Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles: DFG German National Licenses  (27)
Source
  • Articles: DFG German National Licenses  (27)
Material
Years
  • 1
    Electronic Resource
    Electronic Resource
    MOLECULAR GENETICS OF SPORULATION IN BACILLUS SUBTILIS (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 30 (1996), S. 297-341 
    Details
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The process of sporulation in the bacterium Bacillus subtilis proceeds through a well-defined series of morphological stages that involve the conversion of a growing cell into a two-cell-chamber sporangium within which a spore is produced. Over 125 genes are involved in this process, the transcription of which is temporally and spatially controlled by four DNA-binding proteins and five RNA polymerase sigma factors. Through a combination of genetic, biochemical, and cell biological approaches, regulatory networks have been elucidated that explicitly link the activation of these sigma factors to landmark events in the course of morphogenesis and to each other through pathways of intercellular communication. Signals targeting proteins to specific subcellular localizations and governing the assembly of macromolecular structures have been uncovered but their nature remains to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.genet.30.1.297
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An investigation into the compartmentalization of the sporulation transcription factor σE in Bacillus subtilis (2002)
    Oxford, UK : Blackwell Science Ltd.
    Molecular microbiology 43 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Sporulation in Bacillus subtilis involves the formation of a polar septum, which divides the sporangium into a mother cell and a forespore. The σE factor, which is encoded within the spoIIG operon, is a cell-specific regulatory protein that directs gene transcription in the mother cell. σE is synthesized as an inactive proprotein pro-σE, which is converted to the mature factor by the putative processing enzyme SpoIIGA. Processing of pro-σE does not commence until after asymmetric division when σE is largely confined to the mother cell. Processing depends on the signalling protein SpoIIR, which delays proteolysis until after polar septation, but the mechanism by which σE is confined to the mother cell is not understood. Previous work favoured a model in which pro-σE localizes to the mother cell face of the polar septum, such that σE would be selectively released into mother cell cytoplasm. Based on the use of green fluorescent protein (GFP) fusions, we now report that pro-σE is distributed approximately uniformly along all membrane surfaces and is not confined to the mother- cell face of the septum. Rather, our results are consistent with a model in which preferential and persistent transcription of the spoIIG operon in the mother cell and degradation of σE in the forespore contribute to the selective accumulation of σE in the mother cell. Persistent transcription of spoIIG after polar septation also contributes to the proper timing of pro-σE processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.02732.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A three-protein inhibitor of polar septation during sporulation in Bacillus subtilis (2001)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 42 (2001), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We present evidence for a three-protein inhibitor of polar division that locks in asymmetry after the formation of a polar septum during sporulation in Bacillus subtilis. Asymmetric division involves the formation of cytokinetic Z-rings near both poles of the developing cell. Next, a septum is formed at one of the two polar Z-rings, thereby generating a small, forespore cell and a mother cell. Gene expression under the control of the mother-cell transcription factor σE is needed to block cytokinesis at the pole distal to the newly formed septum. We report that this block in polar cytokinesis is mediated partly by σE-directed transcription of spoIID, spoIIM and spoIIP, sporulation genes that were known to be involved in the subsequent process of forespore engulfment. We find that a spoIID, spoIIM and spoIIP triple mutant substantially mimicked the bipolar division phenotype of a σE mutant and that cells engineered to produce SpoIID, SpoIIM and SpoIIP prematurely were inhibited in septum formation at both poles. Consistent with the hypothesis that SpoIID, SpoIIM and SpoIIP function at both poles of the sporangium, a GFP–SpoIIM fusion localized to the membrane that surrounds the engulfed forespore and to the potential division site at the distal pole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2001.02660.