Previous Article | Next Article ![]()
Mol. Cell. Biol., 03 1996, 792-799, Vol 16, No. 3
SL Gregory, RD Kortschak, B Kalionis and R Saint
We reported the identification of a new family of DNA-binding proteins from
our characterization of the dead ringer (dri) gene of Drosophila
melanogaster. We show that dri encodes a nuclear protein that contains a
sequence-specific DNA-binding domain that bears no similarity to known
DNA-binding domains. A number of proteins were found to contain sequences
homologous to this domain. Other proteins containing the conserved motif
include yeast SWI1, two human retinoblastoma binding proteins, and other
mammalian regulatory proteins. A mouse B-cell- specific regulator exhibits
75% identity with DRI over the 137-amino- acid DNA-binding domains of these
proteins, indicating a high degree of conservation of this domain. Gel
retardation and optimal binding site screens revealed that the in vitro
sequence specificity of DRI is strikingly similar to that of many
homeodomain proteins, although the sequence and predicted secondary
structure do not resemble a homeodomain. The early general expression of
dri and the similarity of DRI and homeodomain in vitro DNA-binding
specificity compound the problem of understanding the in vivo specificity
of action of these proteins. Maternally derived dri product is found
throughout the embryo until germ band extension, when dri is expressed in a
developmentally regulated set of tissues, including salivary gland ducts,
parts of the gut, and a subset of neural cells. The discovery of this new,
conserved DNA-binding domain offers an explanation for the regulatory
activity of several important members of this class and predicts
significant regulatory roles for the others.
Copyright © 1996, American Society for Microbiology
Characterization of the dead ringer gene identifies a novel, highly conserved family of sequence-specific DNA-binding proteins
Department of Genetics, University of Adelaide, South Australia.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»