Design and signaling mechanism of light-regulated histidine kinases

Titelangaben

Möglich, Andreas ; Ayers, Rebecca A. ; Moffat, Keith:
Design and signaling mechanism of light-regulated histidine kinases.
In: Journal of Molecular Biology. Bd. 385 (2009) Heft 5 . - S. 1433-1444.
ISSN 0022-2836
DOI: https://doi.org/10.1016/j.jmb.2008.12.017

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Abstract

Signal transduction proteins are organized into sensor (input) domains that perceive a signal and, in response, regulate the biological activity of effector (output) domains. We reprogrammed the input signal specificity of a normally oxygen-sensitive, light-inert histidine kinase by replacing its chemosensor domain by a light-oxygen-voltage photosensor domain. Illumination of the resultant fusion kinase YF1 reduced net kinase activity by approximately 1000-fold in vitro. YF1 also controls gene expression in a light-dependent manner in vivo. Signals are transmitted from the light-oxygen-voltage sensor domain to the histidine kinase domain via a 40 degrees -60 degrees rotational movement within an alpha-helical coiled-coil linker; light is acting as a rotary switch. These signaling principles are broadly applicable to domains linked by alpha-helices and to chemo- and photosensors. Conserved sequence motifs guide the rational design of light-regulated variants of histidine kinases and other proteins.