title: The response of Pyruvate Kinase From The Intertidal Red Alga Porphyra umbilicalis to Sodium and Potassium Ions.
abstract: The effects of high concentrations of KCl and NaCl on the activity of PK from Porphyra umbilicalis were studied in crude extracts. The results indicate an inhibition of the enzyme by Na(+) and a considerable tolerance of the enzyme to K(+). This behaviour is interpreted as an adaptation to high K(+) and low Na(+) levels in the cytoplasm, which have been revealed in earlier studies.
authors.affiliation: Botanisches Institut der Tierärztlichen Hochschule Hannover, Bünteweg 17 D, D-3000 Hannover 71, F.R.G.
authors.forename: C
authors.initials: C
authors.lastname: Wiencke