Otoconin-90, the mammalian otoconial matrix protein, contains two domains of homology to secretory phospholipase A2.

Otoconin-90, the mammalian otoconial matrix protein, contains two domains of homology to secretory phospholipase A2.
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Otoconin-90 是哺乳动物耳锥基质蛋白,包含两个与分泌性磷脂酶 A2 同源的结构域。

DOI:
10.1073/pnas.95.26.15345
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发表时间:
1998
影响因子:
11.1
通讯作者:
Thalmann,R
Thalmann,R
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang,Y;Kowalski,PE;Thalmann,I;Ornitz,DM;Mager,DL;Thalmann,R

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感知相对于重力的方向的能力需要密集的颗粒,称为耳锥,它位于前庭黄斑器官。在哺乳动物中,耳石是由蛋白质(耳石)和方解石晶格中的碳酸钙晶体组成的。耳孔生物合成的调控机制尚不清楚。为了开始阐明这些机制,我们对小鼠耳蜗的主要蛋白成分otoconin-90 (OC90)进行了部分测序和克隆。氨基酸序列鉴定了一个孤儿嵌合人cDNA。由于其与分泌磷脂酶A2(sPLA2)的相似性,该基因被称为aspla2样(PLA2L),并使人类oc90得以鉴定。分离出部分小鼠cDNA和基因组克隆,并在发育中的小鼠耳囊肿中特异性表达。成熟小鼠OC90由453个残基组成,包含两个与sPLA2同源的结构域。oc90的克隆将允许检查这种蛋白质在耳锥体生物合成和影响前庭系统的疾病中的作用。
The ability to sense orientation relative to gravity requires dense particles, called otoconia, which are localized in the vestibular macular organs. In mammals, otoconia are composed of proteins (otoconins) and calcium carbonate crystals in a calcite lattice. Little is known about the mechanisms that regulate otoconial biosynthesis. To begin to elucidate these mechanisms, we have partially sequenced and cloned the major protein component of murine otoconia, otoconin-90 (OC90). The amino acid sequence identified an orphan chimeric human cDNA. Because of its similarity to secretory phospholipase A2(sPLA2), this gene was referred to asPLA2-like (PLA2L)and enabled the identification of humanOc90. Partial murine cDNA and genomic clones were isolated and shown to be specifically expressed in the developing mouse otocyst. The mature mouse OC90 is composed of 453 residues and contains two domains homologous to sPLA2. The cloning ofOc90will allow an examination of the role of this protein in otoconial biosynthesis and in diseases that affect the vestibular system.
含有 16 个半胱氨酸的新型大鼠和小鼠低分子量 Ca(2) 依赖性磷脂酶 A2 的克隆和表征。
DOI: --
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期刊: The Journal of biological chemistry
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