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Hell’s Gate globin I (HGbI), a heme-containing protein structurally homologous to mammalian neuroglobins, has been identified from an acidophilic and thermophilic obligate methanotroph, Methylacidiphilum infernorum. HGbI has very high affinity for O 2 and shows barely detectable autoxidation in the pH range of 5.2–8.6 and temperature range of 25–50°C. Examination of the heme pocket by X-ray...
The globin-coupled sensors (GCSs) and protoglobins (Pgbs) form one lineage of the globin superfamily. The GCSs are multidomain sensory proteins involved in aerotaxis or gene regulation, while the Pgbs are single-domain globins of yet unknown function. We postulate that the GCSs and Pgbs share a common signaling mechanism to modulate diverse physiological functions. To elucidate the signaling properties...
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