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1i9x

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{{STRUCTURE_1i9x| PDB=1i9x | SCENE= }}
{{STRUCTURE_1i9x| PDB=1i9x | SCENE= }}
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'''CRYSTAL STRUCTURE OF BPS-U2 SNRNA DUPLEX'''
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===CRYSTAL STRUCTURE OF BPS-U2 SNRNA DUPLEX===
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==Overview==
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Bulged nucleotides play a variety of important roles in RNA structure and function, frequently forming tertiary interactions and sometimes even participating in RNA catalysis. In pre-mRNA splicing, the U2 snRNA base pairs with the intron branchpoint sequence (BPS) to form a short RNA duplex that contains a bulged adenosine that ultimately serves as the nucleophile that attacks the 5' splice site. We have determined a 2.18-A resolution crystal structure of a self-complementary RNA designed to mimic the highly conserved yeast (Saccharomyces cerevisiae) branchpoint sequence (5'-UACUAACGUAGUA with the BPS italicized and the branchsite adenosine underlined) base paired with its complementary sequence from U2 snRNA. The structure shows a nearly ideal A-form helix from which two unpaired adenosines flip out. Although the adenosine adjacent to the branchsite adenosine is the one bulged out in the structure described here, either of these adenosines can serve as the nucleophile in mammalian but not in yeast pre-mRNA splicing. In addition, the packing of the bulged RNA helices within the crystal reveals a novel RNA tertiary interaction in which three RNA helices interact through bulged adenosines in the absence of any divalent metal ions.
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(as it appears on PubMed at http://www.pubmed.gov), where 11350032 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11350032}}
==About this Structure==
==About this Structure==
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[[Category: Pre-mrna splicing]]
[[Category: Pre-mrna splicing]]
[[Category: Three helix junction]]
[[Category: Three helix junction]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:45:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:38:44 2008''

Revision as of 07:38, 1 July 2008

Image:1i9x.png

Template:STRUCTURE 1i9x

CRYSTAL STRUCTURE OF BPS-U2 SNRNA DUPLEX

Template:ABSTRACT PUBMED 11350032

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structure of a model branchpoint-U2 snRNA duplex containing bulged adenosines., Berglund JA, Rosbash M, Schultz SC, RNA. 2001 May;7(5):682-91. PMID:11350032

Page seeded by OCA on Tue Jul 1 10:38:44 2008

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