Small nuclear ribonucleoprotein-associated proteins B and B'

Definition

Plays a role in pre-mRNA splicing as a core component of the spliceosomal U1, U2, U4 and U5 small nuclear ribonucleoproteins (snRNPs), the building blocks of the spliceosome. Component of both the pre-catalytic spliceosome B complex and activated spliceosome C complexes. Is also a component of the minor U12 spliceosome. As part of the U7 snRNP it is involved in histone pre-mRNA 3'-end processing.

References:

[1]. Xiaofeng Zhang, et al. An Atomic Structure of the Human Spliceosome. Cell. 2017 May 18;169(5):918-929.e14. [Content Brief]

[2]. Dmitry E Agafonov, et al. Molecular architecture of the human U4/U6.U5 tri-snRNP. Science. 2016 Mar 25;351(6280):1416-20. [Content Brief]

[3]. Karl Bertram, et al. Cryo-EM structure of a human spliceosome activated for step 2 of splicing. Nature. 2017 Feb 16;542(7641):318-323. [Content Brief]

[4]. Karl Bertram, et al. Cryo-EM Structure of a Pre-catalytic Human Spliceosome Primed for Activation. Cell. 2017 Aug 10;170(4):701-713.e11. [Content Brief]

[5]. Daniel A Pomeranz Krummel, et al. Crystal structure of human spliceosomal U1 snRNP at 5.5 A resolution. Nature. 2009 Mar 26;458(7237):475-80. [Content Brief]

[6]. Ashwin Chari, et al. An assembly chaperone collaborates with the SMN complex to generate spliceosomal SnRNPs. Cell. 2008 Oct 31;135(3):497-509. [Content Brief]

[7]. Cindy L Will, et al. The human 18S U11/U12 snRNP contains a set of novel proteins not found in the U2-dependent spliceosome. RNA. 2004 Jun;10(6):929-41. [Content Brief]

[8]. Melissa S Jurica, et al. Purification and characterization of native spliceosomes suitable for three-dimensional structural analysis. RNA. 2002 Apr;8(4):426-39. [Content Brief]

[9]. Yasushi Kondo, et al. Crystal structure of human U1 snRNP, a small nuclear ribonucleoprotein particle, reveals the mechanism of 5' splice site recognition. Elife. 2015 Jan 2;4:e04986. [Content Brief]

[10]. Ramesh S Pillai, et al. Unique Sm core structure of U7 snRNPs: assembly by a specialized SMN complex and the role of a new component, Lsm11, in histone RNA processing. Genes Dev. 2003 Sep 15;17(18):2321-33. [Content Brief]

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