Antibody response to Brucella ovis outer membrane proteins in ovine brucellosis

Hot saline extracts of Brucella ovis were composed of vesicles with outer membrane proteins (OMPs), lipopolysaccharide, and phospholipid as constituents. Extraction with petroleum ether-chloroform-phenol yielded a protein fraction free of detectable lipopolysaccharide, in which group 3 OMPs (28,500...

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Authors: Riezu-Boj, J.I. (José Ignacio)|||/items/87349e89-7360-4cdd-81be-2e8a6174b5f6; Moriyon, I. (Ignacio)|||/items/834b4ce9-a879-4ba7-8884-39d0ddd88c7b; Blasco, J.M. (J. M.)|||/items/63aa30f3-7ffa-4d2e-8dbd-d070fd4e4efa; Gamazo-de la Rasilla, C.M. (Carlos Manuel)|||/items/d6019c54-7915-4611-94c1-b772366dab1d; Diaz, R. (Ramón)|||/items/5326d716-1718-4b1a-adf2-64bb72a0861c
Format: Article
Publication date:1990
Country:España
Institution:Universidad de Navarra
Repository:Dadun. Depósito Académico Digital de la Universidad de Navarra
Language:English
OAI Identifier:oai:dadun.unav.edu:10171/23049
Online Access:https://hdl.handle.net/10171/23049
Access Level:Open access
Keyword:Antibodies, bacterial/analysis
Bacterial outer membrane proteins/immunology
Brucella/immunology
Brucellosis/veterinary
Sheep diseases/immunology
Summary:Hot saline extracts of Brucella ovis were composed of vesicles with outer membrane proteins (OMPs), lipopolysaccharide, and phospholipid as constituents. Extraction with petroleum ether-chloroform-phenol yielded a protein fraction free of detectable lipopolysaccharide, in which group 3 OMPs (28,500 apparent molecular weight [28.5K], 27.0K, and 25.5K) represented 81% of the total. Group 1 OMPs and 67.0K, 22.5K to 21.5K, and 19.5K to 18.0K proteins were also detected. Adsorption of immune sera with whole bacteria suggested that group 3 OMPs and 67.0K, 22.5K to 21.5K, and 19.5K to 18.0K proteins had antigenic determinants exposed on the surfaces of both B. ovis and rough B. melitensis cells but not on smooth B. melitensis cells. Antibodies to group 3 OMPs and the 67.0K protein in the sera of 93 and 87%, respectively, of B. ovis-infected rams were found by immunoblotting. Antibodies to other proteins were present in 67% of these animals. Compared with B. ovis-infected rams which had not developed lesions, rams with epididymo-orchitis had antibodies to a larger variety of proteins. Although ewes infected with B. melitensis also showed antibodies to OMPs, the immunoblot reactions were less intense.

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