4C97

Cas6 (TTHA0078) H37A mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Evolution of Crispr RNA Recognition and Processing by Cas6 Endonucleases.

Niewoehner, O.Jinek, M.Doudna, J.A.

(2014) Nucleic Acids Res. 42: 1341

  • DOI: 10.1093/nar/gkt922
  • Primary Citation of Related Structures:  4C8Y, 4C8Z, 4C98, 4C9D

  • PubMed Abstract: 
  • In many bacteria and archaea, small RNAs derived from clustered regularly interspaced short palindromic repeats (CRISPRs) associate with CRISPR-associated (Cas) proteins to target foreign DNA for destruction. In Type I and III CRISPR/Cas systems, the ...

    In many bacteria and archaea, small RNAs derived from clustered regularly interspaced short palindromic repeats (CRISPRs) associate with CRISPR-associated (Cas) proteins to target foreign DNA for destruction. In Type I and III CRISPR/Cas systems, the Cas6 family of endoribonucleases generates functional CRISPR-derived RNAs by site-specific cleavage of repeat sequences in precursor transcripts. CRISPR repeats differ widely in both sequence and structure, with varying propensity to form hairpin folds immediately preceding the cleavage site. To investigate the evolution of distinct mechanisms for the recognition of diverse CRISPR repeats by Cas6 enzymes, we determined crystal structures of two Thermus thermophilus Cas6 enzymes both alone and bound to substrate and product RNAs. These structures show how the scaffold common to all Cas6 endonucleases has evolved two binding sites with distinct modes of RNA recognition: one specific for a hairpin fold and the other for a single-stranded 5'-terminal segment preceding the hairpin. These findings explain how divergent Cas6 enzymes have emerged to mediate highly selective pre-CRISPR-derived RNA processing across diverse CRISPR systems.


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA, Howard Hughes Medical Institute, University of California, Berkeley, California 94720, USA, Department of Chemistry, University of California, Berkeley, California 94720, USA and Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CAS6A
A, B
243Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)N/A
Find proteins for Q5SM65 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SM65
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.168 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 73.930α = 90.00
b = 77.450β = 90.00
c = 88.790γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-06
    Type: Initial release
  • Version 1.1: 2013-11-20
    Type: Atomic model, Other
  • Version 1.2: 2014-02-12
    Type: Database references
  • Version 1.3: 2014-07-23
    Type: Atomic model, Other