DEG15 of plants dimerize in a Ca2+-dependent manner and alternate by this dimerization between a general degrading actifity and processing of peroxisomal targeting signal (PTS2). AtDEG15 has a loop within the proteasedomain and N-terminus and C-terminus with no sequenzhomology. DEG15-proteases separate in those of plants and those of mammals and cellular slime molds. Interaktion between the N-terminus (aa 1-20) of DEG15 and calmodulin-like-protein (CML3) is required for dimerization and is plant specific. By deletionconstructs the domainstructure of AtDEG15 was investigated in planta: apart from CML3-bindingdomain the N-terminus is involved in dimerization, the C-terminus and the loop within the proteasedomain in processing of PTS2. The structure of DEG15 is highly flexible, based on presence of clustered Pro, Gly and Ser. Therefor DEG15 is attributed to the intrinsically unstructured proteins, suggesting functional diversity.
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