Abstract：
:We have been studying the requirement for the aryl hydrocarbon receptor nuclear translocator (Arnt)-dependent DNA complex formation, which precedes the activation of gene transcription. Using DEAE chromatography, we have obtained a Sf9 insect fraction F5 that is highly enriched with beta-tubulin. F5 inhibits the formation of the AhR gel shift complex and this inhibition is sensitive to protease, suggesting that proteins that are present in this F5 fraction are responsible for the inhibition. Additional experiments have revealed that this inhibition is less pronounced in the presence of anti-beta-tubulin IgG and beta-tubulin enriched fraction from pig brain also inhibits the AhR gel shift formation. Sf9 beta-tubulin interacts with Arnt and suppresses the binding of the AhR/Arnt heterodimer to its corresponding enhancer. Human beta4-tubulin, which shares high sequence identity with Sf9 beta-tubulin, suppresses the AhR-dependent luciferase expression by reducing the nuclear Arnt content and retaining Arnt in the cytoplasm. Fluorescence studies using the GFP fusion of human beta4-tubulin have revealed that beta4-tubulin prevents the localization of Arnt in Sf9 cells. Here we have provided evidence suggesting that beta-tubulin may regulate the physiological content of Arnt.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Zhang T,Wang X,Shinn A,Jin J,Chan WKdoi
10.1016/j.bcp.2009.12.010subject
Has Abstractpub_date
2010-04-15 00:00:00pages
1125-33issue
8eissn
0006-2952issn
1873-2968pii
S0006-2952(09)01068-5journal_volume
79pub_type
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