4X4U

Crystal structure of the A.fulgidus CCA-adding enzyme in complex with a human MenBeta minihelix ending in CCACC

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 

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This is version 1.4 of the entry. See complete history. 


Literature

On-Enzyme Refolding Permits Small RNA and tRNA Surveillance by the CCA-Adding Enzyme.

Kuhn, C.D., Wilusz, J.E., Zheng, Y., Beal, P.A., Joshua-Tor, L.

(2015) Cell 160: 644-658

  • DOI: https://doi.org/10.1016/j.cell.2015.01.005
  • Primary Citation of Related Structures:  
    4X4N, 4X4O, 4X4P, 4X4Q, 4X4R, 4X4S, 4X4T, 4X4U, 4X4V, 4X4W

  • PubMed Abstract: 

    • Transcription in eukaryotes produces a number of long noncoding RNAs (lncRNAs). Two of these, MALAT1 and Menβ, generate a tRNA-like small RNA in addition to the mature lncRNA. The stability of these tRNA-like small RNAs and bona fide tRNAs is monitored by the CCA-adding enzyme ...

    Transcription in eukaryotes produces a number of long noncoding RNAs (lncRNAs). Two of these, MALAT1 and Menβ, generate a tRNA-like small RNA in addition to the mature lncRNA. The stability of these tRNA-like small RNAs and bona fide tRNAs is monitored by the CCA-adding enzyme. Whereas CCA is added to stable tRNAs and tRNA-like transcripts, a second CCA repeat is added to certain unstable transcripts to initiate their degradation. Here, we characterize how these two scenarios are distinguished. Following the first CCA addition cycle, nucleotide binding to the active site triggers a clockwise screw motion, producing torque on the RNA. This ejects stable RNAs, whereas unstable RNAs are refolded while bound to the enzyme and subjected to a second CCA catalytic cycle. Intriguingly, with the CCA-adding enzyme acting as a molecular vise, the RNAs proofread themselves through differential responses to its interrogation between stable and unstable substrates.

    Organizational Affiliation: 

    W.M. Keck Structural Biology Laboratory, Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, USA. Electronic address: leemor@cshl.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CCA-adding enzymeA, C, E, F457Archaeoglobus fulgidus DSM 4304Mutation(s): 0 
Gene Names: cca, AF_2156
EC: 2.7.7.72
UniProt
Find proteins for O28126 (Archaeoglobus fulgidus (strain ATCC 49558 / DSM 4304 / JCM 9628 / NBRC 100126 / VC-16))
Explore O28126 
Go to UniProtKB:  O28126
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO28126
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
human MenBeta minihelixB, D, G37Homo sapiens
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
RNA (5'-D(*GP*G)-3')H2Homo sapiens
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.988α = 90
b = 84.049β = 103.42
c = 135.524γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
PDB_EXTRACTdata extraction
PHASERphasing
PHENIXrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-11
    Type: Initial release
  • Version 1.1: 2015-02-18
    Changes: Database references
  • Version 1.2: 2015-02-25
    Changes: Derived calculations
  • Version 1.3: 2017-11-22
    Changes: Derived calculations, Refinement description, Source and taxonomy
  • Version 1.4: 2019-11-20
    Changes: Author supporting evidence