Cross-reactivity between six Enterobacteriaceae complete lipopolysaccharide core chemotypes.

Abstract:

:To gain insight into the value of lipopolysaccharide (LPS) core determinants for cross-protective immunisation the serological relationships between six complete (LPS) core types from Enterobacteriaceae were investigated. Hyperimmune sera were raised in mice by repeated immunisation with heat-killed strains of Salmonella choleraesuis (Ra core type) or Escherichia coli (core types R1, R2, R3, R4 and K12) and characterised for reactivity with complete and incomplete core chemotypes by ELISA and immunoblotting. Three sera (anti-Ra, anti-R2 and anti-R3) reacted strongly with 3-5 different complete core types whereas the other three (anti-R1, anti-R4 and anti-K12) reacted strongly only with their homologous core types in these assays. Two approaches were used to examine further the structural bases for cross-reactivity between these cores. By the first approach the anti-complete-core sera were tested for cross-reactivity with truncated forms of the Salmonella species core (incomplete cores) derived from core-defective mutants. By the second approach, antisera raised against some core-defective mutants were tested for cross-reactivity with complete cores. The results of these investigations revealed that several pair-wise combinations of core types can be used as immunogens to elicit immune responses that recognise all six core types and that the major determinants which mediate cross-reactivity between complete cores are localised in the outer core region.

journal_name

J Med Microbiol

authors

Nnalue NA,Khan GN,Mustafa N

doi

10.1099/00222615-48-5-433

keywords:

subject

Has Abstract

pub_date

1999-05-01 00:00:00

pages

433-441

issue

5

eissn

0022-2615

issn

1473-5644

journal_volume

48

pub_type

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