Envelope ultrastructure of uncultured naturally occurring magnetotactic cocci.

Abstract:

:Magnetotactic bacteria are microorganisms that respond to magnetic fields. We studied the surface ultrastructure of uncultured magnetotactic cocci collected from a marine environment by transmission electron microscopy using freeze-fracture and freeze-etching. All bacteria revealed a Gram-negative cell wall. Many bacteria possessed extensive capsular material and a S-layer formed by particles arranged with hexagonal symmetry. No indication of a metal precipitation on the surface of these microorganisms was observed. Numerous membrane vesicles were observed on the surface of the bacteria. Flagella were organized in bundles originated in a depression on the surface of the cells. Occasionally, a close association of the flagella with the magnetosomes that remained attached to the replica was observed. Capsules and S-layers are common structures in magnetotactic cocci from natural sediments and may be involved in inhibition of metal precipitation on the cell surface or indirectly influence magnetotaxis.

journal_name

FEMS Microbiol Lett

authors

Freitas F,Keim CN,Kachar B,Farina M,Lins U

doi

10.1016/S0378-1097(02)01187-4

keywords:

subject

Has Abstract

pub_date

2003-02-14 00:00:00

pages

33-8

issue

1

eissn

0378-1097

issn

1574-6968

pii

S0378109702011874

journal_volume

219

pub_type

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