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In these complexes UBI preserves most of its native fold. At 10-12 SDS per UBI, which remains below the critical micelle concentration under our conditions, UBI-covered SDS micelles form with four UBIs around a core of 40 SDSs. This implies a protein-assisted micellization and an associated unfolding of UBI involving a change from mainly β-strands to mainly α-helical secondary structure. As [SDS] is increased, the complex gradually changes so that finally only one UBI covers one micelle with a similar number of SDS molecules at SDS satur