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Updated: Nov 4, 2025

A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
Published on: June 8, 2022
The Journey from Two-Step to Multi-Step Phosphorelay Signaling Systems
Deepti Singh1, Priyanka Gupta1, Sneh Lata Singla-Pareek1
11Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India; 2Plant Stress Biology, International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India; 3The UWA Institute of Agriculture, The University of Western Australia, Perth WA 6001, Australia; 4National Agri-Food Biotechnology Institute, Punjab, Ajitgarh 140306, India.
Two-component signaling (TCS) systems evolved from simple prokaryotic two-step phosphorelays (TSP) to complex eukaryotic multi-step phosphorelays (MSP). This evolutionary journey, marked by structural changes in TCS components, informs crop improvement strategies.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Biochemistry
Background:
- Two-component signaling (TCS) systems are crucial signal transduction mechanisms in prokaryotes and eukaryotes (excluding animals).
- These systems utilize a protein phosphorylation mechanism for transmitting signals within cells.
Purpose of the Study:
- To review the evolutionary trajectory of TCS systems from primitive forms to complex ones.
- To highlight the structural modifications in TCS components during evolution.
- To provide insights for future crop improvement strategies based on TCS machinery.
Main Methods:
- Comparative analysis of TCS system components across different genera.
- Review of existing literature on TCS evolution and structural modifications.
- Examination of the transition from two-step phosphorelay (TSP) to multi-step phosphorelay (MSP) systems.
Main Results:
- Prokaryotic TCS systems feature a basic structure of histidine kinase (HK) and response regulator (RR), known as TSP.
- Eukaryotic TCS systems incorporate a histidine-containing phosphotransfer (HPT) protein, enabling a more complex MSP cascade.
- Significant structural alterations in TCS components accompany the evolutionary progression from TSP to MSP.
Conclusions:
- The evolution of TCS machinery reflects a transition from simple to complex signaling pathways.
- Understanding TCS evolution and structural changes is vital for advancing crop science.
- This review offers a framework for leveraging TCS components in developing improved crop varieties.
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