47 kDa membrane antigen (ambiguous term)

The term '47 kDa membrane antigen' is ambiguous and refers to different proteins in various bacterial species. Most commonly, it denotes: 1) The 47-kDa membrane lipoprotein (Tp47) from *Treponema pallidum* (syphilis causative agent), which is a penicillin-binding protein with carboxypeptidase and beta-lactamase activities, a major immunogen, and critical for syphilis pathogenesis and diagnosis. 2) The 47-kDa outer membrane antigen/protein (HtrA) from *Orientia tsutsugamushi* (scrub typhus pathogen), which is a serine protease, major immunogen, and key for scrub typhus diagnosis and vaccine research. The term '47 kDa membrane antigen' itself is not a single, universal molecule and requires specific organism context for accurate interpretation and structured data curation.

Other names

47-kDa membrane antigen47-kDa membrane lipoprotein47-kDa outer membrane antigen47-kDa outer membrane protein

The mechanism of action varies significantly depending on the specific protein referred to by the ambiguous term. For example, some forms act as enzymes (e.g., penicillin-binding proteins like Tp47 in cell wall synthesis, or serine proteases like O. tsutsugamushi HtrA), while others are targeted by antibodies for pathogen clearance.