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ANS Interacts with the Ca 2+-ATPase Nucleotide Binding Site. J Fluoresc 2020; 30:483-496. [PMID: 32146650 DOI: 10.1007/s10895-020-02518-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 02/14/2020] [Indexed: 10/24/2022]
Abstract
The binding of 8-anilino-1-naphthalene sulfonate (ANS) to the nucleotide binding domain (N-domain) of the sarcoplasmic reticulum Ca2+-ATPase (SERCA) was studied. Molecular docking predicted two ANS binding modes (BMI and BMII) in the nucleotide binding site. The molecular interaction was confirmed as the fluorescence intensity of ANS was dramatically increased when in the presence of an engineered recombinant N-domain. Molecular dynamics simulation showed BMI (which occupies the ATP binding site) as the mode that is stable in solution. The above was confirmed by the absence of ANS fluorescence in the presence of a fluorescein isothiocyanate (FITC)-labeled N-domain. Further, the labeling of the N-domain with FITC was hindered by the presence of ANS, i.e., ANS was bound to the ATP binding site. Importantly, ANS displayed a higher affinity than ATP. In addition, ANS binding led to quenching the N-domain intrinsic fluorescence displaying a FRET pattern, which suggested the existence of a Trp-ANS FRET couple. Nonetheless, the chemical modification of the sole Trp residue with N-bromosuccinimide (NBS) discarded the existence of FRET and instead indicated structural rearrangements in the nucleotide binding site during ANS binding. Finally, Ca2+-ATPase kinetics in the presence of ANS showed a partial mixed-type inhibition. The Dixon plot showed the ANS-Ca2+-ATPase complex as catalytically active, hence supporting the existence of a functional dimeric Ca2+-ATPase in sarcoplasmic reticulum vesicles. ANS may be used as a molecular platform for the development of more effective inhibitors of Ca2+-ATPase and appears to be a new fluorescent probe for the nucleotide binding site. Graphical Abstract Molecular docking of ANS to the nucleotide binding site of Ca2+-ATPase. ANS fluorescence increase reveals molecular interaction.
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Quan C, Li M, Du Q, Chen Q, Wang H, Campbell D, Fang L, Xue B, MacKintosh C, Gao X, Ouyang K, Wang HY, Chen S. SPEG Controls Calcium Reuptake Into the Sarcoplasmic Reticulum Through Regulating SERCA2a by Its Second Kinase-Domain. Circ Res 2019; 124:712-726. [PMID: 30566039 DOI: 10.1161/circresaha.118.313916] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
RATIONALE SPEG (Striated muscle preferentially expressed protein kinase) has 2 kinase-domains and is critical for cardiac development and function. However, it is not clear how these 2 kinase-domains function to maintain cardiac performance. OBJECTIVE To determine the molecular functions of the 2 kinase-domains of SPEG. METHODS AND RESULTS A proteomics approach identified SERCA2a (sarcoplasmic/endoplasmic reticulum calcium ATPase 2a) as a protein interacting with the second kinase-domain but not the first kinase-domain of SPEG. Furthermore, the second kinase-domain of SPEG could phosphorylate Thr484 on SERCA2a, promote its oligomerization and increase calcium reuptake into the sarcoplasmic/endoplasmic reticulum in culture cells and primary neonatal rat cardiomyocytes. Phosphorylation of SERCA2a by SPEG enhanced its calcium-transporting activity without affecting its ATPase activity. Depletion of Speg in neonatal rat cardiomyocytes inhibited SERCA2a-Thr484 phosphorylation and sarcoplasmic reticulum calcium reuptake. Moreover, overexpression of SERCA2aThr484Ala mutant protein also slowed sarcoplasmic reticulum calcium reuptake in neonatal rat cardiomyocytes. In contrast, domain mapping and phosphorylation analysis revealed that the first kinase-domain of SPEG interacted and phosphorylated its recently identified substrate JPH2 (junctophilin-2). An inducible heart-specific Speg knockout mouse model was generated to further study this SPEG-SERCA2a signal nexus in vivo. Inducible deletion of Speg decreased SERCA2a-Thr484 phosphorylation and its oligomerization in the heart. Importantly, inducible deletion of Speg inhibited SERCA2a calcium-transporting activity and impaired calcium reuptake into the sarcoplasmic reticulum in cardiomyocytes, which preceded morphological and functional alterations of the heart and eventually led to heart failure in adult mice. CONCLUSIONS Our data demonstrate that the 2 kinase-domains of SPEG may play distinct roles to regulate cardiac function. The second kinase-domain of SPEG is a critical regulator for SERCA2a. Our findings suggest that SPEG may serve as a new target to modulate SERCA2a activation for treatment of heart diseases with impaired calcium homeostasis.
