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- SAM-SAH_riboswitch abstract "The SAM-SAH riboswitch is a conserved RNA structure in certain bacteria that binds S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) and is therefore presumed to be a riboswitch. SAM-SAH riboswitches do not share any apparent structural resemblance to known riboswitches that bind SAM or SAH. The binding affinities for both compounds are similar, but binding for SAH is at least somewhat stronger. SAM-SAH riboswitches are exclusively found in Rhodobacterales, an order of alphaproteobacteria. They are always found in the apparent 5' untranslated regions of metK genes, which encode the enzyme (Methionine adenosyltransferase) that synthesizes SAM. Given this gene association, it was proposed that SAM-SAH riboswitches more likely function as SAM-sensing RNAs. SAM-SAH riboswitches are relatively small among known riboswitches, which might relate to their inability to discriminate against SAH. However, the ability to reject SAH as a ligand might not be important under physiological conditions, because the cellular concentration of SAM is higher.A region of the conserved structure of SAM-SAH riboswitches includes a predicted Shine-Dalgarno sequence (ribosome-binding site) of the downstream metK genes. These nucleotides are required for optimal binding to the ligand and might form a pseudoknot with the terminal loop within the main stem-loop structure. Occlusion of the Shine-Dalgarno sequence might be the mechanism by which SAM-SAH riboswitches regulate expression of the downstream genes.".
- SAM-SAH_riboswitch thumbnail SAM-SAH-riboswitch.svg?width=300.
- SAM-SAH_riboswitch wikiPageID "26607279".
- SAM-SAH_riboswitch wikiPageRevisionID "592991181".
- SAM-SAH_riboswitch caption "Consensus secondary structure of SAM-SAH riboswitches".
- SAM-SAH_riboswitch hasPhotoCollection SAM-SAH_riboswitch.
- SAM-SAH_riboswitch id "RF01727".
- SAM-SAH_riboswitch name "SAM/SAH riboswitch".
- SAM-SAH_riboswitch rfam "RF01727".
- SAM-SAH_riboswitch rnaType Riboswitch.
- SAM-SAH_riboswitch symbol "SAM/SAH riboswitch".
- SAM-SAH_riboswitch taxDomain Rhodobacterales.
- SAM-SAH_riboswitch subject Category:Cis-regulatory_RNA_elements.
- SAM-SAH_riboswitch subject Category:Riboswitch.
- SAM-SAH_riboswitch type Abstraction100002137.
- SAM-SAH_riboswitch type Cis-regulatoryRNAElements.
- SAM-SAH_riboswitch type Cognition100023271.
- SAM-SAH_riboswitch type Component105868954.
- SAM-SAH_riboswitch type Concept105835747.
- SAM-SAH_riboswitch type Content105809192.
- SAM-SAH_riboswitch type Idea105833840.
- SAM-SAH_riboswitch type Part105867413.
- SAM-SAH_riboswitch type PsychologicalFeature100023100.
- SAM-SAH_riboswitch comment "The SAM-SAH riboswitch is a conserved RNA structure in certain bacteria that binds S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH) and is therefore presumed to be a riboswitch. SAM-SAH riboswitches do not share any apparent structural resemblance to known riboswitches that bind SAM or SAH. The binding affinities for both compounds are similar, but binding for SAH is at least somewhat stronger.".
- SAM-SAH_riboswitch label "SAM-SAH riboswitch".
- SAM-SAH_riboswitch sameAs m.0bh8snn.
- SAM-SAH_riboswitch sameAs Q7388619.
- SAM-SAH_riboswitch sameAs Q7388619.
- SAM-SAH_riboswitch sameAs SAM-SAH_riboswitch.
- SAM-SAH_riboswitch wasDerivedFrom SAM-SAH_riboswitch?oldid=592991181.
- SAM-SAH_riboswitch depiction SAM-SAH-riboswitch.svg.
- SAM-SAH_riboswitch isPrimaryTopicOf SAM-SAH_riboswitch.
