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  1. Article ; Online: Missense variants in phospholamban and cardiac myosin binding protein identified in patients with a family history and clinical diagnosis of dilated cardiomyopathy.

    Armanious, Gareth P / Lemieux, M Joanne / Espinoza-Fonseca, L Michel / Young, Howard S

    Biochimica et biophysica acta. Molecular cell research

    2024  Volume 1871, Issue 4, Page(s) 119699

    Abstract: As the genetic landscape of cardiomyopathies continues to expand, the identification of missense variants in disease-associated genes frequently leads to a classification of variant of uncertain significance (VUS). For the proper reclassification of such ...

    Abstract As the genetic landscape of cardiomyopathies continues to expand, the identification of missense variants in disease-associated genes frequently leads to a classification of variant of uncertain significance (VUS). For the proper reclassification of such variants, functional characterization is an important contributor to the proper assessment of pathogenic potential. Several missense variants in the calcium transport regulatory protein phospholamban have been associated with dilated cardiomyopathy. However, >40 missense variants in this transmembrane peptide are currently known and most remain classified as VUS with little clinical information. Similarly, missense variants in cardiac myosin binding protein have been associated with hypertrophic cardiomyopathy. However, hundreds of variants are known and many have low penetrance and are often found in control populations. Herein, we focused on novel missense variants in phospholamban, an Ala
    MeSH term(s) Child, Preschool ; Female ; Humans ; Middle Aged ; Calcium/metabolism ; Calcium-Binding Proteins/genetics ; Calcium-Binding Proteins/metabolism ; Cardiac Myosins/genetics ; Cardiac Myosins/metabolism ; Cardiomyopathy, Dilated/diagnosis ; Cardiomyopathy, Dilated/genetics ; Cardiomyopathy, Dilated/metabolism ; Peptides/metabolism ; Carrier Proteins/genetics ; Carrier Proteins/metabolism
    Chemical Substances Calcium (SY7Q814VUP) ; Calcium-Binding Proteins ; Cardiac Myosins (EC 3.6.1.-) ; Peptides ; phospholamban ; myosin-binding protein C ; Carrier Proteins
    Language English
    Publishing date 2024-02-22
    Publishing country Netherlands
    Document type Case Reports ; Journal Article ; Review
    ZDB-ID 60-7
    ISSN 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbamcr.2024.119699
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  2. Article ; Online: Functional Role of an Unusual Transmembrane Acidic Residue in the Calcium Pump Regulator Myoregulin.

    Liu, Andy Y / Rathod, Nishadh / Guerrero-Serna, Guadalupe / Young, Howard S / Espinoza-Fonseca, L Michel

    Biochemistry

    2023  Volume 62, Issue 8, Page(s) 1331–1336

    Abstract: Myoregulin (MLN) is a member of the regulin family, a group of homologous membrane proteins that bind to and regulate the activity of the sarcoplasmic reticulum ... ...

    Abstract Myoregulin (MLN) is a member of the regulin family, a group of homologous membrane proteins that bind to and regulate the activity of the sarcoplasmic reticulum Ca
    MeSH term(s) Calcium/metabolism ; Calcium-Binding Proteins/chemistry ; Ion Transport ; Molecular Conformation ; Muscle, Skeletal/metabolism ; Sarcoplasmic Reticulum/chemistry ; Sarcoplasmic Reticulum/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/chemistry ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism ; Humans
    Chemical Substances Calcium (SY7Q814VUP) ; Calcium-Binding Proteins ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8)
    Language English
    Publishing date 2023-04-04
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1108-3
    ISSN 1520-4995 ; 0006-2960
    ISSN (online) 1520-4995
    ISSN 0006-2960
    DOI 10.1021/acs.biochem.3c00026
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  3. Article ; Online: Regulating the regulator: intramembrane proteolysis of vesicular trafficking proteins and the SERCA regulator phospholamban.

