Function
E3 ubiquitin-protein ligase which accepts ubiquitin from an E2 ubiquitin-conjugating enzyme in the form of a thioester and then directly transfers the ubiquitin to targeted substrates. Modulates amyloplast dynamics and sedimentation in statocytes during inflorescence, hypocotyl and root gravitropism, probably by regulating amyloplast interaction with actin filaments (AFs) in endodermal cells.