Practice question

Question

You have purified a protein X and observed the following A. When run on a native PAGE, it gives rise to a single band. B. When run on a nonreducing SDSPAGE, you obtain two bands corresponding to 40kDa and 60kDa C. When run on a reducing SDS page you get three bands corresponding to 60kDa, 30kDa, and 10kDa What can you conclude about the purified protein X?