NDLI: The promoter for a variant surface glycoprotein gene expression site in Trypanosoma brucei.

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The promoter for a variant surface glycoprotein gene expression site in Trypanosoma brucei.

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The promoter for a variant surface glycoprotein gene expression site in Trypanosoma brucei.

Content Provider	PubMed Central
Author	Zomerdijk, J. C. Ouellette, M. Ten, Asbroek A. L. Kieft, R. Bommer, A. M. Clayton, C. E. Borst, P.
Abstract	The variant-specific surface glycoprotein (VSG) gene 221 of Trypanosoma brucei is transcribed as part of a 60 kb expression site (ES). We have identified the promoter controlling this multigene transcription unit by the use of 221 chromosome-enriched DNA libraries and VSG gene 221 expression site specific transcripts. The start of transcription was determined by hybridization and RNase protection analysis of nascent RNA. The 5' ends of the major transcripts coming from the initiation region map at nucleotide sequences that do not strongly resemble rRNA transcriptional starts even though the transcripts are synthesized by an RNA polymerase highly resistant to alpha-amanitin. The cloned VSG gene 221 ES transcription initiation region promotes high CAT gene expression, when reintroduced by electroporation into T. brucei. We show that the activity of this expression site is controlled at or near transcription initiation in bloodstream trypanosomes. The 221 ES is inactivated without any sequence alteration within 1.4 kb of the transcription start site. This excludes mechanisms of promoter inactivation involving DNA rearrangements in the vicinity of the transcription start site, e.g. promoter inversion or conversion.
Starting Page	2791
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	9
Volume Number	9
Language	English
Publisher Date	1990-09-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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