Purification and properties of serine protease from Halobacterium halobium.

AUTOR(ES)

Izotova, L S

RESUMO

Pure extracellular serine protease was isolated from the culture filtrate of Halobacterium halobium by bacitracin-Sepharose affinity chromatography. The enzyme activity was completely and irreversibly lost if the NaCl concentration fell below 2 M. The protease consists of one polypeptide chain with a molecular weight of 41,000. It is characteristically enriched in Asx and Glx content, whereas the level of basic amino acids in the enzyme molecule is unusually low. The protease shows a preference for leucine in the carboxylic side of the scissile bond of the substrate, cleaving the B-chain of oxidized bovine insulin only at the Leu15-Tyr16 bond and liberating p-nitroaniline from L-pyroglutamyl-L-alanyl-L-alanyl-L-leucine-p-nitroanilide.

Documentos Relacionados

• Purification and characterization of a mesohalic catalase from the halophilic bacterium Halobacterium halobium.
• Selection and properties of phototaxis-deficient mutants of Halobacterium halobium.
• Chemosensory responses of Halobacterium halobium.
• Polyadenylated RNA isolated from the archaebacterium Halobacterium halobium.
• Genetic variability in Halobacterium halobium.