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Recipe: Loop rebuild 5.2
Created by spvincent 48 31
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Name: Loop rebuild 5.2
ID: 48734
Created on: Sat, 03/29/2014 - 20:07
Updated on: Sat, 03/29/2014 - 20:07
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spvincent's picture
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Joined: 12/07/2007
Groups: Contenders
Changes since 5.0 LR 5.0

Changes since 5.0

LR 5.0 didn't work terrible well with the new wiggle scheme: tended to get stuck too easily. This should hopefully be improved here (tested on Auto WP)

1) Doesn't get stuck so easily
2) Removed superfluous sliders: the parameters they control are now constants and can of course be changed if desired.
3) Default number of rebuilds reduced as FoldIt's Rebuild function seems to do a better job.

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Given a number of rebuilds, which is the best one to use? Not necessarily the best-scoring one, or even the best-scoring one at low CI (see http://proteinoftheday.wordpress.com ), or the best -scoring after shake, but probably the best-scoring after shake and wiggle, which is what's going on here. Since Shake and wiggle are computationally expensive, considerable effort is made to work only with the relevant sub-section of the protein.

Best used at high WP.

Algorithm outline


For each section to rebuild
   For each rebuild (defined by N Rebuilds)
      Rebuild once
      Set selection to that defined by Inner sphere
      Shake
      Wiggle for a fixed number of iterations
   end
   
   For each pose corresponding to the two best scores above
      Set selection to that defined by Outer sphere
      Wiggle adaptively in the NC-approved way
   end

   Take the best pose from the two above
   Set selection to that defined by Outer sphere
   Shake (or Mutate if a design puzzle and that option chosen)
   Wiggle again if the Shake or Mutate gained anything.

   If we've gained an overall improvement
      Shake at low CI
      Wiggle at normal CI
      Record overall improvement
  end

end

Dialog settings

Rebuild Length

How big a section to rebuild. Values from 4 to 6 are typically most useful.

Min residue, Max residue

The range to be rebuilt: by default the entire protein. These values can be usefully changed to whatever region of the protein you're working on: it's often desirable to set them to the start and end of a loop you're working on.

Loops only

When set, only loops will be rebuilt, although a single non-loop residue is allowed, This effectively means that the end residue of a helix or sheet will be treated as a loop for rebuild purposes.

Convert to Loops

Meaningful if and only if Loops nnly above is unchecked. If checked, non-loops will be converted to loops before rebuilding: if not the secondary structure will be maintained.

So for example, if you had a helix from 35-40 and you wished to rebuild it as a helix with, say , a loop spacer 2 residues wide on either end, suitable settings would be:

Rebuild Length 10
Min residue 33
Max residue 42
Loops only unchecked
Convert to loops unchecked

Number of rebuilds

How many rebuilds to attempt. The default is a bit of a compromise: too small a value means that not enough poses will be created: too many and there's a high probability of ending up working on a pose which is extremely similar to the starting structure.

Mutate not shake

This checkbox will appear if and only if the puzzle contains mutable residues. If set, the side chain wiggle in the algorithm will be replaced by a mutate.

Check conditions met:

If set, check that conditions are met before accepting any improvement. For puzzles with RMSD conditions, etc.

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Developed by: UW Center for Game Science, UW Institute for Protein Design, Northeastern University, Vanderbilt University Meiler Lab, UC Davis
Supported by: DARPA, NSF, NIH, HHMI, Amazon, Microsoft, Adobe, RosettaCommons