Journal article
Structural modeling of a novel CAPN5 mutation that causes uveitis and neovascular retinal detachment
PloS one, Vol.10(4), pp.e0122352-e0122352
2015
DOI: 10.1371/journal.pone.0122352
PMCID: PMC4391918
PMID: 25856303
Abstract
CAPN5 mutations have been linked to autosomal dominant neovascular inflammatory vitreoretinopathy (ADNIV), a blinding autoimmune eye disease. Here, we link a new CAPN5 mutation to ADNIV and model the three-dimensional structure of the resulting mutant protein. In our study, a kindred with inflammatory vitreoretinopathy was evaluated by clinical eye examinations, DNA sequencing, and protein structural modeling to investigate the disease-causing mutation. Two daughters of an affected mother demonstrated symptoms of stage III ADNIV, with posterior uveitis, cystoid macular edema, intraocular fibrosis, retinal neovascularization, retinal degeneration, and cataract. The women also harbored a novel guanine to thymine (c.750G>T, p.Lys250Asn) missense mutation in exon 6 of CAPN5, a gene that encodes a calcium-activated cysteine protease, calpain-5. Modeling based on the structures of all known calpains revealed the mutation falls within a calcium-sensitive flexible gating loop that controls access to the catalytic groove. Three-dimensional modeling placed the new mutation in a region adjacent to two previously identified disease-causing mutations, all three of which likely disrupt hydrogen bonding within the gating loop, yielding a CAPN5 with altered enzymatic activity. This is the third case of a CAPN5 mutation leading to inherited uveitis and neovascular vitreoretinopathy, suggesting patients with ADNIV features should be tested for CAPN5 mutations. Structural modeling of novel variants can be used to support mechanistic consequences of the disease-causing variants.
Details
- Title: Subtitle
- Structural modeling of a novel CAPN5 mutation that causes uveitis and neovascular retinal detachment
- Creators
- Alexander G Bassuk - Department of Pediatrics, University of Iowa, Iowa City, IA, United States of America; Omics Lab, University of Iowa, Iowa City, IA, United States of AmericaSteven Yeh - Department of Ophthalmology, Emory University School of Medicine, Atlanta, GA, United States of AmericaShu Wu - Omics Lab, University of Iowa, Iowa City, IA, United States of AmericaDaniel F Martin - Cole Eye Institute, Cleveland Clinic, Cleveland, OH, United States of AmericaStephen H Tsang - Bernard & Shirlee Brown Glaucoma Laboratory and Barbara & Donald Jonas Laboratory of Regenerative Medicine, Departments of Ophthalmology and Pathology and Cell Biology, Columbia University, New York, NY, United States of AmericaLokesh Gakhar - Department of Biochemistry, University of Iowa, Iowa City, IA, United States of America; Protein Crystallography Facility, University of Iowa, Iowa City, IA, United States of AmericaVinit B Mahajan - Omics Lab, University of Iowa, Iowa City, IA, United States of America; Department of Ophthalmology and Visual Sciences, University of Iowa, Iowa City, IA, United States of America
- Resource Type
- Journal article
- Publication Details
- PloS one, Vol.10(4), pp.e0122352-e0122352
- DOI
- 10.1371/journal.pone.0122352
- PMID
- 25856303
- PMCID
- PMC4391918
- NLM abbreviation
- PLoS One
- ISSN
- 1932-6203
- eISSN
- 1932-6203
- Publisher
- Public Library of Science; United States
- Grant note
- R01EY016822 / NEI NIH HHS K08EY020530 / NEI NIH HHS K08 EY020530 / NEI NIH HHS R01 EY016822 / NEI NIH HHS R01 EY024665 / NEI NIH HHS
- Language
- English
- Date published
- 2015
- Academic Unit
- Neurology; Stead Family Department of Pediatrics; Iowa Neuroscience Institute; Biochemistry and Molecular Biology; Neurology (Pediatrics); Medicine Administration; Internal Medicine
- Record Identifier
- 9984020792502771
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