High-quality, highly specific reagents targeting parasitic antigens are indispensable for understanding host–pathogen interactions, developing accurate diagnostic assays, and advancing therapeutic interventions against parasitic diseases. Among the many targets in parasitology, L112, L89, LC55, Tox48, and Toxoplasma gondii P30 stand out as critical targets in toxoplasmosis research, serological diagnosis, and vaccine development. Monoclonal and polyclonal antibodies against these markers enable precise identification of infection status, differentiation between acute and chronic stages, and evaluation of immune responses—driving breakthroughs from basic parasitology to clinical diagnostic applications.

 

Toxoplasma gondii P30(SAG1): The Gold Standard Surface Antigen for Serodiagnosis

Toxoplasma gondii P30, also known as SAG1 (surface antigen 1), is the most abundant and immunodominant surface protein expressed on the tachyzoite stage of Toxoplasma gondii. This 30 kDa protein belongs to the SAG1-related sequence (SRS) superfamily and plays a critical role in host cell attachment and invasion. Due to its high immunogenicity and surface accessibility, Toxoplasma gondii P30 is recognised as the prototypic antigen for both diagnostic and immunoprophylactic applications.

Monoclonal antibodies targeting Toxoplasma gondii P30 are now applied in several key areas:

  • Serological Diagnosis: Anti-P30 antibodies      are widely used in ELISA and immunoblotting platforms to detect T. gondii-specific      IgG and IgM antibodies in patient serum. The high abundance and immunodominance      of P30 make it an ideal capture antigen for differentiating acute from chronic      infections.

  • Vaccine Development: As a major protective      antigen, Toxoplasma      gondii P30      is considered a promising candidate for subunit vaccines against toxoplasmosis.      Recombinant P30 proteins and peptide derivatives have been evaluated for their      ability to elicit protective humoral and cellular immune responses.

  • Invasion Mechanism Studies: Antibodies against      Toxoplasma      gondii P30      have demonstrated the ability to block parasite attachment to host cells, confirming      the essential role of SAG1 in the invasion process. This makes P30 a valuable      target for studying host–pathogen interactions at the molecular level.

 

Tox48: A Key Antigen for Tachyzoite Detection

Tox48 refers to a range of tachyzoite antigens with molecular weights spanning approximately 13 to 48 kDa. Antibodies recognising Tox48 antigens are particularly valuable for detecting T. gondii infection in veterinary species—notably in sheep vaccinated with the S48 strain (Toxovax), where the IgG response is dominated by antibodies recognising the 30–32 kDa band.

The Tox48 antigen panel enables:

  • Vaccine Efficacy Monitoring: Tracking antibody      responses to vaccination in livestock and companion animals

  • Congenital Toxoplasmosis      Diagnosis:      Detecting stage-specific antigens for improved diagnostic accuracy in pregnant      women and neonates

  • Cross-Strain Reactivity      Studies:      Many antigens of the S48 tachyzoites have molecular weights similar to antigens      identified in other T. gondii strains, making Tox48 reagents broadly applicable      across different parasite isolates

 

L112: A Monoclonal Antibody for Rhoptry Antigen Detection

L112 is a monoclonal antibody of the immunoglobulin G (IgG) class that targets rhoptry antigens of Toxoplasma gondii. Rhoptries are specialised secretory organelles that play a critical role in parasite invasion and host cell manipulation. Antibodies such as L112 have been shown to inhibit a penetration-enhancing factor of T. gondii, demonstrating functional activity beyond simple antigen detection.

 

L89: A Marker for Toxoplasma Strain Characterisation and Genetic Typing

L89 is associated with strain-specific differentiation of Toxoplasma gondii. The ToxoDB PCR-RFLP genotype #89 has been identified in various geographical regions, providing valuable information for understanding the population structure and transmission dynamics of this parasite.

 

LC55: A Novel Virulence Factor in Toxoplasma Pathogenesis

LC55 is closely associated with ROP55, a newly identified rhoptry bulb protein that functions as a major virulence factor in Toxoplasma gondii. ROP55 promotes parasite survival by preventing lytic host cell death through the repression of NF-κB signalling. In the absence of IFN-γ stimulation, ROP55 enables T. gondii to evade host immune clearance. Studies have shown that ROP55-knockout parasites exhibit a substantial decrease in parasite load in the spleen of infected mice, confirming its essential role in virulence.

 

How to Choose and Buy?

At BOT Bioscience , we are committed to providing premium-quality Parasitic Infections Targets to support your cutting‑edge research in parasitology, infectious disease diagnostics, and vaccine development.

For researchers interested in exploring Parasitic Infections Targets for toxoplasmosis research, diagnostic development, or vaccine evaluation, BOT Bioscience offers comprehensive technical support and customisation services to meet your specific project requirements. Please Contact us or send an email at info@bot-bioscience.com for product inquiries, quotations, and more detailed information.