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Target intelligence / Profile preview
Fraction I capsular antigen (F1)
- Target
- F1
- Molecular classification
- Capsular Polysaccharide, Protein
01
Overview
The Fraction I capsular antigen (F₁) from *Yersinia pestis* is an essential virulence factor forming an antiphagocytic proteinaceous capsule that enables immune evasion during infection while serving as both a reliable diagnostic marker specific to *Y. pestis* infections and an effective component/prototype for subunit vaccines against plague due to its strong immunoprotective properties.
- Other names
- Fraction I antigenFI capsular antigenCafI protein/capsule
02
Mechanism of action
Blocking phagocytosis; inducing protective antibody response
03
Biological functions
AntiphagocytosisImmune evasionAdherenceVirulence
04
Disease associations
PlagueYersinia pestis infection
05
Safety considerations
Potential for allergic reactions to vaccine formulationsRisk of incomplete protection if vaccine is not properly formulated or administered
06
Biomarkers
Anti-F1 antibodies (diagnostic marker)F1 antigen levels (disease progression)
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