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In general, mutagenesis studies reveal that methionine ligation raises the reduction potential by 100 200 mV, relative to histidine ligation, primarily due to the lower affinity of thioether to the higher oxidation state of the heme, and that the effect is generally additive.
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Consistently, one of the most important factors in raising the reduction potentials of the cytochromes is the extent of heme burial in the protein or, alternatively, the extent of solvent exposure of the heme.
First, it can shield the copper site from water, raising the reduction potential and lowering the reorganization energy for ET. More importantly, the extensive H-bond network surrounding it can fine-tune the properties of the T1 copper site.
For instance, by comparison and selective mutagenesis of the structurally homologous cyts c6 and c6A, it was demonstrated that the interaction of the positive dipole of the amide group of a carefully positioned glutamine (residues 52 in c6 and 51 in c6A) with the heme is a strategy used by Nature to raise the reduction potential by ∼100 mV.
Formation of a 4c intermediate was shown to stabilize the singly occupied redox-active Co 3d z -based molecular orbital and thus to raise the reduction potential by an estimated ≥250 mV, to within the range of those of biologically available reductants.
However, the existing commercial ejectors do not meet the practical operating requirements of the PEMFC system with the humidified hydrogen recirculation since the included water raises the ejector performance reduction and accompanying operating limits.
This raises the possibility that reduction of Roc1a gene dose in females affects meiotic chromosome segregation.
Because these are the same isoforms that were protective when overexpressed, this observation raises the possibility that reduction of 14-3-3 14-3-3 14-3-3y contributexpressionrogression of PD.
This raises the possibility that the reduction of the LVMV-ratio in pioglitazone-treated patients may result from local effects of pioglitazone on epicardial adipocytes rather than a systemic effect on circulating activin A levels.
This raises the possibility that the reduction in Na current is due to a relatively specific effect on Na channels rather than a generalized effect on all ion channels.
Nowadays, SoS is contributing to generate big data and raises the need for data reduction.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com