4tvt

New ligand for thaumatin discovered using acoustic high throughput screening

spinqualitylabelsall models 4tvt, resolution 1.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4tvt is a 1 chain structure with sequence from Thaumatococcus daniellii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.2Å Ligands: ASC, NA, TLA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function THM1_THADA Taste-modifying protein; intensely sweet-tasting. It is 100000 times sweeter than sucrose on a molar basis. Publication Abstract from PubMed We describe a high throughput method for screening up to 1728 distinct chemicals with protein crystals on a single microplate. Acoustic droplet ejection (ADE) was used to co-position 2.5nL of protein, precipitant, and chemicals on a MiTeGen in situ-1 crystallization plate for screening by co-crystallization or soaking. ADE-transferred droplets follow a precise trajectory which allows all components to be transferred through small apertures in the microplate lid. The apertures were large enough for 2.5nL droplets to pass through them, but small enough so that they did not disrupt the internal environment created by the mother liquor. Using this system, thermolysin and trypsin crystals were efficiently screened for binding to a heavy-metal mini-library. Fluorescence and X-ray diffraction were used to confirm that each chemical in the heavy-metal library was correctly paired with the intended protein crystal. A fragment mini-library was screened to observe two known lysozyme ligands using both co-crystallization and soaking. A similar approach was used to identify multiple, novel thaumatin binding sites for ascorbic acid. This technology pushes towards a faster, automated, and more flexible strategy for high throughput screening of chemical libraries (such as fragment libraries) using as little as 2.5nL of each component. High throughput screening using acoustic droplet ejection to combine protein crystals and chemical libraries on crystallization plates at high density.,Teplitsky E, Joshi K, Ericson DL, Scalia A, Mullen JD, Sweet RM, Soares AS J Struct Biol. 2015 Jul;191(1):49-58. doi: 10.1016/j.jsb.2015.05.006. Epub 2015, May 29. PMID:26027487 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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