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TitleThe switch that does not flip: the blue-light receptor YtvA from Bacillus subtilis adopts an elongated dimer conformation independent of the activation state as revealed by a combined AUC and SAXS study.
Journal, issue, pagesJ Mol Biol, Vol. 403, Issue 1, Page 78-87, Year 2010
Publish dateOct 15, 2010
AuthorsMarcel Jurk / Matthias Dorn / Alexey Kikhney / Dmitri Svergun / Wolfgang Gärtner / Peter Schmieder /
PubMed AbstractPhotoreceptors play an important role in plants and bacteria by converting extracellular stimuli into intracellular signals. One distinct class are the blue-light-sensitive phototropins harboring a ...Photoreceptors play an important role in plants and bacteria by converting extracellular stimuli into intracellular signals. One distinct class are the blue-light-sensitive phototropins harboring a light-oxygen-voltage (LOV) domain coupled to various effector domains. Photon absorption by the chromophore within the LOV domain results in an activation of the output domain via mechanisms that are hitherto not well understood. The photoreceptor YtvA from Bacillus subtilis is a bacterial analog of phototropins, consists of an LOV and a sulfate transporter/anti-sigma factor antagonist domain, and is involved in the response of the bacterium to environmental stress. We present here analytical ultracentrifugation studies and small-angle X-ray scattering experiments, showing that YtvA is a dimer. On the basis of these results, we present a low-resolution model of the dimer in the dark and the lit state of the protein. In addition, we show that YtvA does not change its oligomerization state or its overall shape upon light activation.
External linksJ Mol Biol / PubMed:20800068
MethodsSAS (X-ray synchrotron)
Structure data

SASDC56:
YtvA (dark/inactive state) (YtvA (pfyP - Blue light photoreceptor - Bacillus subtilis (strain 168), YtvA)
Method: SAXS/SANS

SASDC66:
YtvA (lit/active state) (YtvA (pfyP - Blue light photoreceptor - Bacillus subtilis (strain 168), YtvA)
Method: SAXS/SANS

Source
  • Escherichia coli (E. coli)

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