Linked Life Data

3275649

Source:http://linkedlifedata.com/resource/pubmed/id/3275649

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1988-2-17
pubmed:databankReference
pubmed:abstractText
S1 mapping on the VAS1 structural gene indicates the existence of two classes of transcripts initiating at distinct in-frame translation start codons. The longer class of VAS1 transcripts initiates upstream of both ATG codons located 138 base pairs away and the shorter class downstream of the first ATG. A mutation that destroys the first AUG on the long message results in respiratory deficiency but does not affect viability. Mutation of the ATG at position 139 leads to lethality because the initiating methionine codon of the essential cytoplasmic valyl-tRNA synthetase has been destroyed. N-terminal protein sequence data further confirm translation initiation at ATG-139 for the cytoplasmic valyl-tRNA synthetase. From these results, we conclude that the VAS1 single gene encodes both mitochondrial and cytoplasmic valyl-tRNA synthetases. The presequence of the mitochondrial valyl-tRNA synthetase shows amino acid composition but not the amphiphilic character of imported mitochondrial proteins. From mutagenesis of the ATG-139 we conclude that the presequence specifically targets the cytoplasmically synthesized mitochondrial valyl-tRNA synthetase to the mitochondrial outer membrane and prevents binding of the enzyme core to cytoplasmic tRNAVal.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
263
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
52-7
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
The yeast VAS1 gene encodes both mitochondrial and cytoplasmic valyl-tRNA synthetases.
pubmed:affiliation
Institut de Biologie Moleculaire et Cellulaire, Laboratoire de Biochimie, Strasbourg, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't