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Title: Cooperative control between AtRGS1 and AtHXK1 in a WD40-repeat protein pathway in Arabidopsis thaliana

Journal Article · · Frontiers in Plant Science
 [1];  [2];  [3];  [2]
  1. Northeast Agricultural Univ., Harbin (China); Univ. of North Carolina, Chapel Hill, NC (United States)
  2. Univ. of North Carolina, Chapel Hill, NC (United States)
  3. Northeast Agricultural Univ., Harbin (China)

HEXOKINASE 1 (AtHXK1) and Regulator of G-protein Signaling 1 (AtRGS1) pathways, mediate D-glucose signaling in Arabidopsis. However, it is not known the degree, if any, that these pathways overlap and how. We show modest signaling crosstalk between these pathways, albeit complex with both epistatic interactions and additive effects that may be indirect. The action of HXK1 on AtRGS1 signaling lies downstream of the primary step in G protein-mediated sugar signaling in which the WD-repeat protein, AGB1, is the propelling signaling element. RHIP1, a previously unknown protein predicted here to have a 3-stranded helical structure, interacts with both AtRGS1 and AtHXK1 in planta and is required for some glucose-regulated gene expression, providing a physical connection between these two proteins in sugar signaling. The rhip1 null mutant displays similar seedling growth phenotypes as rgs1-2 in response to glucose, further suggesting a role for RHIP1 in glucose signaling. Lastly, glucose signaling is a complex hierarchical relationship which is specific to the target gene and sugar phenotype and suggests that there are two glycolysis-independent glucose signaling sensors: AtRGS1 and AtHXK1 that weakly communicate with each other via feed-back and feed-forward loops to fine tune the response to glucose.

Research Organization:
University of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER15671
OSTI ID:
1239293
Journal Information:
Frontiers in Plant Science, Vol. 6; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (13)

Mulberry RGS negatively regulates salt stress response and tolerance text January 2019
Photosynthate Regulation of the Root System Architecture Mediated by the Heterotrimeric G Protein Complex in Arabidopsis text January 2016
Autophagy in Plants: Both a Puppet and a Puppet Master of Sugars journal January 2019
Correlation of Autophagosome Formation with Degradation and Endocytosis Arabidopsis Regulator of G-Protein Signaling (RGS1) through ATG8a journal August 2019
Mulberry RGS negatively regulates salt stress response and tolerance text January 2019
HEXOKINASE 1 Control of Post-Germinative Seedling Growth preprint February 2023
Photosynthate Regulation of the Root System Architecture Mediated by the Heterotrimeric G Protein Complex in Arabidopsis journal August 2016
BRL3 and AtRGS1 cooperate to fine tune growth inhibition and ROS activation text January 2017
Quantitative Early Auxin Root Proteomics Identifies GAUT10, a Galacturonosyltransferase, as a Novel Regulator of Root Meristem Maintenance journal March 2019
Endocytosis of AtRGS1 Is Regulated by the Autophagy Pathway after D-Glucose Stimulation journal July 2017
The Nucleotide‐Dependent Interactome of Rice Heterotrimeric G‐Protein α ‐Subunit journal April 2019
Long-distance communication in Arabidopsis involving a self-activating G protein journal February 2018
Mulberry RGS negatively regulates salt stress response and tolerance journal September 2019