Difference between revisions of "Part:BBa K3132016"

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<partinfo>BBa_K3132016 short</partinfo>
 
<partinfo>BBa_K3132016 short</partinfo>
  
The second generation CAR design, which fused a scFv, a CD8a hinge, a CD8 transmembrane domain, a 4-1BB intracellular domain and a CD3ζ chain in tandem was used in our project  (Fig. 1). We designed two chimeric receptors that contain scFv derived from antibodies that recognize human EGFR and HER2. Cetuximab (anti-EGFR) and Trastuzumab (anti-HER2) were chosen because these antibodies have been found to be safe in patients when administered as targeted drugs. And therefore, these two receptors were named CTX.CAR and TTZ.CAR receptor, respectively. Unpaired cysteine 164 within the CD8a hinge region was replaced with a serine to increase CAR expression as reported previously.
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<B>Why we choose GEMS:</B>
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GEMS, which is also named as Generalized Extracellular Molecule Sensor, is a highly generalizable modular platform that was first published in 2018. In this literature, the author constructed sensors for non-signaling molecules with a wide range of molecular weights to confirm the validity and generalizability of the GEMS, and found these GEMS devices are the first examples of 2.sensing soluble molecules with scFv-coupled receptors that 1.utilize natural signaling cascades rewired for transgene expression,unlike the previous membrane surface receptors which can only detect membrane marker. 3.The easy adaptability of the GEMS platform to new targets should make it a useful tool for many applications in synthetic biology and for developing novel precision-guided cell-based therapeutics.
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<B>Structure of GEMS:</B>
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GEMS consists of three structural domains: an extracellular domain, a transmembrane domain, and an intracellular domain (fig.1).The extracellular domain is based on an EpoR scaffold. After introducing a mutation into the erythropoietin receptor to render it inert to erythropoietin, it can be fused to affinity domains such as antibody fragments, then the two form a whole as extracellular receptor for signals. The EpoR transmembrane domain was fused to the intracellular signal transduction domains. Once activated, these intracellular domains can induce downstream signaling pathways and regulate gene expression.  
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<B>Mechanism of GEMS:</B>
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Inactive EpoR dimers are locked by transmembrane helix interactions in a conformation that prevents downstream signaling. Ligand binding to the receptors is thought to rotate each receptor subunit around its own axis and is likely accompanied by an increase in the distance between intracellular domains. The combination of these effects triggers downstream signaling (fig.2).
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Revision as of 12:17, 17 October 2019


Generalized extracellular molecule sensor platform

Why we choose GEMS: GEMS, which is also named as Generalized Extracellular Molecule Sensor, is a highly generalizable modular platform that was first published in 2018. In this literature, the author constructed sensors for non-signaling molecules with a wide range of molecular weights to confirm the validity and generalizability of the GEMS, and found these GEMS devices are the first examples of 2.sensing soluble molecules with scFv-coupled receptors that 1.utilize natural signaling cascades rewired for transgene expression,unlike the previous membrane surface receptors which can only detect membrane marker. 3.The easy adaptability of the GEMS platform to new targets should make it a useful tool for many applications in synthetic biology and for developing novel precision-guided cell-based therapeutics. Structure of GEMS: GEMS consists of three structural domains: an extracellular domain, a transmembrane domain, and an intracellular domain (fig.1).The extracellular domain is based on an EpoR scaffold. After introducing a mutation into the erythropoietin receptor to render it inert to erythropoietin, it can be fused to affinity domains such as antibody fragments, then the two form a whole as extracellular receptor for signals. The EpoR transmembrane domain was fused to the intracellular signal transduction domains. Once activated, these intracellular domains can induce downstream signaling pathways and regulate gene expression. Mechanism of GEMS: Inactive EpoR dimers are locked by transmembrane helix interactions in a conformation that prevents downstream signaling. Ligand binding to the receptors is thought to rotate each receptor subunit around its own axis and is likely accompanied by an increase in the distance between intracellular domains. The combination of these effects triggers downstream signaling (fig.2).


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 1477
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BglII site found at 2163
    Illegal BglII site found at 2444
    Illegal BamHI site found at 70
    Illegal BamHI site found at 1770
    Illegal XhoI site found at 64
    Illegal XhoI site found at 991
    Illegal XhoI site found at 2303
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal NgoMIV site found at 2348
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI.rc site found at 2234
    Illegal BsaI.rc site found at 2598
    Illegal SapI.rc site found at 1566
    Illegal SapI.rc site found at 1581