CRISPR system Cmr subunit Cmr5 - Q8U1T0 (CMR5_PYRFU)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q8U1T0: 1
 
Function
CRISPR (clustered regularly interspaced short palindromic repeat), is an adaptive immune system that provides protection against mobile genetic elements (viruses, transposable elements and conjugative plasmids). CRISPR clusters contain sequences complementary to antecedent mobile elements and target invading nucleic acids. CRISPR clusters are transcribed and processed into CRISPR RNA (crRNA), formerly called psiRNA (prokaryotic silencing) in this organism. Part of the Cmr ribonucleoprotein complex which has divalent cation-dependent endoribonuclease activity specific for ssRNA complementary to the crRNA (target NRA), generating 5' hydroxy- and 3' phosphate or 2'-3' cyclic phosphate termini. Cmr4 is probably the subunit that cleaves target RNA (PubMed:25280103). Cmr complex does not cleave ssDNA complementary to the crRNA. Cleavage of invading RNA is guided by the crRNA; substrate cleavage occurs a fixed distance (14 nt) from the 3' end of the crRNA. In vitro reconstitution shows Cmr1-2 and Cmr5 are not absolutely necessary for target cleavage (PubMed:19945378). (data source: UniProt  )
Subunit structure
Monomer in isolation (PubMed:23370277). Part of the type III-B Cmr ribonucleoprotein (RNP) complex, an elongated RNP with Cmr2 and Cmr3 as the base, with Cmr4 and Cmr5 forming a helical core along the mature crRNA (39 or 45 nt in length), while the complex is capped by Cmr6 and Cmr1. The 5' end of the crRNA is bound to Cmr2 and Cmr3, while Cmr6 and a Cmr1 sbunit (Cmr1-1 or Cmr1-2) cap the 3' end of the crRNA. The target RNA lies antiparallel to the crRNA, with its 5' end near Cmr1 and Cmr6 and its 3' end near Cmr2 and Cmr3; major target cleavage occurs nears the junction of Cmr1/Cmr6 and Cmr4/Cmr, with minor cleavage occurring at 6 nt intervals which coincide with the proposed spacing of Cmr4 subunits (PubMed:24119404, PubMed:25280103). Interacts with Cmr4 (PubMed:23370277). Interacts with Cmr2, Cmr4 and Cmr6 (PubMed:25280103). (data source: UniProt  )
UniProtKB:
Length:
Other Gene names: cmr5 PF1125
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Data origin/color codes
The vertical color bar on the left side indicates data provenance.
Data in green originates from UniProtKB  
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
Data in red indicates combined ranges of Homology Models from SBKB   and the Protein Model Portal  
The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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