Modulation of BMAL/CLOCK/E-Box complex activity by a CT-rich cis-acting element

May 3, 2006Molecular and cellular endocrinology

Control of BMAL/CLOCK protein complex activity by a DNA element rich in CT sequences

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Abstract

The interaction of a short sequence in the mouse arginine vasopressin (AVP) proximal promoter can enhance BMAL1/CLOCK responsiveness at an adjacent E-Box.

A systematic analysis of the AVP proximal promoter identifies key features and boundaries of the enhancing element.
The effect of photoperiod on the interacting protein(s) of this element is established.
The binding activity of the element may be influenced by Zn2+ in a peripheral oscillator.

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The interaction between the BMAL1/CLOCK transcription factor and the cis-acting element known as the E-Box is a key event in the regulation of clock and clock-controlled gene expression. However, the fact that the ubiquitous E-Box element sits at the center of a presumably highly discriminating control system generates a certain level of puzzlement. Widely spread E-Boxes with a generic sequence CANNTG have been associated with expression of genes involved in a host of disparate biological processes, including the orchestration of circadian physiology. The intriguing specificity of this short DNA consensus element begs the hypothesis that its actual circadian properties might be encoded elsewhere, e.g., other factors or adjacent sequences. In a previous study, we found evidence that a short sequence in the mouse arginine vasopressin (AVP) proximal promoter has the ability to confer robust BMAL1/CLOCK responsiveness onto an adjacent E-Box. Here, we report the systematic analysis of this element. Our findings further define the determining features and sequence boundaries of this element, establish the effect of the photoperiod upon its interacting protein(s), and suggest that its cognate binding activity might be modulated by Zn2+ in a peripheral oscillator.

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Modulation of BMAL/CLOCK/E-Box complex activity by a CT-rich cis-acting element

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