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Weber DK, Reddy UV, Wang S, Larsen EK, Gopinath T, Gustavsson MB, Cornea RL, Thomas DD, De Simone A, Veglia G. Structural basis for allosteric control of the SERCA-Phospholamban membrane complex by Ca 2+ and phosphorylation. eLife 2021; 10:66226. [PMID: 33978571 PMCID: PMC8184213 DOI: 10.7554/elife.66226] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 05/10/2021] [Indexed: 01/26/2023] Open
Abstract
Phospholamban (PLN) is a mini-membrane protein that directly controls the cardiac Ca2+-transport response to β-adrenergic stimulation, thus modulating cardiac output during the fight-or-flight response. In the sarcoplasmic reticulum membrane, PLN binds to the sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA), keeping this enzyme's function within a narrow physiological window. PLN phosphorylation by cAMP-dependent protein kinase A or increase in Ca2+ concentration reverses the inhibitory effects through an unknown mechanism. Using oriented-sample solid-state NMR spectroscopy and replica-averaged NMR-restrained structural refinement, we reveal that phosphorylation of PLN's cytoplasmic regulatory domain signals the disruption of several inhibitory contacts at the transmembrane binding interface of the SERCA-PLN complex that are propagated to the enzyme's active site, augmenting Ca2+ transport. Our findings address long-standing questions about SERCA regulation, epitomizing a signal transduction mechanism operated by posttranslationally modified bitopic membrane proteins.
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Affiliation(s)
- Daniel K Weber
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - U Venkateswara Reddy
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - Songlin Wang
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - Erik K Larsen
- Department of Chemistry, University of Minnesota, Minneapolis, United States
| | - Tata Gopinath
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - Martin B Gustavsson
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - Razvan L Cornea
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - David D Thomas
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States
| | - Alfonso De Simone
- Department of Life Sciences, Imperial College London, South Kensington, London, United Kingdom.,Department of Pharmacy, University of Naples 'Federico II', Naples, Italy
| | - Gianluigi Veglia
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, United States.,Department of Chemistry, University of Minnesota, Minneapolis, United States
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Chen LTL, Yao Q, Soares TA, Squier TC, Bigelow DJ. Phospholamban modulates the functional coupling between nucleotide domains in Ca-ATPase oligomeric complexes in cardiac sarcoplasmic reticulum. Biochemistry 2010; 48:2411-21. [PMID: 19191503 DOI: 10.1021/bi8021526] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Oligomeric interactions between Ca-ATPase polypeptide chains and their modulation by phospholamban (PLB) were measured in native cardiac sarcoplasmic reticulum (SR) microsomes. Progressive modification of Lys(514) with fluorescein 5-isothiocyanate (FITC), which physically blocks access to the nucleotide binding site by ATP, demonstrates that Ca-ATPase active sites function independently of one another prior to the phosphorylation of PLB. However, upon cAMP-dependent protein kinase (PKA) phosphorylation of PLB, a second-order dependence between residual enzyme activity and the fraction of active sites is observed, consistent with a dimeric functional complex. Complementary distance measurements were made using FITC or 5-iodoacetamidofluorescein (IAF) bound to Cys(674) within the N- or P-domains, respectively, to detect structural coupling within oligomeric complexes. Accompanying the phosphorylation of PLB, neighboring Ca-ATPase polypeptide chains exhibit a 4 +/- 2 A decrease in the proximity between FITC sites within the N-domain and a 9 +/- 3 A increase in the proximity between IAF sites within P-domains. Thus, the phosphorylation of PLB induces spatial rearrangements between the N- and P-domain elements of proximal Ca-ATPase polypeptide chains which restore functional interactions between neighboring polypeptide chains and, in turn, result in increased rates of catalytic turnover. These results are interpreted in terms of a structural model, calculated through optimization of shape complementarity, desolvation, and electrostatic energies, which suggests a dimeric arrangement of Ca-ATPase polypeptide chains through the proximal association of N-domains that accommodates interaction with PLB. We suggest that the phosphorylation of PLB acts to release constraints involving interdomain subunit interactions that enhance catalytically important N-domain motions.
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Affiliation(s)
- Linda T L Chen
- Biological Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA
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Froehlich JP, Mahaney JE, Keceli G, Pavlos CM, Goldstein R, Redwood AJ, Sumbilla C, Lee DI, Tocchetti CG, Kass DA, Paolocci N, Toscano JP. Phospholamban Thiols Play a Central Role in Activation of the Cardiac Muscle Sarcoplasmic Reticulum Calcium Pump by Nitroxyl. Biochemistry 2008; 47:13150-2. [DOI: 10.1021/bi801925p] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeffrey P. Froehlich
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - James E. Mahaney
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Gizem Keceli
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Christopher M. Pavlos
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Russell Goldstein
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Abiona J. Redwood
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Carlota Sumbilla
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Dong I. Lee
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Carlo G. Tocchetti
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - David A. Kass
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - Nazareno Paolocci
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
| | - John P. Toscano
- Department of Medicine, Johns Hopkins University, Baltimore, Maryland 21205, Edward Via Virginia College of Osteopathic Medicine, Blacksburg, Virginia 24060, Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, and Department of Clinical Medicine, University of Perugia, Perugia, Italy
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