Characterization of U2AF6, a Splicing Factor Related to U2AF35

Characterization of U2AF6, a Splicing Factor Related to U2AF35
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U2AF6(与 U2AF35 相关的剪接因子)的表征

DOI:
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发表时间:
2002
影响因子:
5.3
通讯作者:
B. Graveley
B. Graveley
中科院分区:
生物学2区
文献类型:
--
作者:
J. Shepard;M. Reick;S. Olson;B. Graveley

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必需剪接因子U2 AF(U2辅助因子)是由65-kDa(U2 AF 65)和35-kDa(U2 AF 35)亚基组成的异源二聚体。U2 AF 35在前体mRNA剪接中具有多种功能。首先,U2 AF 35已被证明通过在3′剪接位点与AG直接相互作用而发挥作用。其次,U2 AF 35被认为在增强子依赖性剪接中通过富含丝氨酸-精氨酸(SR)蛋白募集U2 AF 65中发挥作用。已经提出,U2 AF 35的富含丝氨酸-丝氨酸(RS)结构域与SR蛋白之间的物理相互作用对于该活性是重要的。然而,其他数据表明,情况可能并非如此。在这里,我们报告的哺乳动物基因,编码一个26 kDa的蛋白具有很强的序列相似性U2 AF 35,指定U2 AF 26的鉴定。U2 AF 35和U2 AF 26的N-末端187个氨基酸几乎相同。然而,U2 AF 26的C-末端结构域缺乏U2 AF 35 RS结构域的许多特征,因此可能无法与SR蛋白相互作用。我们发现,U2 AF 26可以与U2 AF 65,并可以在组成型和增强子依赖性剪接的功能取代U2 AF 35,表明小U2 AF亚基的RS域是不需要的剪接增强子功能。最后,我们发现U2 AF 26通过增强U2 AF 65与弱3′剪接位点的结合来发挥功能。这些研究确定U2 AF 26作为哺乳动物剪接因子,并证明不同的U2 AF复合物可以参与前mRNA剪接。基于其序列和功能与U2 AF 35的相似性,U2 AF 26可能在调节可变剪接中发挥作用。
ABSTRACT The essential splicing factor U2AF (U2 auxiliary factor) is a heterodimer composed of 65-kDa (U2AF65) and 35-kDa (U2AF35) subunits. U2AF35 has multiple functions in pre-mRNA splicing. First, U2AF35 has been shown to function by directly interacting with the AG at the 3′ splice site. Second, U2AF35 is thought to play a role in the recruitment of U2AF65 by serine-arginine-rich (SR) proteins in enhancer-dependent splicing. It has been proposed that the physical interaction between the arginine-serine-rich (RS) domain of U2AF35 and SR proteins is important for this activity. However, other data suggest that this may not be the case. Here, we report the identification of a mammalian gene that encodes a 26-kDa protein bearing strong sequence similarity to U2AF35, designated U2AF26. The N-terminal 187 amino acids of U2AF35 and U2AF26 are nearly identical. However, the C-terminal domain of U2AF26 lacks many characteristics of the U2AF35 RS domain and, therefore, might be incapable of interacting with SR proteins. We show that U2AF26 can associate with U2AF65 and can functionally substitute for U2AF35 in both constitutive and enhancer-dependent splicing, demonstrating that the RS domain of the small U2AF subunit is not required for splicing enhancer function. Finally, we show that U2AF26 functions by enhancing the binding of U2AF65 to weak 3′ splice sites. These studies identify U2AF26 as a mammalian splicing factor and demonstrate that distinct U2AF complexes can participate in pre-mRNA splicing. Based on its sequence and functional similarity to U2AF35, U2AF26 may play a role in regulating alternative splicing.
剪接因子 U2AF 的小亚基在裂殖酵母中是保守的。
DOI: 10.1093/nar/24.10.1849
发表时间: 1996
影响因子: 14.9
作者:
Wentz-Hunter,K;Potashkin,J
通讯作者: Potashkin,J
DOI: 10.1126/science.8211184
发表时间: 1993-10-22
期刊: SCIENCE
影响因子: 56.9
作者:
POTASHKIN, J;NAIK, K;WENTZHUNTER, K
通讯作者: WENTZHUNTER, K
DOI: 10.1017/s1355838299982225
发表时间: 1999-04
期刊: RNA
影响因子: 4.5
作者:
D. Zorio;T. Blumenthal
通讯作者: D. Zorio;T. Blumenthal
DOI: 10.1021/bi00502a006
发表时间: 1990-12
期刊: Biochemistry
影响因子: 2.9
作者:
G. W. Witherell;H. Wu;O. Uhlenbeck
通讯作者: G. W. Witherell;H. Wu;O. Uhlenbeck
内在的 U2AF 结合受到外显子增强子信号的调节,同时剪接活性也发生变化。
DOI: --
发表时间: 1995
期刊: RNA (New York, N.Y.)
影响因子: --
作者:
Wang,Z;Hoffmann,HM;Grabowski,PJ
通讯作者: Grabowski,PJ