Structure of an Arrestin2-clathrin Complex Reveals a Novel Clathrin Binding Domain that Modulates Receptor Trafficking

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of Biological Chemistry

DOI:https://doi.org/10.1074/jbc.M109.023366· OSTI ID:1019671

Kang, D; Kern, R; Puthenveedu, M; von Zastrow, M; Williams, J; Benovic, J

Non-visual arrestins play a pivotal role as adaptor proteins in regulating the signaling and trafficking of multiple classes of receptors. Although arrestin interaction with clathrin, AP-2, and phosphoinositides contributes to receptor trafficking, little is known about the configuration and dynamics of these interactions. Here, we identify a novel interface between arrestin2 and clathrin through x-ray diffraction analysis. The intrinsically disordered clathrin binding box of arrestin2 interacts with a groove between blades 1 and 2 in the clathrin {beta}-propeller domain, whereas an 8-amino acid splice loop found solely in the long isoform of arrestin2 (arrestin2L) interacts with a binding pocket formed by blades 4 and 5 in clathrin. The apposition of the two binding sites in arrestin2L suggests that they are exclusive and may function in higher order macromolecular structures. Biochemical analysis demonstrates direct binding of clathrin to the splice loop in arrestin2L, whereas functional analysis reveals that both binding domains contribute to the receptor-dependent redistribution of arrestin2L to clathrin-coated pits. Mutagenesis studies reveal that the clathrin binding motif in the splice loop is (L/I){sub 2}GXL. Taken together, these data provide a framework for understanding the dynamic interactions between arrestin2 and clathrin and reveal an essential role for this interaction in arrestin-mediated endocytosis.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1019671
• Report Number(s): BNL--95517-2011-JA
• Journal Information: Journal of Biological Chemistry, Journal Name: Journal of Biological Chemistry Journal Issue: 43 Vol. 284; ISSN JBCHA3; ISSN 0021-9258
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
99 GENERAL AND MISCELLANEOUS
CONFIGURATION
FUNCTIONAL ANALYSIS
MUTAGENESIS
PROTEINS
X-RAY DIFFRACTION
national synchrotron light source