Identification of a signal transduction switch in the chemokine receptor CXCR1

Katsutoshi Suetomi, Daniel Rojo, Javier Navarro

Research output: Contribution to journalArticle

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Abstract

Chemokine receptors belong to the superfamily of G protein-coupled receptors, which regulate the trafficking and activation of leukocytes, and operate as coreceptors in the entry of HIV-1. To investigate the early steps in the signal transmission from the chemokine-binding site to the G protein-coupling region we engineered metal ion-binding sites at putative extracellular sites in the chemokine receptor CXCR1. We introduced histidines into sites located in the second and third putative extracellular loops of CXCR1, creating single, double, and triple mutant receptors: R199H, R203H, D265H, R199H/R203H, R199H/D265H, R203H/D265H, R199H/D265H, R203H/H207Q, and R199H/R203H/D265H and R199H/R203H/D265H. Cells expressing the double mutants R199H/D265H and R203H/D265H and the triple mutant R199H/R203H/D265H failed to trigger interleukin 8-dependent calcium responses. Interestingly, calcium responses mediated by the single mutant R203H and the double mutants R199H/R203H and R203H/H207Q were blocked by Zn(II), indicating the creation of a functional metal ion-binding site. On the other hand, cells expressing all single, double, or triple histidine-substituted CXCR1 demonstrated high affinity binding to interleukin 8 in the presence and absence of metal ions. These findings indicate that occupation of the engineered metal-binding site uncouples the chemokine-binding site from the activation mechanism in CXCR1. Most importantly, we identify for the first time elements of an early signal transduction switch of chemokine receptors before the activation of cytoplasmic G proteins.

Original languageEnglish (US)
Pages (from-to)31563-31566
Number of pages4
JournalJournal of Biological Chemistry
Volume277
Issue number35
DOIs
StatePublished - Aug 30 2002

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Signal transduction
Chemokine Receptors
Signal Transduction
Binding Sites
Switches
Metals
Metal ions
Chemical activation
Ions
Interleukin-8
Chemokines
GTP-Binding Proteins
Histidine
Cells
Calcium
G-Protein-Coupled Receptors
Occupations
HIV-1
Leukocytes

ASJC Scopus subject areas

  • Biochemistry

Cite this

Identification of a signal transduction switch in the chemokine receptor CXCR1. / Suetomi, Katsutoshi; Rojo, Daniel; Navarro, Javier.

In: Journal of Biological Chemistry, Vol. 277, No. 35, 30.08.2002, p. 31563-31566.

Research output: Contribution to journalArticle

Suetomi, Katsutoshi ; Rojo, Daniel ; Navarro, Javier. / Identification of a signal transduction switch in the chemokine receptor CXCR1. In: Journal of Biological Chemistry. 2002 ; Vol. 277, No. 35. pp. 31563-31566.
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