Device

Part:BBa_K1919300

Designed by: Shaobo Yang   Group: iGEM16_SCU-China   (2016-09-16)
Revision as of 18:09, 16 October 2016 by Shaobo (Talk | contribs)


livJ

LivJ encodes periplasmic binding protein for branched-chain amino acid ABC transporter which is encodes by operon livHMGF. The livJ gene product binds leucine, isoleucine, and valine. Please note that there is a short guide peptide on N terminal of livJ coding region, which is used to guide the precusor to be transported into periplasmic room. This device constructed in our team contains a promoter J23100, a RBS, livJ coding region and a terminator. The device can be transferred into E.coli and overexpress livJ directly. The expression of the livJ RNA in the part has been studied via qPCR.The quantified result suggests that compared with negtive control of E.coli (not cantain the plasmid), livJ has been highly expressed in E.coli BL21 and E.coli DH5a.


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 7
    Illegal NheI site found at 30
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal NgoMIV site found at 382
    Illegal AgeI site found at 203
    Illegal AgeI site found at 485
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal SapI site found at 366


Quantitative PCR exams expression levels of liv operon

Liv operon (leucine isoleucine valine) contains six genes. We cloned all those genes into overexpression vector in which livJKHMGF are under control of promoter J23100. All those devices have been transferred into E.coli and RNA expression levels are scrutinized via qPCR. In the trial, we regarded two genes, rrsA and dnaA, as reference. The rrsA gene transcripts 16s RNA while dnaA encodes a component of DNA polymerase. The expression level of rrsA is very high whereas the dnaA expression level is quite low. Generally speaking, the expression level of gene we need to study is always higher than dnaA and lower than rrsA. The two reference genes expression level are relatively stable.

Figure 1: Fermentation of E. coli KRXwith BBa_K863005 (ECOL) in an Infors Labfors Bioreactor, scale: 3 L, [http://2012.igem.org/Team:Bielefeld-Germany/Protocols/Materials#Autoinduction_medium autoinduction medium] + 60 µg/mL chloramphenicol, 37 °C, pH 7, agitation on cascade to hold pO2 at 50 %, OD600 measured every 30 minutes.
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