Shining Light on the Function of NPH3/RPT2-Like Proteins in Phototropin Signaling

John M. Christie; Noriyuki Suetsugu; Stuart Sullivan; Masamitsu Wada

doi:10.1104/pp.17.00835

July 18, 2017ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam)Open Access

Shining Light on the Function of NPH3/RPT2-Like Proteins in Phototropin Signaling

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Key Points

To review the biochemical functions, evolutionary conservation, and regulatory mechanisms of the NPH3/RPT2-like (NRL) protein family in phototropin-mediated signaling across plants.
Synthesized molecular, genetic, and biochemical evidence evaluating phototropin autophosphorylation and plasma membrane interactions in Arabidopsis thaliana.
Evaluated phylogenetic classifications across land plants and algae to trace the evolutionary diversification of the seven NRL clades.
Assessed dynamic light-dependent protein phosphorylation, dephosphorylation, and subcellular relocation kinetics of NPH3 and RPT2.
NPH3 directly binds phot1 and undergoes blue light-induced rapid dephosphorylation and internalization into cytosolic microdomains to regulate hypocotyl phototropism through auxin redistribution.
RPT2 acts in concert with phot1 to reconstitute the active signaling complex under continuous blue light, while also functioning redundantly with NCH1 to drive chloroplast accumulation movement.
Demonstrated that chloroplast photorelocation operates in an auxin-independent manner, disproving the paradigm that NRL family proteins function exclusively through auxin transport pathways.

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Implication

Review reveals how NPH3/RPT2-like family proteins coordinate phototropin kinase signaling in plants, highlighting both auxin-dependent and auxin-independent physiological responses.

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Christie et al. (2017) studied this question.

synapsesocial.com/papers/6a715973e5469ee92be1e80b https://doi.org/10.1104/pp.17.00835

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Shining Light on the Function of NPH3/RPT2-Like Proteins in Phototropin Signaling

Key Points

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Discussion

Cite This Study

Shining Light on the Function of NPH3/RPT2-Like Proteins in Phototropin Signaling

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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