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Biochem Biophys Res Commun. 1995 May 5;210(1):159-64.

The carboxy-terminal tail domain of vinculin contains a cryptic binding site for acidic phospholipids.

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Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.


Using a gel filtration assay, we have characterized the binding of acidic phospholipids to vinculin. Vinculin binds phosphatidyinositol (Kd approximately 5 microM) in a reversible, saturable manner in low ionic strength buffers. This interaction is inhibited substantially at 100 mM NaCl and therefore may not be of physiological interest. In contrast, the carboxy-terminal 30-kDa fragment of vinculin, produced by S. aureus V8 protease cleavage, binds acidic phospholipids more tightly than the intact protein, and in a manner insensitive to 100 mM NaCl. Re-addition of the 95-kDa head fragment to the tail restores salt-sensitivity to the tail-lipid interaction. These data indicate that under physiologic ionic conditions, the intramolecular head-tail interaction in vinculin masks a high affinity acidic phospholipid binding site present in the tail domain.

[Indexed for MEDLINE]

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