This is a relational database that relates amino acid sequence to corresponding main-chain secondary structure conformation for all proteins available in the Protein Data Bank. The database can be used to retrieve information by querying on any (or combination) of the following fields, i.e., protein name, PDB code, crystal structure resolution, protein sequence length, amino acid sequence, secondary structure conformation or protein secondary structure 'summary'.  Amino acid residues not defined in experimental structure are also indicated.

K.Guruprasad, K.Srikanth and A.V.N.Babu
PSSARD: Protein Sequence-Structure Analysis Relational Database
Int J Biol Macromol. 2005 Sep;36(4):259-62.

Settu Sridhar, A.V.N. Babu, Kunchur Guruprasad
PSSARD (2.0) : A database server for making flexible queries relating aminoacid sequences to main-chain secondary structure conformations for proteins of known three-dimensional structure and certain useful applications.
Int J Biol Macromol. 2007 Jun 1;41(1):109-13.

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