I have metagenomes samples and I would like to align my reads to all the genetic/genomic information about eukaryotes. But first I would have to build a database comprising this information. Any help or advice would be useful. Thank you!
There are a number of pre compiled databases for BLAST at NCBI (ftp://ftp.ncbi.nlm.nih.gov/blast/db/). If you don’t want to use BLAST for runtime reasons, you can download the FASTA file, instead, and build your own DIAMOND DB from that.
All prokaryotic genomes or NR might be options for you.