Transient activity assays of the Trypanosoma brucei variant surface glycoprotein gene promoter: control of gene expression at the posttranscriptional level.

Abstract:

:The putative promoter of the variant surface glycoprotein (VSG) gene of Trypanosoma brucei was cloned into a plasmid containing the chloramphenicol acetyltransferase (CAT) gene. After electroporation into trypanosomes, this construct directed the expression of the CAT reporter gene. The essential region for promoter activity was found to reside within 88 bp upstream of the putative transcription start site. Transcription of the CAT construct occurred at approximately the same level in both bloodstream and procyclic forms and was resistant to alpha-amanitin. However, CAT expression appeared to be modulated in the two forms of the parasite. Sequences 3' to the gene seemed to be important in this respect, as CAT activity in bloodstream forms was readily detectable only when the 3' region of a VSG cDNA was placed downstream of the CAT gene. Two separate VSG gene promoter sequences, both cloned from T. brucei AnTat 1.3A, were equally able to direct CAT expression, which suggests that there are a number of potential VSG gene promoters in the genome, although usually only one expression site is fully active at any one time.

journal_name

Mol Cell Biol

authors

Jefferies D,Tebabi P,Pays E

doi

10.1128/mcb.11.1.338

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

338-43

issue

1

eissn

0270-7306

issn

1098-5549

journal_volume

11

pub_type

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