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. 1988 May;85(10):3387–3390. doi: 10.1073/pnas.85.10.3387

The 28-kDa calbindin-D is a major calcium-binding protein in the basilar papilla of the chick.

J C Oberholtzer 1, C Buettger 1, M C Summers 1, F M Matschinsky 1
PMCID: PMC280214  PMID: 3368450

Abstract

In previous work we identified a basilar papilla protein (BPP23) that appears to be one of the most abundant soluble proteins in the basilar papilla of the chick cochlea. Here we report the purification of protein BPP23 from chick cochlea and the generation of a specific antiserum. Immunoblotting and immunoprecipitation experiments with this antiserum indicate that BPP23 is a calcium-binding protein very similar, if not identical, to avian calbindin, the 28-kDa vitamin D-dependent calcium-binding protein. Although the basilar papilla contains both receptor hair cells and supporting cells, immunocytochemical studies by others have localized calbindin-like immunoreactivity to the hair cells in the rat auditory receptor epithelium. Our estimates of the abundance of protein BPP23, assuming exclusive localization within the hair cell, indicate a concentration of at least 1 mM. Avian calbindin has four high-affinity (Kd = 0.5 X 10(-6)) calcium-binding sites. The presence of a specific calcium-binding activity at such high levels suggests an important function for cochlear calbindin (BPP23) in hair cell calcium homeostasis and auditory transduction.

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