The Toxoplasma gondii Plastid replication and Repair Enzyme Complex, PREX

A. Mukhopadhyay, Cheng-Yao Chen, C. Doerig, F. L. Henriquez, C. W. Roberts, M. P. Barrett

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A plastid-like organelle, the apicoplast, is essential to the majority of medically and veterinary important apicomplexan protozoa including Toxoplasma gondii and Plasmodium. The apicoplast contains multiple copies of a 35 kb genome, the replication of which is dependent upon nuclear-encoded proteins that are imported into the organelle. In P. falciparum an unusual multi-functional gene, pfprex, was previously identified and inferred to encode a protein with DNA primase, DNA helicase and DNA polymerase activities. Herein, we report the presence of a prex orthologue in T. gondii. The protein is predicted to have a bi-partite apicoplast targeting sequence similar to that demonstrated on the PfPREX polypeptide, capable of delivering marker proteins to the apicoplast. Unlike the P. falciparum gene that is devoid of introns, the T. gondii prex gene carries 19 introns, which are spliced to produce a contiguous mRNA. Bacterial expression of the polymerase domain reveals the protein to be active. Consistent with the reported absence of a plastid in Cryptosporidium species, in silico analysis of their genomes failed to demonstrate an orthologue of prex. These studies indicate that prex is conserved across the plastid-bearing apicomplexans and may play an important role in the replication of the plastid genome.

Original languageEnglish
Pages (from-to)747-755
Number of pages9
JournalParasitology
Volume136
Issue number7
DOIs
Publication statusPublished - 2009 Jun 1

Fingerprint

Apicoplasts
apicoplasts
Plastids
Toxoplasma
Toxoplasma gondii
plastids
Enzymes
enzymes
organelles
introns
proteins
Organelles
Introns
nuclear-encoded proteins
DNA helicases
Plastid Genomes
genome
genes
DNA Primase
Genome

All Science Journal Classification (ASJC) codes

  • Parasitology
  • Animal Science and Zoology
  • Infectious Diseases

Cite this

Mukhopadhyay, A., Chen, C-Y., Doerig, C., Henriquez, F. L., Roberts, C. W., & Barrett, M. P. (2009). The Toxoplasma gondii Plastid replication and Repair Enzyme Complex, PREX. Parasitology, 136(7), 747-755. https://doi.org/10.1017/S0031182009006027
Mukhopadhyay, A. ; Chen, Cheng-Yao ; Doerig, C. ; Henriquez, F. L. ; Roberts, C. W. ; Barrett, M. P. / The Toxoplasma gondii Plastid replication and Repair Enzyme Complex, PREX. In: Parasitology. 2009 ; Vol. 136, No. 7. pp. 747-755.
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Mukhopadhyay, A, Chen, C-Y, Doerig, C, Henriquez, FL, Roberts, CW & Barrett, MP 2009, 'The Toxoplasma gondii Plastid replication and Repair Enzyme Complex, PREX', Parasitology, vol. 136, no. 7, pp. 747-755. https://doi.org/10.1017/S0031182009006027

The Toxoplasma gondii Plastid replication and Repair Enzyme Complex, PREX. / Mukhopadhyay, A.; Chen, Cheng-Yao; Doerig, C.; Henriquez, F. L.; Roberts, C. W.; Barrett, M. P.

In: Parasitology, Vol. 136, No. 7, 01.06.2009, p. 747-755.

Research output: Contribution to journalArticle

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Mukhopadhyay A, Chen C-Y, Doerig C, Henriquez FL, Roberts CW, Barrett MP. The Toxoplasma gondii Plastid replication and Repair Enzyme Complex, PREX. Parasitology. 2009 Jun 1;136(7):747-755. https://doi.org/10.1017/S0031182009006027