Cyclic AMP-dependent protein kinase activity in Trypanosoma cruzi

R. M. Ulloa, Enrique A Mesri, M. Esteva, H. N. Torres, M. T. Tellez-Inon

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

A cyclic AMP-dependent protein kinase activity from epimastigote forms of Trypanosoma cruzi was characterized. Cytosolic extracts were chromatographed on DEAE-cellulose columns, giving two peaks of kinase activity, which were eluted at 0.15 M- and 0.32 M-NaCl respectively. The second activity peak was stimulated by nanomolar concentrations of cyclic AMP. In addition, a cyclic AMP-binding protein co-eluted with the second kinase activity peak. Cyclic AMP-dependent protein kinase activity was further purified by gel filtration, affinity chromatography on histone-agarose and cyclic AMP-agarose, as well as by chromatography on CM-Sephadex. The enzyme ('holoenzyme') could be partially dissociated into two different components: 'catalytic' and 'regulatory'. The 'regulatory' component had specific binding for cyclic AMP, and it inhibited phosphotransferase activity of the homologous 'catalytic component' or of the 'catalytic subunit' from bovine heart. Cyclic AMP reversed these inhibitions. A 'holoenzyme preparation' was phosphorylated in the absence of exogenous phosphate acceptor and analyzed by polyacrylamide- gel electrophoresis. A 56 kDa band was phosphorylated. The same preparation was analysed by Western blotting, by using polyclonal antibodies to the regulatory subunits of protein kinases type I or II. Both antibodies reacted with the 56 kDa band.

Original languageEnglish
Pages (from-to)319-326
Number of pages8
JournalBiochemical Journal
Volume255
Issue number1
StatePublished - Jan 1 1988
Externally publishedYes

Fingerprint

Trypanosoma cruzi
Cyclic AMP-Dependent Protein Kinases
Cyclic AMP
Holoenzymes
Phosphotransferases
Affinity chromatography
DEAE-Cellulose
Antibodies
Chromatography
Electrophoresis
Affinity Chromatography
Histones
Sepharose
Protein Kinases
Gel Chromatography
Polyacrylamide Gel Electrophoresis
Catalytic Domain
Carrier Proteins
Western Blotting
Gels

ASJC Scopus subject areas

  • Biochemistry

Cite this

Ulloa, R. M., Mesri, E. A., Esteva, M., Torres, H. N., & Tellez-Inon, M. T. (1988). Cyclic AMP-dependent protein kinase activity in Trypanosoma cruzi. Biochemical Journal, 255(1), 319-326.

Cyclic AMP-dependent protein kinase activity in Trypanosoma cruzi. / Ulloa, R. M.; Mesri, Enrique A; Esteva, M.; Torres, H. N.; Tellez-Inon, M. T.

In: Biochemical Journal, Vol. 255, No. 1, 01.01.1988, p. 319-326.

Research output: Contribution to journalArticle

Ulloa, RM, Mesri, EA, Esteva, M, Torres, HN & Tellez-Inon, MT 1988, 'Cyclic AMP-dependent protein kinase activity in Trypanosoma cruzi', Biochemical Journal, vol. 255, no. 1, pp. 319-326.
Ulloa RM, Mesri EA, Esteva M, Torres HN, Tellez-Inon MT. Cyclic AMP-dependent protein kinase activity in Trypanosoma cruzi. Biochemical Journal. 1988 Jan 1;255(1):319-326.
Ulloa, R. M. ; Mesri, Enrique A ; Esteva, M. ; Torres, H. N. ; Tellez-Inon, M. T. / Cyclic AMP-dependent protein kinase activity in Trypanosoma cruzi. In: Biochemical Journal. 1988 ; Vol. 255, No. 1. pp. 319-326.
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