Activation of octamer-containing promoters by either octamer-binding transcription factor 1 (OTF-1) or OTF-2 and requirement of an additional B-cell-specific component for optimal transcription of immunoglobulin promoters.

Molecular and Cellular Biology
A PieraniR G Roeder

Abstract

Several distinct octamer-binding transcription factors (OTFs) interact with the sequence ATTTGCAT (the octamer motif), which acts as a transcription regulatory element for a variety of differentially controlled genes. The ubiquitous OTF-1 plays a role in expression of the cell cycle-regulated histone H2b gene as well as several other genes, while the tissue-specific OTF-2 has been implicated in the tissue-specific expression of immunoglobulin genes. In an attempt to understand the apparent transcriptional selectivity of these factors, we have investigated the physical and functional characteristics of OTF-1 purified from HeLa cells and both OTF-1 and OTF-2 purified from B cells. High-resolution footprinting and mobility shift-competition assays indicated that these factors were virtually indistinguishable in binding affinities and DNA-protein contacts on either the H2b or an immunoglobulin light-chain (kappa) promoter. In addition, each of the purified factors showed an equivalent intrinsic capacity to activate transcription from either immunoglobulin promoters (kappa and heavy chain) or the H2b promoter in OTF-depleted HeLa and B-cell extracts. However, with OTF-depleted HeLa extracts, neither factor could restore immunoglobul...Continue Reading

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