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Wheat F-box protein recruits proteins and regulates their abundance during wheat spike development

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Abstract

F-box proteins, components of the Skp1–Cullin1–F-box (SCF) protein E3 ubiquitin ligase complex, serve as the variable component responsible for substrate recognition and recruitment in SCF-mediated proteolysis. F-box proteins interact with Skp1 through the F-box motif and with ubiquitination substrates through C-terminal protein interaction domains. F-box proteins regulate plant development, various hormonal signal transduction processes, circadian rhythm, and cell cycle control. We isolated an F-box protein gene from wheat spikes at the onset of flowering. The Triticum aestivum cyclin F-box domain (TaCFBD) gene showed elevated expression levels during early inflorescence development and under cold stress treatment. TaCFBD green fluorescent protein signals were localized in the cytoplasm and plasma membrane. We used yeast two-hybrid screening to identify proteins that potentially interact with TaCFBD. Fructose bisphosphate aldolase, aspartic protease, VHS, glycine-rich RNA-binding protein, and the 26S proteasome non-ATPase regulatory subunit were positive candidate proteins. The bimolecular fluorescence complementation assay revealed the interaction of TaCFBD with partner proteins in the plasma membranes of tobacco cells. Our results suggest that the TaCFBD protein acts as an adaptor between target substrates and the SCF complex and provides substrate specificity to the SCF of ubiquitin ligase complexes.

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Abbreviations

ABA:

Abscisic acid

AP:

Aspartic proteinase

BiFC:

Bimolecular fluorescence complementation

DAF:

Days after flowering

FBP:

Fructose-bisphosphate aldolase

GA3 :

Gibberellic acid

GFP:

Green fluorescent protein

MeJA:

Methyl jasmonate

MES:

2-(Morpholino)ethanesulfonic acid

OD:

Optical density

PEG:

Polyethylene glycol

SCF:

SKP1–Cullin–F-box

TaCFBD:

Triticum aestivum cyclin F-box domain protein

whGRP:

Glycine-rich RNA-binding protein

26S:

26S proteasome non-ATPase regulatory subunit

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Acknowledgments

This research was supported by the Technology Development Program for Agriculture and Forestry, Ministry for Food, Agriculture, Forestry and Fisheries, Republic of Korea. This work was also supported by a grant from the Next-Generation BioGreen 21 Program (Plant Molecular Breeding Center No. PJ0080312012), Rural Development Administration, Republic of Korea.

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Authors and Affiliations

  1. Division of Biotechnology, Korea University, Anam-Dong, Seongbuk-Gu, Seoul, 136-701, Republic of Korea

    Min Jeong Hong, Dae Yeon Kim & Yong Weon Seo

  2. Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, 1266 Sinjeong, Jeongeup, 580-185, Republic of Korea

    Si Yong Kang, Dong Sub Kim & Jin Baek Kim

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  1. Min Jeong Hong
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Correspondence to Yong Weon Seo.

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Hong, M.J., Kim, D.Y., Kang, S.Y. et al. Wheat F-box protein recruits proteins and regulates their abundance during wheat spike development. Mol Biol Rep 39, 9681–9696 (2012). https://doi.org/10.1007/s11033-012-1833-3

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