Difference between revisions of "Team:SF Bay Area DIYBio/Results"
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{{SF_Bay_Area_DIYBio}} | {{SF_Bay_Area_DIYBio}} | ||
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| + | ==Accomplishments== | ||
| − | + | ===Researched UV sources and built UV exposure rig to mimic solar UV=== | |
| + | *<font size=2>UVA: 320-400nm. “Tanning” wavelengths. Long-term free radical damage | ||
| + | *UVB: 280-320nm. Causes sunburn and direct DNA damage | ||
| + | *UVC: 100-280nm. Rapid skin and retinal damage (e.g.: germicidal UV in BSC)</font> | ||
| − | < | + | We want to mimic solar UV: broad-band UVA+UVB, but not UVC! After testing many UV sources, we settled on: |
| + | *<font size=2>UVB basking lamp for pet reptiles | ||
| + | *UVA nail curing lamp</font> | ||
| − | + | [[File:Spectra.png|950px]] | |
| − | + | ===Determined exposure level needed for >4 log decrease in CFU=== | |
| − | + | UV kill curve was generated for E.coli HB101, to establish baseline exposure for Directed Evolution | |
| + | We also tested HB101 + pGLO plasmid, to check if GFP has a protective effect. | ||
| + | |||
| + | [[File:Kill Curve results.png|500px]] | ||
| + | |||
| + | ===Demonstrated GFP is NOT an effective UV protectant for E.coli=== | ||
4 log decrease in viable cells after 75min for HB101, 30min for pGLO | 4 log decrease in viable cells after 75min for HB101, 30min for pGLO | ||
| + | |||
If anything, pGLO has a negative effect on UV resistance! | If anything, pGLO has a negative effect on UV resistance! | ||
| − | |||
| − | + | ===Synthesized and transformed A. variabilis shinorine biosynthesis genes=== | |
| − | + | ||
| − | + | ===Submitted one gene (Ava_3856) to Parts Registry=== | |
| − | + | ||
| − | + | ===Demonstrated that we produced UV absorbing compounds=== | |
| − | Synthesized and transformed A. variabilis shinorine biosynthesis genes | + | MAA’s can be extracted with methanol: |
| − | Submitted one gene (Ava_3856) to Parts Registry | + | *<font size=2>Grow 20ml culture overnight in TSB |
| − | Demonstrated that we produced UV absorbing compounds < | + | *Spin down & wash in saline 2x |
| − | </ | + | *Extract in 2ml methanol at 4C overnight |
| − | + | *Pellet at 10,000rpm, collect supernatant | |
| + | *Collect UV absorption spectrum: | ||
| + | **E. coli HB101 (control) | ||
| + | **HB101+Ava_3858-3855 (full shinorine pathway) | ||
| + | **HB101+Ava_3858-3856 (up to mycosporine-glycine only)</font> | ||
| + | |||
| + | [[File:UV Absorption Curve.png|500px]] | ||
| + | |||
| + | Yay - we’re producing UV absorbing compounds! Further analysis will have to wait until we get our HPLC up and running... | ||
Revision as of 13:12, 21 November 2015
Contents
- 1 Accomplishments
- 1.1 Researched UV sources and built UV exposure rig to mimic solar UV
- 1.2 Determined exposure level needed for >4 log decrease in CFU
- 1.3 Demonstrated GFP is NOT an effective UV protectant for E.coli
- 1.4 Synthesized and transformed A. variabilis shinorine biosynthesis genes
- 1.5 Submitted one gene (Ava_3856) to Parts Registry
- 1.6 Demonstrated that we produced UV absorbing compounds
Accomplishments
Researched UV sources and built UV exposure rig to mimic solar UV
- UVA: 320-400nm. “Tanning” wavelengths. Long-term free radical damage
- UVB: 280-320nm. Causes sunburn and direct DNA damage
- UVC: 100-280nm. Rapid skin and retinal damage (e.g.: germicidal UV in BSC)
We want to mimic solar UV: broad-band UVA+UVB, but not UVC! After testing many UV sources, we settled on:
- UVB basking lamp for pet reptiles
- UVA nail curing lamp
Determined exposure level needed for >4 log decrease in CFU
UV kill curve was generated for E.coli HB101, to establish baseline exposure for Directed Evolution
We also tested HB101 + pGLO plasmid, to check if GFP has a protective effect.
Demonstrated GFP is NOT an effective UV protectant for E.coli
4 log decrease in viable cells after 75min for HB101, 30min for pGLO
If anything, pGLO has a negative effect on UV resistance!
Synthesized and transformed A. variabilis shinorine biosynthesis genes
Submitted one gene (Ava_3856) to Parts Registry
Demonstrated that we produced UV absorbing compounds
MAA’s can be extracted with methanol:
- Grow 20ml culture overnight in TSB
- Spin down & wash in saline 2x
- Extract in 2ml methanol at 4C overnight
- Pellet at 10,000rpm, collect supernatant
- Collect UV absorption spectrum:
- E. coli HB101 (control)
- HB101+Ava_3858-3855 (full shinorine pathway)
- HB101+Ava_3858-3856 (up to mycosporine-glycine only)
Yay - we’re producing UV absorbing compounds! Further analysis will have to wait until we get our HPLC up and running...