Recombinant, full length SAE1a of Arabidopsis thaliana, UniProt:Q8VY78-1, TAIR: At4g24940, overexpressed in E.coli
SAE1a (SUMO-activating enzyme subunit 1A) is the dimeric enzyme acts as an E1 ligase for SUMO1 and SUMO2. It mediates ATP-dependent activation of SUMO proteins and formation of a thioester with a conserved cysteine residue on SAE2. Functionally redundant