Peptidyl-tRNA hydrolase ArfB - P40711 (ARFB_ECOLI)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for P40711: 2
Rescues stalled ribosomes (PubMed:21418110, PubMed:21051357, PubMed:22922063). Can hydrolyze peptidyl-tRNA on ribosomes stalled by both non-stop mRNAs and mRNAs that contain rare codon clusters (PubMed:21051357) or ribosomes stalled in the middle of mRNA (PubMed:22922063). First identified as a complementary ribosome rescue system when the stalled ribosome cannot be rescued by the SsrA(tmRNA)-SmpB quality control system or the alternative ribosome-rescue factor A (arfA) (PubMed:21418110). UniProt
Catalytic Activity
N-substituted aminoacyl-tRNA + H2O = N-substituted amino acid + tRNA. UniProt
Pathway Maps
      ESCHER  BiGG
Subunit Structure
Associated with 70S ribosomes and polysomes. UniProt
The unstructured C-terminal region is required for ribosome binding and peptidyl-tRNA hydrolase activity. The C-terminal tail functions as a sensor to discriminate between stalled and actively translating ribosomes by binding in the mRNA entry channel downstream of the A site between the head and shoulder of the 30S subunit. This allows the N-terminal globular domain to sample different conformations, so that its conserved GGQ motif is optimally positioned in the peptidyltransferase center (PTC) to catalyze the hydrolysis of peptidyl-tRNA. The N-terminal domain of ArfB is bound in the A site of the 50S subunit next to the P-site tRNA. UniProt
  • Other Gene names: arfB, yaeJ, b0191, JW0187
This protein in other organisms (by gene name):
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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.
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Validation Track

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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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