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Localization of the sporulation protein SpoIIE in Bacillus subtilis is dependent upon the cell division protein FtsZ (1997)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 25 (1997), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: SpoIIE is an integral membrane protein that governs the establishment of cell-specific gene transcription during the process of sporulation in Bacillus subtilis. Synthesis of SpoIIE commences shortly after the onset of sporulation, after which the protein localizes at sites of potential cell division near both ends of the sporangium. We now show that, within the limits of resolution of immunofluorescence microscopy, this bipolar pattern of localization observed in early-sporulating cells was superimposable with the bipolar pattern of localization of the cell division protein FtsZ. The localization of SpoIIE was dependent upon FtsZ because little or no localization was observed along the length of filaments that were generated by depleting sporulating cells for the cell division protein. In contrast, SpoIIE and FtsZ were found to co-localize at regularly spaced intervals in filaments generated by the use of a temperature-sensitive mutant of the cell division gene divIC. Finally, in cells engineered to synthesize SpoIIE during growth, SpoIIE localized at the mid-cell position, coincident with the position of FtsZ, which exhibits a medial pattern of localization in cells undergoing binary fission. These results suggest that the bipolar pattern of localization of SpoIIE is dictated by the sporulation-induced switch in the position of FtsZ or of other, FtsZ-associated, cell division proteins. Thus, it appears that B. subtilis has co-opted the cell division machinery as a means of localizing a cell fate determinant to the polar septum during sporulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1997.mmi505.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Characterization of a novel regulatory gene governing the expression of a polyketide synthase gene in Streptomyces ambofaciens (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 6 (1992), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A key step in the biosynthesis of macrolide antibiotics is the assembly of a large macrocyclic lactone ring by a multienzyme protein complex called the polyketide synthase. In the species Streptomyces ambofaciens, the polyketide synthase for the assembly of the 16-membered ring of the macrolide antibiotic spiramycin is encoded by the biosynthetic gene srmG. Here we show that the accumulation of transcripts from the srmG promoter is governed by the regulatory gene srmR, whose predicted product, a 65 kDa polypeptide, is not significantly similar in its deduced amino acid sequence to that of previously reported proteins in the protein databases. The srmR gene product is also required for the accumulation of transcripts from srmX, an additional gene in the vicinity of srmR, but not for the accumulation of transcripts from srmR itself. Interestingly, mutations in srmR prevent the accumulation of transcripts from the spiramycin resistance gene srmB, but this is an indirect consequence of the failure of srmR mutants to produce spiramycin, which is an inducer of its own resistance gene. The possibility that srmR is the prototype for a new class of regulatory genes governing early events in the biosynthesis of macrolide antibiotics is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb01374.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Use of time-lapse microscopy to visualize rapid movement of the replication origin region of the chromosome during the cell cycle in Bacillus subtilis (1998)
    Oxford BSL : Blackwell Publishing Ltd
    Molecular microbiology 28 (1998), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We describe the use of time-lapse fluorescence microscopy to visualize the movement of the DNA replication origin and terminus regions on the Bacillus subtilis chromosome during the course of the cell cycle. The origin and terminus regions were tagged with a cassette of tandem lac operator repeats and visualized through the use of a fusion of the green fluorescent protein to the LacI repressor. We have discovered that origin regions abruptly move apart towards the cell poles during a brief interval of the cell cycle. This movement was also seen in the absence of cell wall growth and in the absence of the product of the parB homologue spo0J. The origin regions moved apart an average distance of 1.4 μm in an 11 min period of abrupt movement, representing an average velocity of 0.17 μm min−1. and reaching a maximum velocity of greater than 0.27 μm min−1. The terminus region also exhibited a striking pattern of movement but not as far or a rapid as the origin region. These results provide evidence for a mitotic-like motor that is responsible for segregation of the origin regions of the chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1998.00808.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Localization of the Escherichia coli cell division protein FtsI (PBP3) to the division site and cell pole (1997)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 25 (1997), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: FtsI, also known as penicillin-binding protein 3, is a transpeptidase required for the synthesis of peptidoglycan in the division septum of the bacterium, Escherichia coli. FtsI has been estimated to be present at about 100 molecules per cell, well below the detection limit of immunoelectron microscopy. Here, we confirm the low abundance of FtsI and use immunofluorescence microscopy, a highly sensitive technique, to show that FtsI is localized to the division site during the later stages of cell growth. FtsI was also sometimes observed at the cell pole; polar localization was not anticipated and its significance is not known. We conclude (i) that immunofluorescence microscopy can be used to localize proteins whose abundance is as low as approximately 100 molecules per cell; and (ii) that spatial and temporal regulation of FtsI activity in septum formation is achieved, at least in part, by timed localization of the protein to the division site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1997.5041869.