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Circular Dichroism Studies on the Deinococcus radiodurans Nudix Hydrolase DR_0079: An Atypical Thermal Melt

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The crystal structure for the Deinococcus radiodurans Nudix protein DR_0079 was recently determined in the metal-free form at 1.9 Å resolution (2O5F). The protein adopts the fundamental fold common to the Nudix family of proteins, a large mixed β-sheet sandwiched between the α-helix of the “Nudix box” and a second α-helix. The protein's physical properties were further characterized by circular dichroism (CD) spectroscopy. A CD thermal melt at 220 nm indentifies an inflection point at ∼52°C. However, unlike typical CD thermal melts, the negative ellipticity at 220 nm becomes more negative upon passing through the inflection point. Both NMR spectroscopy and size exclusion chromatography indicate that heating effects the irreversible formation of a large molecular weight complex. After cooling, the negative ellipiticity at 220 nm increases further, and overall, the CD spectrum at 25°C suggests that heat-treated DR_0079 has more α-helical and β-sheet structure than non-heat treated DR_0079.

Keywords: Circular dichroism spectroscopy; NMR spectroscopy; Nudix hydrolase; polyphosphate pyrophosphohydrolase; protein aggregation; protein refolding; thermal stability

Document Type: Research Article


Publication date: July 1, 2010

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.

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