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Table 1 Brief description of various PDB chains databases and number of protein chains present in respective database

From: BLAST-based structural annotation of protein residues using Protein Data Bank

Sub-Database Software used for assignment Types of information in database Number of protein chains
Unique 70 % 40 %
SecStructure DSSP Regular secondary structure 97216 30642 24211
Accessible surface area
BetaTurn Promotif Beta Turns and types 90331 27763 21075
GammaTurn Gamma turns 72124 22971 16584
BetaBulge Beta bulges in proteins 56186 17753 12944
BetaHairpin Beta hairpins 72420 21623 15477
PsiLoop Psi loops 13351 4382 3151
DNAinteract   DNA binding sites 2123 849 757
RNAinteract RNA binding sites 1437 885 650
LigandInt LPC Ligand interacting residues 51615 17952 13525
MetalInt Metal binding residues 22629 9160 7286