Linked Life Data

2936741

Source:http://linkedlifedata.com/resource/pubmed/id/2936741

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1986-4-18
pubmed:abstractText
Phosphofructokinase from the liver fluke Fasciola hepatica was purified from extracts of the whole organisms. The molecular weight of the protomer as determined by sodium dodecyl sulfate-gel electrophoresis is 83,000. Phosphorylation of the liver fluke phosphofructokinase by the catalytic subunit of cAMP-dependent protein kinase occurred at a rate that was at least an order of magnitude greater than that observed with mammalian heart phosphofructokinase. The maximum level of phosphate incorporated was 0.22 mol P/mol of protomer. The kinetic properties of the enzyme were greatly altered as a result of phosphorylation. Compared to native enzyme, phosphorylated enzyme had a greater affinity for its substrate Fru-6-P and a decreased sensitivity to inhibition by ATP. These kinetic changes were similar to those of native enzyme in the presence of positive modifiers such as AMP. AMP also activated the phosphorylated enzyme. Activation of the phosphorylated enzyme by AMP was characterized by a further increase in affinity for Fru-6-P and a further decrease in sensitivity to ATP inhibition. Thus, the liver fluke phosphofructokinase can be modulated by covalent phosphorylation as well as noncovalent binding of different modifier ligands.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
261
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4346-51
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1986
pubmed:articleTitle
Phosphofructokinase in the liver fluke Fasciola hepatica. Purification and kinetic changes by phosphorylation.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.