3k64

Crystal structure of FBF-2/fem-3 PME complex

spinqualitylabelsall models 3k64, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3k64 is a 2 chain structure with sequence from Caenorhabditis elegans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function FBF2_CAEEL Involved in the control of stem cells and sex determination in the C.elegans hermaphrodite germline. May also play a role in the hermaphrodite germline proliferation and oogenesis. Binds specifically to the regulatory region of fem-3 3'-UTR and mediates the sperm/oocyte switch. Negatively regulates gld-3 expression possibly by directly binding to two sites within the gld-3 isoform B 3'-UTR. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Caenorhabditis elegans fem-3 binding factor (FBF) is a founding member of the PUMILIO/FBF (PUF) family of mRNA regulatory proteins. It regulates multiple mRNAs critical for stem cell maintenance and germline development. Here, we report crystal structures of FBF in complex with 6 different 9-nt RNA sequences, including elements from 4 natural mRNAs. These structures reveal that FBF binds to conserved bases at positions 1-3 and 7-8. The key specificity determinant of FBF vs. other PUF proteins lies in positions 4-6. In FBF/RNA complexes, these bases stack directly with one another and turn away from the RNA-binding surface. A short region of FBF is sufficient to impart its unique specificity and lies directly opposite the flipped bases. We suggest that this region imposes a flattened curvature on the protein; hence, the requirement for the additional nucleotide. The principles of FBF/RNA recognition suggest a general mechanism by which PUF proteins recognize distinct families of RNAs yet exploit very nearly identical atomic contacts in doing so. Structural basis for specific recognition of multiple mRNA targets by a PUF regulatory protein.,Wang Y, Opperman L, Wickens M, Hall TM Proc Natl Acad Sci U S A. 2009 Dec 1;106(48):20186-91. Epub 2009 Nov 9. PMID:19901328 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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