Linked Life Data

207801

Source:http://linkedlifedata.com/resource/pubmed/id/207801

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1978-8-28
pubmed:abstractText
Lung cell-free homogenate, which contains about twice the units of phosphatidate phosphohydrolase per mg of protein compared to liver, was fractionated by differential centrifugation and the fractions were assayed for phosphatidate phosphohydrolase and marker enzymes of endoplasmic reticulum, mitochondria, and lysosomes. Over 60% of the lung phosphatidate phosphohydrolase was associated with the endoplasmic reticulum, compared to 50% of the total liver enzyme. Thus a major portion of the more active lung enzyme is potentially involved in lipid biosynthesis by the endoplasmic reticulum. Less than 0.2% of the total lung enzyme was found in a lamellar body fraction, consistent with previous findings. The lung microsomal phosphohydrolase was specific for lipid substrates, showing equal activity towards phosphatidic acid or lysophosphatidic acid and relatively low activities towards glycerophosphates. It had a neutral pH optimum, similar to the liver enzyme, but differed somewhat in its relative activity at extremes of pH. Stability at 65 degrees C was greater for the lung enzyme. Fluroide inhibited lung (or liver) microsomal phosphatidate phosphohydrolase, while tartrate, MgCl2, or EDTA had no effect. The presence of a high activity of phosphatidate phosphohydrolase in lung endoplasmic reticulum is consistent with the rapid synthesis of pulmonary surfactant phosphatidylcholine.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-2275
pubmed:author
pubmed:issnType
Print
pubmed:volume
19
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
467-77
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1978
pubmed:articleTitle
Pulmonary surfactant synthesis. A highly active microsomal phosphatidate phosphohydrolase in the lung.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.