The CATH database is a free, publicly available online resource that provides information on the evolutionary relationships of protein domains.(95 million protein domains classified into 6,119 superfamilies)
ENZYME is a repository of information relative to the nomenclature of enzymes.And it describes each type of characterized enzyme for which an EC (Enzyme Commission) number has been provided
The Kabat database includes nucleotide sequences, sequences of T cell receptors for antigens (TCR), major histocompatibility complex (MHC) class I and II molecules, and other proteins of immunological interest.
Protein model portal (PMP) gives access to various models computed by comparative modeling methods provided by different partner sites, and provides access to various interactive services for model building, and quality assessment.
PROSITE consists of documentation entries describing protein domains, families and functional sites as well as associated patterns and profiles to identify them.
Protein Data Bank builds upon archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease.
SCOP2 is a successor of Structural classification of proteins (SCOP). the main focus of SCOP2 is on proteins that are structurally characterized and deposited in the PDB.