Mechanism of Nucleotide Binding Domain engine in ABC transporters

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Physiologically important ABC transporters share Nucleotide Binding Domain (NBD) to make a driving force for displaying their functions. From a series of functional data, we proposed a putative structure of the NBD engine of CFTR in one of the transitional states during its gating cycle. We also suggested a possibility that NBD engine utilized thermal motion energy of water molecules as well as ATP-hydrolysis energy. In addition, we obtained a reconstituted three dimensional structure of CFTR using a single particle analysis, which leads us to an upcoming direct observations of conformational changes of NBD engine.