Trypanosoma cruzi. Surface antigens of blood and culture forms

Journal Article · Sun Mar 01 00:00:00 EST 1981 · J. Exp. Med.; (United States)

DOI:https://doi.org/10.1084/jem.153.3.629· OSTI ID:5734317

Nogueira, N; Chaplan, S; Tydings, J D; Unkeless, J; Cohn, Z

The surface polypeptides of both cultured and blood forms of Trypanosoma cruzi were iodinated by the glucose oxidase-lactoperoxidase technique. Blood-form trypomastigotes (BFT) isolated form infected mice displayed a major 90,000-Mr component. In contrast, both epimastigotes and trypomastigotes obtained form acellular cultures expressed a smaller 75,000-Mr peptide. Both major surface components were presumably glycoproteins in terms of their binding to concanavalin A-Sepharose 4B. Within a 3-h period, both blood and culture forms synthesized their respective surface glycoproteins (90,000 Mr and 75,000 Mr, respectively in vitro. (/sub 35/S)methionine-labeled surface peptides were immunoprecipitated with immune sera of both human and murine origin. A panel of sera form patients with chronic Chagas' disease and hyperimmunized mice recognized similar surface peptides. These immunogens were the same components as the major iodinated species. The major BFT surface peptide was readily removed by trypsin treatment of the parasites, although the procedure did not affect the 75,000-Mr peptide from the culture forms. Two-dimensional polyacrylamide gel electrophoresis revealed that the 90,000-Mr peptide found on BFT was an acidic protein of isoelectric point (pI) 5.0, whereas, the 75,000-Mr peptide form culture-form trypomastigotes has a pI of 7.2. The 90,000-Mr component is thought to be responsible for the anti-phagocytic properties of the BFT (1).

• OSTI ID: 5734317
• Journal Information: J. Exp. Med.; (United States), Vol. 153:3
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
LABELLED COMPOUNDS
ELECTROPHORESIS
POLYPEPTIDES
MOLECULAR WEIGHT
TRYPANOSOMA
ANTIGENS
BLOOD
CELL CULTURES
INFECTIOUS DISEASES
IODINE ISOTOPES
METHIONINE
MICE
PATIENTS
PEROXIDASES
SULFUR 35
AMINO ACIDS
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BODY FLUIDS
CARBOXYLIC ACIDS
DAYS LIVING RADIOISOTOPES
DISEASES
DRUGS
ENZYMES
EVEN-ODD NUCLEI
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ISOTOPES
LIGHT NUCLEI
LIPOTROPIC FACTORS
MAMMALS
MASTIGOPHORA
MATERIALS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDOREDUCTASES
PARASITES
PEPTIDES
PORPHYRINS
PROTEINS
RADIOISOTOPES
RODENTS
SULFUR ISOTOPES
VERTEBRATES
550701* - Microbiology- Tracer Techniques