Unfortunately you can not search GDB with your sequence, as GDB does not store
sequence data. GDB entries are linked to the Gene Sequence Database (GSDB)
however, which does store sequence information. If you are interested in
searching against a database with your sequence however, I would suggest a
BLAST search of the GenBank database (http://www.ncbi.nlm.nih.gov/) at NCBI -
which is also a sequence database.