    Young, Howard S / Lemieux, M Joanne

    EMBO reports

    2019  Volume 20, Issue 3

    Language English
    Publishing date 2019-02-25
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 2020896-0
    ISSN 1469-3178 ; 1469-221X
    ISSN (online) 1469-3178
    ISSN 1469-221X
    DOI 10.15252/embr.201947792
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  4. Article ; Online: Replacement of Lys27 by asparagine in the SERCA regulator myoregulin: A Ca

    Rathod, Nishadh / Guerrero-Serna, Guadalupe / Young, Howard S / Espinoza-Fonseca, L Michel

    Biochimica et biophysica acta. Molecular cell research

    2023  Volume 1871, Issue 1, Page(s) 119613

    Abstract: Myoregulin (MLN) is a protein that regulates the activity of the sarcoplasmic reticulum ... ...

    Abstract Myoregulin (MLN) is a protein that regulates the activity of the sarcoplasmic reticulum Ca
    MeSH term(s) Asparagine/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/genetics ; Sarcoplasmic Reticulum/metabolism
    Chemical Substances Asparagine (7006-34-0) ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8)
    Language English
    Publishing date 2023-11-02
    Publishing country Netherlands
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 60-7
    ISSN 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbamcr.2023.119613
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Helical Membrane Protein Crystallization in the New Era of Electron Cryo-Microscopy.

    Hernando, Mary D / Primeau, Joseph O / Young, Howard S

    Methods in molecular biology (Clifton, N.J.)

    2021  Volume 2302, Page(s) 179–199

    Abstract: Helical assemblies of proteins, which consist of a two-dimensional lattice of identical subunits arranged with helical symmetry, are a common structural motif in nature. For membrane proteins, crystallization protocols can induce helical arrangements and ...

    Abstract Helical assemblies of proteins, which consist of a two-dimensional lattice of identical subunits arranged with helical symmetry, are a common structural motif in nature. For membrane proteins, crystallization protocols can induce helical arrangements and take advantage of the symmetry found in these assemblies for the structural determination of target proteins. Modern advances in the field of electron cryo-microscopy (cryo-EM), in particular the advent of direct electron detectors, have opened the potential for structure determination of membrane proteins in such assemblies at high resolution. The nature of the symmetry in helical crystals of membrane proteins means that a single image potentially contains enough information for three-dimensional structural determination. With the current direct electron detectors, we have never been closer to making this a reality. Here, we present a protocol detailing the preparation of helical crystals, with an emphasis on further cryo-EM analysis and structural determination of the sarco(endo)plasmic reticulum Ca
    MeSH term(s) Algorithms ; Calcium-Binding Proteins/chemistry ; Calcium-Binding Proteins/metabolism ; Computational Biology ; Cryoelectron Microscopy ; Crystallization ; Models, Molecular ; Protein Conformation, alpha-Helical ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/chemistry ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism
    Chemical Substances Calcium-Binding Proteins ; phospholamban ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8)
    Language English
    Publishing date 2021-04-20
    Publishing country United States
    Document type Journal Article
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-0716-1394-8_10
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  6. Article ; Online: Skin cells prefer a slower calcium pump.

    Robia, Seth L / Young, Howard S

    The Journal of biological chemistry

    2018  Volume 293, Issue 11, Page(s) 3890–3891

    Abstract: Naturally occurring mutations of a calcium ion transporter can cause a skin condition known as Darier's disease. In this issue of JBC, ... ...

    Abstract Naturally occurring mutations of a calcium ion transporter can cause a skin condition known as Darier's disease. In this issue of JBC, Mikkelsen
    MeSH term(s) Calcium/metabolism ; Calcium Signaling ; Darier Disease/genetics ; Darier Disease/pathology ; Humans ; Kinetics ; Mutation ; Protein Conformation ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/chemistry ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/genetics ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism
    Chemical Substances Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2018-04-17
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.H118.002088
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  7. Article ; Online: Stimulation of Ca

    Sordi, Giacomo / Goti, Andrea / Young, Howard S / Palchetti, Ilaria / Tadini-Buoninsegni, Francesco

    ChemMedChem

    2021  Volume 16, Issue 21, Page(s) 3293–3299

    Abstract: The sarco(endo)plasmic reticulum ... ...

