Difference between revisions of "Part:BBa K2259075"
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<partinfo>BBa_K2259075 short</partinfo>
 
<partinfo>BBa_K2259075 short</partinfo>
  
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RNA II acts as a plasmid replication initiator. The transcript folds into a secondary structure which stabilizes the interaction between the nascent RNA and the plasmids DNA. This RNA-DNA hybrid is attacked by RNase H, which cleaves the RNA strand, exposing a 3' hydroxyl group. This allows the extension of the leading strand by DNA polymerase I and consequently, the start of plasmid replication.
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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 a plasmids.
  
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*Caution! <B>RNA II (Group A)</b> indicates that this plasmid only interacts with regulatory <B>RNA I (Group A)</b> <LINK TO RNA I A> from SynORI (framework for multi-plasmid systems) collection and is stable when placed with other SynORI plasmid groups. RNA II A will not be regulated with RNA I from another group!
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Note: introducing this device into a SynORI framework will lower the plasmid copy number of every group in system.  
  
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See how this part fits into the whole SynORI framework [[#About SynORI|by pressing here!]]
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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).
  
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See how this part fits into the whole SynORI framework [[#About SynORI|by pressing here!]]
  
 
<span class='h3bb'>Sequence and Features</span>
 
<span class='h3bb'>Sequence and Features</span>
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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]!
 
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]!
  
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===Regulative RNA II molecule in SynORI===
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===This device in SynORI===
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RNA II gene is foundational and central biobrick of SynORI system and by far the only one that is mandatory for a framework to run.
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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.
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The two main functions of RNA II is as follows:
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# Initiating plasmid replication
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# Interacting with RNA I of specific plasmid group [[#Specific RNA II versions in multi-plasmid systems|(See below)]]
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=== RNA II and RNA I in the engineering of unique plasmid groups for multi-plasmid system===
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RNA II molecule interacts with inhibitory RNA I molecule with three secondary structure RNA stem loops. In order to create plasmid groups with independent copy number control, one group's RNA II molecule must interact only with the same group's RNA I molecule.
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<b>For example</b> if there are two plasmid groups in a cell - A and B - RNA II of A group
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would only interact with RNA I A, and not RNA I B.
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[[Image:RnainteractionIII.png|center|500px|thumb|<b>Figure 1. </b> RNA I AND II group interaction example]]
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See the [https://parts.igem.org/Part:BBa_K2259000:Design Design] section or [http://2017.igem.org/Team:Vilnius-Lithuania Vilnius-Lithuania 2017 team wiki] for more insight about our synthetic origin of replication (SynORI).
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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).
  
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===Origin of RNA II biobrick===
 
  
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If RNA II and RNA I are naturally an antisense system, why are there two separate constructs in SynORI system?
 
  
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In order to flexibly control the synthesis of RNA I, the RNA I gene first needed to be inactivated in the ColE1 origin of replication. That, however, was not a trivial task, because by changing RNA I promoter sequence, one also changes the RNA II secondary structure, which is crucial for plasmid replication initiation. This is the main reason why, in the SynORI framework, the wildtype ColE1 ORI is split into two different parts - <b> RNR I and RNA II </b>.
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See the [http://2017.igem.org/Team:Vilnius-Lithuania Vilnius-Lithuania 2017 team wiki] for more insight about our synthetic origin of replication (SynORI).
  
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<Picture of how RNA I promoter mutations might destroy RNA II secondary structure.>
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===Further details===
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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)=
 
=Characterization of RNA II (Vilnius-Lithuania 2017)=
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==RNA I inactivation in wild type replicon==
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==Constitutive Rop protein effect on plasmid copy number==
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To be updated!
  
 
==References==
 
==References==
 
<references />
 
<references />

Revision as of 22:13, 31 October 2017


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 a 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
    INCOMPATIBLE WITH RFC[21]
    Unknown
  • 23
    INCOMPATIBLE WITH RFC[23]
    Unknown
  • 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]!

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!

References