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Mannitol-1-Phosphate Dehydrogenase in Pseudevernia Furfuracea

Published online by Cambridge University Press:  28 March 2007

Manfred Jensen ,
Guido B. Feige  and
Anna Waterkotte
Manfred Jensen
Affiliation:
Botanisches Institut, Universitat-GHS-Essen, Universitatsstrafie 5, D-4300 Essen 1, Federal Republic of Germany.
Guido B. Feige
Affiliation:
Botanisches Institut, Universitat-GHS-Essen, Universitatsstrafie 5, D-4300 Essen 1, Federal Republic of Germany.
Anna Waterkotte
Affiliation:
Botanisches Institut, Universitat-GHS-Essen, Universitatsstrafie 5, D-4300 Essen 1, Federal Republic of Germany.
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Abstract

Mannitol-1-phosphate dehydrogenase [EC 1.1.1.17] activity was demonstrated in extracts of Pseudevernia furfuracea and Hypogymnia physodes. The reaction was found to be highly substrate specific for fructose-6-phosphate/NADH or mannitol-1-phosphate/NAD+. The pH optimum for fructose-6-phosphate reduction was 7.1, and apparent Km values were 1.2 mM for fructose-6-phosphate and 20 μM for NADH. The reaction did not require Mg++ or Ca++. For conversion of mannitol-1-phosphate into mannitol, the occurrence of mannitol-1-phosphatase in Pseudevernia furfuracea is postulated.

Type
Research Article
Information
The Lichenologist , Volume 23 , Issue 2 , April 1991 , pp. 187 - 196
Copyright
Copyright © British Lichen Society 1991

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