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Polyacrylamide gel electrophoresis of whole-cell preparations of Rhodococcus equi.

The whole-cell proteins of ten strains of Rhodococcus equi isolated from horses, pigs, or humans, including the type strain ATCC 6939, were examined by sodium dodecyl sulphate-polyacrylamide gel electrophoresis. The protein profiles of seven different capsular serotypes and the type strain were very similar when bacteria were cultured under the same conditions. Protein profiles were largely unaffected by incubation at two temperatures (30 degrees C, 37 degrees C) or times (12 h, 48 h). There were generally minor differences in protein profiles between strains grown in different media (brain heart infusion, nutrient, minca broths, tryptic soy-blood agar) with the marked exception of a prominent diffuse 17.5 kd protein which was expressed in nutrient broth. This protein was not produced by the type strain and was lost on repeated passage in vitro (50th, 100th passage) in two of three other strains examined.