Abstract
Profilin, a ubiquitous low molecular weight (13,000–15,000 Mr) actin binding protein, regulates the formation of F-actin structures in vivo, and is localized to specific cellular regions through interaction with proline-rich sequences. Here we report the 2.2 Å X-ray structure of the complex between human platelet profilin (HPP) and a decamer of L-proline (L-Pro10). The L-Pro10 peptide adopts a left-handed type II poly-L-proline helix (PPM) and binds to a highly conserved patch of aromatic amino acids on the surface of prof ilin. The peptide and actin binding sites reside on orthogonal surfaces, and L-Pro10 binding does not result in a conformational rearrangement of HPP. This structure suggests a mechanism for the localization of prof ilin and its actin-related activities to sites of actin filament assembly in vivo.
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Mahoney, N., Janmey, P. & Almo, S. Structure of the profilin-poly-L-proline complex involved in morphogenesis and cytoskeletal regulation. Nat Struct Mol Biol 4, 953–960 (1997). https://doi.org/10.1038/nsb1197-953
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DOI: https://doi.org/10.1038/nsb1197-953
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