Archives of Microbiology

, Volume 184, Issue 5, pp 259–270

The three-dimensional structure of the cyanobacterium Synechocystis sp. PCC 6803

  • Allison M.L. van de Meene
  • Martin F. Hohmann-Marriott
  • Wim F.J. Vermaas
  • Robert W. Roberson
Original Paper

Abstract

To advance our knowledge of the model cyanobacterium Synechocystis sp. PCC 6803 we investigated the three-dimensional organization of the cytoplasm using standard transmission electron microscopy and electron tomography. Electron tomography allows a resolution of ~5 nm in all three dimensions, superior to the resolution of most traditional electron microscopy, which is often limited in part by the thickness of the section (70 nm). The thylakoid membrane pairs formed layered sheets that followed the periphery of the cell and converged at various sites near the cytoplasmic membrane. At some of these sites, the margins of thylakoid membranes associated closely along the external surface of rod-like structures termed thylakoid centers, which sometimes traversed nearly the entire periphery of the cell. The thylakoid membranes surrounded the central cytoplasm that contained inclusions such as ribosomes and carboxysomes. Lipid bodies were dispersed throughout the peripheral cytoplasm and often juxtaposed with cytoplasmic and thylakoid membranes suggesting involvement in thylakoid maintenance or biogenesis. Ribosomes were numerous and mainly located throughout the central cytoplasm with some associated with thylakoid and cytoplasmic membranes. Some ribosomes were attached along internal unit-membrane-like sheets located in the central cytoplasm and appeared to be continuous with existing thylakoid membranes. These results present a detailed analysis of the structure of Synechocystis sp. PCC 6803 using high-resolution bioimaging techniques and will allow future evaluation and comparison with gene-deletion mutants.

Keywords

Electron tomography Field-emission cryo-scanning electron microscopy Serial section reconstruction Transmission electron microscopy Thylakoid membrane biogenesis Cyanobacteria 

Abbreviations

HVEM

High voltage electron microscopy

IVEM

Intermediate voltage electron microscope

3-D

Three-dimensional

FESEM

Field-emission scanning electron microscopy

TEM

Transmission electron microscopy

Supplementary material

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Allison M.L. van de Meene
    • 1
  • Martin F. Hohmann-Marriott
    • 1
  • Wim F.J. Vermaas
    • 1
  • Robert W. Roberson
    • 1
  1. 1.School of Life SciencesArizona State UniversityTempeUSA

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