    Abstract The sarco(endo)plasmic reticulum Ca
    MeSH term(s) Aminoquinolines/chemistry ; Aminoquinolines/pharmacology ; Benzamides/chemistry ; Benzamides/pharmacology ; Dose-Response Relationship, Drug ; Humans ; Molecular Structure ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism ; Small Molecule Libraries/chemistry ; Small Molecule Libraries/pharmacology ; Structure-Activity Relationship
    Chemical Substances Aminoquinolines ; Benzamides ; CDN1163 ; Small Molecule Libraries ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8)
    Language English
    Publishing date 2021-08-26
    Publishing country Germany
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2218496-X
    ISSN 1860-7187 ; 1860-7179
    ISSN (online) 1860-7187
    ISSN 1860-7179
    DOI 10.1002/cmdc.202100350
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  8. Article: Structure-Function Relationship of the SERCA Pump and Its Regulation by Phospholamban and Sarcolipin.

    Gorski, Przemek A / Ceholski, Delaine K / Young, Howard S

    Advances in experimental medicine and biology

    2018  Volume 981, Page(s) 77–119

    Abstract: Calcium is a universal second messenger involved in diverse cellular processes, including excitation-contraction coupling in muscle. The contraction and relaxation of cardiac muscle cells are regulated by the cyclic movement of calcium primarily between ... ...

    Abstract Calcium is a universal second messenger involved in diverse cellular processes, including excitation-contraction coupling in muscle. The contraction and relaxation of cardiac muscle cells are regulated by the cyclic movement of calcium primarily between the extracellular space, the cytoplasm and the sarcoplasmic reticulum (SR). The rapid removal of calcium from the cytosol is primarily facilitated by the sarco(endo)plasmic reticulum calcium ATPase (SERCA) which pumps calcium back into the SR lumen and thereby controls the amount of calcium in the SR. The most studied member of the P-type ATPase family, SERCA has multiple tissue- and cell-specific isoforms and is primarily regulated by two peptides in muscle, phospholamban and sarcolipin. The multifaceted regulation of SERCA via these peptides is exemplified in the biological fine-tuning of their independent oligomerization and regulation. In this chapter, we overview the structure-function relationship of SERCA and its peptide modulators, detailing the regulation of the complexes and summarizing their physiological and disease relevance.
    MeSH term(s) Animals ; Calcium/chemistry ; Calcium/metabolism ; Calcium-Binding Proteins/chemistry ; Calcium-Binding Proteins/metabolism ; Cytosol/chemistry ; Cytosol/metabolism ; Humans ; Muscle Proteins/chemistry ; Muscle Proteins/metabolism ; Organ Specificity ; Proteolipids/chemistry ; Proteolipids/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/chemistry ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism ; Structure-Activity Relationship
    Chemical Substances Calcium-Binding Proteins ; Muscle Proteins ; Proteolipids ; phospholamban ; sarcolipin (145018-73-1) ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2018-03-28
    Publishing country United States
    Document type Journal Article ; Review
    ISSN 2214-8019 ; 0065-2598
    ISSN (online) 2214-8019
    ISSN 0065-2598
    DOI 10.1007/978-3-319-55858-5_5
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  9. Article ; Online: Protein docking and steered molecular dynamics suggest alternative phospholamban-binding sites on the SERCA calcium transporter.

    Alford, Rebecca F / Smolin, Nikolai / Young, Howard S / Gray, Jeffrey J / Robia, Seth L

    The Journal of biological chemistry

    2020  Volume 295, Issue 32, Page(s) 11262–11274

    Abstract: The transport activity of the sarco(endo)plasmic reticulum calcium ATPase (SERCA) in cardiac myocytes is modulated by an inhibitory interaction with a transmembrane peptide, phospholamban (PLB). Previous biochemical studies have revealed that PLB ... ...

