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Heat-stable proteins from hyperthermophilic microorganisms are ideally suited for investigating protein stability and evolution. We measured with differential scanning calorimetry and optical absorption spectroscopy the thermal stability of [4Fe-4S] ferredoxin from Thermotoga maritima (tfdx), which is a small electron transfer protein. The results are consistent with two-state unfolding at the record...
The eye lens protein and chaperonin, α-crystallin, was studied by differential scanning microcalorimetry, spectroscopy and size exclusion chromatography. The thermal transition of α-crystallin proceeds at T trs = 59.8 ± 0.6°C with an enthalpy change of ΔH = 336 ± 9 kJ per mol subunit. Disagreement between previous ΔH values could be attributed to a side reaction that leads, depending...
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