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Cupulin is a zona pellucida-like domain protein and major component of the cupula from the inner ear

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Item Type:Article
Title:Cupulin is a zona pellucida-like domain protein and major component of the cupula from the inner ear
Creators Name:Dernedde, J. and Weise, C. and Mueller, E.C. and Hagiwara, A. and Bachmann, S. and Suzuki, M. and Reutter, W. and Tauber, R. and Scherer, H.
Abstract:The extracellular membranes of the inner ear are essential constituents to maintain sensory functions, the cupula for sensing torsional movements of the head, the otoconial membrane for sensing linear movements and accelerations like gravity, and the tectorial membrane in the cochlea for hearing. So far a number of structural proteins have been described, but for the gelatinous cupula precise data are missing. Here, we describe for the first time a major proteinogenic component of the cupula structure with an apparent molecular mass of 45 kDa from salmon. Analyses of respective peptides revealed highly conserved amino-acid sequences with identity to zona pellucida-like domain proteins. Immunohistochemistry studies localized the protein in the ampulla of the inner ear from salmon and according to its anatomical appearance we identified this glycoprotein as Cupulin. Future research on structure and function of zona pellucida-like domain proteins will enhance our knowledge of inner ear diseases, like sudden loss of vestibular function and other disturbances.
Keywords:Amino Acid Sequence, Amino Acid Sequence Homology, Avian Proteins, Fish Proteins, Inner Ear, Membrane Proteins, Molecular Sequence Data, Tertiary Protein Structure, Animals, Chickens, Guinea Pigs, Rabbits, Salmon
Source:PLoS ONE
ISSN:1932-6203
Publisher:Public Library of Science (U.S.A.)
Volume:9
Number:11
Page Range:e111917
Date:4 November 2014
Official Publication:https://doi.org/10.1371/journal.pone.0111917
PubMed:View item in PubMed

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