Team:UCL/Project/Marker

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<p class="major_title">MAJOR TITLE</p>
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<p class="major_title">Matrix metalloproteinase-9</p>
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<p class="minor_title">Minor Title</p>
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<p class="minor_title">For β-amyloid Degradation</p>
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To easily select cells that were transfected with our <a href="https://2013.igem.org/Team:UCL/Project/Circuit" target="_blank">genetic circuit</a>, particularly the human cells HeLA and microglia, we required a selectable marker that would work in all of our <a href="https://2013.igem.org/Team:UCL/Project/Chassis" target="_blank">chassis</a>, and would enable us to easily eliminate cells that had not taken up our recombinant plasmid. Zeocin is a widely used glycopeptide antibiotic, a formulation of phleomycin D1. It is capable of binding to and cleaving DNA, leading to cell necrosis in both eukaryotes and aerobic prokaryotes. Commonly outside of cells, in copper-chelated form, zeocin is inactive. When zeocin enters a cell, the Cu2+, which makes it appear blue, is reduced to Cu+ and then removed, activating zeocin, which then intercalates into DNA <a href="http://tools.invitrogen.com/content/sfs/manuals/zeocin_man.pdf" target="_blank">(Invitrogen)</a>.
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A 375 base pair bacterial gene encodes the Streptoalloteichus hindustanus bleomycin resistance protein (She ble protein). The She ble protein in mammalian cells is predominantly localised at the nucleus, specifically at euchromatin <a href="http://www.ncbi.nlm.nih.gov/pubmed/7505390" target="_blank">(Calmels et al. 199)</a>. This small protein that has a strong affinity for antibiotics on a one to one ratio. It prevents zeocin from being activated by ferrous ions and oxygen, meaning it cannot react in vitro with DNA. However, the protection it confers, in human cells at least, while considerable, is not complete. However, it is an extremely useful selectable marker, that will be invaluable to the iGEM registry <a href="http://www.ncbi.nlm.nih.gov/pubmed/15755800" target="_blank">(Oliva-Trastoy 2005)</a>.
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<p class="body_text">.
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In order to establish that this BioBrick worked, we had to first determine zeocin’s killing efficacy against HeLa cells by creating a kill curve.
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</p>
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<div class="gap">
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</div>
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<div class="gap">
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<p class="minor_title">Creating The BioBrick</p>
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</div>
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<div class="gap">
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</div>
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</div>
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<div class="gap"></div>
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<p class="major_title">EXPERIMENTS AND RESULTS</p>
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<div class="row_small">
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<div class="part">
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<p class="minor_title">Kill Curve</p>
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<p class="body_text"></p>
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</div>
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<div class="gap"></div>
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<div class="row_small">
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<div class="part"></div>
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<div class="description">
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<p class="body_text">
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Results.
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<div class="gap"></div>
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<div class="row_small">
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<div class="part"></div>
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<div class="description">
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Zeocin resistance demonstration.
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<p class="body_text">
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Results.
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Revision as of 19:32, 7 September 2013

Matrix metalloproteinase-9

For β-amyloid Degradation

To easily select cells that were transfected with our genetic circuit, particularly the human cells HeLA and microglia, we required a selectable marker that would work in all of our chassis, and would enable us to easily eliminate cells that had not taken up our recombinant plasmid. Zeocin is a widely used glycopeptide antibiotic, a formulation of phleomycin D1. It is capable of binding to and cleaving DNA, leading to cell necrosis in both eukaryotes and aerobic prokaryotes. Commonly outside of cells, in copper-chelated form, zeocin is inactive. When zeocin enters a cell, the Cu2+, which makes it appear blue, is reduced to Cu+ and then removed, activating zeocin, which then intercalates into DNA (Invitrogen).

A 375 base pair bacterial gene encodes the Streptoalloteichus hindustanus bleomycin resistance protein (She ble protein). The She ble protein in mammalian cells is predominantly localised at the nucleus, specifically at euchromatin (Calmels et al. 199). This small protein that has a strong affinity for antibiotics on a one to one ratio. It prevents zeocin from being activated by ferrous ions and oxygen, meaning it cannot react in vitro with DNA. However, the protection it confers, in human cells at least, while considerable, is not complete. However, it is an extremely useful selectable marker, that will be invaluable to the iGEM registry (Oliva-Trastoy 2005).

. In order to establish that this BioBrick worked, we had to first determine zeocin’s killing efficacy against HeLa cells by creating a kill curve.

Creating The BioBrick

EXPERIMENTS AND RESULTS

Kill Curve

Results.

Zeocin resistance demonstration.

Results.

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