TABLE 1.

Select microbial exopolysaccharides that contain hexosamine components

Organism	Polymer	Operon	Structure
Aspergillus fumigatus	GAG	NAa	Partially deacetylated α-1,4-linked heteroglycan of Gal and GalNAc
Pseudomonas aeruginosa	Pel	pel	Partially deacetylated 1,4-heteroglycan of GlcNAc and GalNAc
Listeria monocytogenes	EPS	pss	β-1,4-Linked N-acetylmannosamine chain decorated with terminal α-1,6-linked Gal; possibly partially deacetylated
Streptococcus thermophilus	EPS	eps	Tetrasaccharide repeat with 1,3-linked β-Gal, β-Glc, and α-GalNAc with Gal α-1,6 linked to the central Glc
Staphylococcus epidermidisb	PNAG	ica	Partially deacetylated β-1,6-linked GlcNAc
Escherichia colib	PNAG	pga	Partially deacetylated β-1,6-linked GlcNAc

^a NA, not applicable.

^b These species are included as Gram-positive and Gram-negative examples of the range of microorganisms that produce PNAG.