It is a composite part from multiple, individual Genomic sequences that have been assembled via AAA Assembly
This construct is an example of the switch system that was used in our project. Once the E. coli cells containing our construct was induced with IPTG, the pLamdaR pathway would be shut down while the pLac pathway would be turned on. This allows for the degradation of the gene of interest in which this case is the eGFP. This construct is the finished product of our project after using 3A Assembly to assemble the two different promoter pathways. This construct is switchable because IPTG can be added to switch the system from one pathway to another. NOTE: There is no Biobrick scar between Bba_K1911005 and Bba_M0051. The Sequence given will contain a scar of, "tactagag" which is to be ignored.
RBS (Elowitz 1999) -- defines RBS efficiency
Varies from -6 to +1 region from original sequence to accomodate BioBricks suffix. No secondary structures are formed in the given RBS region. Users should check for secondary structures induced in the RBS by upstream and downstream elements in the +50 to -50 region, as such structures will greatly affect the strength of the RBS. Contact info for this part: Brian Chow
Vinay S Mahajan, Voichita D. Marinescu, Brian Chow, Alexander D Wissner-Gross and Peter Carr IAP, 2003.
A synthetic oscillatory network of transcriptional regulators , Elowitz M.B. , Leibler S., Nature(403),335-38: 2000
The cI regulated promoter is based on the pR promtoer from bacteriohage lambda. The promoter has two two DNA binding sites for lambda cI repressor <bb_part>BBa_C0051</bb_part>. cI binding results in repression of transcription. The specific sequence used here is based on the cI repressible promoter used in the Elowitz repressilator (and references therein).
In order to address concerns about the promoter transcribing in the reverse direction, we have removed the -35 and -10 signals responsible for the promoter activity in the reverse direction. (More details needed here! DE, 2/24/03) Incompatible with host expressing cI repressor.
Vinay S Mahajan, Brian Chow, Peter Carr, Voichita Marinescu and Alexander D. Wissner-Gross
represillator of Elowitz and Leibler (2000)
Coding region for the LacI protein with an LVA degradation tail and without an RBS. LacI binds to the pLac regulator <bb_part>BBa_R0010</bb_part> and PLlac01 hybrid regulator <bb_part>BBa_R0011</bb_part> and inhibits transcription. IPTG (Isopropylthiogalactoside) binds to LacI and inhibits its operation, therefore promoting transcription. A rapid degredation tail (LVA) has been added to improve the High to Low performance of this part.
References (unparsed) here: Elowitz, M.B., Leibler, S. A synthetic oscillatory network of transcriptional regulators. Nature 403, 335-338 (2000). [ELOW00] References (unparsed) here: Elowitz, M.B., Leibler, S. A synthetic oscillatory network of transcriptional regulators. Nature 403, 335-338 (2000). [ELOW00] Sequence taken from the repressilator of Elowitz and Leibler (2000). The obtained sequence was compared to the wild-type sequence for LacI obtained through a database search. The sequence had been modified from the wild-type in that wild-type GTG start was changed to an ATG start (note, actual ORF in E.coli has several GTG starts it would seem). The LVA tag has been added for quicker degradation. Incompatible with systems containing LacI, lactose, or IPTG.
Grace Kenney, Daniel Shen, Neelaksh Varshney, Samantha Sutton
RBS.4 (weaker) -- derivative of BBa_0030
Weaker RBS based on Ron Weiss thesis. Strengths relative to <bb_part>BBa_B0030</bb_part>, <bb_part>BBa_B0031</bb_part>, <bb_part>BBa_B0032</bb_part>.
Varies from -6 to +1 region from original sequence to accomodate BioBricks suffix ("RBS-3" in figure 4-14 of thesis). No secondary structures are formed in the given RBS region. Users should check for secondary structures induced in the RBS by upstream and downstream elements in the +50 to -50 region, as such structures will greatly affect the strength of the RBS. Contact info for this part: Brian Chow
GFP is originally found in jellyfish Aequorea victoria but eGFP has been modified to be more sensitive. It helps the observers to easily determine the green coloration of the GFP protein.
eGFP = Enhanced green fluorescent protein which can be used as a reporter gene. eGFP was used in our project to show the effects of attaching the DAS and LAA degradation tag to a target gene which is then degraded by the ClpXP system. In essence, the eGFP should be less prominent in E. coli cells which contain DAS tags and LAA tags compared to the E. coli cells that have constructs which do not have any degradation tags attached to the eGFP. eGFP can be used as a reporter gene and helps the observer easily see the coloration of E. coli cells which indicate a successful transformation.
The eGFP could not contain any illegal restriction enzyme sites as it would cut the sequence up, not allowing for the expression of the eGFP protein.
Derived from the TE terminator of T7 bacteriophage between Genes 1.3 and 1.4 <genbank>V01146</genbank>.
