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Volume 8, Issue 8, Pages (August 2000)

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Volume 8, Issue 8, Pages 809-815 (August 2000) Protein–protein recognition, hydride transfer and proton pumping in the transhydrogenase complex1 Patrick A Buckley, J Baz Jackson, Thomas Schneider, Scott A White, David W Rice, Patrick J Baker Structure Volume 8, Issue 8, Pages 809-815 (August 2000) DOI: 10.1016/S0969-2126(00)00171-4

Figure 1 The dI component of transhydrogenase. (a) A stereo representation of the Cα backbone of a single subunit. (b) A cartoon of the dI dimer, viewed down the twofold axis, showing the NAD+ (magenta ball and sticks) bound to each subunit. (c) The final (2Fo–Fc) electron density map, contoured at 0.7 σ, around the NAD+ bound to the most closed subunit D. Structure 2000 8, 809-815DOI: (10.1016/S0969-2126(00)00171-4)

Figure 2 A comparison of the mode of NAD+ binding to dI.2 of transhydrogenase (blue protein /magenta NAD+) with that to domain 2 of alanine dehydrogenase (green/yellow). The flexible loop in dI (residues 221–240) which orders on NAD+ binding is red. Structure 2000 8, 809-815DOI: (10.1016/S0969-2126(00)00171-4)

Figure 3 (a) Close up of the nicotinamide-binding site in the intermediate state (subunit A) of dI, showing the carboxyamide interacting with the pyrophosphate and the invariant residues Tyr235 and Asp135. (b) In the closed state of dI (subunit D), the nicotinamide swings round to adopt the anti conformer, and packs against Gln132. In this subunit Arg127 is ordered and interacts with Tyr235 and Asp135. Structure 2000 8, 809-815DOI: (10.1016/S0969-2126(00)00171-4)

Figure 4 (a,b) Views of the docked structures of the D subunit dI (blue) and dIII (gold) components of transhydrogenase. The C4 of the nicotinamide ring of the dI NAD+ (magenta) is ∼3.0 Å from its counterpart on the NADP+ bound to dIII (green). The sidechains of residues identical, or strongly conserved, in the dI and dIII components from different species are coloured red and yellow, respectively. Residues from the twofold-related subunit of dI, which impinge on the hydride transfer site, can be seen coloured cyan (conserved residues in grey). Structure 2000 8, 809-815DOI: (10.1016/S0969-2126(00)00171-4)

Figure 5 A schematic representation of the possible orientation of the transhydrogenase complex with respect to the membrane. The dI dimer (blue/cyan) and its two associated dIII components (gold) lie above the membrane (green lipids, red head groups) with the two dII components (blue ovals) interacting with the dIII components. Structure 2000 8, 809-815DOI: (10.1016/S0969-2126(00)00171-4)