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SMALL ACIDIC PROTEIN 1 acts with RUB modification components, the COP9 signalosome and AXR1, to regulate growth and development of ${it Arabidopsis thaliana}$

SMALL ACIDIC PROTEIN 1はCOP9シグナロゾームやAXR1などのRUB修飾因子とともにシロイヌナズナの生長や発生に機能している

大野 豊; 中曽根 光*; 藤原 正幸*; 深尾 陽一朗*; Biswas, K.; Rahman, A.*; 川合 真紀*; 内宮 博文*; 鳴海 一成

Ono, Yutaka; Nakasone, Akari*; Fujiwara, Masayuki*; Fukao, Yoichiro*; Biswas, K.; Rahman, A.*; Kawai, Maki*; Uchimiya, Hirofumi*; Narumi, Issei

Here, we demonstrated that SMALL ACIDIC PROTEIN 1 (SMAP1) is required for normal plant growth and development, and roots response to IAA or methyl jasmonate in the ${it auxin resistant 1}$ (${it axr1}$) mutation background. Deletion analysis and pull-down assays showed that SMAP1 physically interacts with the CONSTITUTIVE PHOTOMORPHOGENIC-9 SIGNALOSOME (CSN) via the SMAP1 F/D-region. The extremely dwarf phenotype of aar1-1 csn5a-1 double mutant confirms the functional role of SMAP1 in plant growth and development under limiting CSN functionality. Our findings suggest that ${it SMAP1}$ is involved in the auxin response and possibly in other cullin-RING ubiquitin ligase -regulated signaling processes via its interaction with components associated with related-to-ubiquitin (RUB) modification.

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