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I am wondering if there are any other non-bacterial sources of LPS. To my understanding, lipopolysacchrides (LPS) are components of the outer leaflet of gram-negative bacteria, but are there any other sources of LPS such as fungi?.

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Yes, there is.

Lipopolysacchrides have been found in eukaryotes. The most famous example is green algae from Genus Chlorella.

According to Armstrong et al., (2002):

The lipopolysaccharides (LPS) are ubiquitous components of the outer leaflet of the outer membrane of all gram-negative bacteria and are the principal toxic products of these organisms (1). The membrane anchor of LPS is lipid A, a central phosphodisaccharide unit that is attached to multiple -hydroxy fatty acid chains. LPS also contains the novel sugar, 3-deoxy-D-mannooctulosonic acid (KDO). Although generally believed to be restricted to prokaryotes, specifically the gram-negative eubacteria and the cyanobacteria (2), an LPS-like molecule has recently been reported from a eukaryote, the green alga Chlorella sp., strain NC64A. (emphases mine)

Also, for further discussion on LPS in eukaryotes, please see Histochemical Evidence for Lipopolysaccharide (Endotoxin) in Eukaryotes.

Source:

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