Dockerin is a protein domain found in the cellulosome cellular structure of anaerobic bacteria.

The dockerin's binding partner is the cohesin domain, located on the scaffoldin protein.

This interaction between the dockerin domains of the enzyme constituents of the cellulosome and the cohesin domains of the scaffoldin protein is essential to the construction of the cellulosome complex.

[1] The Dockerin domain has two in-tandem repeats of a non-EF hand calcium binding motif.

[2] The three-dimensional structure of dockerin has been determined in solution,[3] as well as in complex with Cohesin.