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Nontypeable Haemophilus influenzae type IV pilin subunit A (NTHi PilA)

Target: NTHi PilA
Molecular classification: Structural protein, Pilin (Type IV pilin), Component of type IV pilus (T4P)

Overview

Nontypeable Haemophilus influenzae type IV pilin subunit A (PilA) is a hydrophobic protein that polymerizes to form the core structure of type IV pili on the surface of NTHi. These pili are critical for the bacterium's ability to adhere to host tissues, form biofilms, and establish chronic infections. In vivo, PilA is involved in the stability and structural integrity of the biofilm matrix, making it a key virulence factor. Disruption of PilA, such as through genetic knockout, results in significantly impaired bacterial adhesion and less robust biofilm formation[2][3].

Other names: Pilin APilAType IV pilin of NTHiNTHi Pilin protein

Mechanism of action

Preventing bacterial adhesion by inhibits pilus formation or function; Blocking biofilm formation through antibody neutralization or disrupting pilus assembly

Biological functions

Bacterial adhesion to host epithelial surfacesBiofilm formationTwitching motility (bacterial surface motility)Extracellular matrix stabilization

Disease associations

InfectionBiofilm-associated chronic respiratory diseases (e.g., otitis media, chronic obstructive pulmonary disease, pneumonia due to NTHi)

Safety considerations

Potential for rapid antigenic variation or immune evasion by NTHiLack of cross-reactivity among pilins of different bacteria may limit broad-spectrum targeting

Interacting drugs

None approved; experimental agents include anti-pilus antibodies and pilus assembly inhibitors targeting NTHi

Biomarkers

Type IV pilin (PilA) expression as a marker of NTHi biofilm formation and infection in clinical samples

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