Team:Heidelberg/Project

From 2014.igem.org

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<div id="abstract-content" class="col-lg-12" >
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<p>Proteins are the functional basis of all biological processes and being able to control and improve their functions through design and engineering is one of the fundamental goals of synthetic biology. While conventional proteins subsist as chains of amino acids with defined beginning and end, nature has found a curious way of enhancing a protein capabilities: circularization.
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<p>Proteins are the functional basis of all biological processes and being able to control and improve their functions through design and engineering is one of the fundamental goals of Synthetic Biology. Protein splicing, a process in which a catalytically active internal polypeptide termed INTEIN excises itself from a precursor protein, has been used by our team to alter the functionalities of proteins in various ways post-translationally.
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In head to tail circularized peptides the terminal amino acids are joined together just like in the rest of the chain, forming a circular structure. Such peptides have been discovered in all kingdoms of life during the past years and they are unified by an extreme stability towards high temperatures, proteases and changes in pH.</p>
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<br></br>
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We have developed a comprehensive <a href="/Team:Heidelberg/Project/Toolbox">toolbox</a> comprising five sets of <a href="/Team:Heidelberg/Parts">standardized parts</a> that provide standard mechanisms for specific modifications of proteins:
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<p>Given these attractive features of circular proteins, methods to circularize otherwise linear proteins have been devised, one of which is based on autocatalytic protein domains called inteins.  
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(1) A <a href="/Team:Heidelberg/Project/Toolbox#Purification">purification</a> standard to facilitate purification of recombinant proteins.
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We have applied the principle of circular peptides to synthetic biology by introducing a BioBrick-based, standardised method for circularizing any protein using inteins.</p>
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(2) A construct that allows for post-translational <a href="/Team:Heidelberg/Project/Toolbox#Fusion_and_Tagging">fusion</a> of protein domains to produce synthetic proteins
 +
(3) A standard that allows for switching proteins <a href="/Team:Heidelberg/Project/Toolbox#On_Off">on and off</a>.
 +
(4) One to <a href="/Team:Heidelberg/Project/Toolbox#Oligomerization">oligomerize</a> protein monomers.
 +
And (5) perhaps the most intriguing standard construct of this toolbox that was built to produce heat stable proteins, which can be achieved by <a href="/Team:Heidelberg/Toolbox/Circularization">circularization</a>.
 +
In order to offer a comfortable way to apply any of the above mechanisms to a protein and a biological system we designed a <a href="/Team:Heidelberg/Toolbox_Guide">toolbox guide</a> that provides step by step instructions for cloning based on the intein standard parts described in our <a href="/Team:Heidelberg/Parts/RFC">RFC</a>.
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<br></br>
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Besides achieving a solid and broad foundation for future intein applications in synthetic biology, we aimed on deeply exploring one of the functions provided in our toolbox: circularization of proteins. In head to tail circularized peptides the terminal amino acids are joined together just like in the rest of the chain, forming a circular structure. Such peptides have been discovered in all kingdoms of life during the past years and they are unified by an extreme stability towards high temperatures, proteases and changes in pH.
 +
Synthetically connecting a protein's termini without disrupting its 3D structure and function is, however, a delicate task which has so far been accomplished only for relatively small proteins whose ends lie close to each other. With <a href="/Team:Heidelberg/Modeling/Linker_Modeling">CRAUT</a> we have brought into existence a powerful open-source software to predict an optimal rigid linker to support stabilizing circularization of a protein preserving its 3D structure and function.
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In order to provide us - and future iGEM teams - with a standard way to conduct the needed consuming modelling calculations we deployed a distributed computing platform we call <a href="/Team:Heidelberg/Human_Practice/igemathome">iGEM@home</a> that we also developed into a powerful science communication platform.
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As an evaluation of the linker software we screened linkers generated by the software by circularizing <a href="/Team:Heidelberg/Project/Linker_Screening">Lambda Lysozyme</a> and experimentally evaluating the heat stability of the products.
 +
<br></br>
 +
Based on the calibrated software, we constructed linkers to circularize the 871 a.a. long  <a href="/Team:Heidelberg/Project/PCR2.0">methyltransferase Dnmt1</a> and provide data suggesting that circular DNMT1 is more functional than its linear counterpart at high temperatures. Our results have strong implications for developing an innovative PCR-based technique that could revolutionize epigenetic studies and cancer research by maintaining the methylation pattern of the DNA template during amplification.
 +
Besides a protein with potential medical (lysozyme) and one with biotechnological (DNMT1) applications we chose the hemicellulose  <a href="/Team:Heidelberg/Project/Xylanase">Xylanase</a> as a third target for circularization, that has applications in large scale production in paper and food industry.
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<br></br>
 +
As an additional feature we decided to add another dimension to intein mediated modifications of our toolbox by developing optically induced small inteins that are photocaged by an <a href=”/Team:Heidelberg/Project/LOV”>As LOV2</a> domain.  While sterically hampering intein dimerization in the dark, the LOV domain opens up when exposed to blue light, releasing the intein to proceed the splicing reaction.
 +
<br></br>
 +
Setting new standards also for wiki documentation we created and developed a new way of documenting collaborative lab work by bringing the  <a href="/Team:Heidelberg/Notebook">MidnightDoc</a> to life.
 +
<br></br>
 +
Finally we complemented our already elaborate <a href="/Team:Heidelberg/Human_Practice">Human Practice</a> activities with two events on education and religion, philosophy and ethics in synthetic biology.
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<p>Synthetically connecting a protein&apos;s termini without disrupting its 3D structure and function is, however, a delicate task which has so far been accomplished only for relatively small proteins whose ends lie close to each other. We therefore saw the need for a comprehensive software that predicts the process of circularization. With CRAUT we have brought into existence a powerful open-source software to predict an optimal linker to support circularization of a protein preserving its 3D structure and function.<br />
 
