Questions tagged [pssm]

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Is there a method/web server to generate Position-specific scoring matrix (PSSM) for nucleotide sequences (DNA/RNA)?

Just like, PSI-BLAST is avaialble to generate a PSSM matrix for peptides, is there a web server where we can generate PSSM for DNA/RNA? I want to find homologous sequences to a given RNA sequence.
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After running PSI-BLAST one obtains a profile matrix with this header: A R N D C Q E G H I L K M F P S T W Y V How does PSI-...
2 votes
1 answer

Is it possible to reconstruct an MSA with PSSM?

I am thinking of reconstructing an multiple sequence alignment (MSA) of protein sequences from a position-Specific Scoring Matrices (PSSM). Is it possible? I suppose co-evolution information is lost ...
1 vote
1 answer

Downloading PSSM file from NCBI PSI-Blast results after the UI update

It used to be easy to download off a results page of a PSI-Blast from NCBI the PSSM (scorematrix). Now I cannot seem to find an asn file that is a scorematrix —<...
2 votes
1 answer

How to deal with wildcards (N) in sequence logos

This is an open question that came to my mind recently, though it might be that it is not a common use case. The purpose is to find common patterns in a collection of sequences by representing the ...
1 vote
1 answer

How to interpret a PSSM matrix from PSI-Blast - what do the numbers represent?

PSI-Blast on a sequence returns a PSSM matrix file containing two matrices, one to the left, one the the right, for all amino acids: ...
1 vote
1 answer

How to get PSSM of protein by protein sequence with python? [closed]

I didn't find way that convert protein sequences in FASTA to PSSM by python, and how to write program in python to find PSSM for our data set ? Maybe better to question how to find PSSM from NCBI ...
4 votes
1 answer

What does an output of -I for all amino acids mean in a psi-blast pssm matrix file?

I have run psi-blast using the NR database, remotely, with one iteration, for several sequences to calculate an evolutionary profile (PSSM) for each of those sequences. However, many of the PSSM ...