5G2X

Structure a of Group II Intron Complexed with its Reverse Transcriptase


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of a Group II Intron in Complex with its Reverse Transcriptase.

Qu, G.Kaushal, P.S.Wang, J.Shigematsu, H.Piazza, C.L.Agrawal, R.K.Belfort, M.Wang, H.

(2016) Nat Struct Mol Biol 23: 549

  • DOI: 10.1038/nsmb.3220
  • Primary Citation of Related Structures:  
    5G2Y, 5G2X

  • PubMed Abstract: 
  • Bacterial group II introns are large catalytic RNAs related to nuclear spliceosomal introns and eukaryotic retrotransposons. They self-splice, yielding mature RNA, and integrate into DNA as retroelements. A fully active group II intron forms a ribonucleoprotein complex comprising the intron ribozyme and an intron-encoded protein that performs multiple activities including reverse transcription, in which intron RNA is copied into the DNA target ...

    Bacterial group II introns are large catalytic RNAs related to nuclear spliceosomal introns and eukaryotic retrotransposons. They self-splice, yielding mature RNA, and integrate into DNA as retroelements. A fully active group II intron forms a ribonucleoprotein complex comprising the intron ribozyme and an intron-encoded protein that performs multiple activities including reverse transcription, in which intron RNA is copied into the DNA target. Here we report cryo-EM structures of an endogenously spliced Lactococcus lactis group IIA intron in its ribonucleoprotein complex form at 3.8-Å resolution and in its protein-depleted form at 4.5-Å resolution, revealing functional coordination of the intron RNA with the protein. Remarkably, the protein structure reveals a close relationship between the reverse transcriptase catalytic domain and telomerase, whereas the active splicing center resembles the spliceosomal Prp8 protein. These extraordinary similarities hint at intricate ancestral relationships and provide new insights into splicing and retromobility.


    Organizational Affiliation

    Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
GROUP II INTRON-ENCODED PROTEIN LTRAC599Lactococcus cremorisMutation(s): 0 
Gene Names: ltrAmatR
EC: 2.7.7.49 (PDB Primary Data), 3.1 (PDB Primary Data)
Find proteins for P0A3U0 (Lactococcus lactis subsp. cremoris)
Explore P0A3U0 
Go to UniProtKB:  P0A3U0
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
GROUP II INTRONA704Lactococcus lactis
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-R(*CP*AP*CP*AP*UP*CP*CP*AP*UP*AP*AP*CP)-3'B12Lactococcus cremoris
    Experimental Data & Validation

    Experimental Data

    • Method: ELECTRON MICROSCOPY
    • Resolution: 3.80 Å
    • Aggregation State: PARTICLE 
    • Reconstruction Method: SINGLE PARTICLE 

    Structure Validation

    View Full Validation Report



    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2016-05-11
      Type: Initial release
    • Version 1.1: 2016-06-22
      Changes: Database references