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The kinetics of unphosphorylated, phosphorylated and proteolytically modified fructose bisphosphatase from rat liver

Ek, Pia (author)
Uppsala universitet,Institutionen för medicinsk och fysiologisk kemi,engström lorentz
Dahlqvist-Edberg, Ulla (author)
Uppsala universitet,Institutionen för medicinsk och fysiologisk kemi,engström lorentz
 (creator_code:org_t)
1981
1981
English.
In: Biochimica et Biophysica Acta. - 0005-2744. ; 662:2, s. 265-270
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Phosphorylation of fructose-bisphosphatase (D-fructose-1,6-bisphosphate 1-phosphohydrolase, EC 3.1.3.11) by the catalytic subunit of cyclic AMP-dependent protein kinase from pig muscle decreased the K0.5 for fructose-bisphosphate from 21 to 11 microM. When the phosphorylated fructose-bisphosphatase was treated with trypsin the K0.5 increased to 22 microM. The K0.5 also increased when the phosphoenzyme was treated with a partially purified phosphatase from rat liver. There was no difference between the unphosphorylated and phosphorylated enzyme with respect to pH dependence, the pH optimum being about 7.0 for both. Limited treatment of fructose-bis-phosphatase with subtilisin, which cleaves the enzyme at its unphosphorylatable N-terminal part, increased the pH optimum more than limited treatment with trypsin, which releases the phosphorylated peptide at the C-terminal part of fructose-bisphosphatase. The phosphorylated site on the phosphorylated fructose-bisphosphatase was more easily split off by trypsin treatment than the corresponding unphosphorylated site. The results suggest in addition to the glucagon-induced phosphorylation of fructose-bisphosphatase described by Claus et al. [1] that the phosphorylation-dephosphorylation of fructose-bisphosphatase could be of importance for the hormonal regulation of the enzyme in vivo.

Subject headings

NATURVETENSKAP  -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)

Keyword

Phosphorylation
fructose-bisphosphatase kinetics
(rat liver)

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ref (subject category)
art (subject category)

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