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The Dream of a Mycobacterium

MyBook is a cheap paperback edition of the original book and will be sold at uniform, low price.
  • Authors: Catherine Baranowski1, E. Hesper Rego2, Eric J. Rubin3,4
  • Editors: Vincent A. Fischetti5, Richard P. Novick6, Joseph J. Ferretti7, Daniel A. Portnoy8, Julian I. Rood9
    Affiliations: 1: Department of Immunology and Infectious Disease, Harvard T. H. Chan School of Public Health, Boston, MA 02115; 2: Department of Microbial Pathogenesis, Yale University School of Medicine, New Haven, CT 06510; 3: Department of Immunology and Infectious Disease, Harvard T. H. Chan School of Public Health, Boston, MA 02115; 4: Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115; 5: The Rockefeller University, New York, NY; 6: Skirball Institute for Molecular Medicine, NYU Medical Center, New York, NY; 7: Department of Microbiology & Immunology, University of Oklahoma Health Science Center, Oklahoma City, OK; 8: Department of Molecular and Cellular Microbiology, University of California, Berkeley, Berkeley, CA; 9: Australian Bacterial Pathogen Program, Department of Microbiology, Monash University, Melbourne, Australia
  • Source: microbiolspec April 2019 vol. 7 no. 2 doi:10.1128/microbiolspec.GPP3-0008-2018
  • Received 21 May 2018 Accepted 25 May 2018 Published 26 April 2019
  • Eric J. Rubin, [email protected]
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  • Abstract:

    How do mycobacteria divide? Cell division has been studied extensively in the model rod-shaped bacteria and , but much less is understood about cell division in mycobacteria, a genus that includes the major human pathogens and . In general, bacterial cell division requires the concerted effort of many proteins in both space and time to elongate the cell, replicate and segregate the chromosome, and construct and destruct the septum - processes which result in the creation of two new daughter cells. Here, we describe these distinct stages of cell division in and follow with the current knowledge in mycobacteria. As will become apparent, there are many differences between mycobacteria and in terms of both the broad outline of cell division and the molecular details. So, while the fundamental challenge of spatially and temporally organizing cell division is shared between these rod-shaped bacteria, they have solved these challenges in often vastly different ways.

  • Citation: Baranowski C, Rego E, Rubin E. 2019. The Dream of a Mycobacterium. Microbiol Spectrum 7(2):GPP3-0008-2018. doi:10.1128/microbiolspec.GPP3-0008-2018.


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How do mycobacteria divide? Cell division has been studied extensively in the model rod-shaped bacteria and , but much less is understood about cell division in mycobacteria, a genus that includes the major human pathogens and . In general, bacterial cell division requires the concerted effort of many proteins in both space and time to elongate the cell, replicate and segregate the chromosome, and construct and destruct the septum - processes which result in the creation of two new daughter cells. Here, we describe these distinct stages of cell division in and follow with the current knowledge in mycobacteria. As will become apparent, there are many differences between mycobacteria and in terms of both the broad outline of cell division and the molecular details. So, while the fundamental challenge of spatially and temporally organizing cell division is shared between these rod-shaped bacteria, they have solved these challenges in often vastly different ways.

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Image of FIGURE 1

Characteristics of growth and division in and mycobacteria. and grow by adding new cell wall (gray) along the lateral cell body. Mycobacteria grow only at the polar regions, and do so at unequal amounts depending on the identity of the pole. This is observed by using a cell wall dye (green) to stain the existing cell wall and observe outgrowth of the newly synthesized, unstained cell wall ( 7 ). Arrows, polar location of new cell wall synthesis (a large arrow indicates more growth); dotted line, septum; green portion, old cell wall; gray portion, new cell wall.

Source: microbiolspec April 2019 vol. 7 no. 2 doi:10.1128/microbiolspec.GPP3-0008-2018
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Image of FIGURE 2

Polar growth segregates the cell wall based on age. (Top) Fluorescent -amino acids are thought to incorporate into nascent PG. Pulse chase with these shows how the new and old cell walls are spatially segregated in (Baranowski C, Rego EH, and Rubin EJ, unpublished images). (Bottom) Alexa-488 NHS ester stains the existing cell wall (green). New cell wall is unstained and can be monitored using time-lapse microscopy. After two divisions, the oldest cell wall is inherited by the new pole daughter cells (*) in . (Baranowski, Rego, and Rubin. unpublished images; 7 ).

Source: microbiolspec April 2019 vol. 7 no. 2 doi:10.1128/microbiolspec.GPP3-0008-2018
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Image of FIGURE 3

Mycobacterial divisome interactions. A schematic of mycobacterial divisome protein interactions. Note that interactions are not necessarily direct given the available data. Gray dotted lines, physical interactions; red dotted lines, negative regulation; brown lines, FtsQ pulldown proteins ( 44 ); blue text, cell wall enzymes; orange text, kinases.

Source: microbiolspec April 2019 vol. 7 no. 2 doi:10.1128/microbiolspec.GPP3-0008-2018
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Image of FIGURE 4

Mycobacterial divisome and elongasome members. (Top) Schematic of proteins involved in mycobacterial cell division. Proteins marked with an asterisk (*) have been shown to interact with FtsZ. The FtsZ ring is illustrated as a dark gray circle upon which the divisome members are arranged. (Bottom) Schematic of proteins involved in mycobacterial elongation. Interacting proteins are depicted touching, and proteins with a question mark (?) may belong in these complexes, but data are limited.

Source: microbiolspec April 2019 vol. 7 no. 2 doi:10.1128/microbiolspec.GPP3-0008-2018
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