Crystal Structure of the 25kDa Subunit of Human Cleavage factor Im in complex with RNA UGUAAA

Experimental Data Snapshot

  • Resolution: 2.07 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

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Structural basis of UGUA recognition by the Nudix protein CFI(m)25 and implications for a regulatory role in mRNA 3' processing.

Yang, Q.Gilmartin, G.M.Doublie, S.

(2010) Proc Natl Acad Sci U S A 107: 10062-10067

  • DOI: https://doi.org/10.1073/pnas.1000848107
  • Primary Citation of Related Structures:  
    3MDG, 3MDI

  • PubMed Abstract: 

    Human Cleavage Factor Im (CFI(m)) is an essential component of the pre-mRNA 3' processing complex that functions in the regulation of poly(A) site selection through the recognition of UGUA sequences upstream of the poly(A) site. Although the highly conserved 25 kDa subunit (CFI(m)25) of the CFI(m) complex possesses a characteristic alpha/beta/alpha Nudix fold, CFI(m)25 has no detectable hydrolase activity. Here we report the crystal structures of the human CFI(m)25 homodimer in complex with UGUAAA and UUGUAU RNA sequences. CFI(m)25 is the first Nudix protein to be reported to bind RNA in a sequence-specific manner. The UGUA sequence contributes to binding specificity through an intramolecular G:A Watson-Crick/sugar-edge base interaction, an unusual pairing previously found to be involved in the binding specificity of the SAM-III riboswitch. The structures, together with mutational data, suggest a novel mechanism for the simultaneous sequence-specific recognition of two UGUA elements within the pre-mRNA. Furthermore, the mutually exclusive binding of RNA and the signaling molecule Ap(4)A (diadenosine tetraphosphate) by CFI(m)25 suggests a potential role for small molecules in the regulation of mRNA 3' processing.

  • Organizational Affiliation

    Department of Microbiology and Molecular Genetics, Stafford Hall, University of Vermont, Burlington, VT 05405, USA.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cleavage and polyadenylation specificity factor subunit 5
A, B
227Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O43809 (Homo sapiens)
Explore O43809 
Go to UniProtKB:  O43809
PHAROS:  O43809
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43809
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
RNA (5'-R(*UP*GP*UP*AP*AP*A)-3')6N/A
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.07 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.362α = 90
b = 72.037β = 90
c = 96.16γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata scaling
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description