A library of 7TM receptor C-terminal tails -: Interactions with the proposed post-endocytic sorting proteins ERM-binding phosphoprotein 50 (EBP50), N-ethylmaleimide-sensitive factor (NSF), sorting nexin 1 (SNX1), and G protein-coupled receptor-associated sorting protein (GASP)

被引:131
作者
Heydorn, A
Sondergaard, BP
Ersboll, B
Holst, B
Nielsen, FC
Haft, CR
Whistler, J
Schwartz, TW [1 ]
机构
[1] Univ Copenhagen, Panum Inst, Dept Pharmacol, Mol Pharmacol Lab, DK-2200 Copenhagen, Denmark
[2] Tech Univ Denmark, DK-2800 Lyngby, Denmark
[3] Rigshosp, Dept Clin Biochem, DK-2200 Copenhagen, Denmark
[4] NIDDK, NIH, Bethesda, MD 20892 USA
[5] Univ Calif San Francisco, Ernest Gallo Res Ctr, San Francisco, CA 94608 USA
[6] 7TM Pharma AS, DK-2970 Horsholm, Denmark
关键词
D O I
10.1074/jbc.M406169200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Adaptor and scaffolding proteins determine the cellular targeting, the spatial, and thereby the functional association of G protein-coupled seven-transmembrane receptors with co-receptors, transducers, and downstream effectors and the adaptors determine post-signaling events such as receptor sequestration through interactions, mainly with the C-terminal intracellular tails of the receptors. A library of tails from 59 representative members of the super family of seven-transmembrane receptors was probed as glutathione S-transferase fusion proteins for interactions with four different adaptor proteins previously proposed to be involved in post-endocytotic sorting of receptors. Of the two proteins suggested to target receptors for recycling to the cell membrane, which is the route believed to be taken by a majority of receptors, ERM (ezrin-radixin-moesin)binding phosphoprotein 50 (EBP50) bound only a single receptor tail, i.e. the beta(2)-adrenergic receptor, whereas N-ethylmaleimide-sensitive factor bound 11 of the tail-fusion proteins. Of the two proteins proposed to target receptors for lysosomal degradation, sorting nexin 1 (SNX1) bound 10 and the C-terminal domain of G protein-coupled receptor-associated sorting protein bound 23 of the 59 tail proteins. Surface plasmon resonance analysis of the binding kinetics of selected hits from the glutathione S-transferase pull-down experiments, i.e. the tails of the virally encoded receptor US28 and the delta-opioid receptor, confirmed the expected nanomolar affinities for interaction with SNX1. Truncations of the NK1 receptor revealed that an extended binding epitope is responsible for the interaction with both SNX1 and G protein-coupled receptor-associated sorting protein as well as with N-ethylmaleimide-sensitive factor. It is concluded that the tail library provides useful information on the general importance of certain adaptor proteins, for example, in this case, ruling out EBP50 as being a broad spectrum-recycling adaptor.
引用
收藏
页码:54291 / 54303
页数:13
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