3rrb | pdb_00003rrb

Crystal structure of tm0922, a fusion of a domain of unknown function and ADP/ATP-dependent NAD(P)H-hydrate dehydratase from Thermotoga maritima in complex with AMP

spinqualitylabelsall models 3rrb, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3rrb is a 2 chain structure with sequence from Atcc 43589 and Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AMP, K Related: 2ax3 Gene: tm0922, TM_0922 (ATCC 43589) Activity: ATP-dependent NAD(P)H-hydrate dehydratase, with EC number 4.2.1.93 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [NNR_THEMA] Bifunctional enzyme that catalyzes the epimerization of the S- and R-forms of NAD(P)HX and the dehydration of the S-form of NAD(P)HX at the expense of ADP, which is converted to AMP. This allows the repair of both epimers of NAD(P)HX, a damaged form of NAD(P)H that is a result of enzymatic or heat-dependent hydration (By similarity). Publication Abstract from PubMed Proteins of unknown function comprise a significant fraction of sequenced genomes. Defining the roles of these proteins is vital to understanding cellular processes. Here, we describe a method to determine a protein function based on the identification of its natural ligand(s) by the crystallographic screening of the binding of a metabolite library, followed by a focused search in the metabolic space. The method was applied to two protein families with unknown function, PF01256 and YjeF_N. The PF01256 proteins, represented by YxkO from Bacillus subtilis and the C-terminal domain of Tm0922 from Thermotoga maritima, were shown to catalyze ADP/ATP-dependent NAD(P)H-hydrate dehydratation, a previously described orphan activity. The YjeF_N proteins, represented by mouse apolipoprotein A-I binding protein and the N-terminal domain of Tm0922, were found to interact with an adenosine diphosphoribose-related substrate and likely serve as ADP-ribosyltransferases. Crystallographic screening of metabolites serves as an efficient tool in functional analyses of uncharacterized proteins. Identification of Unknown Protein Function Using Metabolite Cocktail Screening.,Shumilin IA, Cymborowski M, Chertihin O, Jha KN, Herr JC, Lesley SA, Joachimiak A, Minor W Structure. 2012 Aug 28. PMID:22940582 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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