RAGATH RNA motifs

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RAGATH-8
RF02687.svg
Consensus secondary structure and sequence conservation of RAGATH-8 RNA
Identifiers
SymbolRAGATH-8
Rfam RF02687
Other data
RNA type Gene; sRNA
GO GO:0003824
SO SO:0000370
PDB structures PDBe

RNAs Associated with Genes Associated with Twister and Hammerhead ribozymes (RAGATH) refers to a bioinformatics strategy that was devised to find self-cleaving ribozymes in bacteria. [1] It also refers to candidate RNAs, or RAGATH RNA motifs, discovered using this strategy.

With the discovery of the twister ribozyme, [2] it was recognized that many genetic elements in bacteria are often located nearby to twister ribozymes and also to the previously discovered hammerhead ribozymes. [2] These genetic elements include several gene classes, many of which are characteristic of Mu-like phages. The nearby elements also include twister and hammerhead ribozymes. In other words, twister and hammerhead ribozymes are often located in bacteria nearby to other twister or hammerhead ribozymes.

Given these observations, researchers hypothesized that other classes of self-cleaving ribozymes would also associate with these genetic elements. Therefore, searches were conducted on the non-coding regions nearby to the associated genetic elements to find conserved RNA structures using a previously established method. [3] Such RNA structures would then be candidates as self-cleaving ribozymes.

Using this method, previously unknown self-cleaving ribozyme classes were found: the twister sister, pistol and hatchet ribozymes. Unusual examples of hammerhead and HDV ribozymes were also found. Twelve additional conserved RNA structures did not appear to function as ribozymes, and the biological and biochemical functions of these RNAs remain unknown. All conserved RNAs were named "RAGATH RNA motifs", and the unsolved RNAs are numbered RAGATH-4 through RAGATH-15. Additional RAGATH motifs that did not self-cleave 'in vitro' were also later published. [4]

RAGATH-18 RNAs contain a predicted kink turn. [5] This particular example of a kink turn was studied to better understand how kink turn structures relate to their sequences.

Related Research Articles

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The YdaO/YuaA leader is a conserved RNA structure found upstream of the ydaO and yuaA genes in Bacillus subtilis and related genes in other bacteria. Its secondary structure and gene associations were predicted by bioinformatics.

ykkC-yxkD leader Conserved RNA structure in bacteria

The ykkC/yxkD leader is a conserved RNA structure found upstream of the ykkC and yxkD genes in Bacillus subtilis and related genes in other bacteria. The function of this family is unclear for many years although it has been suggested that it may function to switch on efflux pumps and detoxification systems in response to harmful environmental molecules. The Thermoanaerobacter tengcongensis sequence AE013027 overlaps with that of purine riboswitch suggesting that the two riboswitches may work in conjunction to regulate the upstream gene which codes for TTE0584 (Q8RC62), a member of the permease family.

c4 antisense RNA

The c4 antisense RNA is a non-coding RNA used by certain phages that infect bacteria. It was initially identified in the P1 and P7 phages of E. coli. The identification of c4 antisense RNAs solved the mystery of the mechanism for regulation of the ant gene, which is an anti-repressor.

<span class="mw-page-title-main">Methylobacterium-1 RNA motif</span>

The Methylobacterium-1 RNA motif is a conserved RNA structure discovered using bioinformatics. Almost all known examples of this RNA are found in DNA extracted from marine bacteria. However, one instance is predicted in Methylobacterium sp. 4-46, a species of alphaproteobacteria. The motif is presumed to function as a non-coding RNA.

<span class="mw-page-title-main">Twister ribozyme</span> Ribozyme capable of self-cleavage

The twister ribozyme is a catalytic RNA structure capable of self-cleavage. The nucleolytic activity of this ribozyme has been demonstrated both in vivo and in vitro and has one of the fastest catalytic rates of naturally occurring ribozymes with similar function. The twister ribozyme is considered to be a member of the small self-cleaving ribozyme family which includes the hammerhead, hairpin, hepatitis delta virus (HDV), Varkud satellite (VS), and glmS ribozymes.

<span class="mw-page-title-main">Twister sister ribozyme</span> RNA structure

The twister sister ribozyme (TS) is an RNA structure that catalyzes its own cleavage at a specific site. In other words, it is a self-cleaving ribozyme. The twister sister ribozyme was discovered by a bioinformatics strategy as an RNA Associated with Genes Associated with Twister and Hammerhead ribozymes, or RAGATH.

The pistol ribozyme is an RNA structure that catalyzes its own cleavage at a specific site. In other words, it is a self-cleaving ribozyme. The pistol ribozyme was discovered through comparative genomic analysis. Subsequent biochemical analysis determined further biochemical characteristics of the ribozyme. This understanding was further advanced by an atomic-resolution crystal structure of a pistol ribozyme

<span class="mw-page-title-main">Hatchet ribozyme</span> Self-cleaving ribozyme

Background: The hatchet ribozyme is an RNA structure that catalyzes its own cleavage at a specific site. In other words, it is a self-cleaving ribozyme. Hatchet ribozymes were discovered by a bioinformatics strategy as RNAs Associated with Genes Associated with Twister and Hammerhead ribozymes, or RAGATH.

