4qs8

Arabidopsis Hexokinase 1 (AtHXK1) structure in ligand-free form

spinqualitylabelsall models 4qs8, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4qs8 is a 1 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.798Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HXK1_ARATH Fructose and glucose phosphorylating enzyme. May be involved in the phosphorylation of glucose during the export from mitochondrion to cytosol. Acts as sugar sensor which may regulate sugar-dependent gene repression or activation. Mediates the effects of sugar on plant growth and development independently of its catalytic activity or the sugar metabolism. May regulate the execution of program cell death in plant cells. Publication Abstract from PubMed Hexokinase 1 from Arabidopsis thaliana (AtHXK1) plays a dual role in glycolysis and sugar sensing for vital metabolic and physiological processes. The uncoupling of glucose signalling from glucose metabolism was demonstrated by the analysis of two mutants (AtHXK1(G104D) and AtHXK1(S177A)) that are catalytically inactive but still functional in signalling. In this study, substrate-binding experiments indicate that the two catalytically inactive mutants have a high affinity for glucose, and an ordered substrate-binding mechanism has been observed for wild-type AtHXK1. The structure of AtHXK1 was determined both in its inactive unliganded form and in its active glucose-bound form at resolutions of 1.8 and 2.0 A, respectively. These structures reveal a domain rearrangement of AtHXK1 upon glucose binding. The 2.1 A resolution structure of AtHXK1(S177A) in the glucose-bound form shows similar glucose-binding interactions as the wild type. A glucose-sensing network has been proposed based on these structures. Taken together, the results provide a structural explanation for the dual functions of AtHXK1. Biochemical and structural study of Arabidopsis hexokinase 1.,Feng J, Zhao S, Chen X, Wang W, Dong W, Chen J, Shen JR, Liu L, Kuang T Acta Crystallogr D Biol Crystallogr. 2015 Feb;71(Pt 2):367-75. doi:, 10.1107/S1399004714026091. Epub 2015 Jan 23. PMID:25664748 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hexokinase 3D structures

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