2mz1
From Proteopedia
Solution structure of hnRNP C RRM in complex with 5'-UUUUC-3' RNA
Structural highlights
FunctionHNRPC_HUMAN Binds pre-mRNA and nucleates the assembly of 40S hnRNP particles. Single HNRNPC tetramers bind 230-240 nucleotides. Trimers of HNRNPC tetramers bind 700 nucleotides. May play a role in the early steps of spliceosome assembly and pre-mRNA splicing. Interacts with poly-U tracts in the 3'-UTR or 5'-UTR of mRNA and modulates the stability and the level of translation of bound mRNA molecules.[1] [2] [3] [4] Publication Abstract from PubMedHnRNP C is a ubiquitous RNA regulatory factor and the principal constituent of the nuclear hnRNP core particle. The protein contains one amino-terminal RNA recognition motif (RRM) known to bind uridine (U)-rich sequences. This work provides a molecular and mechanistic understanding of this interaction. We solved the solution structures of the RRM in complex with poly(U) oligomers of five and seven nucleotides. The five binding pockets of RRM recognize uridines with an unusual 5'-to-3' gradient of base selectivity. The target recognition is therefore strongly sensitive to base clustering, explaining the preference for contiguous uridine tracts. Using a novel approach integrating the structurally derived recognition consensus of the RRM with a thermodynamic description of its multi-register binding, we modeled the saturation of cellular uridine tracts by this protein. The binding pattern is remarkably consistent with the experimentally observed transcriptome-wide cross-link distribution of the full-length hnRNP C on short uridine tracts. This result re-establishes the RRM as the primary RNA-binding domain of the hnRNP C tetramer and provides a proof of concept for interpreting high-throughput interaction data using structural approaches. Structural and mechanistic insights into poly(uridine) tract recognition by the hnRNP C RNA recognition motif.,Cienikova Z, Damberger FF, Hall J, Allain FH, Maris C J Am Chem Soc. 2014 Oct 15;136(41):14536-44. doi: 10.1021/ja507690d. Epub 2014, Sep 30. PMID:25216038[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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