Skip to main content
Biochemical Journal logoLink to Biochemical Journal
. 1986 Aug 1;237(3):913–917. doi: 10.1042/bj2370913

Evidence for the existence of an Ns-type regulatory protein in Trypanosoma cruzi membranes.

C D Eisenschlos, A A Paladini, L Molina y Vedia, H N Torres, M M Flawiá
PMCID: PMC1147075  PMID: 3099761

Abstract

The existence of a GTP-binding protein of the Ns type in Trypanosoma cruzi was explored. Epimastigote membranes were labelled by cholera toxin in the presence of [adenine-14C]NAD+. After SDS/polyacrylamide-gel electrophoresis of extracted membrane proteins, a single labelled polypeptide band of apparent Mr approx. 45,000 was detected. Epimastigote cells were treated with N-ethylmaleimide and electrofused to lymphoma S49 cells lacking the Ns protein. Evidence indicates that in such electrofusion-generated cell hybrids a heterologous adenylate cyclase system was reconstituted with the Ns protein provided by T. cruzi epimastigotes.

Full text

PDF
913

Images in this article

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Bischoff R., Eisert R. M., Schedel I., Vienken J., Zimmerman U. Human hybridoma cells produced by electro-fusion. FEBS Lett. 1982 Oct 4;147(1):64–68. doi: 10.1016/0014-5793(82)81012-0. [DOI] [PubMed] [Google Scholar]
  2. Eisenschlos C., Flawiá M. M., Torruella M., Torres H. N. Interaction of Trypanosoma cruzi adenylate cyclase with liver regulatory factors. Biochem J. 1986 May 15;236(1):185–191. doi: 10.1042/bj2360185. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Flawiá M. M., Kornblihtt A. R., Reig J. A., Torruella M., Torres H. N. Reconstitution of a hormone-sensitive adenylate cyclase with membrane extracts from Neurospora and avian erythrocytes. J Biol Chem. 1983 Jul 10;258(13):8255–8259. [PubMed] [Google Scholar]
  4. Flawiá M. M., Torres H. N. Adenylate cyclase activity in Neurospora crassa. I. General properties. J Biol Chem. 1972 Nov 10;247(21):6873–6879. [PubMed] [Google Scholar]
  5. HARRIS H., WATKINS J. F. HYBRID CELLS DERIVED FROM MOUSE AND MAN: ARTIFICIAL HETEROKARYONS OF MAMMALIAN CELLS FROM DIFFERENT SPECIES. Nature. 1965 Feb 13;205:640–646. doi: 10.1038/205640a0. [DOI] [PubMed] [Google Scholar]
  6. Hubbard A. L., Cohn Z. A. Externally disposed plasma membrane proteins. I. Enzymatic iodination of mouse L cells. J Cell Biol. 1975 Feb;64(2):438–460. doi: 10.1083/jcb.64.2.438. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Mason B. D., Townsley P. M. Dielectrophoretic separation of living cells. Can J Microbiol. 1971 Jul;17(7):879–888. doi: 10.1139/m71-141. [DOI] [PubMed] [Google Scholar]
  8. Orly J., Schramm M. Coupling of catecholamine receptor from one cell with adenylate cyclase from another cell by cell fusion. Proc Natl Acad Sci U S A. 1976 Dec;73(12):4410–4414. doi: 10.1073/pnas.73.12.4410. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Poste G., Allison A. C. Membrane fusion. Biochim Biophys Acta. 1973 Dec 28;300(4):421–465. doi: 10.1016/0304-4157(73)90015-4. [DOI] [PubMed] [Google Scholar]
  10. Powers S., Kataoka T., Fasano O., Goldfarb M., Strathern J., Broach J., Wigler M. Genes in S. cerevisiae encoding proteins with domains homologous to the mammalian ras proteins. Cell. 1984 Mar;36(3):607–612. doi: 10.1016/0092-8674(84)90340-4. [DOI] [PubMed] [Google Scholar]
  11. Reymond C. D., Gomer R. H., Mehdy M. C., Firtel R. A. Developmental regulation of a Dictyostelium gene encoding a protein homologous to mammalian ras protein. Cell. 1984 Nov;39(1):141–148. doi: 10.1016/0092-8674(84)90199-5. [DOI] [PubMed] [Google Scholar]
  12. Ross E. M., Howlett A. C., Ferguson K. M., Gilman A. G. Reconstitution of hormone-sensitive adenylate cyclase activity with resolved components of the enzyme. J Biol Chem. 1978 Sep 25;253(18):6401–6412. [PubMed] [Google Scholar]
  13. Torruella M., Flawiá M. M., Eisenschlos C., Molina y Vedia L., Rubinstein C. P., Torres H. N. Trypanosoma cruzi adenylate cyclase activity. Purification and characterization. Biochem J. 1986 Feb 15;234(1):145–150. doi: 10.1042/bj2340145. [DOI] [PMC free article] [PubMed] [Google Scholar]
  14. Whittaker R. H., Margulis L. Protist classification and the kingdoms of organisms. Biosystems. 1978 Apr;10(1-2):3–18. doi: 10.1016/0303-2647(78)90023-0. [DOI] [PubMed] [Google Scholar]

Articles from Biochemical Journal are provided here courtesy of The Biochemical Society

RESOURCES