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

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

We demonstrated that SMALL ACIDIC PROTEIN 1 ${it SMAP1}$ 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 green fluorescent protein (GFP) / glutathione S-transferase (GST) 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 ${it aar1-1 csn5a-1}$ double mutant confirms the functional role of ${it SMAP1}$ in plant growth and development under limiting CSN functionality. Our findings suggest that SMAP1 is involved in the auxin response and possibly in other cullin-RING ubiquitin ligase (CRL)-regulated signaling processes via its interaction with components associated with related-to-ubiquitin (RUB) modification.

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Category:Plant Sciences

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