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- W1567843894 abstract "The Vitreoscilla hemoglobin protein has been implicated in earlier studies to serve a globin-like function under oxygen-limited growth conditions. Evidence is presented using fractionation as well as proteinase K accessibility techniques to prove that a considerable amount of this protein is localized in the periplasmic space of the cell. Genetic evidence points towards the existence of information within the N-terminal domain of the protein that plays a role in the process of protein export. However, this sequence is not cleaved in the process of translocation. Analysis of the primary structure of this region reveals several unusual features. Instead of positively charged residues at its amino terminus, it has a negative charge. The overall hydrophobicity of the central region of this sequence is significantly lower than in typical leader peptides due to the presence of a charged residue. In keeping with the likelihood that such an export signal may not be very efficient, a substantial fraction of the total cellular hemoglobin can also be detected in the cytoplasm. Heme is incorporated in both cytoplasmic and periplasmic globin as indicated by the ability of protein from both fractions to bind carbon monoxide. The secretion of this protein into the periplasm raises questions concerning the physiological significance of its localization. Dimensional analysis of a model based on the facilitated diffusion hypothesis, which was initially proposed to account for the effects of eukaryotic globins on oxygen transport, suggests that periplasmic globin can support an additional oxygen flux to the respiratory apparatus that may be physiologically significant." @default.
- W1567843894 created "2016-06-24" @default.
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- W1567843894 date "1989-11-01" @default.
- W1567843894 modified "2023-10-10" @default.
- W1567843894 title "Evidence for partial export of Vitreoscilla hemoglobin into the periplasmic space in Escherichia coli" @default.
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- W1567843894 doi "https://doi.org/10.1016/0022-2836(89)90292-1" @default.
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