objective(s): investigation of acute effect on cellular bioenergetics provides the opportunity to characterize the possible adverse effects of drugs more comprehensively. this study aimed to investigate the changes in biochemical and biophysical properties of heart mitochondria induced by captopril and nifedipine antihypertensive treatment. materials and methods: male, 12-week-old wistar rats i...

UNLABELLED An analysis of the distribution of the Na(+)-translocating ATPases/ATP synthases among microbial genomes identified an atypical form of the F(1)F(o)-type ATPase that is present in the archaea Methanosarcina barkeri and M. acetivorans, in a number of phylogenetically diverse marine and halotolerant bacteria and in pathogens Burkholderia spp. In complete genomes, representatives of thi...

Bafilomycins and concanamycins, two groups of the plecomacrolide-defined class of macrolide antibiotics, have recently been recognized as important tools for studying the physiological role of vacuolar-type, proton-translocating ATPases (V-ATPases) and ATPases with phosphorylated states (P-ATPases) in animal and plant cells as well as in yeast, fungi and bacteria. The following review will give...

By combining structural and phylogenetic analyses, we have earlier clarified the evolutionary relationships among membrane enzymes that couple the transmembrane transfer of protons or sodium ions with the synthesis/hydroly-sis of ATP. A comparison of the structures of the sodium-dependent bacterial and archaeal ATPases revealed nearly identical sets of amino acids involved in sodium binding. Ph...

Protons migrate much faster than other ions through water, ice and water-lined membrane channels because they participate in hydrogen bonding and H/H20 exchange. Similarly, hydrogen bonding enables protons with amino, carbonyl, phosphoryl and sulfonyl residues to influence critically the charge, conformation and stability of proteins. Therefore, it is not surprising that regulation of proton co...

The proton-translocating, membrane ATPases of oral streptococci have been implicated in cytoplasmic pH regulation, acidurance, and cariogenicity. Membranes were isolated from Streptococcus mutans GS-5 and Streptococcus sanguis NCTC 10904 following salt-induced lysis of cells treated with lysozyme and mutanolysin. The ATPase activities of these membranes were 1.8 and 1.1 units per mg membrane pr...