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The objective of this chapter is to provide a detailed purification protocol for the surface-layer (S-layer) glycoproteins of the periodontal pathogen Tannerella forsythia. The procedure involves detergent based solubilization of the bacterial S-layer followed by cesium chloride gradient centrifugation and gel permeation chromatography. The protocol is suitable for the isolation of S-layer glycoproteins from T. forsythia strains with diverse O-glycan structures, and aid in understanding the biochemical basis and the role of prot