Molecular cloning and expression of the catalytic subunit of protein kinase A from Trypanosoma cruzi

Huan Huang, Craig Werner, Louis M. Weiss, Murray Wittner, George A. Orr

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The activation of protein kinase A (cyclic adenosine monophosphate-dependent protein kinase) by cyclic adenosine monophosphate is believed to play an important role in regulating the growth and differentiation of Trypanosoma cruzi. A PCR using degenerate oligonucleotide primers against conserved motifs in the VIb and VIII subdomains of the ACG family of serine/threonine protein kinases was utilised to amplify regions corresponding to the parasite homologue of the protein kinase A catalytic subunit. This putative protein kinase A fragment was used to isolate the entire gene from T. cruzi genomic libraries. The deduced 329 amino acid sequence of this gene contained all of the signature motifs of known protein kinase A catalytic subunit proteins. The recombinant protein expressed in Escherichia coli was shown to phosphorylate Kemptide, a synthetic peptide substrate of protein kinase A, in a protein kinase inhibitor (PKI)-inhibitory manner. Immunoprecipitation with polyclonal antisera raised against recombinant protein of this gene was able to pull-down PKI-inhibitory phosphotransferase activity from epimastigote lysates. Immunoblot and Northern blot analyses, in combination with enzyme activity assays, revealed that this gene was a stage-regulated enzyme in T. cruzi with higher levels and activity being present in epimastigotes compared with amastigotes or trypomastigotes. Overall these studies indicate that the cloned gene encodes an authentic protein kinase A catalytic subunit from T. cruzi and are the first demonstration of PKI-inhibitory phosphotransferase activity in an expressed protozoan protein kinase A catalytic subunit.

Original languageEnglish (US)
Pages (from-to)1107-1115
Number of pages9
JournalInternational Journal for Parasitology
Volume32
Issue number9
DOIs
StatePublished - 2002

Fingerprint

Cyclic AMP-Dependent Protein Kinase Catalytic Subunits
Trypanosoma cruzi
Molecular Cloning
Cyclic AMP-Dependent Protein Kinases
Catalytic Domain
Protein Kinase Inhibitors
Genes
Recombinant Proteins
kemptide
Protozoan Proteins
Phosphotransferases
DNA Primers
Genomic Library
Protein-Serine-Threonine Kinases
Enzyme Assays
Immunoprecipitation
Northern Blotting
Cyclic AMP
Immune Sera
Amino Acid Sequence

Keywords

  • Cloning and recombinant protein expression
  • Cyclic adenosine monophosphate
  • Developmental expression
  • Protein kinase A (cyclic adenosine monophosphate-dependent protein kinase) catalytic subunit
  • Trypanosoma cruzi

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases

Cite this

Molecular cloning and expression of the catalytic subunit of protein kinase A from Trypanosoma cruzi. / Huang, Huan; Werner, Craig; Weiss, Louis M.; Wittner, Murray; Orr, George A.

In: International Journal for Parasitology, Vol. 32, No. 9, 2002, p. 1107-1115.

Research output: Contribution to journalArticle

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