The Lipopolysaccharide reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Lipopolysaccharide

In biochemistry, lipopolysaccharide (LPS) is a major suprastructure of gram-negative bacteria which contributes greatly to the structural integrity of the bacteria, and protects them from host immune defenses.

It comprises three parts: polysaccharide side chains, core polysaccharides and lipid A. Lipid A contains unusual fatty acids (e.g. hydroxy-mysteric acids). Core polysaccharide contains unusual sugars (e.g. KDO, keto-deoxyoctulonate and heptulose). The polysaccharide side chain is referred as the O-antigen of the bacteria.

LPS is also referred to as endotoxin, because it can bind to the same CD1414 receptor on macrophages, triggering the whole cascade for macrophage/endothelial cellss to secrete pro-inflammatory cytokines.

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