RCSB PDB: Search
ATC
Biological Process
CARD
CATH
Cellular Component
Disease Ontology
ECOD
Enzyme Classification
Genome Location
MeSH
Molecular Function
mpstruc
OPM
Protein Symmetry
SCOP-e
SCOP2
Source Organism
CATH Browser

The CATH browser is a hierarchical classification of protein domain structures, which clusters proteins at four major levels, Class(C), Architecture(A), Topology(T) and Homologous superfamily (H). Class, derived from secondary structure content, is assigned for more than 90% of protein structures automatically. Architecture, which describes the gross orientation of secondary structures, independent of connectivities, is currently assigned manually. The topology level clusters structures according to their toplogical connections and numbers of secondary structures. The homologous superfamilies cluster proteins with highly similar structures and functions. The assignments of structures to toplogy families and homologous superfamilies are made by sequence and structure comparisons.

Here you can browse or search for PDB structures by CATH IDs or domain/fold names.

Mainly Alpha (1) - [ 49,491 Structures ]
Mainly Beta (2) - [ 48,710 Structures ]
Alpha Beta (3) - [ 92,449 Structures ]
Few Secondary Structures (4) - [ 2,250 Structures ]
Special (6) - [ 1,825 Structures ]
Data from external resource.