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30S ribosomal protein S4 - P0A7V8 (RS4_ECOLI)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Number of PDB entries for P0A7V8: 100
 
Function
One of two assembly initiator proteins for the 30S subunit, it binds directly to 16S rRNA where it nucleates assembly of the body of the 30S subunit. (data source: UniProt  )
With S5 and S12 plays an important role in translational accuracy; many suppressors of streptomycin-dependent mutants of protein S12 are found in this protein, some but not all of which decrease translational accuracy (ram, ribosomal ambiguity mutations). (data source: UniProt  )

Plays a role in mRNA unwinding by the ribosome, possibly by forming part of a processivity clamp. (data source: UniProt  )
Protein S4 is also a translational repressor protein, it controls the translation of the alpha-operon (which codes for S13, S11, S4, RNA polymerase alpha subunit, and L17) by binding to its mRNA. (data source: UniProt  )
Also functions as a rho-dependent antiterminator of rRNA transcription, increasing the synthesis of rRNA under conditions of excess protein, allowing a more rapid return to homeostasis. Binds directly to RNA polymerase. (data source: UniProt  )
Subunit structure
Part of the 30S ribosomal subunit. Contacts protein S5. With proteins S3 and S5 encircles the mRNA as it enters the ribosome, which may play a role in mRNA helicase processivity. Some nascent polypeptide chains are able to cross-link to this protein in situ. (data source: UniProt  )
UniProtKB:
Species: 
Gene names: rpsD ramA b3296 JW3258
Length:
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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 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 Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  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).