GenBank, DNA sequence database
at the National center for biotechnology information.
EMBL,
The EMBL nucleotide sequence database is a comprehensive database of DNA and
RNA sequences collected from the scientific literature, patent applications,
and directly submitted from researchers and sequencing groups.
PIR, Protein sequence
database. The major goal of this database is to provide comprehensive,
non-redundant data uniquely organized by homology and taxonomy
SWISS-PROT,
The SWISS-PROT protein sequence data bank is a database of protein
sequences. It contains high-quality annotation.
SRS, Network
browser for databanks in molecular biology
The
Secondary Structure Server
You can submit a PDB file and get the secondary structure elements
calculated by DSS, and some other useful features of the protein like
the accessible residues.