2dpf

Crystal Structure of curculin1 homodimer

spinqualitylabelsall models 2dpf, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2dpf is a 4 chain structure with sequence from Molineria latifolia. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Resources: FirstGlance, OCA, RCSB, PDBsum Function [CURC_CURLA] Taste-modifying protein; sweet-tasting. After curculin, water elicits a sweet taste, and sour substances induce a stronger sense of sweetness. 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 Curculin isolated from Curculigo latifolia, a plant grown in Malaysia, has an intriguing property of modifying sour taste into sweet taste. In addition to this taste-modifying activity, curculin itself elicits a sweet taste. Although these activities have been attributed to the heterodimeric isoform and not homodimers of curculin, the underlying mechanisms for the dual action of this protein have been largely unknown. To identify critical sites for these activities, we performed a mutational and structural study of recombinant curculin. Based on the comparison of crystal structures of curculin homo- and heterodimers, a series of mutants was designed and subjected to tasting assays. Mapping of amino acid residues on the three-dimensional structure according to their mutational effects revealed that the curculin heterodimer exhibits sweet-tasting and taste-modifying activities through its partially overlapping but distinct molecular surfaces. These findings suggest that the two activities of the curculin heterodimer are expressed through its two different modes of interactions with the T1R2-T1R3 heterodimeric sweet taste receptor. Curculin exhibits sweet-tasting and taste-modifying activities through its distinct molecular surfaces.,Kurimoto E, Suzuki M, Amemiya E, Yamaguchi Y, Nirasawa S, Shimba N, Xu N, Kashiwagi T, Kawai M, Suzuki E, Kato K J Biol Chem. 2007 Nov 16;282(46):33252-6. Epub 2007 Sep 25. PMID:17895249 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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