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Team:StanfordBrownSpelman/Cellulose Cross Linker
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Revision as of 18:54, 17 October 2014
Cellulose Cross-Linker
The goal of this subproject is to create a cellulose cross-linking protein to increase material strength and allow for the modular attachment of biological sensors. This fusion protein contains two distinct cellulose-binding domains[1] on either side of a streptavidin domain. The cellulose-binding domains cross link the cellulose fibers while the streptavidin serves as a binding domain for biological sensors. The interaction between SA (streptavidin) and biotin is one of the strongest non-covalent interactions in nature [2]. Therefore a cell expressing an outer membrane protein that has been biotinylated will bind tightly to this domain. This will allow our UAV to make use of a number of biological sensors.
The goal of this subproject is to create a cellulose cross-linking protein to increase material strength and allow for the modular attachment of biological sensors. This fusion protein contains two distinct cellulose-binding domains[1] on either side of a streptavidin domain. The cellulose-binding domains cross link the cellulose fibers while the streptavidin serves as a binding domain for biological sensors. The interaction between SA (streptavidin) and biotin is one of the strongest non-covalent interactions in nature [2]. Therefore a cell expressing an outer membrane protein that has been biotinylated will bind tightly to this domain. This will allow our UAV to make use of a number of biological sensors.
Approach & Methods
Figure 1. An illustration of cellulose binding domains cross-linking cellulose fibers with a streptavidin domain in the middle. The biosensing cell is expressing a biotinylated AviTag which will bind to the streptavidin .
Our initial approach was to use the cellulose binding domains from C. cellulovorans (part BBa_K863111) on either side of the streptavidin domain (part BBa_K283010) under a T7 promoter in the PSB1A3 backbone.We also included a His-Tag for protein purification. The protein is then expressed in E. coli . Once purified, the cross-linking protein is tested on bacterial cellulose we grew in our lab from the organism G. hansenii. By dotting the protein on the cellulose, the cellulose binding domains will bind to the cellulose fibers and leave the streptavidin domain unbound and ready to bind biotin.
Results
Using the same cellulose binding domain on either side of the streptavidin caused problems that lead us to revaluate our approach. Due to the repetitive nature of the sequence and potential homologous recombination, we had many issues with molecular cloning. We changed our approach to using two different cellulose-binding domains with different sequences. The first cellulose binding domain remained the same, but rather than repeating that same sequence on the other side of the streptavidin, we instead used the cellulose anchoring protein cohesin from the organism C. cellulovorans This allowed us to successfully conduct the molecular cloning.
Figure 2. Sequencing data for the cross-linking protein. The solid green bar indicates a perfect match between our sequence and the expected sequence.The first 1000 base pairs are sequenced in this forward sequence.
