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Screening of a Fosmid Library of Marine Environmental Genomic DNA Fragments Reveals Four Clones Related to Members of the OrderPlanctomycetales

ABSTRACT A fosmid library with inserts containing approximately 40 kb of marine bacterial DNA (J. L. Stein, T. L. Marsh, K. Y. Wu, H. Shizuya, and E. F. DeLong, J. Bacteriol. 178:591–599, 1996) yielded four clones with 16S rRNA genes from the orderPlanctomycetales. Three of the clones belong to thePirellula group and one clone belongs to thePlanctomyces group, based on phylogenetic and signature nucleotide analyses of full-length 16S rRNA genes. Sequence analysis of the ends of the genes revealed a consistent mismatch in a widely used bacterium-specific 16S rRNA PCR amplification priming site (27F), which has also been reported in some thermophiles and spirochetes.