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Protein Databases

*   UniProt
A comprehensive, high-quality and freely accessible resource of protein sequence and functional information.
*   Entrez Proteins  
This database includes sequence data compiled from a variety of sources
*   Swiss-Prot/TrEMBL
Protein sequence database that uses three key criteria: high level of annotation, minimal redundancy, and high level of integration with other databases
*   The human protein atlas
Shows expression and localization of proteins in a large variety of normal human tissues, cancer cells and cell lines with the aid of immunohistochemistry (IHC) images and immunofluorescence (IF) confocal microscopy images
*   PDB: Protein data bank
An Information Portal to Biological Macromolecular Structures. Archive contains information about experimentally-determined structures of proteins, nucleic acids, and complex assemblies 
*   Entrez Structure tool and Molecular Modelling Database
Resources for macromolecular structures, conserved domains and protein classification, small molecules and their biological activity and biological systems
*   CluSTr
Offers an automatic classification of UniProtKB/Swiss-Prot + UniProtKB/TrEMBL
*   CSA
The Catalytic Site Atlas is a resource of catalytic sites and residues identified in enzymes using structural data
*   HPI
Human Proteomics Initiative (HPI) is an initiative, to annotate all known human sequences according to the quality standards of UniProtKB/Swiss-Prot
*   InterPro
The InterPro database is an integrated documentation resource for protein families, domains and functional sites
*   LGICdb
The Ligand Gated Ion Channel Database
*   PANDIT 
PANDIT is a collection of multiple sequence alignments and phylogenetic trees covering many common protein domains.