1l3k
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(New page: 200px<br /> <applet load="1l3k" size="450" color="white" frame="true" align="right" spinBox="true" caption="1l3k, resolution 1.10Å" /> '''UP1, THE TWO RNA-RE...)
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Revision as of 15:50, 12 November 2007
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UP1, THE TWO RNA-RECOGNITION MOTIF DOMAIN OF HNRNP A1
Overview
The RNA-recognition motif (RRM) is a common and evolutionarily conserved, RNA-binding module. Crystallographic and solution structural studies have, shown that RRMs adopt a compact alpha/beta structure, in which four, antiparallel beta-strands form the major RNA-binding surface. Conserved, aromatic residues in the RRM are located on the surface of the beta-sheet, and are important for RNA binding. To further our understanding of the, structural basis of RRM-nucleic acid interaction, we carried out a high, resolution analysis of UP1, the N-terminal, two-RRM domain of, heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1), whose structure was, previously solved at 1.75-1.9 A resolution. The two RRMs of hnRNP A1 are, closely related but have distinct functions in regulating alternative, pre-mRNA splice site selection. Our present 1.1 A resolution crystal, structure reveals that two conserved solvent-exposed phenylalanines in the, first RRM have alternative side chain conformations. These conformations, are spatially correlated, as the individual amino acids cannot adopt each, of the observed conformations independently. These phenylalanines are, critical for nucleic acid binding and the observed alternative side chain, conformations may serve as a mechanism for regulating nucleic acid binding, by RRM-containing proteins.
About this Structure
1L3K is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Correlated alternative side chain conformations in the RNA-recognition motif of heterogeneous nuclear ribonucleoprotein A1., Vitali J, Ding J, Jiang J, Zhang Y, Krainer AR, Xu RM, Nucleic Acids Res. 2002 Apr 1;30(7):1531-8. PMID:11917013
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