Linked Life Data

16527408

Source:http://linkedlifedata.com/resource/pubmed/id/16527408

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2006-6-7
pubmed:abstractText
In Dictyostelium discoideum Ax2 l-erythro-tetrahydrobiopterin (BH4) is produced in much smaller amount than its stereoisomer d-threo-tetrahydrobiopterin (DH4), both of which are catalyzed by sepiapterin reductase (SR) at the terminal steps. In order to investigate their putative function and biosynthetic regulation, we performed quantitative analysis of not only the intracellular pteridines by HPLC but also the biosynthetic enzymes (GTP cyclohydrolase I, 6-pyruvoyltetrahydropterin synthase, SR, and aldose reductase-like enzyme) by Northern blot analysis and activity assay. We found that both SR transcript and activity increased in parallel with a remarkable decline in aldose reductase-like enzyme activity when BH4 increased transiently in the early development. Through in vitro assay of BH4/DH4 synthesis and in vivo rescue experiment of SR knockout mutant, we demonstrated that Dictyostelium SR favors DH4 synthesis while human SR does BH4 synthesis. The results suggest that Dictyostelium SR prefers 1'-oxo-2'-d-hydroxypropyl-tetrahydropterin to 6-pyruvoyltetrahydropterin as a substrate, thereby maintaining dominant production of DH4 over BH4 in sufficient supply of AR-like enzyme, while allowing increase of BH4 when SR prevails quantitatively over aldose reductase-like enzyme. On the other hand, a transient increase of BH4 may imply that BH4 has an independent function from DH4 in Dictyostelium.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0006-3002
pubmed:author
pubmed:issnType
Print
pubmed:volume
1760
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
877-82
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Functional role of sepiapterin reductase in the biosynthesis of tetrahydropteridines in Dictyostelium discoideum Ax2.
pubmed:affiliation
School of Biotechnology and Biomedical Science, Inje University, Kimhae 621-749, Korea.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't