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Affiliation(s)
- Chao Quan
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
| | - Min Li
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
| | - Qian Du
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
| | - Qiaoli Chen
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
| | - Hong Wang
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University, Shenzhen, China (H.W., K.F.O.Y.)
| | - David Campbell
- MRC Protein Phosphorylation and Ubiquitylation Unit (D.C.), School of Life Sciences, University of Dundee, Scotland, United Kingdom
| | - Lei Fang
- School of Medicine (L.F., B.X.), Nanjing University, China
| | - Bin Xue
- School of Medicine (L.F., B.X.), Nanjing University, China
| | - Carol MacKintosh
- Division of Cell and Developmental Biology (C.M.), School of Life Sciences, University of Dundee, Scotland, United Kingdom
| | - Xiang Gao
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
| | - Kunfu Ouyang
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University, Shenzhen, China (H.W., K.F.O.Y.)
| | - Hong Yu Wang
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
| | - Shuai Chen
- From the State Key Laboratory of Pharmaceutical Biotechnology, Department of Cardiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Model Animal Research Center (C.Q., M.L., Q.D., Q.L.C., X.G., H.Y.W., S.C.), Nanjing University, China
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Kamrul Huda KM, Akhter Banu MS, Yadav S, Sahoo RK, Tuteja R, Tuteja N. Salinity and drought tolerant OsACA6 enhances cold tolerance in transgenic tobacco by interacting with stress-inducible proteins. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2014; 82:229-38. [PMID: 24992889 DOI: 10.1016/j.plaphy.2014.06.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Accepted: 06/03/2014] [Indexed: 05/04/2023]
Abstract
Plant Ca(2+)ATPases regulate many signalling pathways which are important for plant growth, development and abiotic stress responses. Our previous work identified that overexpression of OsACA6 confers salinity and drought tolerance in tobacco. In the present work we report, the function of OsACA6 in cold stress tolerance in transgenic tobacco plants. The expression of OsACA6 was induced by cold stress. The promoter-GUS fusion analyses in the different tissues of transgenic tobacoco confirmed that OsACA6 promoter is cold stress-inducible. Transgenic tobacco plants overexpressing OsACA6 exhibited cold tolerance compared to the wild type (WT) controls. The enhanced tolerance was confirmed by phenotypic analyses as well as by measuring germination, survival rate, chlorophyll content, cell membrane stability, malondialdehyde and proline content. Compared to the WT, the expression of catalase, ascorbate peroxidase and superoxide dismutase increased in the OsACA6 overexpressing plants, which was inversely correlated with the levels of H2O2 in the transgenic lines. We also identified interacting proteins of OsACA6 by using yeast two-hybrid screening assay. Most of the interacting partners of OsACA6 are associated with the widespread biological processes including plant growth, development, signalling and stress adaptation. Furthermore, we also confirmed that OsACA6 is able to self-interact. Overall, these results suggest that OsACA6 plays an important role in cold tolerance at least in part, by regulating antioxidants-mediated removal of reactive oxygen species or by interacting with different calcium signal decoders including calmodulin-like proteins (CaM) calcium/calmodulin dependent protein kinases (CDPKs) and receptor-like protein kinases (RLKs).
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Affiliation(s)
- Kazi Md Kamrul Huda
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Mst Sufara Akhter Banu
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Sandep Yadav
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Ranjan Kumar Sahoo
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Renu Tuteja
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Narendra Tuteja
- International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India.
