Toward cloning of the magnetotactic metagenome: identification of magnetosome island gene clusters in uncultivated magnetotactic bacteria from different aquatic sediments.
In this report, we describe the selective cloning of large DNA fragments from magnetotactic metagenomes from various aquatic habitats. This was achieved by a two-step magnetic enrichment which allowed the mass collection of environmental magnetotactic bacteria (MTB) virtually free of nonmagnetic contaminants. Four fosmid libraries were constructed and screened by end sequencing and hybridization analysis using heterologous magnetosome gene probes. A total of 14 fosmids were fully sequenced. We identified and characterized two fosmids, most likely originating from two different alphaproteobacterial strains of MTB that contain several putative operons with homology to the magnetosome island (MAI) of cultivated MTB. This is the first evidence that uncultivated MTB exhibit similar yet differing organizations of the MAI, which may account for the diversity in biomineralization and magnetotaxis observed in MTB from various environments.
Jogler
Christian
C
LMU Department Biology I, Planegg-Martinsried, Germany.
Lin
Wei
W
Meyerdierks
Anke
A
Kube
Michael
M
Katzmann
Emanuel
E
Flies
Christine
C
Pan
Yongxin
Y
Amann
Rudolf
R
Reinhardt
Richard
R
Schüler
Dirk
D
D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification*; D023061:Gene Order; D005798:Genes, Bacterial; D044404:Genomic Islands; D008969:Molecular Sequence Data; D005810:Multigene Family; D015388:Organelles / Q000235:genetics*; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D014871:Water Microbiology
D004269:DNA, Bacterial