I am new to metagenomics. I downloaded a 16s rRNA data from sra and generated OTU table using USEARCH. How to assign Taxonomic classification to OTU table. I tried with the following command:
./usearch10.0.240_i86linux32 -sintax otu_cluster.fa -db 2_rdp_16s.udb -tabbedout read.sintax -strand both -sintax_cutoff 0.8
But I got fatal error. .udb magic4 0x55545838 should be 0x55444234
How can I get Taxonomic classification to OTU table