PMID: 2107543Mar 1, 1990Paper

The trithorax gene, a trans-acting regulator of the bithorax complex in Drosophila, encodes a protein with zinc-binding domains

Proceedings of the National Academy of Sciences of the United States of America
A MazoIgor Dawid

Abstract

The trithorax (trx) gene functions in segment determination in Drosophila through interaction with genes of the bithorax complex and Antennapedia complex. Genetic evidence suggests that trx may be considered a positive regulator of homeotic genes. Sequencing of cDNAs corresponding to the entire trx transcription unit revealed the existence of an unusually long open reading frame encoding 3759 amino acids. The main features of the predicted trx protein are several cysteine-rich regions which can be folded into zinc finger-like domains. Cysteine-rich portions expressed from trx cDNAs in Escherichia coli are capable of zinc binding in vitro, suggesting a possible function for the trx product as a metal-dependent DNA-binding protein. Analysis of trx mutant embryos with antibody to the Ultrabithorax (Ubx) gene product showed decreased staining in parasegment 6 of the ventral nerve cord of late embryos. However, expression of Ubx was not affected in embryos carrying the lethal mutation trxE3, in which one of the putative zinc finger-like domains of the trx protein is deleted. This differential effect of the E3 mutation suggests that trx exhibits other function(s) besides those involved in the regulation of Ubx expression in the ventr...Continue Reading

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Citations

Jun 1, 1995·Genes, Chromosomes & Cancer·O A Bernard, R Berger
Jul 1, 1995·Mammalian Genome : Official Journal of the International Mammalian Genome Society·R N Haire, G W Litman
Mar 23, 2012·Journal of Plant Research·María del Pilar Valencia-MoralesRaúl Alvarez-Venegas
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