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It takes two to tango: PROPPINs use two phosphoinositide-binding sites.

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Busse,  R. A.
Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society;

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Scacioc,  A.
Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society;

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Kühnel,  K.
Department of Neurobiology, MPI for biophysical chemistry, Max Planck Society;

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Citation

Thumm, M., Busse, R. A., Scacioc, A., Stephan, M., Janshoff, A., Kühnel, K., et al. (2013). It takes two to tango: PROPPINs use two phosphoinositide-binding sites. Autophagy, 9(1), 106-107. doi:10.4161/auto.22400.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-DDEE-4
Abstract
PROPPINs are a family of PtdIns3P and PtdIns(3,5)P2-binding proteins. The crystal structure now unravels the presence of two distinct phosphoinositide-binding sites at the circumference of the seven bladed β-propeller. Mutagenesis analysis of the binding sites shows that both are required for normal membrane association and autophagic activities. We identified a set of evolutionarily conserved basic and polar residues within both binding pockets, which are crucial for phosphoinositide binding. We expect that membrane association of PROPPINs is further stabilized by membrane insertions and interactions with other proteins