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Wang Y, Itaya A, Zhong X, Wu Y, Zhang J, van der Knaap E, Olmstead R, Qi Y, Ding B. Function and evolution of a MicroRNA that regulates a Ca2+-ATPase and triggers the formation of phased small interfering RNAs in tomato reproductive growth. THE PLANT CELL 2011; 23:3185-203. [PMID: 21917547 PMCID: PMC3203446 DOI: 10.1105/tpc.111.088013] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Revised: 08/12/2011] [Accepted: 08/26/2011] [Indexed: 05/18/2023]
Abstract
MicroRNAs (miRNAs) regulate a wide variety of biological processes in most eukaryotes. We investigated the function and evolution of miR4376 in the family Solanaceae. We report that the 22-nucleotide miR4376 regulates the expression of an autoinhibited Ca(2+)-ATPase, tomato (Solanum lycopersicum) ACA10, which plays a critical role in tomato reproductive growth. Deep phylogenetic mapping suggested (1) an evolution course of MIR4376 loci and posttranscriptional processing of pre-miR4376 as a likely limiting step for the evolution of miR4376, (2) an independent phylogenetic origin of the miR4376 target site in ACA10 homologs, and (3) alternative splicing as a possible mechanism of eliminating such a target in some ACA10 homologs. Furthermore, miR4376 triggers the formation of phased small interfering RNAs (siRNAs) from Sl ACA10 and its Solanum tuberosum homolog. Together, our data provide experimental evidence of miRNA-regulated expression of universally important Ca(2+)-ATPases. The miR4376-regulated expression of ACA10 itself, and possibly also the associated formation of phased siRNAs, may function as a novel layer of molecular mechanisms underlying tomato reproductive growth. Finally, our data suggest that the stochastic emergence of a miRNA-target gene combination involves multiple molecular events at the genomic, transcriptional, and posttranscriptional levels that may vary drastically in even closely related species.
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Affiliation(s)
- Ying Wang
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
| | - Asuka Itaya
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
| | - Xuehua Zhong
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
| | - Yang Wu
- National Institute of Biological Sciences, 102206 Beijing, China
| | - Jianfeng Zhang
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
| | - Esther van der Knaap
- Department of Horticulture and Crop Science, Ohio State University/Ohio Agricultural Research and Development Center, Wooster, Ohio 44691
| | - Richard Olmstead
- Burke Museum, Department of Biology, University of Washington, Seattle, Washington 98195
| | - Yijun Qi
- National Institute of Biological Sciences, 102206 Beijing, China
| | - Biao Ding
- Department of Molecular Genetics, Ohio State University, Columbus, Ohio 43210
- Molecular, Cellular, and Developmental Biology Program, Ohio State University, Columbus, Ohio 43210
- Center for RNA Biology, Ohio State University, Columbus, Ohio 43210
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Huc-Brandt S, Marcellin D, Graslin F, Averseng O, Bellanger L, Hivin P, Quemeneur E, Basquin C, Navarro V, Pourcher T, Darrouzet E. Characterisation of the purified human sodium/iodide symporter reveals that the protein is mainly present in a dimeric form and permits the detailed study of a native C-terminal fragment. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1808:65-77. [PMID: 20797386 DOI: 10.1016/j.bbamem.2010.08.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 08/16/2010] [Accepted: 08/18/2010] [Indexed: 12/31/2022]
Abstract
The sodium/iodide symporter is an intrinsic membrane protein that actively transports iodide into thyroid follicular cells. It is a key element in thyroid hormone biosynthesis and in the radiotherapy of thyroid tumours and their metastases. Sodium/iodide symporter is a very hydrophobic protein that belongs to the family of sodium/solute symporters. As for many other membrane proteins, particularly mammalian ones, little is known about its biochemistry and structure. It is predicted to contain 13 transmembrane helices, with an N-terminus oriented extracellularly. The C-terminal, cytosolic domain contains approximately one hundred amino acid residues and bears most of the transporter's putative regulatory sites (phosphorylation, sumoylation, di-acide, di-leucine or PDZ-binding motifs). In this study, we report the establishment of eukaryotic cell lines stably expressing various human sodium/iodide symporter recombinant proteins, and the development of a purification protocol which allowed us to purify milligram quantities of the human transporter. The quaternary structure of membrane transporters is considered to be essential for their function and regulation. Here, the oligomeric state of human sodium/iodide symporter was analysed for the first time using purified protein, by size exclusion chromatography and light scattering spectroscopy, revealing that the protein exists mainly as a dimer which is stabilised by a disulfide bridge. In addition, the existence of a sodium/iodide symporter C-terminal fragment interacting with the protein was also highlighted. We have shown that this fragment exists in various species and cell types, and demonstrated that it contains the amino-acids [512-643] from the human sodium/iodide symporter protein and, therefore, the last predicted transmembrane helix. Expression of either the [1-512] truncated domain or the [512-643] domain alone, as well as co-expression of the two fragments, was performed, and revealed that co-expression of [1-512] with [512-643] allowed the reconstitution of a functional protein. These findings constitute an important step towards an understanding of some of the post-translational mechanisms that finely tune iodide accumulation through human sodium/iodide symporter regulation.
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Affiliation(s)
- Sylvaine Huc-Brandt
- CEA, iBEB, SBTN, Centre de Marcoule, Bat 170, BP17171, 30207 Bagnols sur Cèze, CEDEX, France.
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