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Default Secondary structure of the homeo domain of yeast alpha 2 repressor determined by NMR

Secondary structure of the homeo domain of yeast alpha 2 repressor determined by NMR spectroscopy.

Related Articles Secondary structure of the homeo domain of yeast alpha 2 repressor determined by NMR spectroscopy.

Genes Dev. 1991 May;5(5):764-72

Authors: Phillips CL, Vershon AK, Johnson AD, Dahlquist FW

The yeast alpha 2 protein is a regulator of cell type in Saccharomyces cerevisiae. It represses transcription of a set of target genes by binding to an operator located upstream of each of these genes. The alpha 2 protein shares weak sequence similarity with members of the homeo domain family; the homeo domain is a 60-amino-acid segment found in many eukaryotic transcriptional regulators. In this paper we address the question of whether alpha 2 is structurally related to prototypical members of the homeo domain family. We used solution 1H and 15N nuclear magnetic resonance [NMR] spectroscopy to determine the secondary structure of an 83-amino-acid residue fragment of alpha 2 that contains the homeo domain homology. We have obtained resonance assignments for the backbone protons and nitrogens of the entire 60-residue region of the putative homeo domain and for most of the remainder of the alpha 2 fragment. The secondary structure was determined by using NOE connectivities between backbone protons, 3JHN-H alpha coupling constants, and dynamical information from the hydrogen exchange kinetics of the backbone amides. Three helical segments exist in the alpha 2 fragment consisting of residues 11-23, 32-42, and 46-60 (corresponding to residues 138-150, 159-169, and 173-187 of the intact protein). The positions of these three helices correspond extremely well to those of the Drosophila Antennapedia (Antp) and engrailed (en) homeo domains, whose three-dimensional structures have recently been determined by NMR spectroscopy and X-ray crystallography, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

PMID: 1673952 [PubMed - indexed for MEDLINE]



Source: PubMed
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