Ribosomal S15 leader
Predicted secondary structure and sequence conservation of S15
Identifiers
SymbolS15
RfamRF00114
Other data
RNA typeCis-reg; leader
Domain(s)Bacteria
SOSO:0005836
PDB structuresPDBe

S15 Ribosomal protein leaders perform an important regulatory function in ribosome biogenesis.[1] They were used as an autoregulatory mechanism to control the concentration of ribosomal proteins S15. The structure is located in the 5′ untranslated regions of mRNAs encoding ribosomal proteins S15 (rpsO). Multiple distinct structural types of S15 ribosomal protein leaders are known in different organisms.

The E. coli ribosomal S15 leader is an RNA element that can form two alternative structures found in the ribosomal S15 protein. One of the two alternate structures is a series of three hairpins, the other includes a pseudoknot.[2][1] This structure causes translational regulation of the S15 protein. Only the final two hairpins are conserved in other species.

Another example for Bacteria was predicted in Flavobacteria.[3] The secondary structure of his putative ribosomal leader consists of a hairpin in most species. However, some species lack this hairpin. Such a lack of apparent secondary structure would be unusual for a ribosomal leader, which makes this candidate ribosomal leader a less certain prediction.[3]

Two examples in Archaea (one in Halobacteria and one in Methanomicrobia) were predicted.[3] In this structure, similarities between the rRNA binding site of the S15 ribosomal protein and the S15 ribosomal protein leader binding site were detected.[3] This suggests that the ribosomal leaders in these organisms function by mimicking the S15 binding site in rRNA.

Predicted secondary structure and sequence conservation of S15 ribosomal protein leader in Archaea. This picture was adapted from a previous publication.[3]

See also

References

  1. 1 2 Meyer MM (March 2018). "rRNA Mimicry in RNA Regulation of Gene Expression". Microbiol Spectr. 6 (2). doi:10.1128/microbiolspec.RWR-0006-2017. PMID 29546840.
  2. ↑ Bénard L, Philippe C, Ehresmann B, Ehresmann C, Portier C (1996). "Pseudoknot and translational control in the expression of the S15 ribosomal protein". Biochimie. 78 (7): 568–576. doi:10.1016/S0300-9084(96)80003-4. PMC 7131963. PMID 8955900.
  3. 1 2 3 4 5 Eckert, I; Weinberg, Z (24 May 2020). "Discovery of 20 novel ribosomal leader candidates in bacteria and archaea". BMC Microbiology. 20 (130): 130. doi:10.1186/s12866-020-01823-6. PMC 7247131. PMID 32448158.


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