PfADA2, a Plasmodium falciparum homologue of the transcriptional coactivator ADA2 and its in vivo association with the histone acetyltransferase PfGCN5

Gene
Qi FanLiwang Cui

Abstract

The transcriptional coactivator ADA2 is an evolutionarily conserved component of histone acetyltransferase (HAT) complexes involved in chromatin remodeling and transcriptional regulation in eukaryotes. The Plasmodium falciparum homologue, PfADA2, has a 7737 bp open reading frame, encoding a protein of 2578 amino acids with an ADA2-like domain located near the C-terminus. The annotated PfADA2 in the parasite genome is Pf10_143, located on chromosome 10. Sequence analysis demonstrated the presence of an ADA2 homologue in each Plasmodium species selected for genome sequencing. Mapping of the 5' transcriptional initiation sites suggested that PfADA2 transcription was initiated from multiple sites. Northern analysis detected a major transcript of approximately 8.5 kb in erythrocytic stage parasites. An antiserum raised against the internal ADA2-like domain detected multiple proteins from mixed blood stages, suggesting that PfADA2 may be proteolytically processed. In comparison, affinity-purified anti-GCN5 antibodies reacted with a major protein of approximately 200 kDa and immunoprecipitated proteins from the parasite lysate with HAT activity similar to that of the recombinant GCN5. Moreover, this GCN5-like HAT activity could also b...Continue Reading

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Feb 19, 2009·Antimicrobial Agents and Chemotherapy·S Agbor-EnohM Jung
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