The DSSP program was designed by Wolfgang Kabsch and Chris Sander to standardize secondary structure assignment. The DSSP database is a database of secondary structure assignments (and much more) for all protein entries in the Protein Data Bank (PDB).

PDB entry code:     

or upload a file in PDB format (.pdb,.ent)




In 1994, a fast algorithm for surface calculation was added to the accessibility module.
The July-1995 version has a slightly changed output format. and several runtime options under unix. Over the years many people have contributed to the maintenance of DSSP. Most noticebly Michael Scharf and Rob Hooft. In 2000 maintenance was taken over by Elmar Krieger.


Dictionary of protein secondary structure: pattern recognition of hydrogen-bonded and geometrical features.
Biopolymers. 1983 Dec;22(12):2577-637.
PMID: 6667333; UI: 84128824.

The DSSP code

H = alpha helix
B = residue in isolated beta-bridge
E = extended strand, participates in beta ladder
G = 3-helix (3/10 helix)
I = 5 helix (pi helix)
T = hydrogen bonded turn
S = bend



Bioinformatics Research Group

School of Computer Sciences

Institute for Studies in Theoretical Physics and Mathematics (IPM)
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Contact S. Shahriar Arab: sh.arab@modares.ac.ir