-
Due to our lack of calculating power we deployed this software on the distributed computing platform BOINC in an initiative we call iGEM@home.</p>
 
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<p>Based on our software predictions, we constructed linkers to circularize the 871 a.a. long methyltransferase Dnmt1 and provide data suggesting that circular DNMT1 is more functional than its linear counterpart at high temperatures. Our results have strong implications for developing an innovative PCR-based technique that could revolutionize epigenetic studies and cancer research by maintaining the methylation pattern of the DNA template during amplification.</p>
 
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<p>Eventually, inteins can be used to post-translationally modify any protein in a multitude of ways going far beyond circularization. We therefore created a BioBrick-based intein toolbox to allow for easy and standardised protein manipulation. We think that our toolbox will be invaluable to many systems biology projects aimed at dissecting or re-engineering the function of cellular networks.</p>
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<img style="height:60px; display:inline-block;" src="/wiki/images/d/df/Heidelberg_Lysozyme.png" />
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</a>
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<a href="/Team:Heidelberg/Software/Linker_Software" class="block box" style="bottom:0; left:-20px; position:absolute;" style="width:170px;">
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<a href="/Team:Heidelberg/Software/Linker_Software" class="block box" style="bottom:0; left:-20px; position:absolute;width:170px;">
<img src="/wiki/images/4/42/Craut_small.png" alt="..." style="width:100%;"/>
<img src="/wiki/images/4/42/Craut_small.png" alt="..." style="width:100%;"/>
<span class="red-text" >circularize</span> it<br>
<span class="red-text" >circularize</span> it<br>
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<div id="onoff-box" class="descr-box"><a href="https://2014.igem.org/Team:Heidelberg/Project/Toolbox#On_Off"><img src="/wiki/images/c/c2/Heidelberg_Toolbox_On-Off.png" id="onoff-icon" class="toolbox-icon toolbox-icon-scale"/></a><h3>ON/OFF</h3><div><span>Activate or deactivate Proteins using Inteins</span></div></div>
<div id="onoff-box" class="descr-box"><a href="https://2014.igem.org/Team:Heidelberg/Project/Toolbox#On_Off"><img src="/wiki/images/c/c2/Heidelberg_Toolbox_On-Off.png" id="onoff-icon" class="toolbox-icon toolbox-icon-scale"/></a><h3>ON/OFF</h3><div><span>Activate or deactivate Proteins using Inteins</span></div></div>
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<div id="purification-box" class="descr-box"><a href="https://2014.igem.org/Team:Heidelberg/Project/Toolbox#Purification"><img src="/wiki/images/0/04/Heidelberg_Toolbox_Purification.png" id="purification-icon" class="toolbox-icon toolbox-icon-scale"/></a><div><h3>PURIFICATION</h3></div><span>Placeholder</span></div>
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<div id="purification-box" class="descr-box"><a href="https://2014.igem.org/Team:Heidelberg/Project/Toolbox#Purification"><img src="/wiki/images/0/04/Heidelberg_Toolbox_Purification.png" id="purification-icon" class="toolbox-icon toolbox-icon-scale"/></a><div><h3>PURIFICATION</h3></div><span>Purify your protein using inteins.</span></div>
<div id="toolbox-text">
<div id="toolbox-text">
the intein<br>
the intein<br>
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           <p style="font-weight:light; font-size:25px">Establishing protein circularization as a NEW BIOENGINEERING TOOL in synthetic biology.</p>  
           <p style="font-weight:light; font-size:25px">Establishing protein circularization as a NEW BIOENGINEERING TOOL in synthetic biology.</p>  
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           <p style="font-weight:light; font-size:25px">Providing a NEW COMPREHENSIVE TOOLBOX based on inteins for modifying proteins post-translationally.</p>  
           <p style="font-weight:light; font-size:25px">Providing a NEW COMPREHENSIVE TOOLBOX based on inteins for modifying proteins post-translationally.</p>  
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           <p style="font-weight:light; font-size:25px">Development of a NEW STANDARD to make the use of inteins easy and modular.</p>  
           <p style="font-weight:light; font-size:25px">Development of a NEW STANDARD to make the use of inteins easy and modular.</p>  
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           <p style="font-weight:light; font-size:25px">Showing that the toolbox WORKS: proteins are circularized and split fluorescent proteins are reconstituted.</p>  
           <p style="font-weight:light; font-size:25px">Showing that the toolbox WORKS: proteins are circularized and split fluorescent proteins are reconstituted.</p>  
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           <p style="font-weight:light; font-size:25px">Creating circular DNMT1 and showing that it is ACTIVE.</p>  
           <p style="font-weight:light; font-size:25px">Creating circular DNMT1 and showing that it is ACTIVE.</p>  
           <p style="margin-left:50px; font-size:20px">For the first time achieving the circularization of a large protein!</p>
           <p style="margin-left:50px; font-size:20px">For the first time achieving the circularization of a large protein!</p>
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<p style="margin-left:50px; font-size:20px">Circularizing LYSOZYME and XYLANASE, two very important proteins for
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research and industry!</p>
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           <p style="font-weight:light; font-size:25px">Developing a NEW SOFTWARE to calculate customized linkers to circularize proteins.</p>  
           <p style="font-weight:light; font-size:25px">Developing a NEW SOFTWARE to calculate customized linkers to circularize proteins.</p>  
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           <p style="font-weight:light; font-size:25px">Establish a distributed computing platform called <a href="https://2014.igem.org/Team:Heidelberg/Software/igemathome">iGEM@home</a>.</p>  
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           <p style="font-weight:light; font-size:25px"> Establishing a distributed computing platform called <a href="https://2014.igem.org/Team:Heidelberg/Software/igemathome">iGEM@home</a>.</p>  
           <p style="margin-left:50px; font-size:20px">Using this platform as an entirely new way to reach out to the world with synthetic biology concepts!</p>
           <p style="margin-left:50px; font-size:20px">Using this platform as an entirely new way to reach out to the world with synthetic biology concepts!</p>
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           <p style="font-weight:light; font-size:25px">Creating a NEW SOFTWARE to display the notebook on the wiki.</p>  
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Latest revision as of 08:22, 5 February 2015

