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Li C, Willegems K, Uchański T, Pardon E, Steyaert J, Efremov RG. Rapid small-scale nanobody-assisted purification of ryanodine receptors for cryo-EM. J Biol Chem 2024:107734. [PMID: 39233227 DOI: 10.1016/j.jbc.2024.107734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 07/05/2024] [Accepted: 08/19/2024] [Indexed: 09/06/2024] Open
Abstract
Ryanodine receptors (RyRs) are large Ca2+ release channels residing in the endoplasmic or sarcoplasmic reticulum membrane. Three isoforms of RyRs have been identified in mammals, the disfunction of which has been associated with a series of life-threatening diseases. The need for large amounts of native tissue or eukaryotic cell cultures limits advances in structural studies of RyRs. Here, we report a method that utilizes nanobodies to purify RyRs from only 5 mg of total protein. The purification process, from isolated membranes to cryo-EM grade protein, is achieved within four hours on the bench, yielding protein usable for cryo-EM analysis. This is demonstrated by solving the structures of rabbit RyR1, solubilized in detergent, reconstituted into lipid nanodiscs or liposomes, and bovine RyR2 reconstituted in nanodisc, and mouse RyR2 in detergent. The reported method facilitates structural studies of RyRs directed toward drug development and is useful in cases where the amount of starting material is limited.
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Affiliation(s)
- Chenyao Li
- Center for Structural Biology, Vlaams Instituut voor Biotechnologie, 1050, Brussels, Belgium; Structural Biology Brussels, Department of Bioengineering Sciences, VUB, 1050, Brussels, Belgium
| | - Katrien Willegems
- Center for Structural Biology, Vlaams Instituut voor Biotechnologie, 1050, Brussels, Belgium; Structural Biology Brussels, Department of Bioengineering Sciences, VUB, 1050, Brussels, Belgium
| | - Tomasz Uchański
- Center for Structural Biology, Vlaams Instituut voor Biotechnologie, 1050, Brussels, Belgium; Structural Biology Brussels, Department of Bioengineering Sciences, VUB, 1050, Brussels, Belgium
| | - Els Pardon
- Center for Structural Biology, Vlaams Instituut voor Biotechnologie, 1050, Brussels, Belgium; Structural Biology Brussels, Department of Bioengineering Sciences, VUB, 1050, Brussels, Belgium
| | - Jan Steyaert
- Center for Structural Biology, Vlaams Instituut voor Biotechnologie, 1050, Brussels, Belgium; Structural Biology Brussels, Department of Bioengineering Sciences, VUB, 1050, Brussels, Belgium
| | - Rouslan G Efremov
- Center for Structural Biology, Vlaams Instituut voor Biotechnologie, 1050, Brussels, Belgium; Structural Biology Brussels, Department of Bioengineering Sciences, VUB, 1050, Brussels, Belgium.
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Multiminicore disease with respiratory failure. Pediatr Neurol 2011; 44:295-8. [PMID: 21397173 DOI: 10.1016/j.pediatrneurol.2010.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2010] [Revised: 08/18/2010] [Accepted: 11/15/2010] [Indexed: 11/22/2022]
Abstract
Multiminicore disease is a rare form of slowly progressive or nonprogressive myopathy, characterized by multiple cores within the muscle fibers. Respiratory failure in multiminicore disease rarely occurs. We describe a 5-year-old girl with multiminicore disease and early-onset respiratory failure after an episode of bronchopneumonia. The child received mechanical ventilation for 280 days and was discharged on home ventilation. The relevant literature is reviewed.
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Kawashima H, Ishii C, Yamanaka G, Ioi H, Nishimata S, Kashiwagi Y, Takekuma K, Miyajima T, Hoshika A, Nishino I, Nonaka I. Myopathy and neurogenic muscular atrophy in unexpected cardiopulmonary arrest. Pediatr Int 2011; 53:159-61. [PMID: 21501304 DOI: 10.1111/j.1442-200x.2010.03211.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Neuromuscular disorders can be the cause of sudden death of infants because of their weakness and gastroesophageal reflux (GER). METHODS Muscle biopsy and genetic studies were performed by usual method. RESULTS In this report four cases of infants with neuromuscular disorders (two cases of congenital myopathy and two cases of spinal muscular atrophy) who had unexpected cardiopulmonary arrest on arrival (CPAOA) are presented. Two of the cases did not show any symptoms, such as muscle weakness prior to CPAOA. The diagnosis was based on the results of the muscle biopsy and genetic examination. CONCLUSION These results suggest that sudden infant death caused by neuromuscular disorders should be considered.
