Multiple receptor states are required to describe both kinetic binding and activation of neutrophils via N-formyl peptide receptor ligands

Cellular Signalling
Tamara L Kinzer-UrsemJennifer J Linderman

Abstract

It is well-established that the binding of N-formyl peptides to the N-formyl peptide receptor on neutrophils can be described by a kinetic scheme that involves two ligand-bound receptor states, both a low affinity ligand-receptor complex and a high affinity ligand-receptor complex, and that the rate constants describing ligand-receptor binding and receptor affinity state interconversion are ligand-specific. Here we examine whether differences due to these rate constants, i.e. differences in the numbers and lifetimes of particular receptor states, are correlated with neutrophil responses, namely actin polymerization and oxidant production. We find that an additional receptor state, one not discerned from kinetic binding assays, is required to account for these responses. This receptor state is interpreted as the number of low affinity bound receptors that are capable of activating G proteins; in other words, the accumulation of these active receptors correlates with the extent of both responses. Furthermore, this analysis allows for the quantification of a parameter that measures the relative strength of a ligand to bias the receptor into the active conformation. A model with this additional receptor state is sufficient to descr...Continue Reading

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Citations

May 29, 2007·Infection and Immunity·Jens Martin HerrmannElizabeth R Simons
Feb 22, 2008·Journal of Theoretical Biology·Christopher J BrinkerhoffJennifer J Linderman
Oct 4, 2016·Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]·Huafeng Zhang, Bingwei Sun
Oct 23, 2008·The Journal of Biological Chemistry·Jennifer J Linderman
Oct 26, 2021·Frontiers in Immunology·Duncan KirbyAnton Zilman

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