1887

Abstract

Summary: Pseudomonas aeruginosa PML14e is a mutant strain, isolated from strain PML14 (Homma serotype I), that is resistant to all types of R-pyocins. PML14e completely lacked glucose and rhamnose as components of the lipopolysaccharide (LPS) outer core region. Whereas the O-polysaccharide attachment site on the LPS core was considered to be absent, PML14e was agglutinable with anti-serotype-I antibodies. The O-polysaccharide of PML14e was recovered in the supernatant after ultracentrifugation of the aqueous layer from a hot phenol/water extraction. Chromatographic behaviour and chemical analysis indicated that the PML14e O-polysaccharide was not linked to the lipid A. H-NMR spectroscopy indicated that the structure of the PML14e O-polysaccharide was the same as that of the O-polysaccharide from PML14. The above evidence indicated that the O-polysaccharide is expressed on the cell surface of the mutant strain PML14e as the lipid A-free form. To examine the nature of the cell surface, the accessibility of monoclonal antibodies (mAbs) against cell surface antigens was tested by enzyme-linked immunosorbent assay. An anti-lipid A mAb and an anti-outer-membrane protein mAb, the epitopes for which are considered to be exposed on rough strains, bound to a greater extent to the PML14e cells than to two other LPS-core-defective rough mutants, PML14b and PML14d. Whereas these mutants appeared to have lesser defects in the LPS core, they expressed less O-polysaccharide than PML14e. The results indicated that the epitopes exposed on rough strains, such as lipid A and outer-membrane proteins, were mainly hindered by covalently linked core oligosaccharide rather than by the O-polysaccharide chain.

Loading

Article metrics loading...

/content/journal/micro/10.1099/13500872-142-2-289
1996-02-01
2019-11-18
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journal/micro/10.1099/13500872-142-2-289
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error