Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
21
pubmed:dateCreated
1997-1-13
pubmed:abstractText
The efficient export of proteins through the cytoplasmic membrane of Escherichia coli requires chaperones to maintain protein precursors in a translocation-competent conformation. In addition to SecB, the major chaperone facilitating export of particular precursors, heat shock-induced chaperones DnaK-DnaJ and GroEL-GroES are also involved in this process. By use of secB'-lacZ gene fusions and immunoprecipitation experiments, SecB production was studied in E. coli strains containing conditional lethal mutations in chaperone or sec genes. While the loss of heat shock chaperones resulted in an increased production of SecB, mutations in sec genes showed only minor effects on SecB synthesis. Neither the plasmid-mediated overexpression of precursors of exoproteins nor the overexpression of secB altered the synthesis of SecB. These results suggest that under conditions where chaperones become depleted, E. coli responds by raising the expression of secB. These data confirm the supposed synergy of different chaperones involved in protein export.
pubmed:commentsCorrections
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pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0021-9193
pubmed:author
pubmed:issnType
Print
pubmed:volume
178
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6097-104
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1996
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