title: Natural IS711 insertion causing omp31 gene inactivation in Brucella ovis.
abstract: The present report describes an atypical Brucella ovis strain (Bo10) isolated from the epididymis and testis of an infected ram. Macroscopic and microscopic lesions characteristic for the infection, including positive Brucella immunostaining, were observed within lesions in the genital organs. Compared to other isolates, strain Bo10 required an additional day (a total of 96 hr) of incubation to form visible colonies, showed a distinct carbon source utilization profile, agglutinated only weakly with rough (R) serum, but showed a high capacity for autoagglutination. Isolate Bo10 failed to produce the 1,071-bp fragment in the outer membrane protein (omp) 31 gene-based part of the "Bruce-ladder" multiplex polymerase chain reaction system but did produce a 1,915-bp amplicon, thus presenting a profile similar to Brucella abortus. Sequence analysis of the 1,915-bp fragment revealed an 842-bp long insertion sequence (IS)711 transposon element inserted into the promoter region of the omp31 gene, immediately upstream from the ribosome binding site (-10 box/Pribnow box). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of a whole-cell lysate showed the absence in Bo10 of the approximately 31-kDa protein fragment associated with omp31. The results demonstrate a natural inactivation of omp31 and, consequently, the absence of the Omp31 protein in this B. ovis isolate. The novel location of IS711 within the genome of a naturally occurring B. ovis strain supports the hypothesis that IS711 could be an active transposon in this Brucella species.
authors: Institute for Veterinary Medical Research, Hungarian Academy of Sciences, Budapest, Hungary. m.gyuranecz@gmail.com
authors: Miklós
authors: M
authors: Gyuranecz
authors: Zsuzsa
authors: Z
authors: Kreizinger
authors: Gábor
authors: G
authors: Horváth
authors: Zsuzsanna
authors: Z
authors: Rónai
authors: Adám
authors: A
authors: Dán
authors: Beáta
authors: B
authors: Nagy
authors: Levente
authors: L
authors: Szeredi
authors: László
authors: L
authors: Makrai
authors: Szilárd
authors: S
authors: Jánosi
authors: István
authors: I
authors: Hajtós
authors: Tibor
authors: T
authors: Magyar
authors: Mangesh
authors: M
authors: Bhide
authors: Károly
authors: K
authors: Erdélyi
authors: Béla
authors: B
authors: Dénes
mesh_terms: D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D042061:Brucella ovis / Q000235:genetics / Q000378:metabolism*; D002006:Brucellosis / Q000382:microbiology / Q000662:veterinary*; D004823:Epididymitis / Q000382:microbiology / Q000662:veterinary*; D015964:Gene Expression Regulation, Bacterial; D008297:Male; D016254:Mutagenesis, Insertional; D009154:Mutation; D012756:Sheep; D012757:Sheep Diseases / Q000382:microbiology*
chemical_list: D001425:Bacterial Outer Membrane Proteins