Non-coding RNAs have been discovered using both experimental and bioinformatic approaches. Bioinformatic approaches can be divided into three main categories. The first involves homology search, although these techniques are by definition unable to find new classes of ncRNAs. The second category includes algorithms designed to discover specific types of ncRNAs that have similar properties. Finally, some discovery methods are based on very general properties of RNA, and are thus able to discover entirely new kinds of ncRNAs.

<i>Actinomyces</i>-1 RNA motif

The Actinomyces-1 RNA motif is a conserved RNA structure that was discovered by bioinformatics. Actinomyces-1 motifs are found in the genus Actinomyces, in the phylum Actinomycetota. Actinomyces-1 RNAs likely function in trans as sRNAs. In terms of their secondary structure, Actinomyces-1 RNAs consist of a multistem junction with many conserved GA dinucleotides.

<span class="mw-page-title-main">COG2827 RNA motif</span>

The COG2827 RNA motif is a conserved RNA structure that was discovered by bioinformatics. COG2827 motifs are found in Clostridiales.

<span class="mw-page-title-main">Drum RNA motif</span>

The drum RNA motif is a conserved RNA structure that was discovered by bioinformatics. Drum motifs are found in Bacillota, Bacteroidota, Pseudomonadota, and Spirochaetota, and exhibit multiple highly conserved nucleotide positions, despite their widespread distribution.

<span class="mw-page-title-main">DUF3268 RNA motif</span>

The DUF3268 RNA motif is a conserved RNA structure that was discovered by bioinformatics. DUF3268 motifs are found in Bacillota and Clostridia.

<span class="mw-page-title-main">EngA RNA motif</span>

The engA RNA motif is a conserved RNA structure that was discovered by bioinformatics. engA motifs are found in bacteria within the genus Prevotella.

<i>folE</i> RNA motif

The folE RNA motif, now known as the THF-II riboswitch, is a conserved RNA structure that was discovered by bioinformatics. folE motifs are found in Alphaproteobacteria.

<span class="mw-page-title-main">FuFi-1 RNA motif</span> Conserved RNA structure

The FuFi-1 RNA motif is a conserved RNA structure that was discovered by bioinformatics. Such RNA "motifs" are often the first step to elucidating the biological function of a novel RNA. FuFi-1 motif RNAs are found in Bacillota AND Fusobacteriota.

ivy-DE RNA motif

The ivy-DE RNA motif is a conserved RNA structure that was discovered by bioinformatics. ivy-DE motifs are found in the genus Pseudomonas.

<i>uup</i> RNA motif

The uup RNA motif is a conserved RNA structure that was discovered by bioinformatics. uup motif RNAs are found in Bacillota and Gammaproteobacteria.

Zeta-<i>pan</i> RNA motif

The Zeta-pan RNA motif is a conserved RNA structure that was discovered by bioinformatics. Zeta-pan motif RNAs are found in Zetaproteobacteria.

An RNA motif is a description of a group of RNAs that have a related structure. RNA motifs consist of a pattern of features within the primary sequence and secondary structure of related RNAs. Thus, it extends the concept of a sequence motif to include RNA secondary structure. The term "RNA motif" can refer both to the pattern and to the RNA sequences that match it.

References

  1. Weinberg Z, Kim PB, Chen TH, Li S, Harris KA, Lünse CE, Breaker RR (2015). "New classes of self-cleaving ribozymes revealed by comparative genomics analysis". Nat. Chem. Biol. 11 (8): 606–10. doi:10.1038/nchembio.1846. PMC   4509812 . PMID   26167874.
  2. 1 2 Roth A, Weinberg Z, Chen AG, Kim PB, Ames TD, Breaker RR (2014). "A widespread self-cleaving ribozyme class is revealed by bioinformatics". Nat. Chem. Biol. 10 (1): 56–60. doi:10.1038/nchembio.1386. PMC   3867598 . PMID   24240507.
  3. Weinberg Z, Wang JX, Bogue J, Yang J, Corbino K, Moy RH, Breaker RR (2010). "Comparative genomics reveals 104 candidate structured RNAs from bacteria, archaea, and their metagenomes". Genome Biol. 11 (3): R31. doi: 10.1186/gb-2010-11-3-r31 . PMC   2864571 . PMID   20230605.
  4. Weinberg Z, Lünse CE, Corbino KA, Ames TD, Nelson JW, Roth A, Perkins KR, Sherlock ME, Breaker RR (October 2017). "Detection of 224 candidate structured RNAs by comparative analysis of specific subsets of intergenic regions". Nucleic Acids Res. 45 (18): 10811–10823. doi:10.1093/nar/gkx699. PMC   5737381 . PMID   28977401.
  5. Huang L, Liao X, Li M, Wang J, Peng X, Wilson TJ, Lilley DM (June 2021). "Structure and folding of four putative kink turns identified in structured RNA species in a test of structural prediction rules". Nucleic Acids Res. 49 (10): 5916–5924. doi:10.1093/nar/gkab333. PMC   8191799 . PMID   33978763.