Bipolar Localization of a Chromosome Partition Protein in Bacillus Subtilis

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1997 Apr 29

PMID 9114058

Citations 92

Authors

D C Lin

P A Levin

A D Grossman

Affiliations

Soon will be listed here.

Abstract

We have determined the subcellular localization of the chromosome partition protein Spo0J of Bacillus subtilis by immunofluorescence microscopy and visualizing fluorescence of a Spo0J-GFP fusion protein. Spo0J was associated with a region of the nucleoid proximal to the cell pole, both in growing cells dividing symmetrically and in sporulating cells dividing asymmetrically. Additional experiments indicated that Spo0J was bound to sites in the origin-proximal third of the chromosome. These results show that the replicating chromosomes are oriented in a specific manner during the division cycle, with the Spo0J binding region positioned toward the cell poles. Experiments characterizing cells at different stages of the cell cycle showed that chromosome orientation is established prior to the initiation of cell division. Our results indicate that there is a mechanism for orienting the chromosomes and that the chromosome partition protein Spo0J might be part of a bacterial mitotic-like apparatus.

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