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Default Molecular basis of the PED/PEA15 interaction with the C-terminal fragment of Phospholipase D1 revealed by NMR spectroscopy.

Molecular basis of the PED/PEA15 interaction with the C-terminal fragment of Phospholipase D1 revealed by NMR spectroscopy.

Related Articles Molecular basis of the PED/PEA15 interaction with the C-terminal fragment of Phospholipase D1 revealed by NMR spectroscopy.

Biochim Biophys Acta. 2013 Apr 19;

Authors: Farina B, Doti N, Pirone L, Malgieri G, Pedone EM, Ruvo M, Fattorusso R

Abstract
PED/PEA15 is a small protein involved in many protein-protein interactions that modulates the function of a number of key cellular effectors involved in major cell functions, including apoptosis, proliferation and glucose metabolism. In particular, PED/PEA15 interacts with the phospholipase D (PLD) isoforms 1 and 2 increasing protein kinase C-? isoform activity and affects both insulin-stimulated glucose transport and glucose-stimulated insulin secretion. The C-terminal portion (residues 712-1074) of PLD1, named D4, is still able to interact with PED/PEA15. In this study we characterized, by means of NMR spectroscopy, the molecular interaction of PED/PEA15 with D4?, a smaller region of D4, encompassing residues 712-818, shown to have the same affinity for PED/PEA15 and to induce the same effects as D4 in PED/PEA15-overexpressing cells. Chemical shift perturbation (CSP) studies allowed to define D4? binding site of PED/PEA15 and to identify a smaller region likely affected by an allosteric effect. Moreover, ELISA-like experiments showed that three 20-mer overlapping synthetic peptides, covering the 762-801 region of D4?, strongly inhibit PED/PEA15-D4? interaction through their binding to PED/PEA15 with KDs in low micromolar range. Finally, molecular details of the interaction of PED/PEA15 with one of the three peptides have been revealed by CSP and saturation transfer difference (STD) analyses.


PMID: 23608947 [PubMed - as supplied by publisher]



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