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Identification of a hypothetical membrane protein interactor of ribosomal phosphoprotein P0

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Abstract

The ribosomal phosphoprotein P0 of the human malarial parasitePlasmodium falciparum (PfP0) has been identified as a protective surface protein. InDrosophila, P0 protein functions in the nucleus. The ribosomal function of P0 is mediated at the stalk of the large ribosomal subunit at the GTPase centre, where the elongation factor eEF2 binds. The multiple roles of the P0 protein presumably occur through interactions with other proteins. To identify such interacting protein domains, a yeast two-hybrid screen was carried out. Out of a set of sixty clones isolated, twelve clones that interacted strongly with both PfP0 and theSaccharomyces cerevisiae P0 (ScP0) protein were analysed. These belonged to three broad classes: namely (i) ribosomal proteins; (ii) proteins involved in nucleotide binding; and (iii) hypothetical integral membrane proteins. One of the strongest interactors (clone 67B) mapped to the gene YFL034W which codes for a hypothetical integral membrane protein, and is conserved amongst several eukaryotic organisms. The insert of clone 67B was expressed as a recombinant protein, and immunoprecipitaion (IP) reaction with anti-P0 antibodies pulled down this protein along with PfP0 as well as ScP0 protein. Using deletion constructions, the domain of ScP0, which interacted with clone 67B, was mapped to 60–148 amino acids. It is envisaged that the surface localization of P0 protein may be mediated through interactions with putative YFL034W-like proteins inP. falciparum

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Abbreviations

GST:

glutathione-S transferase

IP:

immunoprecipitation

ORF:

open reading frame

PfP0:

Plasmodium falciparum phosphoriboprotein P0

ScP0:

Saccharomyces cerevisiae phosphoriboprotein P0

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Authors and Affiliations

  1. Department of Biological Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, 400 005, Mumbai, India

    K. Aruna, Tirtha Chakraborty, Savithri Nambeesan, Abdul Baru Mannan, Alfica Sehgal, Seema R. Bhalchandra & Shobhona Sharma

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  1. K. Aruna
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  2. Tirtha Chakraborty
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  3. Savithri Nambeesan
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  4. Abdul Baru Mannan
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  5. Alfica Sehgal
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  6. Seema R. Bhalchandra
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  7. Shobhona Sharma
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Correspondence to Shobhona Sharma.

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Aruna, K., Chakraborty, T., Nambeesan, S. et al. Identification of a hypothetical membrane protein interactor of ribosomal phosphoprotein P0. J Biosci 29, 33–43 (2004). https://doi.org/10.1007/BF02702559

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  • DOI: https://doi.org/10.1007/BF02702559

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