A dynamic bacterial cytoskeleton

Carballido-López, Rut; Errington, Jeff

doi:10.1016/j.tcb.2003.09.005

Cited by 112 publications

(82 citation statements)

References 45 publications

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“…While we are currently undertaking work on a pyrenoid proteome and also investigating the relationship between rubisco structure and function in the chloroplast pyrenoid, our closest guess to the normal pyrenoid structure is some type of aggregation mechanism associated with rubisco, which may be related either to rubisco holoenzyme amino acid residue interactions or some additional plastoskeleton structures. There is evidence for the existence of complex filamentous networks in bacteria (Carballido-Ló pez & Errington 2003), which could have a counterpart in the endosymbiotically inherited plastids or during cell division. At any event, solving the riddle of the pyrenoid structure and operation for installation in C3 plants may provide a more tractable alternative to the introduction of C4 biochemistry into certain crop species.…”

Section: Discussionmentioning

confidence: 99%

To concentrate or ventilate? Carbon acquisition, isotope discrimination and physiological ecology of early land plant life forms

Meyer

Seibt

Griffiths

2008

Phil. Trans. R. Soc. B

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A comparative study has been made of the photosynthetic physiological ecology and carbon isotope discrimination characteristics for modern-day bryophytes and closely related algal groups. Firstly, the extent of bryophyte distribution and diversification as compared with more advanced land plant groups is considered. Secondly, measurements of instantaneous carbon isotope discrimination (D), photosynthetic CO 2 assimilation and electron transport rates were compared during the drying cycles. The extent of surface diffusion limitation (when wetted), internal conductance and water use efficiency (WUE) at optimal tissue water content (TWC) were derived for liverworts and a hornwort from contrasting habitats and with differing degrees of thallus ventilation (as intra-thalline cavities and internal airspaces). We also explore how the operation of a biophysical carbon-concentrating mechanism (CCM) tempers isotope discrimination characteristics in two other hornworts, as well as the green algae Coleochaete orbicularis and Chlamydomonas reinhardtii. The magnitude of D was compared for each life form over a drying curve and used to derive the surface liquid-phase conductance (when wetted) and internal conductance (at optimal TWC). The magnitude of external and internal conductances, and WUE, was higher for ventilated, compared with non-ventilated, liverworts and hornworts, but the values were similar within each group, suggesting that both factors have been optimized for each life form. For the hornworts, leakiness of the CCM was highest for Megaceros vincentianus and C. orbicularis (approx. 30%) and, at 5%, lowest in C. reinhardtii grown under ambient CO 2 concentrations. Finally, evidence for the operation of a CCM in algae and hornworts is considered in terms of the probable role of the chloroplast pyrenoid, as the origins, structure and function of this enigmatic organelle are explored during the evolution of land plants.

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Section: Discussionmentioning

confidence: 99%

To concentrate or ventilate? Carbon acquisition, isotope discrimination and physiological ecology of early land plant life forms

Meyer

Seibt

Griffiths

2008

Phil. Trans. R. Soc. B

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“…Formation of the bacterial division septum is preceded by assembly of a multiprotein septasome complex that is visible as a ring extending around the cell cylinder at the division site (16,19). The septasome is required for invagination of the division septum and subsequent separation of the daughter cells.…”

Section: Ii)mentioning

confidence: 99%

Duplication and segregation of the actin (MreB) cytoskeleton during the prokaryotic cell cycle

Vats

Rothfield

2007

Proc. Natl. Acad. Sci. U.S.A.

111

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The bacterial actin homolog MreB exists as a single-copy helical cytoskeletal structure that extends between the two poles of rod-shaped bacteria. In this study, we show that equipartition of the MreB cytoskeleton into daughter cells is accomplished by division and segregation of the helical MreB array into two equivalent structures located in opposite halves of the predivisional cell. This process ensures that each daughter cell inherits one copy of the MreB cytoskeleton. The process is triggered by the membrane association of the FtsZ cell division protein. The cytoskeletal division and segregation events occur before and independently of cytokinesis and involve specialized MreB structures that appear to be intermediates in this process.septasome ͉ FtsZ ͉ cell division

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“…The striking observation that depletion or mutational inactivation of both actin homologues ParM and MreB result in a DNA segregation defect, raises the possibility that MreB filaments participate directly or indirectly in chromosome segregation. The discovery that MreB filaments in vivo are dynamic would satisfy a mechanism in which polymerization of MreB would actively move chromosomal DNA in opposite directions toward the cell poles (Carballido-Lopez & Errington 2003;Defeu Soufo & Graumann 2004). Alternatively, MreB filaments may serve as the tracks along which presently unidentified motor proteins move to drive chromosomal origin regions apart.…”

Section: A Link Between Dna Segregation and The Bacterial Cytoskeleton?mentioning

confidence: 99%

Towards understanding the molecular basis of bacterial DNA segregation

Leonard

Møller‐Jensen

Löwe

2005

Phil. Trans. R. Soc. B

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Bacteria ensure the fidelity of genetic inheritance by the coordinated control of chromosome segregation and cell division. Here, we review the molecules and mechanisms that govern the correct subcellular positioning and rapid separation of newly replicated chromosomes and plasmids towards the cell poles and, significantly, the emergence of mitotic-like machineries capable of segregating plasmid DNA. We further describe surprising similarities between proteins involved in DNA partitioning (ParA/ParB) and control of cell division (MinD/MinE), suggesting a mechanism for intracellular positioning common to the two processes. Finally, we discuss the role that the bacterial cytoskeleton plays in DNA partitioning and the missing link between prokaryotes and eukaryotes that is bacterial mechano-chemical motor proteins.

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A dynamic bacterial cytoskeleton

Cited by 112 publications

References 45 publications

To concentrate or ventilate? Carbon acquisition, isotope discrimination and physiological ecology of early land plant life forms

To concentrate or ventilate? Carbon acquisition, isotope discrimination and physiological ecology of early land plant life forms

Duplication and segregation of the actin (MreB) cytoskeleton during the prokaryotic cell cycle

Towards understanding the molecular basis of bacterial DNA segregation

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