Molecular characterization and ultrastructural localization of Plasmodium falciparum Hsp 60

Ashis Das, Chiang Syin, Hisashi Fujioka, Hong Zheng, Neil Goldman, Masamichi Aikawa, Nirbhay Kumar

Research output: Contribution to journalArticle

Abstract

Heat shock proteins (Hsp) are a group of highly conserved proteins which are widely represented phylogenetically. Genes for members of the Hsp 70, 90 and 60 families have been cloned from the human malaria parasite plasmodium falciparum. In this study, we have cloned and expressed the P. falciparum Hsp 60 (PfHsp60) in E. coli. The sequence analysis identified a previously unknown intron of 257 bp beginning after the nucleotide 142 in the coding sequence. Antisera raised against the recombinant PfHsp60 was employed in immunoprecipitation studies with biosynthetically labeled parasite extracts to investigate regulation of expression of PfHsp60 at various temperatures. In contrast to the three to four fold accumulation of PfHsp60 transcripts in heat shocked parasites (37-40°C), the expression of PfHsp60 was not induced in the blood stages of P. falciparum. On the other hand, the effect of heat induction on PfHsp70 was seen both at the level of specific mRNA and protein. In these studies we also observed co-immunoprecipitation of a number of other cellular proteins suggesting possible interaction with PfHsp60. Immunofluorescence analysis indicated the presence of PfHsp60 in the cytoplasm of all the various stages of the parasite. In addition, immunoelectron microscopic analysis distinctly localized PfHsp60 in the mitochondrion of P. falciparum. This study suggests that different mechanisms are involved in the regulation of expression of various members of the heat shock proteins in the parasite.

Original languageEnglish (US)
Pages (from-to)95-104
Number of pages10
JournalMolecular and Biochemical Parasitology
Volume88
Issue number1-2
DOIs
StatePublished - Sep 1997

Fingerprint

Chaperonin 60
Plasmodium falciparum
Parasites
Heat-Shock Proteins
Immunoprecipitation
Hot Temperature
HSP90 Heat-Shock Proteins
Proteins
HSP70 Heat-Shock Proteins
Falciparum Malaria
Introns
Fluorescent Antibody Technique
Sequence Analysis
Immune Sera
Mitochondria
Cytoplasm
Nucleotides
Escherichia coli

Keywords

  • Chaperonin
  • Heat shock protein 60
  • Malaria
  • Mitochondrion
  • Plastnodium falciparum

ASJC Scopus subject areas

  • Molecular Biology
  • Parasitology

Cite this

Molecular characterization and ultrastructural localization of Plasmodium falciparum Hsp 60. / Das, Ashis; Syin, Chiang; Fujioka, Hisashi; Zheng, Hong; Goldman, Neil; Aikawa, Masamichi; Kumar, Nirbhay.

In: Molecular and Biochemical Parasitology, Vol. 88, No. 1-2, 09.1997, p. 95-104.

Research output: Contribution to journalArticle

Das, Ashis ; Syin, Chiang ; Fujioka, Hisashi ; Zheng, Hong ; Goldman, Neil ; Aikawa, Masamichi ; Kumar, Nirbhay. / Molecular characterization and ultrastructural localization of Plasmodium falciparum Hsp 60. In: Molecular and Biochemical Parasitology. 1997 ; Vol. 88, No. 1-2. pp. 95-104.
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