Hydrochloric acid (HCl) is an important mineral acid with many uses, including the pickling of steel, acid treatment of oil wells and chemical cleaning and processing. This acid is extremely corrosive and its aggressiveness can change drastically depending on its concentration, the temperature and contamination by oxidizing impurities. One of the most commonly encountered oxidizing impurities i...

The site of the reaction between horse heart ferrocytochrome c and ferricyanide was investigated by measuring the reaction rate of cytochrome c derivatives specifically modified at single lysine residues to form trifluoroacetyl or trifluoromethylphenylcarbamyl amino groups. Cytochrome c derivatives singly modified at lysines 8, 13, 25, 27, 72, 79, and 87 surrounding the heme crevice had rate co...

OpcA from Neisseria meningitidis, the causative agent of meningococcal meningitis and septicemia, is an integral outer membrane protein that facilitates meningococcal adhesion through binding the proteoglycan receptors of susceptible cells. Two structures of OpcA have been determined by x-ray diffraction to 2 A resolution, revealing dramatically different conformations in the extracellular loop...

The interaction between beef adrenodoxin and horse heart cytochrome c was studied by measuring the fluorescence emission of the single tyrosine at residue 82 of adrenodoxin. Addition of cytochrome c at low ionic strength (5 n m sodium morpholinosulfonate, pH 7.5) decreased the 331 nm fluorescence consistent with the formation of a 1:l adrenodoxin-cytochrome c complex with a dissociation constan...