From Proteopedia
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Let's compare the maltose transporter crystallized in the proposed resting state (left, 3fh6) and catalytic intermediate (right, 2r6g).
Compare similar orientations of a single transporter, resting state , with inward-facing transmembrane domains (TMDs) and the nucleotide binding domains (NBDs) in an open state,
and catalytic intermediate , with outward-facing transmembrane domains (TMDs) and the nucleotide binding domains (NBDs) in a closed state, plus bound ATP and MalE (the maltose binding protein).