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Gene Structure Alternate Splicing Tissue Distribution Cellular Localization and Developmental Expression Pattern of Mouse Deubiquitinating Enzyme Isoforms Usp2-45 and Usp2-69

机译:小鼠去泛素化酶同工型Usp2-45和Usp2-69的基因结构可变剪接组织分布细胞定位和发育表达模式

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摘要

We have identified a novel mouse gene, Usp2, encoding two ubiquitin-specific proteases (USPs) due to alternate splicing of 5′ exons. Usp2-45 consists of 396 amino acids (45.2 kDa), while Usp2-69 is 619 amino acids (69.5 kDa). Usp2-69 results from the splicing of different combinations of untranslated 5′ exons (1A, 1B, 1C) onto exon 1D and the 40-kDa catalytic core (exons 3–13), while Usp2-45 has exon 2 spliced onto the core. The catalytic core contains the highly conserved motifs of the UBP family of deubiquitinating enzymes. We can find no evidence for a reported 41-kDa isoform (UBP41) in any sequence databases. Usp2-69 is able to form a complex with Usp2-45 and with itself. Antibodies raised against the catalytic core recognized a 69-kDa protein, but did not detect a 45-kDa protein in mouse tissues. Using Northern blot, Western blot, and immunohistochemistry, Usp2 expression was observed in many adult and embryonic tissues including testis, heart, skeletal muscle, diaphragm, brain, kidney, liver, pancreas, lung, and skin. Both Usp2 isoforms were localized to the cytoplasm when overexpressed in COS-7 and NIH3T3 cells. The Usp2 expression pattern indicates that this protein might be involved in specific processes in different types of cells, especially those that are differentiating, and that its function is not restricted to a development of a particular organ.
机译:我们已经鉴定出一种新颖的小鼠基因Usp2,由于两个5'外显子的可变剪接,其编码两种泛素特异性蛋白酶(USPs)。 Usp2-45由396个氨基酸(69.5 kDa)组成,包含396个氨基酸(45.2 kDa)。 Usp2-69来自将未翻译的5'外显子(1A,1B,1C)的不同组合剪接到外显子1D和40 kDa催化核心(外显子3–13)上的结果,而Usp2-45的外显子2被剪接到核心上。催化核心包含UBP脱泛素化酶家族的高度保守基序。我们无法在任何序列数据库中找到报道的41 kDa同工型(UBP41)的证据。 Usp2-69能够与Usp2-45及其本身形成复合体。针对催化核心产生的抗体可识别69 kDa的蛋白质,但在小鼠组织中未检测到45 kDa的蛋白质。使用Northern印迹,蛋白质印迹和免疫组织化学,在许多成年和胚胎组织(包括睾丸,心脏,骨骼肌,隔膜,脑,肾,肝,胰腺,肺和皮肤)中观察到了Usp2表达。当在COS-7和NIH3T3细胞中过表达时,两个Usp2亚型都定位于细胞质。 Usp2表达模式表明该蛋白可能参与了不同类型细胞中的特定过程,尤其是那些正在分化的细胞,并且其功能并不局限于特定器官的发育。

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