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The enteric, anaerobic spirochete Brachyspira hyodysenteriae is the causative agent of swine dysentery, a severe mucohemorrhagic diarrheal disease of pigs that has economic significance in every major pork-producing country. Recent investigation into potential vaccine candidates has focused on the outer membrane proteins of B. hyodysenteriae. Bhmp39 (formerly Vsp39) is the most abundant surface-exposed outer membrane protein of B. hyodysenteriae; its predicted gene sequence has previously been shown to share sequence similarity to eight genes divided evenly between two paralogous loci. The peptide sequence suggested that Bhmp39 is encoded by one of these genes, bhmp39h. The biological significance of maintaining eight homologous bhmp39 genes is unclear, though it has been proposed that this may play a role in antigenic variation. In this study, real-time, reverse transcription-PCR was used to demonstrate that bhmp39f and bhmp39h were the transcripts most abundantly expressed by B. hyodysenteriae strain B204 cultured under in vitro growth conditions. Mass spectrometry data of the purified 39-kDa membrane protein showed that both Bhmp39f and Bhmp39h were present. Northern blot analysis across predicted Rho-independent terminators demonstrated that the genes of the bhmp39efgh locus result in monocistronic transcripts.

Differential Expression of the Bhmp39 Major Outer Membrane Proteins of Brachyspira hyodysenteriae