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Signal transduction in photoreceptor histidine kinases

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005005
URN to cite this document: urn:nbn:de:bvb:703-epub-5005-6

Title data

Möglich, Andreas:
Signal transduction in photoreceptor histidine kinases.
In: Protein Science. (9 August 2019) .
ISSN 1469-896X
DOI der Verlagsversion: https://doi.org/10.1002/pro.3705

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Project information

Project financing: Alexander von Humboldt-Stiftung
Deutsche Forschungsgemeinschaft

Abstract

Abstract Two-component systems (TCS) constitute the predominant means by which prokaryotes read out and adapt to their environment. Canonical TCSs comprise a sensor histidine kinase (SHK), usually a transmembrane receptor, and a response regulator (RR). In signal-dependent manner, the SHK autophosphorylates and in turn transfers the phosphoryl group to the RR which then elicits downstream responses, often in form of altered gene expression. SHKs also catalyze the hydrolysis of the phospho-RR, hence, tightly adjusting the overall degree of RR phosphorylation. Photoreceptor histidine kinases are a subset of mostly soluble, cytosolic SHKs that sense light in the near-ultraviolet to near-infrared spectral range. Owing to their experimental tractability, photoreceptor histidine kinases serve as paradigms and provide unusually detailed molecular insight into signal detection, decoding, and regulation of SHK activity. The synthesis of recent results on receptors with light-oxygen-voltage, bacteriophytochrome and microbial rhodopsin sensor units identifies recurring, joint signaling strategies. Light signals are initially absorbed by the sensor module and converted into subtle rearrangements of α helices, mostly through pivoting and rotation. These conformational transitions propagate through parallel coiled-coil linkers to the effector unit as changes in left-handed superhelical winding. Within the effector, subtle conformations are triggered that modulate the solvent accessibility of residues engaged in the kinase and phosphatase activities. Taken together, a consistent view of the entire trajectory from signal detection to regulation of output emerges. The underlying allosteric mechanisms could widely apply to TCS signaling in general.

Further data

Item Type: Article in a journal
Keywords: allostery, bacterial phytochrome; coiled coil; light-oxygen-voltage; sensor histidine kinase; sensory photoreceptor; sensory rhodopsin; signal transduction; two-component system
DDC Subjects: 500 Science > 570 Life sciences, biology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Biochemistry > Chair Biochemistry - Univ.-Prof. Dr. Andreas Möglich
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Biochemistry
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5005-6
Date Deposited: 14 Aug 2020 06:55
Last Modified: 14 Aug 2020 06:55
URI: https://epub.uni-bayreuth.de/id/eprint/5005

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