Linked Life Data

10215065

Source:http://linkedlifedata.com/resource/pubmed/id/10215065

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1999-6-22
pubmed:abstractText
Holocarboxylase synthetase is one of two enzymes known to be involved in the metabolism of biotin. It catalyses the fixation of biotin to inactive apocarboxylases yielding active carboxylases. Deficiency of this enzyme leads to multiple carboxylase deficiency which is fatal in the absence of prompt diagnosis and treatment with biotin. In a pregnancy at risk for deficiency of holocarboxylase synthetase prenatal diagnosis was performed by assay of the enzyme in amniocytes. The Km for biotin was 62.8 nM which was 12 times the control value of 5.0 nM. The Vmax was 2 per cent of the control value. This was confirmed by assay of the activity of propionyl CoA carboxylase (20-26 per cent control), 3-methylcrotonyl CoA carboxylase (14-19 per cent control) and pyruvate carboxylase (12-30 per cent control) and demonstration of biotin responsiveness in vitro. All carboxylase activities were restored to 51-58 per cent of control when amniocytes were cultured in medium containing 1 microM biotin. Diagnosis was ultimately confirmed by assay of holocarboxylase synthetase in lymphocytes from the infant after birth. The Km for biotin of the holocarboxylase synthetase of the infant was 60.3 nM while that of a parallel control was 6.9 nM. Prenatal treatment of the mother with biotin led to a concentration of biotin of 240 nM in the serum of the infant at birth that was four times the Km of the enzyme for biotin. The infant was clinically well at birth, and organic acid analysis of the blood and urine revealed no accumulation of the characteristic metabolites.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0197-3851
pubmed:author
pubmed:issnType
Print
pubmed:volume
19
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
108-12
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Prenatal diagnosis and treatment of holocarboxylase synthetase deficiency.
pubmed:affiliation
Department of Pediatrics and Institute for Molecular Genetics, University of California, San Diego, La Jolla 92093-0830, USA. thuyle@ucsd.edu
pubmed:publicationType
Journal Article, Case Reports