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Microbiology 143 (1997), 739-748; DOI  10.1099/00221287-143-3-739
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Pirellulosomes: a new type of membrane-bounded cell compartment in planctomycete bacteria of the genus Pirellula

Margaret R. Lindsay1, Richard I. Webb1,2 and John A. Fuerst1,*

1Department of Microbiology, University of Queensland, Brisbane, Queensland 4072, Australia
2Centre for Microscopy and Microanalysis, University of Queensland, Brisbane, Queensland 4072, Australia

ABSTRACT

A distinct type of cellular organization was found in two species of the planctomycete genus Pirellula, Pirellula marina and Pirellula staleyi. Both species possess two distinct regions within the cell which are separated by a single membrane. The major region of the cell, the pirellulosome, contains the fibrillar condensed nucleoid. The other area, the polar cap region, forms a continuous layer surrounding the entire pirellulosome and displays a cap of asymmetrically distributed material at one cell pole. Immuno- and cytochemical-labelling of P. marina demonstrated that DNA is located exclusively within the pirellulosome; cell RNA is concentrated in the pirellulosome, with some RNA also located in the polar cap region.

*Author for correspondence: John A. Fuerst. Tel: +61 7 3365 4643. Fax: +61 7 3365 4620. e-mail: fuerst@biosci.uq.edu.au

Keywords: bacterial ultrastructure, pirellulosomes, planctomycetes, cryosubstitution, nucleoids




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