Classification of Proteus penneri lipopolysaccharides into core region serotypes

Area of Science:

• Microbiology
• Immunology
• Bacterial Pathogenesis

Background:

• Proteus penneri infections are increasing, with isolates often exhibiting multi-drug resistance.
• P. penneri lipopolysaccharide (LPS) can trigger septic shock.
• The O-specific polysaccharide (OPS) of P. penneri LPS is well-characterized, but the core region's serological specificity requires further investigation.

Purpose of the Study:

• To analyze the serological reactivity of P. penneri LPS core regions.
• To develop a comprehensive serotyping scheme for P. penneri LPS core structures.
• To aid in the classification of clinical P. penneri isolates.

Main Methods:

• Enzyme-linked immunosorbent assay (ELISA)
• Passive immunohemolysis
• Western blot technique
• Analysis of 25 P. penneri LPS core regions using polyclonal antisera

Main Results:

• The study identified five new core serotypes for P. penneri.
• A serotyping scheme was created for 35 P. penneri and 3 P. mirabilis strains based on LPS core reactivities.
• This scheme, combined with O-type classification, facilitates the serotyping of clinical Proteus isolates.

Conclusions:

• The developed serotyping scheme based on LPS core reactivities provides a valuable tool for classifying P. penneri.
• This classification system will improve the understanding and management of P. penneri infections.
• Further research into LPS structure and serology is crucial for combating antibiotic-resistant bacteria.