Transcription terminator for the E.coli RNA polymerase.
Suggested by Sri Kosuri and Drew Endy as a high efficiency terminator. The 5' end cutoff was placed immediately after the TAA stop codon and the 3' end cutoff was placed just prior to the RBS of Gene 1.4 (before AAGGAG). Use anywhere transcription should be stopped when the gene of interest is upstream of this terminator.
Transcriptional terminator consisting of a 64 bp stem-loop.
cI repressor from E. coli phage lambda (+LVA)
Elowitz, M. B. Transport, Assembly, and Dynamics in Systems of Interacting Proteins. Thesis, Princeton Univ., Princeton (1999).
Coding region for the cI repressor based on cI repressor from bacteriophage lambda modified with an LVA tail for rapid degradation of the protein. cI repressor binds to the cI regulator (BBa_R0051).
References (unparsed) here: A synthetic oscillatory network of transcriptional regulators , Elowitz M.B. , Leibler S., Nature(403),335-38: 2000 Octamerization of CI repressor is needed for effective repression of PRM and efficient switching from lysogeny. Ian B. Dodd,1 Alison J. Perkins, Daniel Tsemitsidis, and J. Barry Egan , Genes and Development (Vol 15, No. 22) 3013-3022: 2001 References (unparsed) here: A synthetic oscillatory network of transcriptional regulators , Elowitz M.B. , Leibler S., Nature(403),335-38: 2000 Octamerization of CI repressor is needed for effective repression of PRM and efficient switching from lysogeny. Ian B. Dodd,1 Alison J. Perkins, Daniel Tsemitsidis, and J. Barry Egan , Genes and Development (Vol 15, No. 22) 3013-3022: 2001 BBa_C0051 cI repressor is based on the cI repressor from the Elowitz's repressilator. It has been modified to include a rapid degradation LAA tail, and includes the BioBrick standard assembly head and tail restriction sites. The RBS has been removed. The stop codon has been changed from TAA to a double stop codon TAATAA.
Promoter (lacI regulated, lambda pL hybrid)
Inverting regulatory region controlled by LacI (<bb_part>BBa_C0010</bb_part>, <bb_part>BBa_C0011</bb_part>, etc.) The PLlac 0-1 promoter is a hybrid regulatory region consisting of the promoter P(L) of phage lambda with the cI binding sites replaced with lacO1. The hybrid design allows for strong promotion that can nevertheless be tightly repressed by LacI, the Lac inhibitor (i.e. repressor) (<bb_part>BBa_C0010</bb_part>) ([LUTZ97]). The activity of the promoter can be regulated over a >600-fold range by IPTG in E.Coli DH5-alpha-Z1 (same paper reference).
hybrid promoter design to create strong promoter that is, at the same time, highly repressible. note that the upstream operator installed in this hybrid is slightly different than the one in the original source (Lutz and Bujard, 1997). the most upstream operator region is slightly truncated in the represillator version, so that both operators in the hybrid are the same sequence. see references for details. also, the sequence has been truncated after the transcriptional start site. LacI binds to this regulator. This part is incompatible with species containing active LacI coding regions. Lactose and IPTG disable the operation of LacI and increase transcription. This part is incompatible with environments containing lactose or lactose analogs.
Neelaksh Varshney, Grace Kenney, Daniel Shen, Samantha Sutton
ClpP is a naturally present gene in the E. coli genome. The ClpP sequence was pulled from the E. coli genome.
The ClpP gene codes for the ClpP subunit protein which works together with the ClpX subunit to break down proteins that are tagged with degradation tags. The ClpXP system identifies tagged proteins and proceeds to unfold the protein and break it down into individual amino acids. The ClpXP system along with degradation tags can be used to break down certain proteins which are produced by certain genes of interest and it has a range of applications such as measuring how fast a certain protein can be degraded in a cell.
The sequence came from the E. coli genome so there were no design considerations to deal with while obtaining the ClpP sequence.
ClpX is found naturally in the E. coli genome.
ClpX is part of the protein-degradation system called ClpXP. It works in unison with another protein called ClpXP so that it can de-linearize and unfold proteins into amino acids which can then be recycled by the cells. In E. coli cells, ClpXP focuses on degrading incorrect proteins and reducing them down into amino acids which can be recycled by the cells. ClpXP recognizes the incorrect proteins by certain SsrA-tags which are attached at the ends of incorrect proteins. ClpX in unison with ClpP can be used to degrade unwanted proteins and can be used in future projects in conjunction with certain degradation tags.
There were illegal restriction sites which cut the ClpX gene into smaller sequences, rendering it obsolete. So we had to introduce wobbles to eliminate these illegal restriction sites so that ClpX may be expressed and allowed to function as a complete protein.
Conversion of the iGEM parts registry to SBOL2.1