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Visualization of the subcellular location of sporulation proteins in Bacillus subtilis using immunofluorescence microscopy (1995)
    Osney Mead, Oxford OX2 0EL, UK : Blackwell Science Ltd
    Molecular microbiology 18 (1995), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We describe the application of immunofluorescence microscopy to visualization of the subcellular localization of proteins involved in coat morphogenesis and chromosome packaging during the process of sporulation in Bacillus subtilis. In confirmation and extension of previous findings, we show that SpolVA, which is responsible for guiding coat formation to the surface of the outer membrane that surrounds the developing spore, assembles into a shell that is located close to or on the surface of this enveloping membrane. CotE, which is responsible for the formation of the outer layer of the coat, assembles into a second shell of apparently larger diameter. Assembly of SpolVA could be detected as early as the morphological stage of polar septation and closely followed the enveloping membrane of the mother cell during the stage of engulfment, thereby providing a sensitive and diagnostic marker for this phagocytic-like process. Surprisingly, the chromosome of the developing spore and the small, acid-soluble proteins, known as α/β-type SASPs, that are known to coat the spore chromosome, were found to co-localize to a doughnut-like ring of approximately 1 µm in diameter. The use of a double mutant lacking the α/β-type SASP demonstrated that these high abundance, DNA-binding proteins are responsible for packaging the chromosome of the developing spore into this unusual structure. We conclude that sporulation in B. subtilis is a fertile system for addressing cell biological problems in a bacterium and that immunofluorescence microscopy provides a sensitive method for visualizing protein subcellular localization at high resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1995.mmi_18030459.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    An unusually small gene required for sporulation by Bacillus subtilis (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 9 (1993), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We report the cloning and characterization of an unusually small gene called spoVM whose product Is required for normal formation of the cortex and coat during sporulation in Bacillus subtilis. The spoVM gene is adjacent to, and in convergent orientation with, the B. subtilis homologue to the Escherichia coli gene for ribosomal protein L28. The spoVM open reading frame is only 26 codons in length and is capable of encoding a polypeptide of 3 kDa. The short length of spoVM was verified by means of complementation experiments with wild-type and deletion-mutated copies of the open reading frame and by engineering the synthesis of the spoVM gene product in E. coli. Transcription of spoVM was induced during the second hour of sporulation (approximately stage II) by the appearance of the sporulation RNA poly-merase sigma factor, σ;E. Efficient transcription of spoVM additionally required the action of the sporulation DNA-binding protein SpolllD. Because spoVM was not strongly required for the transcription of several genes expressed at late times in development, its protein product is likely to play a morphogenetic rather than a regulatory role in sporulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1993.tb01736.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Growth and viability of Streptomyces coelicolor mutant for the cell division gene ftsZ (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 14 (1994), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A homologue of the bacterial cell division gene ftsZ was cloned from the filamentous bacterium Streptomyces coelicolor. The gene was located on the physical map of the chromosome at about ‘11 o'clock’ (in the vicinity of glkA, hisA and trpB). Surprisingly, a null mutant in which the 399-codon ftsZ open reading frame was largely deleted was viable, even though the mutant was blocked in septum formation. This indicates that cell division may not be essential for the growth and viability of S. coelicolor. The ftsZ mutant was able to produce aerial hyphae but was unable to produce spores, a finding consistent with the idea that ftsZ is required in order for aerial hyphae to undergo septation into the uninucleoid cells that differentiate into spores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1994.tb01285.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...