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J. Biol. Chem., Vol. 278, Issue 31, 28993-28999, August 1, 2003
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¶


From the
Department of Chemistry, University of
Illinois at Chicago, Chicago, Illinois 60607, the
Medical Research Council Laboratory of Molecular
Biology, Hills Road, Cambridge CB2 2QH, United Kingdom, the
||Department of Microbiology and Immunology, Weill
Medical College of Cornell University, New York, New York 10021, and the
**Howard Hughes Medical Institute and Department of
Cell Biology, Yale University School of Medicine, New Haven, Connecticut
06510
Epsin and AP180/CALM are endocytotic accessory proteins that have been
implicated in the formation of clathrin-coated pits. Both proteins have
phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2)-binding
domains in their N termini, but these domains are structurally and
functionally different. To understand the basis of their distinct properties,
we measured the PtdIns(4,5)P2-dependent membrane binding of the
epsin N-terminal homology (ENTH) domain and the AP180 N-terminal homology
(ANTH) domain by means of surface plasmon resonance and monolayer penetration
techniques and also calculated the effect of PtdIns(4,5)P2 on the
electrostatic potential of these domains. PtdIns(4,5)P2 enhances
the electrostatic membrane association of both domains; however,
PtdIns(4,5)P2 binding exerts distinct effects on their membrane
dissociation. Specifically, PtdIns(4,5)P2 induces the membrane
penetration of the N-terminal
-helix of the ENTH domain, which slows
the membrane dissociation of the domain and triggers the membrane deformation.
These results provide the biophysical explanation for the membrane bending
activity of epsin and its ENTH domain.
Received for publication, March 20, 2003 , and in revised form, May 8, 2003.
* This work was supported by National Institutes of Health Grants GM66147 (to D. M.) and GM52598 and GM53987 (to W. C.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
¶ Supported by an European Molecular Biology Long Term Postdoctoral Fellowship.

To whom correspondence should be addressed: Dept. of Chemistry (M/C 111),
University of Illinois at Chicago, 845 West Taylor St., Chicago, IL
60607-7061. Tel.: 312-996-4883; Fax: 312-996-2183; E-mail:
wcho{at}uic.edu.
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