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Ibrahim Njimona1, Rui Yang1, Tilman Lamparter1

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Summary
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Bacteriophytochromes (BphPs) are bacterial light-sensing proteins. Their His kinase activity shows distinct temperature-dependent patterns, suggesting a role in sensing or transducing temperature signals.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Bacteriophytochromes (BphPs) are bacterial photoreceptors utilizing bilin chromophores.
  • Many BphPs possess light-regulated His kinase domains crucial for signal transduction.
  • Temperature effects on BphP activity and function are not fully understood.

Purpose of the Study:

  • To investigate the temperature dependence of His kinase activity in two BphPs: Agp1 and Cph1.
  • To compare the temperature sensitivity of the apoprotein versus holoprotein forms.
  • To explore potential roles of BphPs in temperature sensing or signal transduction.

Main Methods:

  • Enzyme kinetics assays measuring His kinase activity across a temperature range (5°C–40°C).
  • Comparative analysis of phosphorylation activity for apoprotein and holoprotein forms under different light conditions (red and far-red irradiation).
  • Observation of spectral properties and stability under prolonged irradiation at elevated temperatures.

Main Results:

  • Both Agp1 and Cph1 exhibited temperature-dependent His kinase activity with distinct optima.
  • Phosphorylation activity increased with temperature up to a point (25°C for Agp1, 20°C for Cph1 apoprotein) then decreased.
  • Irreversible bleaching of Cph1 at 40°C under red light was dependent on the His kinase module, suggesting temperature-mediated regulation.

Conclusions:

  • Bacteriophytochrome His kinases display significant temperature-dependent characteristics, potentially shared across the protein class.
  • These temperature sensitivities suggest a role for BphPs in mediating cellular responses to thermal changes.
  • Phytochrome B mutants in Arabidopsis showing reduced growth at high temperatures further support this hypothesis.