Abstract:
:Twelve different dominant negative mutants of the Escherichia coli nucleoid-associated protein, H-NS, have been selected and characterized in vivo. The mutants are all severely defective in promoter repression activity in a strain lacking H-NS, and they all disrupt the repression normally exerted by H-NS at two of its target promoters. From the locations of the alterations in these mutants, which result in both large truncations and amino acid substitutions, we propose that H-NAS contains at least two distinct domains. The in vitro protein-protein cross-linking data presented in this report indicate that the proposed N-terminal domain of H-NS has a role in H-NS multimerization. StpA is a protein with known structural and functional homologies to H-NS. We have analyzed the extent of these homologies by constructing and studying StpA mutants predicted to be dominant negative. Our data indicate that the substitutions and deletions found in dominant negative H-NS have similar effects in the context of StpA. We conclude that the domain organizations and functions in StpA and H-NS are closely related. Furthermore, dominant negative H-NS can disrupt the activity of native StpA, and reciprocally, dominant negative StpA can disrupt the activity of native H-NS. We demonstrate that the N-terminal domain of H-NS can be chemically cross-linked to both full-length H-NS and StpA. We account for these observations by proposing that H-NS and StpA have the ability to form hybrid species.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Williams RM,Rimsky S,Buc Hdoi
10.1128/jb.178.15.4335-4343.1996subject
Has Abstractpub_date
1996-08-01 00:00:00pages
4335-43issue
15eissn
0021-9193issn
1098-5530journal_volume
178pub_type
杂志文章abstract::SigB is an alternative sigma factor that controls a large regulon in Staphylococcus aureus. Activation of SigB requires RsbU, a protein phosphatase 2C (PP2C)-type phosphatase. In a closely related organism, Bacillus subtilis, RsbU activity is stimulated upon interaction with RsbT, a kinase, which following an activati...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01514-08
更新日期:2009-04-01 00:00:00
abstract::The filamentous cyanobacterium Anabaena sp. strain PCC 7120 forms a periodic pattern of nitrogen-fixing heterocysts when grown in the absence of combined nitrogen. PatA is necessary for proper patterning of heterocysts along filaments. In this study, apparent transcriptional start points (tsps) were identified at nucl...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.00577-10
更新日期:2010-09-01 00:00:00
abstract::A pentachlorophenol (PCP) hydroxylase which catalyzed the conversion of PCP to 2,3,5,6-tetrachlorohydroquinone and released iodide from triiodophenol in the presence of NADPH and oxygen was identified. The enzyme was purified by protamine sulfate precipitation, ammonium sulfate precipitation, hydrophobic chromatograph...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.173.14.4447-4453.1991
更新日期:1991-07-01 00:00:00
abstract::We have investigated the regulation of the operon encoding xylose utilization in Staphylococcus xylosus C2a and Staphylococcus carnosus TM300. For in vivo studies, transcriptional fusions of the xylAB regulatory region to the lipase gene from Staphylococcus hyicus were constructed. Repression of lipase activity depend...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.174.9.3042-3048.1992
更新日期:1992-05-01 00:00:00
abstract::An obligate thermophilic strain of Bacillus stearothermophilus, strain PH24, isolated from industrial sediment by elective culture, grew readily at 55 C on phenol or on one of the isomers of cresol as the major carbon source. Intact cells grown in the presence of phenol, o-cresol, m-cresol, or p-cresol were induced to...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.124.3.1077-1083.1975
更新日期:1975-12-01 00:00:00
abstract::We demonstrate that the expression of hem genes in Rhodobacter capsulatus is transcriptionally repressed in response to the exogenous addition of heme. A high-copy suppressor screen for regulators of hem gene expression resulted in the identification of an LysR-type transcriptional regulator, called HbrL, that regulat...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.188.4.1567-1576.2006
更新日期:2006-02-01 00:00:00
abstract::Candida albicans produces large amounts of the acyclic pentitol D-arabitol in culture and in infected animals and humans, and most strains also grow on minimal D-arabitol medium. An earlier study showed that the major metabolic precursor of D-arabitol in C. albicans was D-ribulose-5-PO4 from the pentose pathway, that ...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.177.11.2971-2976.1995
更新日期:1995-06-01 00:00:00
abstract::Cellular vanadium metabolism was studied in Saccharomyces cerevisiae by isolating and characterizing vanadate [VO4(3-), V(V)]-resistant mutants. Vanadate growth inhibition was reversed by the removal of the vanadate from the medium, and vanadate resistance was found to be a recessive trait. Vanadate-resistant mutants ...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.164.2.611-617.1985
更新日期:1985-11-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.175.11.3459-3467.1993
更新日期:1993-06-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.135.3.1149-1150.1978
更新日期:1978-09-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.181.19.5984-5992.1999
更新日期:1999-10-01 00:00:00
abstract::Besides producing thymine-requiring mutants (thy), trimethoprim (TMP) cured the mini-ColE1 replicon pML21 at an appreciable frequency. The cured Escherichia coli K-12 cells behaved like polA mutants by failing to support the stable maintenance of the ColE1 plasmid. The mini-F replicon pSC138, which was lacking all thr...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.150.2.755-761.1982
更新日期:1982-05-01 00:00:00
