Brassinosteroid transport

TIR1 proteins are F-box proteins that have three different domains giving them the ability to bind to three different ligands: an SCF TIR1 ubiquitin ligase complex (using the F-box domain), auxin [15] (so TIR1 proteins are auxin receptors), and Aux/IAA proteins (via a degron domain). Upon binding of auxin, a TIR1 protein's degron domain has increased affinity for Aux/IAA repressor proteins, which when bound to TIR1 and its SCF complex undergo ubiquitination and subsequent degradation by a proteasome . The degradation of Aux/IAA proteins frees ARF proteins to activate or repress genes at whose promoters they are bound. [16]

Brassinosteroid transport

brassinosteroid transport

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