Molecular basis for the binding and selective dephosphorylation of Na+/H+ exchanger 1 by calcineurin
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Molecular basis for the binding and selective dephosphorylation of Na+/H+ exchanger 1 by calcineurin. / Hendus-Altenburger, Ruth; Wang, Xinru; Sjøgaard-Frich, Lise M.; Pedraz Cuesta, Elena; Sheftic, Sarah R.; Bendsøe, Anne H.; Page, Rebecca; Kragelund, Birthe B.; Pedersen, Stine F; Peti, Wolfgang.
I: Nature Communications, Bind 10, 3489, 2019.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Molecular basis for the binding and selective dephosphorylation of Na+/H+ exchanger 1 by calcineurin
AU - Hendus-Altenburger, Ruth
AU - Wang, Xinru
AU - Sjøgaard-Frich, Lise M.
AU - Pedraz Cuesta, Elena
AU - Sheftic, Sarah R.
AU - Bendsøe, Anne H.
AU - Page, Rebecca
AU - Kragelund, Birthe B.
AU - Pedersen, Stine F
AU - Peti, Wolfgang
PY - 2019
Y1 - 2019
N2 - Very little is known about how Ser/Thr protein phosphatases specifically recruit and dephosphorylate substrates. Here, we identify how the Na+/H+-exchanger 1 (NHE1), a key regulator of cellular pH homeostasis, is regulated by the Ser/Thr phosphatase calcineurin (CN). NHE1 activity is increased by phosphorylation of NHE1 residue T779, which is specifically dephosphorylated by CN. While it is known that Ser/Thr protein phosphatases prefer pThr over pSer, we show that this preference is not key to this exquisite CN selectivity. Rather a combination of molecular mechanisms, including recognition motifs, dynamic charge-charge interactions and a substrate interaction pocket lead to selective dephosphorylation of pT779. Our data identify T779 as a site regulating NHE1-mediated cellular acid extrusion and provides a molecular understanding of NHE1 substrate selection by CN, specifically, and how phosphatases recruit specific substrates, generally.
AB - Very little is known about how Ser/Thr protein phosphatases specifically recruit and dephosphorylate substrates. Here, we identify how the Na+/H+-exchanger 1 (NHE1), a key regulator of cellular pH homeostasis, is regulated by the Ser/Thr phosphatase calcineurin (CN). NHE1 activity is increased by phosphorylation of NHE1 residue T779, which is specifically dephosphorylated by CN. While it is known that Ser/Thr protein phosphatases prefer pThr over pSer, we show that this preference is not key to this exquisite CN selectivity. Rather a combination of molecular mechanisms, including recognition motifs, dynamic charge-charge interactions and a substrate interaction pocket lead to selective dephosphorylation of pT779. Our data identify T779 as a site regulating NHE1-mediated cellular acid extrusion and provides a molecular understanding of NHE1 substrate selection by CN, specifically, and how phosphatases recruit specific substrates, generally.
U2 - 10.1038/s41467-019-11391-7
DO - 10.1038/s41467-019-11391-7
M3 - Journal article
C2 - 31375679
VL - 10
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 3489
ER -
ID: 225278886