abstract::Sphingobium japonicum UT26 utilizes gamma-hexachlorocyclohexane (gamma-HCH) as its sole source of carbon and energy. In our previous studies, we cloned and characterized genes encoding enzymes for the conversion of gamma-HCH to beta-ketoadipate in UT26. In this study, we analyzed a mutant obtained by transposon mutage...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01883-06
更新日期:2007-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.187.14.4760-4766.2005
更新日期:2005-07-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.93.6.1897-1905.1967
更新日期:1967-06-01 00:00:00
abstract::Erwinia rhapontici is able to convert sucrose into isomaltulose (palatinose, 6-O-alpha-D-glucopyranosyl-D-fructose) and trehalulose (1-O-alpha-D-glucopyranosyl-D-fructose) by the activity of a sucrose isomerase. These sucrose isomers cannot be metabolized by plant cells and most other organisms and therefore are possi...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.183.8.2425-2430.2001
更新日期:2001-04-01 00:00:00
abstract::We present the complete genome sequence of Yersinia pestis KIM, the etiologic agent of bubonic and pneumonic plague. The strain KIM, biovar Mediaevalis, is associated with the second pandemic, including the Black Death. The 4.6-Mb genome encodes 4,198 open reading frames (ORFs). The origin, terminus, and most genes en...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.184.16.4601-4611.2002
更新日期:2002-08-01 00:00:00
abstract::Irradiated L cells infected with Rickettsia tsutsugamushi were studied under the electron microscope to define the morphological growth pattern of the organism. For 2 days after inoculation, no rickettsiae were found either extra- or intracellularly; after 2 days multiple rickettsiae appeared within the host cells wit...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.154.2.879-892.1983
更新日期:1983-05-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.178.4.1141-1145.1996
更新日期:1996-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.180.2.444-448.1998
更新日期:1998-01-01 00:00:00
abstract::A-factor (2-isocapryloyl-3R-hydroxymethyl-gamma-butyrolactone) is essential for the initiation of aerial mycelium formation in Streptomyces griseus. amfR is one of the genes which, when cloned on a low-copy-number plasmid, suppresses the aerial mycelium-negative phenotype of an A-factor-deficient mutant of S. griseus....
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.180.19.5085-5093.1998
更新日期:1998-10-01 00:00:00
abstract::The ultrastructure of seven Thiobacillus species was studied. The structure of their cell envelopes is similar, if not identical, to that found in other gram-negative bacteria. Obvious differences were noted in the middle layer of the cell envelope of the seven cultures. Polyhedral inclusion bodies were apparent in fo...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.101.2.618-627.1970
更新日期:1970-02-01 00:00:00
abstract::Five transposon Tn5 mutants of the procaryote Myxococcus xanthus had been shown previously to be defective in lipopolysaccharide biosynthesis (J. M. Fink,-M. Kalos, and J. F. Zissler, J. Bacteriol. 171:2033-2041, 1989). These mutants were studied for possible defects in gliding motility and multicellular development. ...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.171.4.2042-2048.1989
更新日期:1989-04-01 00:00:00
abstract::Open reading frame orf192, which is located immediately upstream of the aerobic repressor gene crtJ, was genetically and biochemically demonstrated to code for a second aerobic repressor (AerR) of photosynthesis gene expression in Rhodobacter capsulatus. Promoter-mapping studies indicate that crtJ has its own promoter...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/jb.184.10.2805-2814.2002
更新日期:2002-05-01 00:00:00
abstract::Mir M7 is a spontaneous morphologically conditional mutant of Klebsiella pneumoniae which grows as round cells (cocci) at pH 7 and as normal rods at pH 5.8. We studied the rates of peptidoglycan synthesis of cocci and rods growing at pH values of 7 and 5.8, respectively. It was found that exponentially growing cocci p...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.137.2.727-734.1979
更新日期:1979-02-01 00:00:00
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journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.180.21.5619-5625.1998
更新日期:1998-11-01 00:00:00
abstract::The decline in colony-forming ability observed during tryptophan starvation of Bacillus subtilis auxotrophs is a concentration-dependent phenomenon. It does not manifest itself when the initial cell concentration is 10(6) cells/ml or lower. This property has been used to test the killing activity of different fraction...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.101.2.355-360.1970
更新日期:1970-02-01 00:00:00
abstract::Using yeast two-hybrid screens, we have defined an interaction group of six Tra proteins encoded by the F plasmid and required by F(+) cells to elaborate F pili. The six proteins are TraH, TraF, TraW, TraU, TrbI, and TrbB. Except for TrbI, these proteins were all identified as hallmarks of F-like type IV secretion sys...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.186.16.5480-5485.2004
更新日期:2004-08-01 00:00:00
abstract::Antibody in hyperimmune rabbit antisera specific for Staphylococcus aureus teichoic acid was shown to be associated with the IgM fraction. Treatment of such sera with mercaptoethanol destroyed its activity in passive mouse protection tests, whereas absorption with antirabbit IgG had no effect. Antibody response in nor...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.96.5.1540-1545.1968
更新日期:1968-11-01 00:00:00
abstract::The type IV pili of plasmid R64 belonging to the type IVB group are required only for liquid mating. They consist of the major and minor components PilS pilin and PilV adhesin, respectively. PilS pilin is first synthesized as a 22-kDa prepilin from the pilS gene and is then processed to a 19-kDa mature pilin by PilU p...
journal_title:Journal of bacteriology
pub_type: 杂志文章
doi:10.1128/JB.01204-07
更新日期:2008-02-01 00:00:00