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Functional dissection of the mouse Hox-a5 gene
J J Zhao1, R A Lazzarini, L Pick
1Brookdale Center for Molecular Biology, Mount Sinai School of Medicine, New York, NY 10029, USA.
The EMBO Journal
|March 15, 1996
Summary
Mouse Hox-a5 and Drosophila Sex combs reduced (Scr) proteins share functional similarities. The YPWM motif is crucial for biological specificity, potentially through interactions with co-factors like Pbx1.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Hox genes encode DNA-binding proteins critical for establishing positional identity during development.
- Drosophila Sex combs reduced (Scr) and mouse Hox-a5 are conserved Hox proteins that induce similar homeotic transformations in Drosophila embryos.
Purpose of the Study:
- To investigate the functional roles of conserved domains within mouse Hox-a5 by analyzing truncated versions in transgenic Drosophila.
- To determine the contribution of specific protein domains to transcriptional activation and homeotic transformation.
Main Methods:
- Assaying truncated mouse Hox-a5 versions for transcriptional activation in cultured cells.
- Assessing the ability of truncated Hox-a5 to induce homeotic transformation and target gene expression in transgenic Drosophila embryos.
Main Results:
- The homeodomain is essential for Hox protein function and nuclear localization.
- The N-terminal region influences transcriptional activity and transformation potential but not functional specificity.
- The YPWM motif is critical for biological specificity and likely mediates interactions with co-factors like Pbx1, but not transcriptional activation.
Conclusions:
- The YPWM motif's role in protein-protein interactions, such as with Pbx1, is essential for the biological activities of Hox-a5 and Scr.
- Conserved domains within Hox proteins contribute differentially to their function, with the YPWM motif playing a key role in specificity.