1378b: Hemagglutinin Binder Design: Loop Graft
|Name:||1378b: Hemagglutinin Binder Design: Loop Graft|
|Expired:||05/22/2017 - 23:00|
|Description:||Note: This puzzle replaces Puzzle 1378, which was incorrectly calibrated for scoring. Players may load in solutions from Puzzle 1378.
Design a protein that contains the provided hemagglutinin-binding loop! Hemagglutinin is a protein from the influenza virus. It is displayed on the surface of the virus capsid, and allows the virus to recognize and infiltrate human cells. One particular region of the hemagglutinin protein undergoes a dramatic shift during infection; it's thought that stabilizing this region (e.g. with a protein binder) can prevent the normal function of hemagglutinin and stop infection. In fact, during an influenza infection, the immune system can sometimes raise antibody proteins that bind this portion of hemagglutinin to defend against further infection. In this puzzle, we've provided a portion of the hemagglutinin protein, as well as a hemagglutinin-binding loop that is derived from one such antibody protein. We're asking Foldit players to design a new protein that incorporates this same loop!
The backbone and certain residues of the loop are fixed, and the loop is held in place with strong constraints. The starting structure of the design has 53 residues, but players may add residues up to a total of 63. Players may also delete and redistribute residues on either side of the prescribed binding loop. See the puzzle comments for filter details.
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