1887

Abstract

Summary: Substrains of BCG (BCG) have been divided into two major groups, high and low producers, on the basis of the amount of secretion of the MPB70 protein. The antigen is produced in high concentration by BCG Tokyo, Moreau, Russia and Sweden (high-producer substrains), whereas in BCG Pasteur, Copenhagen and Tice (low-producer substrains) it is detected at 1 % (w/w) or less of the concentration of BCG Tokyo. To investigate why this protein is secreted differently, the MPB70 genes of BCG Tokyo and Pasteur were cloned, sequenced and compared. The MPB70 genes in two substrains showed exactly the same sequence. Even the upstream and downstream regions of the MPB70 gene were identical. MPB70 gene expression was assessed by means of Northern hybridization analysis and reverse transcriptase polymerase chain reaction. The mRNA was clearly detected in BCG Tokyo, but at a very low level in BCG Pasteur. On the basis of these results, the difference in the secretion of the MPB70 protein between BCG Tokyo and Pasteur was attributed to differential transcription efficiencies.

Loading

Article metrics loading...

/content/journal/micro/10.1099/13500872-141-7-1601
1995-07-01
2019-11-15
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journal/micro/10.1099/13500872-141-7-1601
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error