Role of the carboxyl terminal di-leucine in phosphorylation and internalization of C5a receptor

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Abstract

The carboxyl tail of G protein-coupled receptors contains motifs that regulate receptor interactions with intracellular partners. Activation of the human neutrophil complement fragment C5a receptor (C5aR) is terminated by phosphorylation of the carboxyl tail followed by receptor internalization. In this study, we demonstrated that bulky hydrophobic residues in the membrane-proximal region of the C5aR carboxyl tail play an important role in proper structure and function of the receptor: Substitution of leucine 319 with alanine (L319A) resulted in receptor retention in the endoplasmic reticulum, whereas a L318A substitution allowed receptor transport to the cell surface, but showed slow internalization upon activation, presumably due to a defect in phosphorylation by both PKC and GRK. Normal agonist-induced activation of ERK1/2 and intracellular calcium release suggested that the L318A mutation did not affect receptor signaling. Binding of GRK2 and PKCβII to intracellular loop 3 of C5aR in vitro indicated that mutagenesis of L318 did not affect kinase binding. Limited proteolysis with trypsin revealed a conformational difference between wild type and mutant receptor. Our studies support a model in which the L318/L319 stabilizes an amphipathic helix (Q305–R320) in the membrane-proximal region of C5aR.

Abbreviations

C5aR
C5a receptor
GPCR
G protein-coupled receptor
GRK
G protein-coupled receptor kinase
ERK1/2
extracellular signal-regulated kinase 1/2
CHO
Chinese hamster ovary
EndoH
endoglycosidase H
AR
adrenergic receptor

Keywords

Chemoattractant receptor
Endocytosis
Protein folding
Cytoplasmic helix 8

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