Oxidase and periplasmic cytochrome assembly in Escherichia coli K-12: CydDC and CcmAB are not required for haem-membrane association

Article Abstract:

Research has been conducted on the mechanism used by bacteria to transport haem into cytoplasmic membrane. The movement of haem into and across lipid bilayers has been investigated.

United Kingdom, Statistical Data Included, Cell membranes, Lipid membranes, Microbiological research, Cytochromes, Bilayer lipid membranes

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Nisin stimulates oxygen consumption by Staphylococcus aureus and Escherichia coli

Article Abstract:

Experiments are performed to investigate the effects of nisin on the growth and respiration rates of Staphylococcus aureus and Escherichia coli cells. Results show that nisin stimulates oxygen consumption in S. aureus and E. coli cells by initiating a protonophore mode of action. The data also indicate that gram-negative cells are less sensitive to nisin than gram-positive cells.

Staphylococcus aureus, Bacterial genetics, Growth factors

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Reactions of the Escherichia coli flavohaemoglobin (Hmp) with NADH and near-micromolar oxygen: oxygen affinity of NADH oxidase activity

Article Abstract:

The Escherichia coli flavohaemoglobin (Hmp) is a soluble NADH oxidase with high oxygen (O2) affinity, as its oxidized form forms an oxygenated species with NADH even at sub-micromolar O2 levels. Hmp binds to O2 and reduces it to form a superoxide. A steady-state concentration of oxygenated Hmp is formed within 1 sec of mixing Hmp with O2. The flavin is in the oxidized state in oxygenated Hmp, but when the O2 is totally consumed, it is reduced to form deoxy Fe(II) haem. The kinetics and spectra of the production of oxygenated Hmp at high O2 levels are heterogeneous.

Chemical affinity

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