Proteolytic Enzymes from Extremely Halophilic Bacteria

Proteolytic enzymes from extremely halophilic bacteria.

Halobacterium strains produce a truly extracellular proteinase which degrades gelatine and casein. It has a pH optimum of about 8 and depends upon divalent cations and a high concentration of NaCl or KC1 for activity and stability. Proteolytic enzymes were also found in cell homogenates obtained by ultra sonic treatment. A caseinolytic enzyme, probably different from the extracellular one, is a...

Extremely halophilic bacteria in crystallizer ponds from solar salterns.

It is generally assumed that hypersaline environments with sodium chloride concentrations close to saturation are dominated by halophilic members of the domain Archaea, while Bacteria are not considered to be relevant in this kind of environment. Here, we report the high abundance and growth of a new group of hitherto-uncultured Bacteria in crystallizer ponds (salinity, from 30 to 37%) from mul...

Salt-dependent properties of proteins from extremely halophilic bacteria.

Extremely halophilic denitrifying bacteria from hypersaline inland lakes, Halovibrio denitrificans

Correspondence D. Yu. Sorokin [email protected] or [email protected] Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Octyabrya 7/2, 117811 Moscow, Russia Department of Environmental Biotechnology, Delft University of Technology, Julianalaan 67, 2628 BC Delft, The Netherlands Institute of Microbiology and Biotechnology, Rheinische Friedrich-Wilhelms ...

The Proteolytic Enzymes of Bacteria

A great deal of work has been done on the proteolytic enzymes of bacteria, especially those enzymes which are secreted into the medium by the living cell or as the result of its autolysis. The proteolytic enzymes of the cells themselves, however, have been less studied. Studies on bacterial peptidases in which substrates of known formulae (such as synthetic peptides) have been used, are few and...