Riboswitch: Difference between revisions
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Normally, a variety of proteins and protein cofactors control gene expression in an organism by binding to different sites on messenger RNA (mRNA). '''Riboswitches''' are genetic regulatory elements that are built directly into the [[RNA]]. They are a type of noncoding RNA that regulate gene expression in the absence of proteins by switching from one structural conformation (shape) to another in response to ligand binding. Most contain a single binding site that recognizes a specific ligand. The ability of a riboswitch to discriminate against molecules that are similar or closely related to its ligand is essential to prevent metabolic misregulation<ref name=scimag>Breaker, Ronald R. (28 March, 2008). Complex Riboswitches. ''Science'', 319(5871), 1795-1797. doi:[http://dx.doi.org/10.1126/science.1152621 10.1126/science.1152621]</ref>. | Normally, a variety of proteins and protein cofactors control gene expression in an organism by binding to different sites on messenger RNA (mRNA). '''Riboswitches''' are genetic regulatory elements that are built directly into the [[RNA]]. They are a type of noncoding RNA that regulate gene expression in the absence of proteins by switching from one structural conformation (shape) to another in response to ligand binding. Most contain a single binding site that recognizes a specific ligand. The ability of a riboswitch to discriminate against molecules that are similar or closely related to its ligand is essential to prevent metabolic misregulation<ref name=scimag>Breaker, Ronald R. (28 March, 2008). Complex Riboswitches. ''Science'', 319(5871), 1795-1797. doi:[http://dx.doi.org/10.1126/science.1152621 10.1126/science.1152621]</ref>. | ||
The various classes of riboswitches discovered so far are differentiated by their respective ligands. Every class of riboswitch is characterized by an aptamer (binding site) domain, which provides the site for ligand binding, and an expression platform that undergoes conformational change. The sequences and structures of aptamer domains are highly conserved, and therefore exhibit little variation among riboswitches belonging to the same class. | The various classes of riboswitches discovered so far are differentiated by their respective '''ligands'''. Every class of riboswitch is characterized by an aptamer (binding site) domain, which provides the site for ligand binding, and an expression platform that undergoes conformational change. The sequences and structures of aptamer domains are highly conserved, and therefore exhibit little variation among riboswitches belonging to the same class. | ||
*M-box riboswitch couples Mg level to expression of metal transport genes<ref>PMLD:21315082</ref>. | |||
For details on guanine riboswitch see<br /> | For details on guanine riboswitch see<br /> | ||
* [[Guanine-Binding Riboswitch]]<br /> | * [[Guanine-Binding Riboswitch]]<br /> | ||