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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Comparative analyses of two cryptic plasmids from Haemophilus somnus (Histophilus somni).

Haemophilus somnus is an opportunistic bacterial pathogen capable of causing pneumonia, septicemia, and other systemic infections in bovines. An H. somnus isolate from bovine abortion (strain 649) was found to carry a approximately 1.3kb plasmid (pHS649) that contained partial homology to two previously sequenced Haemophilus/Histophilus plasmids by BLAST analyses. Sequence analysis of pHS649 identified a putative RepA protein with 48% similarity to the RepA protein of Escherichia coli plasmid pKL1. A approximately 5kb plasmid (pHS129) from H. somnus preputial isolate 129Pt was also sequenced and found to encode two copies of a putative RepB protein. Whereas pHS649 stably replicated in E. coli DH5alpha, pHS129 did not. Genetic relatedness and possible replication mechanisms of these plasmids are described.[1]


  1. Comparative analyses of two cryptic plasmids from Haemophilus somnus (Histophilus somni). Siddaramappa, S., Duncan, A.J., Brettin, T., Inzana, T.J. Plasmid (2006) [Pubmed]
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