Research Progress on Auxin Responsive Non-canonical Aux/IAA Proteins in Plants

doi:10.11983/CBB23106

Abstract

Abstract: The plant hormone auxin regulates many processes of plant growth and development, including embryonic development, organogenesis, and tropism, as well as environmental adaptation. To perform these functions, auxin mainly depends on the typical TIR1/AFB-auxin-Aux/IAA-ARF signaling pathway. In this pathway, the canonical Aux/IAA proteins composed of four conserved domains play a key role in auxin signaling as co-receptor with TIR1/AFB. Recently, some non-canonical Aux/IAA proteins lacking conserved domain(s) were also found to be involved in the auxin response. This review focuses on the research advances of non-canonical Aux/IAA proteins on their structure, biological function and roles in auxin signal transduction, and discusses the future research directions of these proteins.

Key words: auxin, Aux/IAA protein, non-canonical Aux/IAA protein, structure and function, signal transduction

Yuying Zhou, Hui Chen, Simu Liu. Research Progress on Auxin Responsive Non-canonical Aux/IAA Proteins in Plants[J]. Chinese Bulletin of Botany, 2024, 59(4): 651-658.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB23106

https://www.chinbullbotany.com/EN/Y2024/V59/I4/651

Figures/Tables 3

Figure 1 Functional domain diagram of canonical Aux/IAA protein (Tiwari et al., 2004; Szemenyei et al., 2008; Calderón Villalobos et al., 2012; Guilfoyle, 2015)

Table 1 Non-canonical Aux/IAA proteins lack the LxLxL motif of domain I and/or the VGWPPV core amino acid resi- dues of domain II

非典型Aux/ IAA蛋白	结构域I	结构域II
拟南芥 (Arabidopsis thaliana)
AtIAA20	SSSSSSIES	···SVAAPAVEDAEYV
AtIAA30	SSSSSSIES	···EYDG··VGAAEEM
AtIAA31	·········	REARQDWPPIKSRLRD
AtIAA32	NTPADFFKG	ELIDWSQPSYNSITQL
AtIAA33	·········	SSGAAG·RSFQGFGLN
AtIAA34	PHPLHLVAS	GVIDLG·LSLRTIQHE
水稻 (Oryza sativa)
OsIAA4	·········	················
OsIAA8	TDLRLGLTL	VVHIDGNNPSTPRSSL
OsIAA26	TELTLGPPG	RGRKNGHPPPSSSM··
OsIAA27	·········	DETTAPPPRSAAAATE
OsIAA28	·········	DRNASAGPEVKPAGLS
OsIAA29	·········	DRNASAEPVVKP·GLS

Figure 2 Aux/IAA-mediated auxin signaling pathway (Chen et al., 2018; Mutte et al., 2018; Cao et al., 2019; Lv et al., 2020; Yu et al., 2022) (A) Canonical Aux/IAA-mediated auxin signaling pathway; (B) TMK1-AtIAA32/34-mediated auxin signaling pathway in Arabidopsis; (C) MPK14-AtIAA33-mediated auxin signaling pathway in Arabidopsis; (D) SOR1-OsIAA26-mediated auxin signaling in rice.

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