Grossmann, NinaVakkasoglu, AhmetHulpke, SabineAbele, RupertGaudet, RachelleTampé, Robert2015-03-122014Grossmann, Nina, Ahmet Selim Vakkasoglu, Sabine Hulpke, Rupert Abele, Rachelle Gaudet, and Robert Tampé. 2014. "Mechanistic Determinants of the Directionality and Energetics of Active Export by a Heterodimeric ABC Transporter." Nature Communications 5:5419.2041-1723http://nrs.harvard.edu/urn-3:HUL.InstRepos:14121878The ATP-binding cassette (ABC) transporter associated with antigen processing (TAP) participates in immune surveillance by moving proteasomal products into the endoplasmic reticulum (ER) lumen for major histocompatibility complex class I loading and cell surface presentation to cytotoxic T cells. Here we delineate the mechanistic basis for antigen translocation. Notably, TAP works as a molecular diode, translocating peptide substrates against the gradient in a strict unidirectional way. We reveal the importance of the D-loop at the dimer interface of the two nucleotide-binding domains (NBDs) in coupling substrate translocation with ​ATP hydrolysis and defining transport vectoriality. Substitution of the conserved ​aspartate, which coordinates the ATP-binding site, decreases NBD dimerization affinity and turns the unidirectional primary active pump into a passive bidirectional nucleotide-gated facilitator. Thus, ​ATP hydrolysis is not required for translocation per se, but is essential for both active and unidirectional transport. Our data provide detailed mechanistic insight into how heterodimeric ABC exporters operate.en-USImmunologyATPTransportBiochemistryCrystallographyJournal Article2015-03-1210.1038/ncomms6419