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The oligomeric structure of TAPBb does not contain interchain disulfide bonds. Either 20 μg of enzyme extract (lanes 1 and 2) or 2 μg of purified TAPBb (lanes 3 and 4) was subjected to SDS-8% PAGE under reducing (2-ME +) or nonreducing (2-ME −) conditions. Samples in lanes 1 and 3 were heated (+), while those in lanes 2 and 4 were not (−). The gels were stained with Coomassie blue. Arrowheads and asterisks indicate positions of ∼300- and ∼50-kDa bands, respectively.
