With release 6.18.0, we have replaced the mechanism used to map accessions to taxonomic and functional classes.
To process DIAMOND or other alignments against the NCBI-nr database, you now download a single mapping file, either
megan-map-Oct2019.db for the Community Edition, or megan-map-Oct2019-ue.db for the Ultimate Edition, and provide this to MEGAN or Meganizer.
This single file is a SQLite database that contains a table called mappings in which rows represent NCBI-nr accessions (the first one on each header line), and columns represent classifications.
The current classifications are Taxonomy, SEED, EGGNOG and INTERPRO2GO. The mapping file for UE also contains KEGG.
Note that EGGNOG, INTERPRO2GO and KEGG are up-to-date, whereas the MEGAN representation of SEED dates back to 2015. We are currently working on updating our version of SEED.
Please contact me with any questions regarding this new feature.