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A source of apparent pyrophosphate:fructose 6-phosphate phosphotransferase activity in rabbit muscle phosphofructokinase.

Abstract：

:In the presence of UDPglucose, rabbit muscle phosphofructokinase appeared to use PPi as a phosphoryl donor, as reported previously (Biochem. Biophys. Res. Commun. 121, 842-847). This apparent activity was due to conversion of UDPglucose and PPi to glucose 1-phosphate and UTP, the latter being metabolized by phosphofructokinase. Auxiliary enzymes used in the assays were contaminated by UDPglucose pyrophosphorylase. This contamination was sufficient to account for, and had similar properties to, the apparent PPi-dependent activity. Without auxiliary enzymes phosphofructokinase could not use PPi. These findings indicate that the apparent interconversion of phosphofructokinase and PPi:fructose 6-phosphate phosphotransferase must be re-assessed.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Kruger NJ,Dennis DT

doi

10.1016/0006-291x(85)90608-4

subject

Has Abstract

pub_date

1985-01-16 00:00:00

pages

320-6

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(85)90608-4

journal_volume

126

pub_type

杂志文章

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