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. 1971 Jan;105(1):93–100. doi: 10.1128/jb.105.1.93-100.1971

Selective Release of Proteins from Spirillum itersonii by Tris(hydroxymethyl)aminomethane and Ethylenediaminetetraacetate

W T Garrard 1
PMCID: PMC248326  PMID: 5541031

Abstract

Treatment of Spirillum itersonii with tris(hydroxymethyl)aminomethane (Tris)-ethylenediaminetetraacetate (EDTA) results in the quantitative release of alkaline phosphatase and ribonuclease into the surrounding medium. At the same time, about 90% of the total cellular soluble cytochrome c is liberated. This process occurs within 1 min of treatment at both 24 and 4 C. Release of these proteins by Tris-EDTA treatment is highly selective, since only 9% of the total cell protein is liberated, concomitantly with less than 5% ribonucleic acid, deoxyribonucleic acid, and malate dehydrogenase. Different sigmoidal curves are obtained for release of proteins as a function of EDTA concentration. The order of liberation with increasing EDTA is as follows: alkaline phosphatase, protein, soluble cytochrome c, and ribonuclease. Treatment of cells with Tris-EDTA under conditions which cause extensive loss of alkaline phosphatase, soluble cytochrome c, and ribonuclease results in cell death, with cessation of protein and ribonucleic acid synthesis. Cells treated with EDTA in phosphate buffer (in the absence of Tris) liberate a large portion of their soluble cytochrome c, but negligible amounts of alkaline phosphatase and ribonuclease. Addition of Tris to cells pretreated with phosphate-buffered EDTA releases high levels of alkaline phosphatase, but not ribonuclease. These results suggest that a common surface alteration is not solely responsible for release of periplasmic proteins. More likely, each protein of the periplasm is bound in an independent and specific manner.

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