The dimeric form of CXCL12 binds to atypical chemokine receptor 1

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2021
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Crawford, Kyler S.
Jensen, Davin R.
Naik, Prachi
Peterson, Francis C.
Duchene, Johan
Rot, Antal
Volkman, Brian F.
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The pleiotropic chemokine CXCL12 is involved in diverse physiological and pathophysiological processes, including embryogenesis, hematopoiesis, leukocyte migration, and tumor metastasis. It is known to engage the classical receptor CXCR4 and the atypical receptor ACKR3. Differential receptor engagement can transduce distinct cellular signals and effects as well as alter the amount of free, extracellular chemokine. CXCR4 binds both monomeric and the more commonly found dimeric forms of CXCL12, whereas ACKR3 binds monomeric forms. Here, we found that CXCL12 also bound to the atypical receptor ACKR1 (previously known as Duffy antigen/receptor for chemokines or DARC). In vitro nuclear magnetic resonance spectroscopy and isothermal titration calorimetry revealed that dimeric CXCL12 bound to the extracellular N terminus of ACKR1 with low nanomolar affinity, whereas the binding affinity of monomeric CXCL12 was orders of magnitude lower. In transfected MDCK cells and primary human Duffy-positive erythrocytes, a dimeric, but not a monomeric, construct of CXCL12 efficiently bound to and internalized with ACKR1. This interaction between CXCL12 and ACKR1 provides another layer of regulation of the multiple biological functions of CXCL12. The findings also raise the possibility that ACKR1 can bind other dimeric chemokines, thus potentially further expanding the role of ACKR1 in chemokine retention and presentation.

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ISO 690GUTJAHR, Julia C., Kyler S. CRAWFORD, Davin R. JENSEN, Prachi NAIK, Francis C. PETERSON, Guerric P. B. SAMSON, Daniel F. LEGLER, Johan DUCHENE, Antal ROT, Brian F. VOLKMAN, 2021. The dimeric form of CXCL12 binds to atypical chemokine receptor 1. In: Science Signaling. American Association for the Advancement of Science (AAAS). 2021, 14(696), eabc9012. ISSN 1945-0877. eISSN 1937-9145. Available under: doi: 10.1126/scisignal.abc9012
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@article{Gutjahr2021-08-17dimer-54774,
  year={2021},
  doi={10.1126/scisignal.abc9012},
  title={The dimeric form of CXCL12 binds to atypical chemokine receptor 1},
  number={696},
  volume={14},
  issn={1945-0877},
  journal={Science Signaling},
  author={Gutjahr, Julia C. and Crawford, Kyler S. and Jensen, Davin R. and Naik, Prachi and Peterson, Francis C. and Samson, Guerric P. B. and Legler, Daniel F. and Duchene, Johan and Rot, Antal and Volkman, Brian F.},
  note={Article Number: eabc9012}
}
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