Effects of solubilisation on some properties of the membrane-bound respiratory enzyme D-amino acid dehydrogenase of Escherichia coli

Solubilisation, delipidation and partial purification of the membrane-bound enzyme. D-amino acid dehydrogenase of Escherichia coli K 12 produced significant changes in several of its properties. Solubilised enzyme showed a broader substrate specificity, increased affinity for at least three substrat...

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Veröffentlicht in:FEBS letters 1983-01, Vol.151 (2), p.189-192
Hauptverfasser: Jones, H., Venables, W.A.
Format: Artikel
Sprache:eng
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Zusammenfassung:Solubilisation, delipidation and partial purification of the membrane-bound enzyme. D-amino acid dehydrogenase of Escherichia coli K 12 produced significant changes in several of its properties. Solubilised enzyme showed a broader substrate specificity, increased affinity for at least three substrates, and a lower pH optimum with D-alanine as substrate. Solubilised enzyme was more heat-labile than native enzyme, particularly at 37°C, and re-binding to envelope preparations restored protection against heat denaturation. Activity of delipidated enzyme could be increased by addition of pure phospholipids. Native enzyme showed biphasic Arrhenius kinetics associated with phase changes of membrane lipids.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(83)80066-0