The Magnetotactic Bacteria

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There are (at least) Two Types of Magnetoaerotaxis... (Frankel et al., (1997) Biophys. J.) Axial Magnetoaerotaxis e.g., Magnetospirillum magnetotacticum Polar Magnetoaerotaxis e.g., Magnetococcus marinus strain MC-1
IMPORTANT FEATURES OF THE MAGNETOTACTIC BACTERIA They are diverse with regard to morphology and physiology: “Magnetotactic Bacteria” has no taxonomic meaning • All known are Gram-negative members of the Domain Bacteria and belong phylogenetically to various subgroups of the Proteobacteria, the Nitrospirae phylum and now the candidate division OP3 of the PVC “superphylum” (monophyletic clade consisting of OP3 together with the candidate division Poribacteria and the Planctomycetes, Verrucomicrobia, Chlamydiae and Lentisphaerae) • All known are motile by means of flagella • All display a negative tactic and/or growth response to atmospheric levels of O 2 (~21% O 2 ); they are all anaerobes or microaerophiles or both • They all have a respiratory form of metabolism; only one is known to be capable of fermentation (pyruvate to acetate and H 2 ) • They have great potential in the biogeochemical cycling of several key elements in natural environments (N, S, C and Fe etc.) • They are ubiquitous in aquatic habitats and cosmopolitan in distribution. Locally confined to or slightly below the oxic-anoxic interface.
Page 1 and 2: Small Magnetism, Big Attraction: Th
Page 3: Some History The magnetotactic bact
Page 7 and 8: Magnetosomes Note consistent specie
Page 9 and 10: Magnetosome Crystal Magnetosome cry
Page 11 and 12: Magnetotactic Bacteria Generally Ar
Page 13 and 14: So Magnetosomes are Clearly a Maste
Page 15 and 16: South-seeking Magnetotactic Bacteri
Page 17 and 18: Genes and Proteins Involved in Cons
Page 19 and 20: Genes and Proteins Involved in Cons
Page 21 and 22: Role of Some of the Magnetosome Pro
Page 23 and 24: Other Magnetosome Proteins… MamB,
Page 25 and 26: Organization of the Magnetosome Gen
Page 27 and 28: Magnetosome Gene Island (MAI) in Ma
Page 29 and 30: With Chris Came Some New Ideas…
Page 31 and 32: What did we expect to find? But mag
Page 33 and 34: New Magnetotactic Bacteria of the N
Page 35 and 36: Strain LO-1 (cont.)
Page 37 and 38: Strain HSMV-1 (cont.)
Page 39 and 40: New Magnetotactic Bacteria of the P
Page 45 and 46: Magnetosomes of Strains BW-2 & SS-5
Page 47 and 48: Phylogeny of Strains BW-2 and SS-5
Page 49 and 50: Fe 3 O 4 and Fe 3 S 4 in the Same B
Page 51 and 52: Greigite-producing Rods Phylogeny T
Page 53 and 54: Strain BW-1 We are currently sequen
Page 55 and 56:
Origin of Magnetotaxis and Magnetos
Page 57 and 58:
Acknowledgements Postdocs Denis Tru
Page 59:
Fe 3 O 4 particles are promiscuous!
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The Magnetotactic Bacteria

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