Linked Life Data

9643551

Source:http://linkedlifedata.com/resource/pubmed/id/9643551

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1998-9-10
pubmed:abstractText
The Escherichia coli regulatory protein StpA bears striking similarity to the chromatin-associated protein H-NS. These two proteins have many structural, functional and mechanistic parallels. Although H-NS is more abundant in the cell, both proteins act as transcriptional regulators, both bind to curved DNA and both restrain DNA supercoils. However, StpA is better able to promote RNA annealing and trans-splicing in vitro. In this study, phylogenetic analyses and experiments to examine the protease sensitivity of StpA and H-NS suggest a similar structure for the two proteins. Both proteins consist of two structured domains separated by an exposed protease-sensitive linker. The N-terminal (StpA-NterL) and C-terminal (StpA-CterL) domains of StpA, as well as the full-length StpA and H-NS proteins, were cloned, overproduced in E. coli and purified to homogeneity. StpA-CterL, but not StpA-NterL, promotes strand annealing of complementary RNA oligonucleotides and in vitro trans-splicing of a model group I intron. Both StpA and StpA-CterL exhibited stronger RNA-modulating activity than H-NS. Phylogenetic analyses showed that the N-terminal and C-terminal domains can exist autonomously. The phylogenetic and experimental data are compatible with a two-domain model for StpA and H-NS, with independently functioning modules joined by a non-conserved linker, and with the observed RNA-related activities residing entirely within the C-terminal domain.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0950-382X
pubmed:author
pubmed:issnType
Print
pubmed:volume
28
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
847-57
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Domain structure and RNA annealing activity of the Escherichia coli regulatory protein StpA.
pubmed:affiliation
Wadsworth Center, New York State Department of Health and School of Public Health, State University of New York at Albany, 12201-2002, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.