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. 1976 Feb;125(2):501–508. doi: 10.1128/jb.125.2.501-508.1976

Extracellular and protease-released pullulanases.

C J Brandt, B J Catley, W M Awad Jr
PMCID: PMC236108  PMID: 942714

Abstract

The extracellular form of pullulanase (EC 3.2.1.41) from Klebsiella aerogenes has been purified to homogeneity by successive chromatography through diethylaminoethyl-cellulose, Sephadex G-200, and 1,6-diaminohexane-Sepharose. In addition, the cell-bound form of pullulanase has been released by the action of a serine endopeptidase obtained from Pronase and purified to apparent homogeneity. Protease-released pullulanase has a slightly larger molecular weight and a specific activity over twice that of the extracellular protein. The properties of each of these forms of pullulanase have been compared with those reported for the detergent-released form. Each form has different features as examined by amino acid composition, specific activity, molecular weight, or inhibition pattern, which distinguish it from the other pullulanases. It is hypothesized that a single gene product consisting of a single polypeptide chain generates these different enzyme forms after selective cleavages by endogenous or applied proteases.

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Selected References

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