1djl

THE CRYSTAL STRUCTURE OF HUMAN TRANSHYDROGENASE DOMAIN III WITH BOUND NADPTHE CRYSTAL STRUCTURE OF HUMAN TRANSHYDROGENASE DOMAIN III WITH BOUND NADP

Structural highlights 1djl is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: , , Activity: NAD(P)(+) transhydrogenase (B-specific), with EC number 1.6.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease [NNTM_HUMAN] Defects in NNT are the cause of glucocorticoid deficiency type 4 (GCCD4) [MIM:614736]. A rare, potentially lethal, autosomal recessive disorder characterized by resistance to ACTH action on the adrenal cortex, adrenal insufficiency and an inability of the adrenal cortex to produce cortisol. It usually presents in the neonatal period or in early childhood with episodes of hypoglycemia and other symptoms related to cortisol deficiency, including failure to thrive, recurrent illnesses or infections, convulsions, and shock. In a small number of patients hypoglycemia can be sufficiently severe and persistent that it leads to serious long-term neurological damage or death. The diagnosis is readily confirmed with a low plasma cortisol measurement in the presence of an elevated ACTH level, and normal aldosterone and plasma renin measurements. Function [NNTM_HUMAN] The transhydrogenation between NADH and NADP is coupled to respiration and ATP hydrolysis and functions as a proton pump across the membrane. May play a role in reactive oxygen species (ROS) detoxification in the adrenal gland. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Transhydrogenase, located in the inner membranes of animal mitochondria and the cytoplasmic membranes of bacteria, couples the transfer of reducing equivalents between NAD(H) and NADP(H) to proton pumping. The protein comprises three subunits termed dI, dII and dIII. The dII component spans the membrane. The dI component, which contains the binding site for NAD(+)/NADH, and the dIII component, which has the binding site for NADP(+)/NADPH, protrude from the membrane. Proton pumping is probably coupled to changes in the binding affinities of dIII for NADP(+) and NADPH. RESULTS: The first X-ray structure of the NADP(H)-binding component, dIII, of human heart transhydrogenase is described here at 2.0 A resolution. It comprises a single domain resembling the classical Rossmann fold, but NADP(+) binds to dIII with a reversed orientation. The first betaalphabetaalphabeta motif of dIII contains a Gly-X-Gly-X-X-Ala/Val 'fingerprint', but it has a different function to that in the classical Rossmann structure. The nicotinamide ring of NADP(+) is located on a ridge where it is exposed to interaction with NADH on the dI subunit. Two distinctive features of the dIII structure are helix D/loop D, which projects from the beta sheet, and loop E, which forms a 'lid' over the bound NADP(+). CONCLUSIONS: Helix D/loop D interacts with the bound nucleotide and loop E, and probably interacts with the membrane-spanning dII. Changes in ionisation and conformation in helix D/loop D, resulting from proton translocation through dII, are thought to be responsible for the changes in affinity of dIII for NADP(+) and NADPH that drive the reaction. The high-resolution structure of the NADP(H)-binding component (dIII) of proton-translocating transhydrogenase from human heart mitochondria.,White SA, Peake SJ, McSweeney S, Leonard G, Cotton NP, Jackson JB Structure. 2000 Jan 15;8(1):1-12. PMID:10673423 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also NAD(P) transhydrogenase

spinqualitylabelsall models 1djl, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image