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Affiliation(s)
- Hisashi Kawashima
- Department of Pediatrics, Tokyo Medical University Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo, Japan.
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Lanner JT, Georgiou DK, Joshi AD, Hamilton SL. Ryanodine receptors: structure, expression, molecular details, and function in calcium release. Cold Spring Harb Perspect Biol 2010; 2:a003996. [PMID: 20961976 DOI: 10.1101/cshperspect.a003996] [Citation(s) in RCA: 540] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Ryanodine receptors (RyRs) are located in the sarcoplasmic/endoplasmic reticulum membrane and are responsible for the release of Ca(2+) from intracellular stores during excitation-contraction coupling in both cardiac and skeletal muscle. RyRs are the largest known ion channels (> 2MDa) and exist as three mammalian isoforms (RyR 1-3), all of which are homotetrameric proteins that interact with and are regulated by phosphorylation, redox modifications, and a variety of small proteins and ions. Most RyR channel modulators interact with the large cytoplasmic domain whereas the carboxy-terminal portion of the protein forms the ion-conducting pore. Mutations in RyR2 are associated with human disorders such as catecholaminergic polymorphic ventricular tachycardia whereas mutations in RyR1 underlie diseases such as central core disease and malignant hyperthermia. This chapter examines the current concepts of the structure, function and regulation of RyRs and assesses the current state of understanding of their roles in associated disorders.
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Affiliation(s)
- Johanna T Lanner
- Baylor College of Medicine, Department of Molecular Physiology and Biophysics, Houston, Texas 77030,USA
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Sharma MC, Jain D, Sarkar C, Goebel HH. Congenital myopathies--a comprehensive update of recent advancements. Acta Neurol Scand 2009; 119:281-92. [PMID: 19133863 DOI: 10.1111/j.1600-0404.2008.01126.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The congenital myopathies are relatively newly discovered compared with other categories of muscle diseases. Current research continues to clarify and classify the congenital myopathies. These pose a diagnostic problem and cannot be diagnosed by routine hematoxylin and eosin stain. A lot of special techniques are required to diagnose them correctly and it's various subtypes. The disease specific structural changes seen in the muscle are detected by enzyme histochemistry, immunohistochemistry and electron microscopy. Through this review we provide an up-to-date analysis of congenital myopathies including clinical and pathologic aspects.
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Affiliation(s)
- M C Sharma
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India.
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Sriram KB, Thornton A, Antic R. Spontaneous mode non-invasive ventilation fails to treat respiratory failure in a patient with Multi-mincore disease: a case report. CASES JOURNAL 2008; 1:93. [PMID: 18706078 PMCID: PMC2527491 DOI: 10.1186/1757-1626-1-93] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Accepted: 08/15/2008] [Indexed: 11/23/2022]
Abstract
The increased morbidity and mortality resulting from respiratory failure in patients with neuromuscular disorders and/or kyphoscoliosis can be reversed with non-invasive ventilation. Spontaneous mode bilevel pressure ventilation is preferred to other modes of ventilation, due to relative ease of use, but may not be suitable for all patients. We report a 27-year old woman with Multi-minicore disease whose respiratory failure was refractory to spontaneous mode bilevel pressure ventilation. When we altered settings and provided mandatory inspiratory rise time and respiratory rate, it augmented her respiratory efforts and improved ventilation. Our case report describes the benefit of individualising non-invasive ventilation in the management of respiratory failure due to neuromuscular weakness and kyphoscoliosis.
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Affiliation(s)
- Krishna B Sriram
- Sleep Disorders Service, Department of Thoracic Medicine, Royal Adelaide Hospital, Adelaide, Australia.
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