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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

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Light Controls Protein Localization through Phytochrome-Mediated Alternative Promoter Selection.

Tomokazu Ushijima¹, Kousuke Hanada², Eiji Gotoh¹

¹Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan.

|November 14, 2017

Summary

Plant photoreceptor phytochrome uses alternative promoter selection to change protein localization. This mechanism helps plants adapt to light conditions, for example, by creating a photorespiratory bypass.

Keywords:

alternative promoter gene expression light signaling photoinhibition photorespiration phytochrome protein localization

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Area of Science:

Molecular Biology
Plant Biology
Genetics

Background:

Alternative promoter usage expands the proteome by producing multiple pre-mRNAs from a single gene.
The role of alternative promoters in normal physiological responses is not fully understood.

Purpose of the Study:

To investigate how the plant photoreceptor phytochrome influences alternative promoter selection.
To understand the impact of alternative promoter usage on protein localization and function in response to light.

Main Methods:

Genome-wide analysis of alternative promoter selection in Arabidopsis thaliana.
Characterization of protein isoforms and their subcellular localization under different light conditions.

Main Results:

Phytochrome induces genome-wide changes in alternative promoter selection.
Protein isoforms with distinct N termini exhibit light-dependent localization.
A cytoplasmic isoform of glycerate kinase (GLYK) was identified in shade-grown plants, functioning as a photorespiratory bypass.

Conclusions:

Phytochrome regulates protein localization via alternative promoter selection to adapt to light fluctuations.
Alternative promoter usage is a key regulatory layer in eukaryotes for proteome diversification and organismal adaptation.