 Project overview

Proteins are the functional basis of all biological processes and being able to control and improve their functions through design and engineering is one of the fundamental goals of Synthetic Biology. Protein splicing, a process in which a catalytically active internal polypeptide termed INTEIN excises itself from a precursor protein, has been used by our team to alter the functionalities of proteins in various ways post-translationally.

We have developed a comprehensive toolbox comprising five sets of standardized parts that provide standard mechanisms for specific modifications of proteins: (1) A purification standard to facilitate purification of recombinant proteins. (2) A construct that allows for post-translational fusion of protein domains to produce synthetic proteins (3) A standard that allows for switching proteins on and off. (4) One to oligomerize protein monomers. And (5) perhaps the most intriguing standard construct of this toolbox that was built to produce heat stable proteins, which can be achieved by circularization. In order to offer a comfortable way to apply any of the above mechanisms to a protein and a biological system we designed a toolbox guide that provides step by step instructions for cloning based on the intein standard parts described in our RFC.

Besides achieving a solid and broad foundation for future intein applications in synthetic biology, we aimed on deeply exploring one of the functions provided in our toolbox: circularization of proteins. In head to tail circularized peptides the terminal amino acids are joined together just like in the rest of the chain, forming a circular structure. Such peptides have been discovered in all kingdoms of life during the past years and they are unified by an extreme stability towards high temperatures, proteases and changes in pH. Synthetically connecting a protein's termini without disrupting its 3D structure and function is, however, a delicate task which has so far been accomplished only for relatively small proteins whose ends lie close to each other. With CRAUT we have brought into existence a powerful open-source software to predict an optimal rigid linker to support stabilizing circularization of a protein preserving its 3D structure and function. In order to provide us - and future iGEM teams - with a standard way to conduct the needed consuming modelling calculations we deployed a distributed computing platform we call iGEM@home that we also developed into a powerful science communication platform. As an evaluation of the linker software we screened linkers generated by the software by circularizing Lambda Lysozyme and experimentally evaluating the heat stability of the products.

