Difference between revisions of "Part:BBa K1189024"
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<p>This part is the light ferritin subunit from human ferritin sourced from <a href="http://www.uniprot.org/uniprot/P02792">P02792 [UniParc]</a>. This part, along with the heavy ferritin (<partinfo>BBa_K1189025</partinfo> P02792 [UniParc]), form the ferritin nanoparticle, an iron-storage particle made up of 24 subunits (Chasteen <i>et al.</i>, 1991). The formed nanoparticle is a robust, remaining stable at extreme pHs and temperatures. The light ferritin purportedly contributes to nucleation to initiate iron core formation in ferritin molecules (Chasteen <i>et al.</i>, 1999).
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<p>This part is the light ferritin subunit from human ferritin sourced from <a href="http://www.uniprot.org/uniprot/P02792">P02792 [UniParc]</a>. Ferritin is ubiquitous across prokaryotic and eukaryotic systems and is used to buffer intracellular iron. This part, along with the <a href="https://parts.igem.org/wiki/index.php?title=Part:BBa_K1189025">heavy ferritin subunit</a>, form a 24 multimeric iron sequestering nanoparticle (Chasteen <i>et al.</i>, 1991). The light ferritin purportedly contributes to nucleation to initiate iron core formation in ferritin molecules (Chasteen <i>et al.</i>, 1999). These nanoparticles are robust, remain stable at extreme pHs, and withstand temperatures variations.  
 
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<h1>Ferritin's utility in iGEM</h1>
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This nanoparticle can also be used as a reporter when the iron core is modified with potassium ferrocyanide to form Prussian Blue. The Prussian Blue ferritin can then act as a peroxidase mimic, similar to horseradish peroxidase, resulting in colour changes in the presence of hydrogen peroxide, and TMB or ABTS (Zhang <i>et al.</i>, 2013).
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<p>Ferritin as a nanoparticle is interesting for other iGEM teams for two reasons. Firstly, its iron core can be replaced with other compounds to serve different functions. The <a href="http://2013.igem.org/Team:Calgary">iGEM Calgary 2013</a> demonstrated this by chemically modifying recombinant ferritin's iron core into a <a href="http://2013.igem.org/Team:Calgary/Project/OurSensor/Reporter/PrussianBlueFerritin">robust colourmetric reporter</a>. Other intriguing applications include making ferritin’s iron core magnetically active as magnetoferritin (Jordan et al. 2013), using ferritin as a nanocage for other metals, or the incorporation of other reporters such as quantum dots (Naito et al. 2013) (Figure 2).</p>
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This part was primarily used to construct <partinfo>BBa_K1189020</partinfo> in order to allow us to express and purify the protein.
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<img src="https://static.igem.org/mediawiki/2013/b/b8/UCalgary2013TRFerritincorechange.png" alt="Ferritin Core Modulation" width="800" height="400">
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<p><b>Figure 2.</b> Chemically modifying the iron core of ferritin allows ferritin to be moulded to fit a wide magnitude of applications. Additionally the ferritin subunits can act as a nanocage to encapsulate completely new cores. </p>
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<p>Secondly, the ferritin nanoparticle is useful for iGEM teams as a self-assembling and spherical protein scaffold. Each of the 24 subunits forming ferritin can be fused proteins of interest, such that when the nanoparticle assembles, proteins surround the ferritin sphere (Kim et al., 2011). The <a href="2013.igem.org/Team:Calgary">iGEM Calgary 2013 team</a> demonstrated this by binding DNA sensing proteins, TALEs, as part of their <a href="http://2013.igem.org/Team:Calgary/Project/OurSensor">FerriTALE sensor</a>. The Calgary team also constructed ferritin subunits with a coiled-coil linker system so that other teams can scaffold proteins to E coil ferritin. See Figure 3 for a demonstration of these applications.</p>
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<img src="https://static.igem.org/mediawiki/2013/0/07/UCalgary2013TRCoilflexibility.png" alt="FerriTALE Scaffold Modularity" width="800" height="219" >
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<p><b>Figure 4.</b> Using the E and K coils in combination with ferritin as a scaffold system allows the creation of brand new FerriTALEs or protein scaffolds.</a></p>
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Revision as of 06:44, 30 October 2013


Light chain human ferritin

This part is the light ferritin subunit from human ferritin sourced from P02792 [UniParc]. Ferritin is ubiquitous across prokaryotic and eukaryotic systems and is used to buffer intracellular iron. This part, along with the heavy ferritin subunit, form a 24 multimeric iron sequestering nanoparticle (Chasteen et al., 1991). The light ferritin purportedly contributes to nucleation to initiate iron core formation in ferritin molecules (Chasteen et al., 1999). These nanoparticles are robust, remain stable at extreme pHs, and withstand temperatures variations.

Ferritin

Figure 1. Ribbon visualization of a fully assembled ferritin protein.

Ferritin's utility in iGEM

Ferritin as a nanoparticle is interesting for other iGEM teams for two reasons. Firstly, its iron core can be replaced with other compounds to serve different functions. The iGEM Calgary 2013 demonstrated this by chemically modifying recombinant ferritin's iron core into a robust colourmetric reporter. Other intriguing applications include making ferritin’s iron core magnetically active as magnetoferritin (Jordan et al. 2013), using ferritin as a nanocage for other metals, or the incorporation of other reporters such as quantum dots (Naito et al. 2013) (Figure 2).

Ferritin Core Modulation

Figure 2. Chemically modifying the iron core of ferritin allows ferritin to be moulded to fit a wide magnitude of applications. Additionally the ferritin subunits can act as a nanocage to encapsulate completely new cores.

Secondly, the ferritin nanoparticle is useful for iGEM teams as a self-assembling and spherical protein scaffold. Each of the 24 subunits forming ferritin can be fused proteins of interest, such that when the nanoparticle assembles, proteins surround the ferritin sphere (Kim et al., 2011). The iGEM Calgary 2013 team demonstrated this by binding DNA sensing proteins, TALEs, as part of their FerriTALE sensor. The Calgary team also constructed ferritin subunits with a coiled-coil linker system so that other teams can scaffold proteins to E coil ferritin. See Figure 3 for a demonstration of these applications.

FerriTALE Scaffold Modularity

Figure 4. Using the E and K coils in combination with ferritin as a scaffold system allows the creation of brand new FerriTALEs or protein scaffolds.

Applications of BBa_K1189024

This part used primarily for the construction of parts containing the light ferritin subunit (BBa_K1189020 BBa_K1189018).

References

Chasteen, N. D., & Harrison, P. M. (1999). Mineralization in ferritin: an efficient means of iron storage. Journal of structural biology, 126(3), 182-194.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI.rc site found at 391