S-box Element

The S-box element is a riboswitch that controls different genes of sulphur metabolism in response to the presence of S-adenosylmethionine.

• Upon binding of SAM, the riboswitch adopts a terminator structure resulting in transcription termination.
• In the aabsence of SAM, the riboswitch has the antitermination structure that allows transcription elongation into the controlled gene/ operon.

Genes controlled by a S-box

• cysH-cysP-sat-cysC-ylnD-ylnE-ylnF
• metE
• metI-metC
• metK
• metN-metP-metQ
• mtnK-mtnS
• mtnW-mtnX-mtnB-mtnD
• yitJ-yitI-yitH
• yoaD-yoaC-yoaB
• yxjG
• yxjH

References

Jerneja Tomsic, Brooke A McDaniel, Frank J Grundy, Tina M Henkin
Natural variability in S-adenosylmethionine (SAM)-dependent riboswitches: S-box elements in bacillus subtilis exhibit differential sensitivity to SAM In vivo and in vitro.
J Bacteriol: 2008, 190(3);823-33
[PubMed:18039762] [WorldCat.org] [DOI] (I p)

T M Henkin, F J Grundy
Sensing metabolic signals with nascent RNA transcripts: the T box and S box riboswitches as paradigms.
Cold Spring Harb Symp Quant Biol: 2006, 71;231-7
[PubMed:17381302] [WorldCat.org] [DOI] (P p)