Part:BBa_K2259075

SynORI global copy number control device (Anderson 0.24)

This device is a fully functional synthetic origin of replication that sets a constitutive copy number of every plasmid group in the system. Different concentrations of ROP protein provide a different copy number of plasmids.

Note: introducing this device into a SynORI framework will lower the plasmid copy number of every group in system.

Devices from the same series that have different Anderson promoters: part:BBa_K2259052 (0 Anderson), part:BBa_K2259053 (0.15 Anderson), part:BBa_K2259075 (0.24 Anderson).

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

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  INCOMPATIBLE WITH RFC[12]

  Illegal NheI site found at 685
  Illegal NheI site found at 708
  
• 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

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 constitutive global copy number modulator device which lowers plasmid copy number of every group in the system bypassing the selective control of different groups. These constitutive devices can be used with different Anderson promoters to select a different copy number.

Devices from the same series that have different Anderson promoters: part:BBa_K2259052 (0 Anderson), part:BBa_K2259053 (0.15 Anderson), part:BBa_K2259075 (0.24 Anderson).

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

Further details

For more background information and indepth insight on this part's design please see the individual part pages of part:BBa_K2259000 and part:BBa_K2259010.

Characterization of RNA II (Vilnius-Lithuania 2017)

Constitutive Rop protein effect on plasmid copy number

To be updated!