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. 1973 Jun;114(3):1336–1345. doi: 10.1128/jb.114.3.1336-1345.1973

Membranes of Bacillus stearothermophilus: Factors Affecting Protoplast Stability and Thermostability of Alkaline Phosphatase and Reduced Nicotinamide Adenine Dinucleotide Oxidase

Charlene Wisdom a,1, N E Welker a
PMCID: PMC285397  PMID: 4145864

Abstract

Protoplasts of Bacillus stearothermophilus NCA 1503-4R are resistant to osmotic rupture and are not sensitive to mechanical manipulation. Protoplast stability is maintained by divalent cations. The thermostability of protoplasts is enhanced when the cells are grown at elevated temperatures. The membrane content of the cell and the protein-to-lipid ratio of the membrane increases as the growth temperature is increased. The membrane-bound nicotinamide adenine dinucleotide (reduced form) oxidase system from cultures grown at 70 C was more thermostable than the same enzyme system from cultures grown at 55 C. Alkaline phosphatase was resistant to thermal inactivation in the intact protoplast. The extent of this protection is dependent on protoplast stability.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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