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15-deoxyspergualin hinders physical interaction between basic residues of transit peptide in PfENR and Hsp70-1

Banerjee, Tanushree and Singh, Rajiv Ranjan and Gupta, Sarika and Surolia, Avadhesha and Surolia, Namita (2012) 15-deoxyspergualin hinders physical interaction between basic residues of transit peptide in PfENR and Hsp70-1. In: IUBMB Life, 64 (1). pp. 99-107.

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The apicoplast of Plasmodium harbors several metabolic pathways. The enzymes required to perform these reactions are all nuclearly encoded and apicoplast targeted (NEAT) proteins. Plasmodium falciparum Enoyl-ACP Reductase (PfENR) is one such NEAT protein. The NEAT proteins have a transit peptide which is required for crossing the membranes of apicoplast. We studied the importance of basic residues like Arginine and Lysine within the transit peptide. Previous studies have suggested that all basic residues are essential for apicoplast trafficking. In this study, we demonstrate that only some of these residues are essential (K44, R48, K51, and R52), whereas others are dispensable (R40, K42, and K49). On mutating these specific residues, PfENR is not imported into the apicoplast and is mislocalized to the cytoplasm. We also demonstrate that these residues are also crucial for interaction with Hsp70-1, implying that interactions of Lysine 44, Arginine 48, Lysine 51, and Arginine 52 of the transit peptide with PfHsp70-1 are required for apicoplast trafficking. 15-Deoxyspergualin, which has earlier been proposed to interact with EEVD motif of PfHsp70-1 hinders the physical interaction between these cationic residues of PfENR and Hsp70-1. Hence, we propose that in the transport competent state of NEAT proteins some specific positively charged amino acids in the transit peptide interact with PfHsp70-1, and this interaction is essential for apicoplast targeting.

Item Type: Journal Article
Publication: IUBMB Life
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: NEAT proteins;PfHsp70-1;apicoplast;15-Deoxyspergualin; trafficking
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 24 Feb 2012 11:51
Last Modified: 24 Feb 2012 11:51
URI: http://eprints.iisc.ac.in/id/eprint/43678

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