Table 2.

Structural classification of proteins

Dimension	Classification scheme	Databases
1-D	Sequence	UniProt (Wu et al., 2006) and Pfam (Finn et al., 2006)
	Patterns	PRINTS (Attwood et al., 2003) and PROSITE (Hulo et al., 2006)
2-D	Secondary structure fold	SCOP (Casbon and Saqi, 2005) and CATH (Reeves et al., 2006)
3-D	Atomic coordinates	PDB (Berman et al., 2000) and MODBASE (Pieper et al., 2006)
	binding site	Binding MOAD (Hu et al., 2005) and sc-PDB (Kellenberger et al., 2006)

Abbreviations: MOAD, Mother of All Databases; UniProt, The Universal Protein Resource.