Team:UCSF/ProjectOverview

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<img align="left" style="margin-bottom:0px; width: 755px; margin-top:-3px; padding:0;" src="http://i54.tinypic.com/1z3tml1.png" usemap="#headermap" alt="Queen's">
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<h3red>Background</h3red> <p>
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<regulartext>Agglutination, a type of aggregation specific to mating in Sacchromyces cerevisiae, occurs with two surface proteins: alpha-agglutinin and a-agglutinin. Alpha-agglutinin is produced only by alpha-cells and a-agglutinin is produced only by a-cells. During mating, each cell releases pheromones and accepts pheromones secreted by other cells. The alpha-cells respond to a-cell pheromones while the a-cells respond to alpha pheromones. When each cell has received enough of the correct molecule, it will begin to make its agglutinin. In close proximity, the alpha-agglutinin and the a-agglutinin will aggregate, causing cell-cell adhesion. The two yeast cells will come close enough and eventually fuse into one diploid cell. <p> </regulartext>
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<regulartext> We took a closer look into the protein, a-agglutinin, and found that it was composed of two subunits: Aga1p and Aga2p. The Aga1 and Aga2 genes lie under a promoter that switches on when the cell has received pheromones from a mate. When the proteins are expressed, Aga1p is attached to the cell surface by a GPI anchor and is also connected to Aga2p through disulfide bonds.  <p> </regulartext>
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<regulartext>For our project, we decided to utilize the a-agglutinin half of the aggregation display system to form artificial biofilms. By placing sequences of strong adhesive proteins behind the GPI anchor-Aga1-Aga2 gene and overexpressing them, we were able to create yeast cells that could adhere to different surfaces and even other yeast cells. A couple genes we used to attach to the end of the Aga1p-Aga2p complex were mice cadherins, proteins that mussels used to stick to rocks, and proteins used by other yeast species to initiate biofilm formation.  <p></regulartext>
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<regulartext1> <b>Interaction of Aga1 with Aga2-fused protein of interest leads to Yeast Cell Surface Display</b>  </regulartext1> </div>
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<regulartext1> <b>Interaction of Two Cells via Yeast Cell Surface Display</b>  </regulartext1> </div>
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Latest revision as of 22:58, 27 September 2011

introduction
the team
our project
parts
requisites
attributions
extras

Queen's

Background

Agglutination, a type of aggregation specific to mating in Sacchromyces cerevisiae, occurs with two surface proteins: alpha-agglutinin and a-agglutinin. Alpha-agglutinin is produced only by alpha-cells and a-agglutinin is produced only by a-cells. During mating, each cell releases pheromones and accepts pheromones secreted by other cells. The alpha-cells respond to a-cell pheromones while the a-cells respond to alpha pheromones. When each cell has received enough of the correct molecule, it will begin to make its agglutinin. In close proximity, the alpha-agglutinin and the a-agglutinin will aggregate, causing cell-cell adhesion. The two yeast cells will come close enough and eventually fuse into one diploid cell.

We took a closer look into the protein, a-agglutinin, and found that it was composed of two subunits: Aga1p and Aga2p. The Aga1 and Aga2 genes lie under a promoter that switches on when the cell has received pheromones from a mate. When the proteins are expressed, Aga1p is attached to the cell surface by a GPI anchor and is also connected to Aga2p through disulfide bonds.

For our project, we decided to utilize the a-agglutinin half of the aggregation display system to form artificial biofilms. By placing sequences of strong adhesive proteins behind the GPI anchor-Aga1-Aga2 gene and overexpressing them, we were able to create yeast cells that could adhere to different surfaces and even other yeast cells. A couple genes we used to attach to the end of the Aga1p-Aga2p complex were mice cadherins, proteins that mussels used to stick to rocks, and proteins used by other yeast species to initiate biofilm formation.




Interaction of Aga1 with Aga2-fused protein of interest leads to Yeast Cell Surface Display









Interaction of Two Cells via Yeast Cell Surface Display

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