Comments (4)
We don't have a straightforward method to achieve this, so your suggestion, @Yegor13, is accurate. You can simply mask the queryDB and queryDB_ss by substituting the desired letter with an 'X'. Alternatively, you can also convert them to lowercase letters using the --mask-lower-case
option.
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Removing unconserved parts of the structure should be no problem as long as these parts do not break the chain up, in other words, as long as the deletions are not sequence-wise within substructures you are interested in.Removing loops or inserted domains within your structure of interest can reduce sensitivity to target structures that also have loops or inserted domains of similar size at the corresponding positions, because in the alignment to such targets Fooldseek would have to align these loops/domains with gaps, which is costly. So, the rule I suggest is:
- Removing parts of the structure that do not introduce chain breaks is unproblematic.
- Remove parts of the structure within (sequence-wise) your substructure of interest only if you expect the resulting gap costs in the alignment to the targets to be lower than the cost for mismatches when aligning the removed parts.
from foldseek.
Also, it is often better to mask the 3Di sequence instead of trimming the structure by replacing all residues to be masked with X's (X is a state that matches itself with a score of 0). Here the advantage is that you do not alter the structural neighborhood when embedding it into 3Di.
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Hi!
Thanks for the great tool! I have a related question on masking.
How should the above mentioned masking be implemented in practice? Should one first foldseek createdb queryDB and then edit the queryDB_ss file by replacing the irrelevant residues with 'X's? I've tried that, but the results remain the same. I must be missing something. Maybe I should edit the queryDB file containing the amino acid sequences as well by introducing a similar mask?
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Related Issues (20)
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