InterPro domain: IPR003676

This entry represents a group of plant auxin-responsive proteins, known as small auxin-up RNA (SAUR) [ 1 ]. The first SAUR gene was originally identified in soybean hypocotyls [ 2 ]. SAUR genes are mainly expressed in growing hypocotyls or other elongating tissues, implying that they play a role in the regulation of cell elongation [ 3 ]. SAUR proteins may provide a mechanistic link between auxin and plasma membrane H+-ATPases (PM H+-ATPases) in Arabidopsis thaliana [ 3 ].

1. Regulatory activity exerted by the SAUR-AC1 promoter region in transgenic plants. Plant Mol. Biol. 34, 803-8
2. Characterization of a class of small auxin-inducible soybean polyadenylated RNAs. Plant Mol. Biol. 9, 611-23
3. SAUR Inhibition of PP2C-D Phosphatases Activates Plasma Membrane H+-ATPases to Promote Cell Expansion in Arabidopsis. Plant Cell 26, 2129-2142