Analysis of amyloid-like secondary structure in the Cryab-R120G knock-in mouse model of hereditary cataracts by two-dimensional infrared spectroscopy
| العنوان: | Analysis of amyloid-like secondary structure in the Cryab-R120G knock-in mouse model of hereditary cataracts by two-dimensional infrared spectroscopy |
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| المؤلفون: | Ariel M. Alperstein, Usha P. Andley, Leah N. Makley, Martin T. Zanni, Kathleen S. Molnar, Sidney S. Dicke, Kieran M. Farrell |
| المصدر: | PLoS ONE, Vol 16, Iss 9, p e0257098 (2021) PLoS ONE |
| بيانات النشر: | Public Library of Science (PLoS), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Tissue Fixation, Eye Diseases, Spectrophotometry, Infrared, genetic structures, Protein aggregation, Biochemistry, Protein Structure, Secondary, law.invention, Medical Conditions, law, Medicine and Health Sciences, Macromolecular Structure Analysis, Gene Knock-In Techniques, Protein secondary structure, Eye Lens, Paraffin Embedding, Multidisciplinary, Organic Compounds, Chemistry, Physics, Classical Mechanics, Animal Models, Optical Lenses, Lens (optics), Optical Equipment, Experimental Organism Systems, Physical Sciences, Engineering and Technology, Medicine, Anatomy, Research Article, Protein Structure, Amyloid, Ocular Anatomy, Science, Equipment, Mouse Models, Research and Analysis Methods, Fibril, Vibration, Cataract, Model Organisms, Ocular System, Crystallin, Formaldehyde, Heat shock protein, Lens, Crystalline, Animals, Humans, Molecular Biology, Cataracts, Organic Chemistry, Chemical Compounds, Wild type, Biology and Life Sciences, Proteins, alpha-Crystallin B Chain, Amides, eye diseases, Mice, Inbred C57BL, Ophthalmology, Disease Models, Animal, Lens Disorders, Amyloid Proteins, Animal Studies, Biophysics, Mutant Proteins, sense organs |
| الوصف: | αB-crystallin is a small heat shock protein that forms a heterooligomeric complex with αA-crystallin in the ocular lens. It is also widely distributed in tissues throughout the body and has been linked with neurodegenerative diseases such as Alzheimer’s, where it is associated with amyloid fibrils. Crystallins can form amorphous aggregates in cataracts as well as more structured amyloid-like fibrils. The arginine 120 to glycine (R120G) mutation in αB-crystallin (Cryab-R120G) results in high molecular weight crystallin protein aggregates and loss of the chaperone activity of the protein in vitro, and it is associated with human hereditary cataracts and myopathy. Characterizing the amorphous (unstructured) versus the highly ordered (amyloid fibril) nature of crystallin aggregates is important in understanding their role in disease and important to developing pharmacological treatments for cataracts. We investigated protein secondary structure in wild-type (WT) and Cryab-R120G knock-in mutant mouse lenses using two-dimensional infrared (2DIR) spectroscopy, which has been used to detect amyloid-like fibrils in human lenses and measure UV radiation-induced changes in porcine lenses. Our goal was to compare the aggregated proteins in this mouse lens model to human lenses and evaluate the protein structural relevance of the Cryab-R120G knock-in mouse model to general age-related cataract disease. In the 2DIR spectra, amide I diagonal peak frequencies were red-shifted to smaller wavenumbers in mutant mouse lenses as compared to WT mouse lenses, consistent with an increase in ordered secondary structure. The cross peak frequency and intensity indicated the presence of amyloid in the mutant mouse lenses. While the diagonal and cross peak changes in location and intensity from the 2DIR spectra indicated significant structural differences between the wild type and mutant mouse lenses, these differences were smaller than those found in human lenses; thus, the Cryab-R120G knock-in mouse lenses contain less amyloid-like secondary structure than human lenses. The results of the 2DIR spectroscopy study confirm the presence of amyloid-like secondary structure in Cryab-R120G knock-in mice with cataracts and support the use of this model to study age-related cataract. |
| اللغة: | English |
| تدمد: | 1932-6203 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4125d32036948b5c9e481be75d6f5d8dTest https://doaj.org/article/4c2942701ef94b0dad0b814255bade00Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....4125d32036948b5c9e481be75d6f5d8d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19326203 |
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