    Abstract The transport activity of the sarco(endo)plasmic reticulum calcium ATPase (SERCA) in cardiac myocytes is modulated by an inhibitory interaction with a transmembrane peptide, phospholamban (PLB). Previous biochemical studies have revealed that PLB interacts with a specific inhibitory site on SERCA, and low-resolution structural evidence suggests that PLB interacts with distinct alternative sites on SERCA. High-resolution details of the structural determinants of SERCA regulation have been elusive because of the dynamic nature of the regulatory complex. In this study, we used computational approaches to develop a structural model of SERCA-PLB interactions to gain a mechanistic understanding of PLB-mediated SERCA transport regulation. We combined steered molecular dynamics and membrane protein-protein docking experiments to achieve both a global search and all-atom force calculations to determine the relative affinities of PLB for candidate sites on SERCA. We modeled the binding of PLB to several SERCA conformations, representing different enzymatic states sampled during the calcium transport catalytic cycle. The results of the steered molecular dynamics and docking experiments indicated that the canonical PLB-binding site (comprising transmembrane helices M2, M4, and M9) is the preferred site. This preference was even more stringent for a superinhibitory PLB variant. Interestingly, PLB-binding specificity became more ambivalent for other SERCA conformers. These results provide evidence for polymorphic PLB interactions with novel sites on M3 and with the outside of the SERCA helix M9. Our findings are compatible with previous physical measurements that suggest that PLB interacts with multiple binding sites, conferring dynamic responsiveness to changing physiological conditions.
    MeSH term(s) Animals ; Binding Sites ; Calcium-Binding Proteins/metabolism ; Humans ; Molecular Dynamics Simulation ; Proteins/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism
    Chemical Substances Calcium-Binding Proteins ; Proteins ; phospholamban ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8)
    Language English
    Publishing date 2020-06-17
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.RA120.012948
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  10. Article ; Online: Nothing Regular about the Regulins: Distinct Functional Properties of SERCA Transmembrane Peptide Regulatory Subunits.

    Rathod, Nishadh / Bak, Jessi J / Primeau, Joseph O / Fisher, M'Lynn E / Espinoza-Fonseca, Lennane Michel / Lemieux, Mary Joanne / Young, Howard S

    International journal of molecular sciences

    2021  Volume 22, Issue 16

    Abstract: The sarco-endoplasmic reticulum calcium ATPase (SERCA) is responsible for maintaining calcium homeostasis in all eukaryotic cells by actively transporting calcium from the cytosol into the sarco-endoplasmic reticulum (SR/ER) lumen. Calcium is an ... ...

    Abstract The sarco-endoplasmic reticulum calcium ATPase (SERCA) is responsible for maintaining calcium homeostasis in all eukaryotic cells by actively transporting calcium from the cytosol into the sarco-endoplasmic reticulum (SR/ER) lumen. Calcium is an important signaling ion, and the activity of SERCA is critical for a variety of cellular processes such as muscle contraction, neuronal activity, and energy metabolism. SERCA is regulated by several small transmembrane peptide subunits that are collectively known as the "regulins". Phospholamban (PLN) and sarcolipin (SLN) are the original and most extensively studied members of the regulin family. PLN and SLN inhibit the calcium transport properties of SERCA and they are required for the proper functioning of cardiac and skeletal muscles, respectively. Myoregulin (MLN), dwarf open reading frame (DWORF), endoregulin (ELN), and another-regulin (ALN) are newly discovered tissue-specific regulators of SERCA. Herein, we compare the functional properties of the regulin family of SERCA transmembrane peptide subunits and consider their regulatory mechanisms in the context of the physiological and pathophysiological roles of these peptides. We present new functional data for human MLN, ELN, and ALN, demonstrating that they are inhibitors of SERCA with distinct functional consequences. Molecular modeling and molecular dynamics simulations of SERCA in complex with the transmembrane domains of MLN and ALN provide insights into how differential binding to the so-called inhibitory groove of SERCA-formed by transmembrane helices M2, M6, and M9-can result in distinct functional outcomes.
    MeSH term(s) Animals ; Calcium/metabolism ; Calcium-Binding Proteins/genetics ; Calcium-Binding Proteins/metabolism ; Humans ; Models, Molecular ; Muscle Proteins/genetics ; Muscle Proteins/metabolism ; Proteolipids/genetics ; Proteolipids/metabolism ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/genetics ; Sarcoplasmic Reticulum Calcium-Transporting ATPases/metabolism
    Chemical Substances Calcium-Binding Proteins ; Muscle Proteins ; Proteolipids ; myoregulin, human ; phospholamban ; sarcolipin (145018-73-1) ; Sarcoplasmic Reticulum Calcium-Transporting ATPases (EC 3.6.3.8) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2021-08-18
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms22168891
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