The sarcolipin-bound calcium pump stabilizes calcium sites exposed to the cytoplasm

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The sarcolipin-bound calcium pump stabilizes calcium sites exposed to the cytoplasm. / Winther, Anne-Marie Lund; Bublitz, Maike; Karlsen, Jesper Lykkegaard; Møller, Jesper Vuust; Hansen, John Bondo; Nissen, Poul; Buch-Pedersen, Morten J.

I: Nature, Bind 495, Nr. 7440, 14.03.2013, s. 265-269.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisLetterForskningpeer review

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Winther, A-ML, Bublitz, M, Karlsen, JL, Møller, JV, Hansen, JB, Nissen, P & Buch-Pedersen, MJ 2013, 'The sarcolipin-bound calcium pump stabilizes calcium sites exposed to the cytoplasm', Nature, bind 495, nr. 7440, s. 265-269. https://doi.org/10.1038/nature11900

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Winther, Anne-Marie Lund ; Bublitz, Maike ; Karlsen, Jesper Lykkegaard ; Møller, Jesper Vuust ; Hansen, John Bondo ; Nissen, Poul ; Buch-Pedersen, Morten J. / The sarcolipin-bound calcium pump stabilizes calcium sites exposed to the cytoplasm. I: Nature. 2013 ; Bind 495, Nr. 7440. s. 265-269.

Bibtex

@article{b90a45936ba746258f526d5278b53b3b,
title = "The sarcolipin-bound calcium pump stabilizes calcium sites exposed to the cytoplasm",
abstract = "The contraction and relaxation of muscle cells is controlled by the successive rise and fall of cytosolic Ca(2+), initiated by the release of Ca(2+) from the sarcoplasmic reticulum and terminated by re-sequestration of Ca(2+) into the sarcoplasmic reticulum as the main mechanism of Ca(2+) removal. Re-sequestration requires active transport and is catalysed by the sarcoplasmic reticulum Ca(2+)-ATPase (SERCA), which has a key role in defining the contractile properties of skeletal and heart muscle tissue. The activity of SERCA is regulated by two small, homologous membrane proteins called phospholamban (PLB, also known as PLN) and sarcolipin (SLN). Detailed structural information explaining this regulatory mechanism has been lacking, and the structural features defining the pathway through which cytoplasmic Ca(2+) enters the intramembranous binding sites of SERCA have remained unknown. Here we report the crystal structure of rabbit SERCA1a (also known as ATP2A1) in complex with SLN at 3.1 {\AA} resolution. The regulatory SLN traps the Ca(2+)-ATPase in a previously undescribed E1 state, with exposure of the Ca(2+) sites through an open cytoplasmic pathway stabilized by Mg(2+). The structure suggests a mechanism for selective Ca(2+) loading and activation of SERCA, and provides new insight into how SLN and PLB inhibition arises from stabilization of this E1 intermediate state without bound Ca(2+). These findings may prove useful in studying how autoinhibitory domains of other ion pumps modulate transport across biological membranes",
author = "Winther, {Anne-Marie Lund} and Maike Bublitz and Karlsen, {Jesper Lykkegaard} and M{\o}ller, {Jesper Vuust} and Hansen, {John Bondo} and Poul Nissen and Buch-Pedersen, {Morten J}",
year = "2013",
month = "3",
day = "14",
doi = "10.1038/nature11900",
language = "English",
volume = "495",
pages = "265--269",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "7440",

}

RIS

TY - JOUR

T1 - The sarcolipin-bound calcium pump stabilizes calcium sites exposed to the cytoplasm

AU - Winther, Anne-Marie Lund

AU - Bublitz, Maike

AU - Karlsen, Jesper Lykkegaard

AU - Møller, Jesper Vuust

AU - Hansen, John Bondo

AU - Nissen, Poul

AU - Buch-Pedersen, Morten J

PY - 2013/3/14

Y1 - 2013/3/14

N2 - The contraction and relaxation of muscle cells is controlled by the successive rise and fall of cytosolic Ca(2+), initiated by the release of Ca(2+) from the sarcoplasmic reticulum and terminated by re-sequestration of Ca(2+) into the sarcoplasmic reticulum as the main mechanism of Ca(2+) removal. Re-sequestration requires active transport and is catalysed by the sarcoplasmic reticulum Ca(2+)-ATPase (SERCA), which has a key role in defining the contractile properties of skeletal and heart muscle tissue. The activity of SERCA is regulated by two small, homologous membrane proteins called phospholamban (PLB, also known as PLN) and sarcolipin (SLN). Detailed structural information explaining this regulatory mechanism has been lacking, and the structural features defining the pathway through which cytoplasmic Ca(2+) enters the intramembranous binding sites of SERCA have remained unknown. Here we report the crystal structure of rabbit SERCA1a (also known as ATP2A1) in complex with SLN at 3.1 Å resolution. The regulatory SLN traps the Ca(2+)-ATPase in a previously undescribed E1 state, with exposure of the Ca(2+) sites through an open cytoplasmic pathway stabilized by Mg(2+). The structure suggests a mechanism for selective Ca(2+) loading and activation of SERCA, and provides new insight into how SLN and PLB inhibition arises from stabilization of this E1 intermediate state without bound Ca(2+). These findings may prove useful in studying how autoinhibitory domains of other ion pumps modulate transport across biological membranes

AB - The contraction and relaxation of muscle cells is controlled by the successive rise and fall of cytosolic Ca(2+), initiated by the release of Ca(2+) from the sarcoplasmic reticulum and terminated by re-sequestration of Ca(2+) into the sarcoplasmic reticulum as the main mechanism of Ca(2+) removal. Re-sequestration requires active transport and is catalysed by the sarcoplasmic reticulum Ca(2+)-ATPase (SERCA), which has a key role in defining the contractile properties of skeletal and heart muscle tissue. The activity of SERCA is regulated by two small, homologous membrane proteins called phospholamban (PLB, also known as PLN) and sarcolipin (SLN). Detailed structural information explaining this regulatory mechanism has been lacking, and the structural features defining the pathway through which cytoplasmic Ca(2+) enters the intramembranous binding sites of SERCA have remained unknown. Here we report the crystal structure of rabbit SERCA1a (also known as ATP2A1) in complex with SLN at 3.1 Å resolution. The regulatory SLN traps the Ca(2+)-ATPase in a previously undescribed E1 state, with exposure of the Ca(2+) sites through an open cytoplasmic pathway stabilized by Mg(2+). The structure suggests a mechanism for selective Ca(2+) loading and activation of SERCA, and provides new insight into how SLN and PLB inhibition arises from stabilization of this E1 intermediate state without bound Ca(2+). These findings may prove useful in studying how autoinhibitory domains of other ion pumps modulate transport across biological membranes

U2 - 10.1038/nature11900

DO - 10.1038/nature11900

M3 - Letter

C2 - 23455424

VL - 495

SP - 265

EP - 269

JO - Nature

JF - Nature

SN - 0028-0836

IS - 7440

ER -