Composite

Part:BBa_K2259091

Designed by: Laurynas Karpus   Group: iGEM17_Vilnius-Lithuania   (2017-10-27)
Revision as of 16:15, 31 October 2017 by Bordeaux (Talk | contribs)


SynORI inducible plasmid copy number device

This device consists of replication initiator RNA II that is modulated by replication regulator RNA I under the control of rhamnose promoter.

Increased rhamnose concentrations lead to increase in RNA I and consequently - decrease in plasmid copy number.

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


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]



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

Aboutsynoritry1.png

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]!

Regulative RNA II molecule in SynORI

This device demonstrates SynORI framework ability to create an inducible plasmid copy number device.

Characterization (Vilnius-Lithuania 2017)

RNA I and rhamnose

References

[edit]
Categories
//awards/composite_part/winner
//collections/synori
Parameters
None