Linked Life Data

3549732

Source:http://linkedlifedata.com/resource/pubmed/id/3549732

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
1987-5-6
pubmed:abstractText
The cloned carAB operon of Escherichia coli coding for the small and large subunits of carbamyl phosphate synthetase has been used to construct a recombinant plasmid with a 4.16 kilobase ClaI fragment of the car operon that lacks the major promoters, P1 and P2. The plasmid, pHN12, carries a functional carB gene. A mutant E. coli strain lacking both subunits of carbamyl phosphate synthetase when transformed with pHN12 overproduces the large subunit by 200-fold (8-10% of the cellular protein). The elevated levels of the large subunit enable the transformed cells to utilize NH3 but not glutamine as nitrogen donor for carbamyl phosphate synthesis. The large subunit has been purified from the overexpressing strain. The purified native large subunit is capable of synthesizing carbamyl phosphate from ammonia, HCO-3, and ATP. The kinetic properties of the large subunit compared with the holoenzyme indicate that the Michaelis constants of the large subunit for HCO-3 and ATP are modulated by its association with the small glutamine binding subunit.
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
262
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4382-6
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
In vivo synthesis of carbamyl phosphate from NH3 by the large subunit of Escherichia coli carbamyl phosphate synthetase.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.