puzzle picture
1650b: B7-2 Binder Design: Stabilize the Loop!
Status: Closed


Name: 1650b: B7-2 Binder Design: Stabilize the Loop!
Status: Closed
Created: 03/18/2019
Points: 100
Expired: 03/26/2019 - 23:00
Difficulty: Advanced
Description: Note: Due to some recent server problems, the puzzle expiration will be extended 24 hours. The puzzle will close on March 26 at 23:00 GMT.

Note: This puzzle replaces Puzzle 1650, which was posted with a miscalibrated score function. Players may load in their work from Puzzle 1650.

Design a protein to bind B7-2 and block autoimmune reactions! B7-2 is a signal protein in the immune system, and is important for regulating how the immune system distinguishes foreign particles from “self" cells. In some autoimmune disorders, like rheumatoid arthritis, B7-2 can activate the immune system against the body’s own self cells. We want to design a protein that binds B7-2 and blocks it from activating the immune system. Here we’ve provided the target surface of B7-2, along with a a few loop residues from a known binder of B7-2. We want to see if Foldit players can design a folded protein that contains this loop! The B7-2 surface and the binding loop are frozen in place. Good designs should form a well-folded protein that stabilizes the proline-rich binding loop. The starting structure contains 122 residues, but players may add residues at a cost of 55 points each (maximum 130 residues).
Categories: Design, Overall

Top Groups

1Go Science169,983100
2Anthropic Dreams169,95576
3Marvin's bunch169,88656
4Void Crushers169,88141
5Russian team169,85129

Top Evolvers

Top Soloists

1johnmitch 51 1387  169,992100
2Vinara 51 211  169,96797
3Mike Cassidy 51 273 Void Crushers169,88193
4frood66 51 588 Marvin's bunch169,87290
5phi16 10 41 Anthropic Dreams169,87086

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bkoep's picture
User offline. Last seen 19 hours 56 min ago. Offline
Joined: 11/15/2012
Groups: Foldit Staff
High scoring puzzle!

Apologies for the scoring calibration! This is a result of all of the cutpoints in the structure, which have very bad ideality.

It looks like we overcorrected for this, so solutions in this puzzle will have much higher scores than other puzzles.

grogar7's picture
User offline. Last seen 17 hours 58 min ago. Offline
Joined: 10/03/2011
website not updating scores on this puzzle

Are the devs aware that scores for this puzzle are not updating properly on the Foldit website? My score is at 169546, but website shows 169338. Closing and reopening the puzzle does not help. And the problem seems to be specific to this puzzle, as other puzzles are working as they should!

bkoep's picture
User offline. Last seen 19 hours 56 min ago. Offline
Joined: 11/15/2012
Groups: Foldit Staff
Server problems

Thanks for the feedback! We've been having some server problems, but it's strange that only this puzzle is affected.

The puzzle expiration has been extended 24 hours, to give everyone a chance for their scores to be updated on the website.

Joined: 03/05/2015
Groups: Gargleblasters
Still not scoring correctly.

Thanks for the extension. Likely you already know the scores still aren't updating properly. For example we have an evo with a much higher score in shared solutions that isn't showing on game or site scoreboards. Additionally, that solution crashed three times on load (was going to do it again to capture crash but it finally loaded.)

bkoep's picture
User offline. Last seen 19 hours 56 min ago. Offline
Joined: 11/15/2012
Groups: Foldit Staff
Still not updating?

Have the website scoreboards updated with your high-scoring evo (currently showing 169,792)?

If you have a higher-scoring evo, can you try to share that solution with scientists?

This problem is proving very difficult for us to diagnose (if your high-scoring solutions aren't being sent to the server, we have no way of knowing about them). Your continued feedback is really helpful!

Joined: 06/06/2013
Groups: Gargleblasters
question about objective -- binding the prolines or hiding them

I have a solution that does a better job of binding to the prolines than others. However, it scores better when mutated and losing some of those bonds. I'll share to scientists when the system is fixed, but would like to know what solution we are seeking

bkoep's picture
User offline. Last seen 19 hours 56 min ago. Offline
Joined: 11/15/2012
Groups: Foldit Staff
H-bonds are important!

Good question! The main goal is to design a protein that folds up with the proline-rich loop in the given shape. There could be many ways to do this, but I think good H-bonds will be key.

In particular, each proline has an oxygen atom that can make H-bonds (these backbone oxygens are not visible in the default Cartoon view options, but you can see them in Stick mode). These oxygens should either (1) make hydrogen bonds with the rest of the design, or (2) remain exposed so that they can make H-bonds with the surrounding water. If the oxygens are buried in the design and do not make hydrogen bonds, then the protein will be unlikely to fold.

frood66's picture
User offline. Last seen 16 weeks 19 hours ago. Offline
Joined: 09/20/2011
Groups: Marvin's bunch
this puzzle is still not

this puzzle is still not loading scores correctly

Whatever was fixed was not the prob

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Developed by: UW Center for Game Science, UW Institute for Protein Design, Northeastern University, Vanderbilt University Meiler Lab, UC Davis
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