Quantification of Mannheimia haemolytica leukotoxin by indirect ELISA.
Onderstepoort J Vet Res
; 73(4): 241-50, 2006 Dec.
Article
in En
| MEDLINE
| ID: mdl-17283723
ABSTRACT
An indirect enzyme-linked immunosorbent assay (ELISA) was developed for the quantification of extracellular leukotoxin (LKT) produced in chemostat culture of Mannheimia haemolytica in a serum-free culture medium. Leukotoxin purified with preparative SDS-PAGE was used for the production of chicken polyclonal antibodies (PAb) that served as the primary detecting antibody. Excising the LKT protein from an analytical SDS-PAGE gel proved an efficient technique for the purification of the toxin. Consequently, the 102 kDa LKT polypeptide purified in this manner served as reference toxin and the resulting calibration curve was modelled using a four parameter logistic fit to relate absorbance to LKT protein concentration. The lower detection limit corresponded to an LKT concentration of 14.5 ng ml(-1). The presence of SDS, serum albumin and the coating pH had a distinct effect on the absorbance values of the indirect ELISA.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Enzyme-Linked Immunosorbent Assay
/
Mannheimia haemolytica
/
Exotoxins
Type of study:
Diagnostic_studies
/
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Onderstepoort J Vet Res
Year:
2006
Document type:
Article
Affiliation country:
South Africa