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Sugar molecules such as the one here are coated on the surface of many human pathogens. We are attempting to increase the protein-sugar binding interactions by allowing you to redesign & insert up to 10 residues to form additional hydrogen bonds with the sugar. To encourage this, only GUI scripts are allowed, and sharing has been disabled. After this puzzle expires, the puzzle will be re-posted and LUA scripts and sharing will be allowed. You will be able to load in your solutions from the first puzzle and refine them with scripting and sharing. Please read the new blogpost & puzzle comments for more details.

The fold of this Streptococcal Protein is trapped in a local minimum. Although it looks good, it is incorrect. This is a short 57-residue protein for new players to try out after completing the Introductory Puzzles. The native is shown as a guide on this puzzle, so try using everything you have learned in the Intro levels to match the native fold. For players with fewer than 150 global points.

The fold of this Streptococcal Protein is trapped in a local minimum. Although it looks good, it is incorrect. This is a short 57-residue protein for new players to try out after completing the Introductory Puzzles. The native is shown as a guide on this puzzle, so try using everything you have learned in the Intro levels to match the native fold. For players with fewer than 15 global points.

This puzzle is designed for veteran Foldit players to help new players, and since it was up recently this version of the puzzle is only worth 10 global points.

We are giving you another currently unsolved protein as an extended chain. Use all your skills to fold it up as best as you can. The secondary structure predictions are provided on the starting model, with more details posted in the puzzle comments. This is a repost of Puzzle 679, you will be able to load in your manual saves from the previous version.

This puzzle had incorrect secondary structure predictions and was replaced by 679b: http://fold.it/portal/node/994551

This one is going to be tough! Again the CASP organizers have told us that this "protein is known to form very stable homo-trimers", so we are again giving you the 5 RosettaServer models for R0027 with symmetry. Resetting the puzzle will cycle through the 5 different server predictions (as well as an extended conformation). More details about this CASP target are in the puzzle comments.

We are giving you a single chain of 76 residues to design. Nearing the end of this puzzle, we will post a 76 residue symmetric dimer puzzle where you will be able to load your solution from this monomer into the dimer. Keep that in mind when you are designing your monomer. There are four filters enabled on this puzzle. The ResidueIE filter ensures PHY, TYR, and TRP residues are scoring well. The 1st LayerScore filter ensures the number of residues in the core is between 30% and 70%. The 2nd LayerScore filter ensures the number of residues on the surface is between 30% and 70%. The 3rd LayerScore filter ensures the number of boundary (residues between the core and surface) residues is below 70%. We hope these filters will help you design proteins that the scientists will be able to create in the lab. For players with fewer than 150 global points.

We are giving you a single chain of 76 residues to design. Nearing the end of this puzzle, we will post a 76 residue symmetric dimer puzzle where you will be able to load your solution from this monomer into the dimer. Keep that in mind when you are designing your monomer. There are four filters enabled on this puzzle. The ResidueIE filter ensures PHY, TYR, and TRP residues are scoring well. The 1st LayerScore filter ensures the number of residues in the core is between 30% and 70%. The 2nd LayerScore filter ensures the number of residues on the surface is between 30% and 70%. The 3rd LayerScore filter ensures the number of boundary (residues between the core and surface) residues is below 70%. We hope these filters will help you design proteins that the scientists will be able to create in the lab. For players with fewer than 15 global points.

We are giving you a single chain of 76 residues to design. Nearing the end of this puzzle, we will post a 76 residue symmetric dimer puzzle where you will be able to load your solution from this monomer into the dimer. Keep that in mind when you are designing your monomer. There are four filters enabled on this puzzle. The ResidueIE filter ensures PHY, TYR, and TRP residues are scoring well. The 1st LayerScore filter ensures the number of residues in the core is between 30% and 70%. The 2nd LayerScore filter ensures the number of residues on the surface is between 30% and 70%. The 3rd LayerScore filter ensures the number of boundary (residues between the core and surface) residues is below 70%. We hope these filters will help you design proteins that the scientists will be able to create in the lab.