II synthesis and terminates near the RNA II transcription initiation site. RNA I binds to RNA II and thereby prevents the formation of a secondary structure of RNA II that is necessary for hybridization of RNA II to the template DNA (Figure 1. B).

For RNA I to inhibit primer formation, it must bind before the nascent RNA II transcript extends to the replication origin. Consequently, the concentration of RNA I and the rate of binding of RNA I to RNA II is critical for regulation of primer formation and thus for plasmid replication.

The interaction between RNA I and RNA II can be amplified by Rop protein, see part:BBa_K2259010.

Usage with SynORI (Framework for multi-plasmid systems)

About SynORI

SynORI is a framework for multi-plasmid systems created by Vilnius-Lithuania 2017 which enables quick and easy workflow with multiple plasmids, while also allowing to freely pick and modulate copy number for every unique plasmid group! Read more about [http://2017.igem.org/Team:Vilnius-Lithuania SynORI here]!

This device in SynORI

This is a inducible copy number device which sets a specific copy number for each plasmid group irrespective of groups present in the system. ROP protein expression is induced by different concentrations of rhamnose, therefor allowing to change the plasmid copy number when required without the need to build new system.

Further details

For more background information and indepth insight on this part's design please see the individual part page of ROP protein part:BBa_K2259010.

See the [http://2017.igem.org/Team:Vilnius-Lithuania Vilnius-Lithuania 2017 team wiki] for more insight about our synthetic origin of replication (SynORI).

Characterization of RNA II (Vilnius-Lithuania 2017)

Plasmid with SynORI constitutive number devices copy calculation

References