Real-time observation of functional specialization among phosphorylation sites in CFTR.

Real-time observation of functional specialization among phosphorylation sites in CFTR.
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DOI:
10.1085/jgp.202213216
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发表时间:
2023-04-03
影响因子:
3.8
通讯作者:
Ahern, Christopher A.
Ahern, Christopher A.
中科院分区:
医学2区
文献类型:
--
作者:
Infield, Daniel T.;Schene, Miranda E.;Fazan, Frederico S.;Galles, Grace D.;Galpin, Jason D.;Ahern, Christopher A.

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Infield and co-authors introduce an approach whereby the individual functional contribution of phosphoserine residues can be observed in real time via site-specific encoding of a caged-serine unnatural amino acid. Phosphoregulation is ubiquitous in biology. Defining the functional roles of individual phosphorylation sites within a multivalent system remains particularly challenging. We have therefore applied a chemical biology approach to light-control the state of single candidate phosphoserines in the canonical anion channel CFTR while simultaneously measuring channel activity. The data show striking non-equivalency among protein kinase A consensus sites, which vary from <10% to >1,000% changes in channel activity upon phosphorylation. Of note, slow phosphorylation of S813 suggests that this site is rate-limiting to the full activation of CFTR. Further, this approach reveals an unexpected coupling between the phosphorylation of S813 and a nearby site, S795. Overall, these data establish an experimental route to understanding roles of specific phosphoserines within complex phosphoregulatory domains. This strategy may be employed in the study of phosphoregulation of other eukaryotic proteins.
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