UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

A two-component regulatory system in transcriptional control of photosystem stoichiometry: redox-dependent and sodium ion-dependent phosphoryl transfer from cyanobacterial histidine kinase Hik2 to response regulators Rre1 and RppA

Allen, JF; Ibrahim, IM; Puthiyaveetil, S; (2016) A two-component regulatory system in transcriptional control of photosystem stoichiometry: redox-dependent and sodium ion-dependent phosphoryl transfer from cyanobacterial histidine kinase Hik2 to response regulators Rre1 and RppA. Frontiers in Plant Science , 7 (137) 10.3389/fpls.2016.00137. Green open access

[img]
Preview
Text
Allen_Frontiers_in_Plant_Science.pdf

Download (3MB) | Preview

Abstract

We report on regulation and interactions of a unique histidine sensor kinase, Hik2. Hik2 is found in all known cyanobacteria, but has no previously identified functional response regulator. Here we show that it transfers phosphate rapidly, in vitro, to two response regulators, termed Rre1 and RppA. Hik2 is of special importance in being indispensable to cyanobacteria, and in being the closest cyanobacterial homologue of the uniquely conserved Chloroplast Sensor Kinase (CSK), which couples photosynthetic electron transport to gene transcription. Hik2 function is so important that it has survived the transition from cyanobacterium to eukaryotic sub-cellular organelle. Hik2 is likely to be a redox sensor involved in adjustment of the stoichiometry of photosystems I and II of oxygenic photosynthesis. We show that Hik2 also responds to the specific presence of sodium ions. These regulatory controls and the bifurcated signal transduction pathway indicated by two response regulators lead to a proposal for integration of photosynthetic light-acclimation with response to salt stress.

Type: Article
Title: A two-component regulatory system in transcriptional control of photosystem stoichiometry: redox-dependent and sodium ion-dependent phosphoryl transfer from cyanobacterial histidine kinase Hik2 to response regulators Rre1 and RppA
Open access status: An open access version is available from UCL Discovery
DOI: 10.3389/fpls.2016.00137
Publisher version: http://dx.doi.org/10.3389/fpls.2016.00137
Language: English
Additional information: © 2016 Ibrahim, Puthiyaveetil and Allen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (http://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Keywords: redox sensor, redox response regulator, Photosystem stoichiometry, transcriptional control, photosystem II, photosystem I, Chloroplast Sensor Kinase (CSK), Synechocystis sp. PCC 6803, Histidine Kinase 2
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: http://discovery.ucl.ac.uk/id/eprint/1474237
Downloads since deposit
74Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item