Team:LMU-Munich/Germination Stop

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== '''Germination'''STOP ==
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[[File:GerminationSTOP.png|100px|right|link=]]
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The goal of this project is to remove the germination capability, while keeping the necessary structural functions of the spores intact.
 
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== '''Germination'''STOP ==
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<p align="justify">The goal of this module was to yield [https://2012.igem.org/Team:LMU-Munich/Spore_Coat_Proteins '''Sporo'''beads] which are safe (unable to germinate) and consistently functional (maintain their spore shape and structure throughout time). To achieve this, we sought to remove the germination capability of our spores, while keeping their necessary structural functions intact.</p>
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There are two approaches to achive this:
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[[File:GerminationSTOP_cycleIIii.jpg|620px|center]]
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* [[Team:LMU-Munich/Germination_Stop#Gene_Knockouts|Knock out]] genes that are involved in germination.
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[[File:NEXT.png|right|80px|link=Team:LMU-Munich/safetytour]] [[File:BACK.png|left|80px|link=Team:LMU-Munich/Bacillus_BioBricks]]
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* [[Team:LMU-Munich/Germination_Stop#Suicideswitch|'''Suicide'''switch]]: Toxin production if germination knockout fails and spore manages to germinate.
 
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==Gene Knockouts==
 
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Based on the work of [http://www.ncbi.nlm.nih.gov/pubmed/19554258 J. Kim and W. Schumann (2009)] and [http://www.ncbi.nlm.nih.gov/pubmed/11466293 B. Setlow et al (2001)], we decided to knock out genes ''cwlJ'', ''sleB'', ''cwlB'', ''gerD'', and ''cwlD''. The genes ''cwlJ'' and ''sleB'' code for lytic enzymes which are active in the process of germination. In the work of [http://www.ncbi.nlm.nih.gov/pubmed/11466293 B. Setlow et al (2001)], when ''cwlJ'' and ''sleB'' were knocked out together, germination frequency was reduced by 5 orders of magnitude. [http://www.ncbi.nlm.nih.gov/pubmed/19554258 J. Kim and W. Schumann (2009)] report a similar reduction in germination when ''gerD'' and ''cwlB'' are knocked out together, and a reduction in germination ability when the gene ''cwlD'' is knocked out. When all five of these genes are knocked out, we hope to yield a ''B. subtilis'' strain which produces spores completely incapable of germination.
 
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Two methods are being employed to knock out germination: resistance cassette (RC) knockouts and clean deletions. Single RC knockouts were created, and have then been combined to create multiple knockouts.
 
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This will be checked with germination assays.
 
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Further, we will investigate the possibility of using a redundant toxin system to immediately kill off any spores which somehow germinate.
 
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==Gene Knockouts==
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|<p align="justify">We picked important germination genes and knocked them out. Subsequently we combined the single mutants into quadruple mutants and successfully prevented germination.</p>
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|[[File:LMU Germination STop plate.png|200px|right|link=Team:LMU-Munich/Germination_Stop/Knockout]]
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! colspan="2" |[[File:LMU Arrow purple.png|40px|link=Team:LMU-Munich/Germination_Stop/Knockout]]
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=='''Suicide'''switch==
=='''Suicide'''switch==
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{| "width=100%" style="text-align:center;" style="align:right"|
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[[File:LMU SuicideSwitch grafik.png|700px|thumb|center]]
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|<p align="justify">In case of germination gene knockout failure, we invented the suicide switch. If spores still germinate, the production of a toxin leads to immediate cell death.</p>  
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|[[File:LMU SuicideSwitch grafik.png|200px|right|link=Team:LMU-Munich/Germination_Stop/SuicideSwitch]]
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'''Project Navigation'''
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! colspan="2" |[[File:LMU Arrow purple.png|40px|link=Team:LMU-Munich/Germination_Stop/SuicideSwitch]]
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<a href="https://2012.igem.org/Team:LMU-Munich/Bacillus_Introduction">
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<a href="https://2012.igem.org/Team:LMU-Munich/Bacillus_Introduction"><font size="1" face="verdana">Bacillus<BR>Intro</font></a>
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====Project Navigation====
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|[[File:BacillusBioBrickBox.png|100px|link=Team:LMU-Munich/Bacillus_BioBricks]]
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|[[File:SporeCoat.png|100px|link=Team:LMU-Munich/Spore_Coat_Proteins]]
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<img src="https://static.igem.org/mediawiki/2012/7/78/BacillusBioBrickBox.png" height=70"/>
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|[[Team:LMU-Munich/Bacillus_Introduction|<font size="2">'''''Bacillus'''''<BR>Intro</font>]]
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|[[Team:LMU-Munich/Bacillus_BioBricks|<font size="2" face="verdana">'''''Bacillus'''''<BR>'''B'''io'''B'''rick'''B'''ox</font>]]
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|[[Team:LMU-Munich/Spore_Coat_Proteins|<font size="2" face="verdana">'''Sporo'''beads</font>]]
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<a href="https://2012.igem.org/Team:LMU-Munich/Bacillus_BioBricks"><font size="1" face="verdana">Bacillus<BR>BioBrickBOX</font></a>
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|[[Team:LMU-Munich/Germination_Stop|<font size="2" face="verdana">'''Germination'''<BR>STOP</font>]]
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<a href="https://2012.igem.org/Team:LMU-Munich/Spore_Coat_Proteins"><font size="1" face="verdana">SporeCoat<BR>FusionProteins</font></a>
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<a href="https://2012.igem.org/Team:LMU-Munich/Germination_Stop"><font size="1" face="verdana">Germination<BR>STOP</font></a>
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Latest revision as of 16:42, 26 October 2012

iGEM Ludwig-Maximilians-Universität München Beadzillus

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The LMU-Munich team is exuberantly happy about the great success at the World Championship Jamboree in Boston. Our project Beadzillus finished 4th and won the prize for the "Best Wiki" (with Slovenia) and "Best New Application Project".

IGEM HQ LMU prize.jpg

[ more news ]

Sporenfreunde

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