Based on the calibrated software, we constructed linkers to circularize the 871 a.a. long methyltransferase Dnmt1 and provide data suggesting that circular DNMT1 is more functional than its linear counterpart at high temperatures. Our results have strong implications for developing an innovative PCR-based technique that could revolutionize epigenetic studies and cancer research by maintaining the methylation pattern of the DNA template during amplification. Besides a protein with potential medical (lysozyme) and one with biotechnological (DNMT1) applications we chose the hemicellulose Xylanase as a third target for circularization, that has applications in large scale production in paper and food industry.

As an additional feature we decided to add another dimension to intein mediated modifications of our toolbox by developing optically induced small inteins that are photocaged by an As LOV2 domain. While sterically hampering intein dimerization in the dark, the LOV domain opens up when exposed to blue light, releasing the intein to proceed the splicing reaction.

Setting new standards also for wiki documentation we created and developed a new way of documenting collaborative lab work by bringing the MidnightDoc to life.

Finally we complemented our already elaborate Human Practice activities with two events on education and religion, philosophy and ethics in synthetic biology.

CIRCULARIZATION

Create a linker with our crowd computing software and make your protein heat stable

OLIGOMERIZATION

Fuse multiple Proteins or Domains using Inteins

FUSION

Fuse two Proteins or Domains together using Inteins

ON/OFF

Activate or deactivate Proteins using Inteins

PURIFICATION

Purify your protein using inteins.
the intein
toolbox
 inducible via
light induction
Heat-stable
circular
DNA-
Methyltransferase

PCR 2.0
modify your protein
using the toolbox guide

Establishing protein circularization as a NEW BIOENGINEERING TOOL in synthetic biology.

Contributing to iGEM with a new foundational advance!

Providing a NEW COMPREHENSIVE TOOLBOX based on inteins for modifying proteins post-translationally.

Sending 67 Biobricks to Registry of Biological parts!

Development of a NEW STANDARD to make the use of inteins easy and modular.

Establishment of a new RFC!

Showing that the toolbox WORKS: proteins are circularized and split fluorescent proteins are reconstituted.

Making Gels, Western Blots, Fluorescence-based Assays and Mass spectrometry to prove it!

Creating circular DNMT1 and showing that it is ACTIVE.

For the first time achieving the circularization of a large protein!

Circularizing LYSOZYME and XYLANASE, two very important proteins for research and industry!

Developing a NEW SOFTWARE to calculate customized linkers to circularize proteins.

Making CRAUT open-source for the scientific community.

Establishing a distributed computing platform called iGEM@home.

Using this platform as an entirely new way to reach out to the world with synthetic biology concepts!

Creating a NEW SOFTWARE to display the notebook on the wiki.

Distributing MidNightDOC to the iGEM community to help future teams organize their protocols!

Bronze


  • Please find a comprehensive compilation of sponsors, partners and scientific contributors on our acknowledgements page.

  • We also encourage you to take notice of the projects “Photo-intein” and “Mito-intein” by iGEM team Queens from Canada that may supply you with complementary information and tools for the use of inteins in synthetic biology!

  • A list of links to more than 60 parts in the registry submitted by our team (being or not being part of the new intein toolbox) can be found here.

Silver


  • We experimentally validated that our biobricks BBa_K1362000, BBa_K1362100 and BBa_K1362101 work as expected. For more information on the parts please visit the corresponding main pages in the parts registry or explore their involvement in our subprojects.

  • Religious perceptions of synthetic biology have been part of several surveys during the past ten years of iGEM and Human Practices projects. Since religious groups cover the majority of worlds population, deliver moral values and wield power at the same time, we decided to dedicate a whole event on the topic of religion, philosophy and ethics regarding synthetic biology. Please find an evaluation of our event on the corresponding Human Practices pages.

Gold

  • We improved the function of the already existing biobrick part BBa_K1175005 by optimizing and resubmitting the corresponding sequence of B. subtilis xylanase to the registry (Part: BBa_K1362020). In addition, we submitted a new part for expression of circularized xylanase (BBa_K1362022) that might be used in future applications with need for refined enzyme stability.

  • Despite the fact that we focused on building a set of powerful soft- and wetware tools to help future iGEM-teams developing and realizing projects in synthetic biology, we are happy to announce that we were also able to help out several team during the course of our project, aspecially with sending our expression vectors. Read more abou in in our Collaborations.

  • In the style of of the new iGEM community labs track that involves science amateurs “beyond the accolades of scientific publishing and economic reward”, we sought for a new way to involve laymen in actual science and build a strong community of well informed supporters and communicators of synthetic biology at the same time. Now we proudly present the crowd sourcing and communication platform iGEM@home.