SMALL ACIDIC PROTEIN 1 acts with RUB modification components, the COP9 signalosome and AXR1, to regulate growth and development of

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

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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 () 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 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.